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Alfonso Cuarón
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Alfonso Cuarón Orozco ( ; ; born 28 November 1961) is a Mexican filmmaker. His accolades include four Academy Awards, three Golden Globe Awards and seven BAFTA Awards.
Cuarón made his feature film debut with the romantic comedy "Sólo con tu pareja" (1991), and directed the film adaptations "A Little Princess" (1995), and "Great Expectations" (1998). His breakthrough came with the coming-of-age film "Y tu mamá también" (2001) which earned him a nomination for the Academy Award for Best Original Screenplay. He gained greater prominence for directing the fantasy film "Harry Potter and the Prisoner of Azkaban" (2004), the dystopian drama "Children of Men" (2006), the science fiction drama "Gravity" (2013), and the semi-autobiographical drama "Roma" (2018). The latter two won him Academy Awards for Best Director. He also won Best Film Editing for "Gravity" and Best Cinematography for "Roma".
Early life and education.
Cuarón was born in Mexico City, the son of Alfredo Cuarón, a doctor specializing in nuclear medicine, and Cristina Orozco, a pharmaceutical biochemist. He has a sister Christina, and two brothers; Carlos, also a filmmaker, and Alfredo, a conservation biologist. Cuarón studied philosophy at the National Autonomous University of Mexico and filmmaking at the Centro Universitario de Estudios Cinematográficos, a school within the same university. There he met the director Carlos Marcovich and cinematographer Emmanuel Lubezki, and they made what would be his first short film, "Vengeance Is Mine".
Career.
1990–1999: Rise to prominence.
Cuarón began working on television in Mexico, first as a technician and then as a director. His television work led to assignments as an assistant director for several film productions including "La Gran Fiesta" (1985), "" (1987) and "Romero" (1989). In 1991 he landed his first big-screen directorial assignment, "Sólo con tu pareja", a sex comedy about a womanizing businessman (played by Daniel Giménez Cacho) who, after having sex with an attractive nurse, is fooled into believing he's contracted AIDS. In addition to writing, producing and directing, Cuarón co-edited the film with Luis Patlán. The film, which also starred cabaret singer Astrid Hadad and model/actress Claudia Ramírez (with whom Cuarón was linked between 1989 and 1993) was a big hit in Mexico. After this success, director Sydney Pollack hired Cuarón to direct an episode of "Fallen Angels", a series of neo-noir stories produced for the Showtime premium cable network in 1993; other directors who worked on the series included Steven Soderbergh, Jonathan Kaplan, Peter Bogdanovich, and Tom Hanks. The episode was entitled, "Murder, Obliquely" (1993) starring Laura Dern, Alan Rickman, and Diane Lane.
In 1995, Cuarón released his first feature film produced in the United States, "A Little Princess", an adaptation of Frances Hodgson Burnett's classic 1905 novel of the same name. The film received critical acclaim with Janet Maslin of "The New York Times" declaring, "[the film] is a bright, beautiful and enchantingly childlike vision", one that "draw[s] its audience into the wittily heightened reality of a fairy tale" and "takes enough liberties to re-invent rather than embalm Miss Burnett's assiduously beloved story". The film went on to receive two Academy Award nominations for Best Cinematography and Best Production Design. Cuarón's next feature was also a literary adaptation, a modernized version of Charles Dickens's "Great Expectations" starring Ethan Hawke, Gwyneth Paltrow, and Robert De Niro. The film received mixed reviews to negative reviews. Russell Smith of "The Austin Chronicle" did however praise the film writing, ". What's truly intriguing about this film, though, is the stylishness with which Cuaron (A Little Princess) reinvents Dickens' hoary, often-remade tale. This "Great Expectations" has a seductive, enchanting feel that has nothing to do with sweet, gauzy sentiments or calculatedly “magical” Hollywood imagery".
2000–2009: Career breakthrough and success.
In 2001, Cuarón found himself returning to Mexico with a Spanish-speaking cast to film "Y tu mamá también", starring Gael García Bernal, Diego Luna and Maribel Verdú. It was a provocative and controversial road comedy about two sexually obsessed teenagers who take an extended road trip with an attractive married woman who is much older than they. The film's open portrayal of sexuality and frequent rude humor, as well as the politically and socially relevant asides, made the film an international hit and a major success with critics. The film was distributed through IFC in America allowing the film to collect $13.8 million in the United States, unparalleled at the time for Latin American films. Critic Roger Ebert of "The Chicago Sun-Times" wrote, "It is clear Cuaron is a gifted director, and here he does his best work to date." Cuarón shared an Academy Award nomination for Best Original Screenplay with co-writer and brother Carlos Cuarón.
In 2004, Cuarón directed the third film in the successful "Harry Potter" series, "Harry Potter and the Prisoner of Azkaban". Cuarón faced criticism at the time from some "Harry Potter" fans for his approach to the film, notably its tendency to take more creative liberties with the source material than its predecessors. However, author J. K. Rowling, who had seen and loved Cuarón's film "Y tu mamá también", said that it was her personal favorite from the series so far. Critically, the film was also better received than the first two installments, with some critics remarking its new tone and for being the first "Harry Potter" film to truly capture the essence of the novels. It has been subsequently rated by audience polls and critics as the best of the movie franchise series. The film earned two Academy Award nominations for Best Visual Effects and Best Original Score for John Williams.
In 2006, Cuarón's feature "Children of Men", an adaptation of the P. D. James novel starring Clive Owen, Julianne Moore, and Michael Caine, received wide critical acclaim including three Academy Award nominations. Cuarón himself received two nominations for his work on the film, in Best Film Editing (with Alex Rodríguez) and Best Adapted Screenplay (with several collaborators).
He created the production and distribution company Esperanto Filmoj ("Esperanto Films", named because of his support for the international language Esperanto), which has credits in the films "Duck Season", "Pan's Labyrinth", and "Gravity". He was also a co-founder of the production company, the "Tequila Gang" together with filmmaker Guillermo del Toro, screenwriter Laura Esquivel, producer Berta Navarro and sales agent Rosa Bosch.
Cuarón directed the controversial public service announcement "I Am Autism" (2009) for Autism Speaks that was criticized by disability rights groups for its negative portrayal of autism.
2010–present: Awards recognition.
In 2010, Cuarón began to develop the film "Gravity", a drama set in space. He was joined by producer David Heyman, with whom Cuarón worked on "Harry Potter and the Prisoner of Azkaban". Starring Sandra Bullock and George Clooney, the film opened the 70th Venice International Film Festival in August. The film was then released in America in October 2013. The film became a financial success, earning 723.2 million at the box office against a budget of 130 million. The film also received many awards nominations. For the film, he received the Golden Globe Award in the category of Best Director. The film received ten Academy Award nominations, including Best Picture and Best Director. Cuarón won for Best Directing, becoming the first Latin American to win the award, while he and Mark Sanger received the award for Best Film Editing.
In 2013, Cuarón created "Believe", a science fiction/fantasy/adventure series that was broadcast as part of the 2013–14 United States network television schedule on NBC as a mid-season entry. The series was created by Cuarón for Bad Robot and Warner Bros. Television. In 2014, "Time" placed him in its list of "100 Most Influential People in the World" – Pioneers.
In May 2015, Cuarón was announced as the president of the jury for the 72nd Venice International Film Festival.
Production began in fall 2016 for Cuarón's eighth film, "Roma", a tale of a housekeeper for a middle class Mexican family in 1970s Mexico City, based on the life of his family's longtime maid, Liboria Rodríguez. The project was produced by Cuarón, Gabriela Rodríguez and Nicolás Celis and starred Yalitza Aparicio and Marina de Tavira both of whom received Oscar nominations. The film debuted at the 75th Venice International Film Festival, where it won the Golden Lion, and was distributed to select Mexican and American theaters before its online release on Netflix. "Roma" was highly acclaimed upon release; among its accolades are two Golden Globes (Golden Globe Award for Best Foreign Language Film and Best Director for Cuarón) and three Academy Awards (Best Director, Best Foreign Language Film, and Best Cinematography for Cuarón) out of a leading ten nominations.
In 2019, Cuaron signed an overall TV deal at Apple. His first series for Apple was the psychological thriller "Disclaimer", starring Cate Blanchett, Kevin Kline, Louis Partridge and Sasha Baron Cohen; it is based on the eponymous novel by Renée Knight, with Cuaron writing and directing every episode.
Style and themes.
Cuaron's style is a mix of several mainstream Hollywood conventions while breaking from that dominant influence by taking an unorthodox approach that uses voiceover narration and by unconventionally lengthy shots. These longer cuts, narration, and often, moving cameras are more typical of documentary film.
In his first feature film the average shot length is around six seconds, and ten years later for "Y Tu Mama Tambien" the average increased to 19.6 seconds. "The Prisoner of Azkaban" had an average of seconds, while the subsequent "Children of Men" had an extraordinary average of 16 seconds between cuts. A typical Hollywood movie cuts every two seconds. Cuarón's career shows mainstream Hollywood influences, which has spilled over to less mainstream films made outside of Hollywood. "Children of Men" was influenced by disaster and science fiction movie conventions. "The Prisoner of Azkaban" was a continuation of Cuarón's take on the coming-of-age genre after "Y, Tu Mama Tambien". That film is in the form of an American road movie, along with teen movie elements. Voice-over narration adds a documentary feel. The narration, interjected by a non-diagetic voice not belonging to any character, highlights the socioeconomic state of not only the main characters, but also minor characters who otherwise seem irrelevant to the overall narrative.
As mentioned above, the voice-over narration in "Y Tu Mama Tambien" contains political messages. In the aforementioned film Cuarón tackles Mexican identity and sovereignty. With the backdrop of the 1990s and the advent of NAFTA and neoliberalism in Mexico, Cuarón critiques Mexico for the path they are heading towards a globalized economy and world. Cuarón also addresses Mexican history such as colonialism and the long unfulfilled promises of the Mexican Revolution of 1910. Using the same film as an example the narrator states that a new political party is in power, but hints that no real change will come about. This is also supported with one of the main characters, Julio, sharing a last name with the Mexican Revolutionary Emiliano Zapata, yet the name does not push Julio into action or in other words he lacks the initiative and interest in the country. These same themes of identity and history, particularly of Mexico, were first addressed in his first feature film "Solo con tu pareja". In both films Cuarón uses allegory that ties into a national identity and/or history. On top of these themes he also tackles class, but that can be considered a subcategory of economics or politics in which he already grapples with.
Personal life.
Cuarón's first marriage was to Mariana Elizondo with whom he has a son, Jonás Cuarón, born in 1981. Jonás is also a film director, known for "Year of the Nail" and "Desierto". Alfonso's second marriage, from 2001 to 2008, was to Italian actress and freelance journalist Annalisa Bugliani, with whom he has two children.
He has publicly shown his fascination for the Esperanto language and his support for the Esperanto movement. He called his production company Esperanto Filmoj. In October 2023, Cuarón signed an open letter from artists to US President Joe Biden calling for a ceasefire of Israeli bombardment in Gaza.
Cuarón is a vegetarian and has been living in London since 2000.
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Arianism
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Arianism (, ) is a Christological doctrine which rejects the traditional notion of the Trinity and considers Jesus to be a creation of God, and therefore distinct from God. It is named after its major proponent, Arius (). It is considered heretical by most modern mainstream branches of Christianity. It is held by a minority of modern denominations, although some of these denominations hold related doctrines such as Socinianism, and some shy away from use of the term Arian due to the term's historically negative connotations. Modern denominations sometimes connected to the teaching include Jehovah's Witnesses, some individual churches within the Churches of Christ (including the movement's founder Barton W. Stone), as well as some Hebrew Roots Christians and Messianic Jews (although many Messianic Jews also follow Nicene Christianity).
It is first attributed to Arius (), a Christian presbyter who preached and studied in Alexandria, Egypt, although it developed out of various pre-existing strands of Christianity which differed from later Nicene Christianity in their view of Christology. Arian theology holds that Jesus Christ is the Son of God, who was begotten by God the Father with the difference that the Son of God did not always exist but was begotten/made before time by God the Father; therefore, Jesus was not coeternal with God the Father, but nonetheless Jesus began to exist outside time.
Arius' trinitarian theology, later given an extreme form by Aetius and his disciple Eunomius and called anomoean ('dissimilar'), asserts a total dissimilarity between the Son and the Father. Arianism holds that the Son is distinct from the Father and therefore subordinate to him. The term "Arian" is derived from the name Arius; it was not what the followers of Arius' teachings called themselves, but rather a term used by outsiders. The nature of Arius's and his supporters' teachings were opposed to the theological doctrines held by Homoousian Christians regarding the nature of the Trinity and the nature of Christ. Homoousianism and Arianism were contending interpretations of Jesus's divinity, both based upon the trinitarian theological orthodoxy of the time.
Homoousianism was formally affirmed by the first two ecumenical councils; since then, Arianism has been condemned as "the heresy or sect of Arius". Trinitarian (Homoousian) doctrines were vigorously upheld by Patriarch Athanasius of Alexandria, who insisted that Jesus (God the Son) was "same in being" or "same in essence" with God the Father. Arius dissented: "If the Father begat the Son, then he who was begotten had a beginning in existence, and from this it follows there was a time when the Son was not." The ecumenical First Council of Nicaea of 325 declared Arianism to be a heresy. According to Everett Ferguson, "The great majority of Christians had no clear views about the nature of the Trinity and they did not understand what was at stake in the issues that surrounded it."
Arianism is also used to refer to other nontrinitarian theological systems of the 4th century, which regarded Jesus Christ—the Son of God, the Logos—as either a begotten creature of a similar or different substance to that of the Father, but not identical (as Homoiousian and Anomoeanism) or as neither uncreated nor created in the sense other beings are created (as in semi-Arianism).
Origin.
Some early Christians whose beliefs would have fallen under 'orthodoxy' in the third and fourth centuries denied the eternal generation of the Son; they viewed the Son as having been begotten in time. These include Tertullian and Justin Martyr. Tertullian is considered a pre-Arian. Among the other church fathers, Origen was accused of Arianism for using terms like "second God", and Patriarch Dionysius of Alexandria was denounced at Rome for saying that Son is a work and creature of God (i.e., a created being). However, the subordinationism of Origen is not identical to Arianism, and it has been generally viewed as closer to the Nicene-Constantinopolitan view of the Trinity.
Controversy over Arianism arose in the late 3rd century and persisted throughout most of the 4th century. It involved most church members—from simple believers, priests, and monks to bishops, emperors, and members of Rome's imperial family. Two Roman emperors, Constantius II and Valens, became Arians or semi-Arians, as did prominent Gothic, Vandal, and Lombard warlords both before and after the fall of the Western Roman Empire. The antipopes Felix II and Ursinus were Arian, and Pope Liberius was forced to sign the Arian Creed of Sirmium of 357—though the letter says he willingly agreed with Arianism. Such a deep controversy within the early Church during this period could not have materialized without significant historical influences providing a basis for the Arian doctrines.
Arius had been a pupil of Lucian of Antioch at Lucian's private academy in Antioch and inherited from him a modified form of the teachings of Paul of Samosata. Arius taught that God the Father and the Son of God did not always exist together eternally.
Beliefs.
Little of Arius's own work survives except in quotations selected for polemical purposes by his opponents, and there is no certainty about what theological and philosophical traditions formed his thought. The influence from the One of Neoplatonism was widespread throughout the Eastern Roman Empire, and this influenced Arius.
Arius's basic premise is that only God is independent of existing. Since the Son is dependent, he must, therefore, be called a creature. Arians put forward a question for their belief: "Has God birthed Jesus willingly or unwillingly?" This question was used to argue that Jesus is dependent for his existence since Jesus exists only because God wants him to be.
Arianism taught that the "Logos" was a divine being created by God the Father before the world's creation, serving as the medium for creation, and that the Son of God is subordinate to the Father. The concept of the "Logos" refers to an inner attribute of God associated with wisdom. Jesus is identified as the "Logos" due to a supposed resemblance to this inner aspect of God's nature.
A verse from Proverbs was used that, according to Arianism, spoke of the creation of the Son by God: "The Lord created me at the beginning of his work." Therefore, they posited, the Son was rather the very first and the most perfect of God's creatures, and he was called "God" only by the Father's permission and power. The term "Son" is ambiguous, as Arians use adoptionist theology to support the belief that Jesus was created "ex nihilo" by the Father.
Arians do not believe in the traditional doctrine of the Trinity. The letter of the Arian bishop Auxentius of Durostorum regarding the Arian missionary Ulfilas (–383) gives an overview of Arian beliefs. Ulfilas, ordained by Arian bishop Eusebius of Nicomedia, became a missionary to the Goths and believed that God the Father, the "unbegotten" Almighty, is the only true God. According to Auxentius, Ulfilas believed the Son of God, Jesus, the "only-begotten god", was begotten before time began. The Holy Spirit, he wrote, is the illuminating and sanctifying power of God. Using 1 Corinthians 8:5–6 as a proof text:
The creed of Ulfilas, which concludes the letter mentioned above, distinguishes God the Father ("unbegotten"), who is the only true God, from the Son of God ("only-begotten") and the Holy Spirit, the illuminating and sanctifying power, which is neither God the Father nor the God the Son:
A letter from Arius to the Arian Eusebius of Nicomedia (died 341) states the core beliefs of the Arians:
Principally, the dispute between Trinitarianism and Arianism was about two questions:
For Constantine, these were minor theological points that stood in the way of uniting the Empire, but for the theologians, it was of huge importance; for them, it was a matter of salvation.
For the theologians of the 19th century, it was already obvious that, in fact, Arius and Alexander/Athanasius did not have much to quarrel about; the difference between their views was very small, and the end of the fight was by no means clear during their quarrel, both Arius and Athanasius suffering a great deal for their own views. Arius was the father of Homoiousianism, and Alexander was the father of Homoousianism, which Athanasius championed. For those theologians, it was clear that Arius, Alexander, and Athanasius were far from a true doctrine of the Trinity, which developed later, historically speaking.
Guido M. Berndt and Roland Steinacher state clearly that the beliefs of Arius were acceptable ("not especially unusual") to a huge number of orthodox clergy; this is the reason why such a major conflict was able to develop inside the Church since Arius's theology received widespread sympathy (or at least was not considered to be overly controversial) and could not be dismissed outright as individual heresy.
Homoian Arianism.
Arianism had several different variants, including Eunomianism and Homoian Arianism. Homoian Arianism is associated with Acacius and Eudoxius. Homoian Arianism avoided the use of the word "ousia" to describe the relation of Father to Son, and described these as "like" each other. Hanson lists twelve creeds that reflect the Homoian faith:
Struggles with orthodoxy.
First Council of Nicaea.
In 321, Arius was denounced by a synod at Alexandria for teaching a heterodox view of the relationship of Jesus to God the Father. Because Arius and his followers had great influence in the schools of Alexandria—counterparts to modern universities or seminaries—their theological views spread, especially in the eastern Mediterranean.
By 325, the controversy had become significant enough that the Emperor Constantine called an assembly of bishops, the First Council of Nicaea, which condemned Arius's doctrine and formulated the original Nicene Creed of 325. The Nicene Creed's central term, used to describe the relationship between the Father and the Son, is Homoousios (), or Consubstantiality, meaning "of the same substance" or "of one being". The Athanasian Creed is less often used but is a more overtly anti-Arian statement on the Trinity.
The focus of the Council of Nicaea was the nature of the Son of God and his precise relationship to God the Father. (See Paul of Samosata and the Synods of Antioch.) Arius taught that Jesus Christ was divine or holy and was sent to Earth for the salvation of mankind, but that Jesus Christ was not equal to God the Father (infinite, primordial origin) in rank, and that God the Father and the Son of God were not equal to the Holy Spirit. Under Arianism, Christ was instead not consubstantial with God the Father since both the Father and the Son under Arius were made of "like" essence or being (see homoiousia) but not of the same essence or being (see homoousia).
In the Arian view, God the Father is a deity and is divine; the Son of God is not a deity, but is still divine. God the Father sent Jesus to earth for salvation of mankind. Ousia is essence or being, in Eastern Christianity, and is the aspect of God that is completely incomprehensible to mankind and human perception. It is all that subsists by itself and which has not its being in another, God the Father and God the Son and God the Holy Spirit all being uncreated.
According to the teaching of Arius, the preexistent Logos and thus the incarnate Jesus Christ was a begotten being; only the Son was directly begotten by God the Father, before ages, but was of a distinct, though similar, essence or substance from the Creator. His opponents argued that this would make Jesus less than God and that this was heretical. Much of the distinction between the differing factions was over the phrasing that Christ expressed in the New Testament to express submission to God the Father. The theological term for this submission is kenosis. This ecumenical council declared that Jesus Christ was true God, co-eternal and consubstantial (i.e., of the same substance) with God the Father.
Constantine is believed to have exiled those who refused to accept the Nicaean Creed—Arius himself, the deacon Euzoios, and the Libyan bishops Theonas of Marmarica and Secundus of Ptolemais, along with the bishops who signed the creed but refused to join in condemnation of Arius, Eusebius of Nicomedia and Theognis of Nicaea. The emperor also ordered all copies of the "Thalia", the book in which Arius had expressed his teachings, to be burned. However, there is no evidence that his son and ultimate successor, Constantius II, a Semi-Arian Christian, was exiled.
Although he was committed to maintaining what the Great Church had defined at Nicaea, Constantine was also bent on pacifying the situation and eventually became more lenient toward those condemned and exiled at the council. First, he allowed Eusebius of Nicomedia, who was a protégé of his sister, and Theognis to return once they had signed an ambiguous statement of faith. The two, and other friends of Arius, worked for Arius's rehabilitation.
At the First Synod of Tyre in AD 335, they brought accusations against Athanasius, now bishop of Alexandria, the primary opponent of Arius. After this, Constantine had Athanasius banished since he considered him an impediment to reconciliation. In the same year, the Synod of Jerusalem under Constantine's direction readmitted Arius to communion in 336. Arius died on the way to this event in Constantinople. Some scholars suggest that Arius may have been poisoned by his opponents. Eusebius and Theognis remained in the Emperor's favor; when Constantine -who had been a catechumen much of his adult life- accepted baptism on his deathbed, it was from Eusebius of Nicomedia.
Condemnation by the Council of Nicaea.
Emperor Constantine the Great summoned the First Council of Nicaea, which defined the dogmatic fundaments of Christianity; these definitions served to rebut the questions posed by Arians. Since Arius was not a bishop, he was not allowed to sit on the council, and it was Eusebius of Nicomedia who spoke for him and the position he represented. All the bishops who were there were in agreement with the major theological points of the proto-orthodoxy, since at that time all other forms of Christianity "had by this time already been displaced, suppressed, reformed, or destroyed".
Although the proto-orthodox won the previous disputes, due to the more precise defining of orthodoxy, they were vanquished with their own weapons, ultimately being declared heretics, not because they would have fought against ideas regarded as theologically correct, but because their positions lacked the precision and refinement needed by the fusion of several contradictory theses accepted at the same time by later orthodox theologians.
Of the roughly 300 bishops in attendance at the Council of Nicaea, two bishops did not sign the Nicene Creed that condemned Arianism. Constantine the Great also ordered a penalty of death for those who refused to surrender the Arian writings:
Ten years after the Council of Nicaea, Constantine the Great, who was himself later baptized by the Arian bishop Eusebius of Nicomedia in 337 AD, convened another gathering of church leaders at the regional First Synod of Tyre in 335, attended by 310 bishops, to address various charges mounted against Athanasius by his detractors, such as "murder, illegal taxation, sorcery, and treason", following his refusal to readmit Arius into fellowship. Athanasius was exiled to Trier (in modern Germany) following his conviction at Tyre of conspiracy, and Arius was, effectively, exonerated.
Athanasius eventually returned to Alexandria in 346, after the deaths of both Arius and Constantine. Though Arianism had spread, Athanasius and other Nicene Christian church leaders crusaded against Arian theology, and Arius was anathemised and condemned as a heretic once more at the ecumenical First Council of Constantinople of 381, attended by 150 bishops. The Roman Emperors Constantius II (337–361) and Valens (364–378) were Arians or Semi-Arians, as was the first King of Italy, Odoacer (433?–493), and the Lombards were also Arians or Semi-Arians until the 7th century. The ruling elite of Visigothic Spain was Arian until 589. Many Goths adopted Arian beliefs upon their conversion to Christianity. The Vandals actively spread Arianism in North Africa.
Aftermath of Nicaea.
The First Council of Nicaea did not end the controversy, as many bishops of the Eastern provinces disputed the "homoousios", the central term of the Nicene Creed, as it had been used by Paul of Samosata, who had advocated a monarchianist Christology. Both the man and his teaching, including the term "homoousios", had been condemned by the Synods of Antioch in 269.
Hence, after Constantine's death in 337, open dispute resumed again. Constantine's son Constantius II, who had become emperor of the eastern part of the Roman Empire, actually encouraged the Arians and set out to reverse the Nicene Creed. His advisor in these affairs was Eusebius of Nicomedia, who had already at the Council of Nicaea been the head of the Arian party, and was made the bishop of Constantinople.
Constantius used his power to exile bishops adhering to the Nicene Creed, especially St Athanasius of Alexandria, who fled to Rome. In 355 Constantius became the sole Roman emperor and extended his pro-Arian policy toward the western provinces, frequently using force to push through his creed, even exiling Pope Liberius and installing Antipope Felix II.
The Third Council of Sirmium in 357 was the high point of Arianism. The Seventh Arian Confession (Second Sirmium Confession) held that both "homoousios" (of one substance) and "homoiousios" (of similar substance) were unbiblical and that the Father is greater than the Son. This confession was later known as the Blasphemy of Sirmium.
But since many persons are disturbed by questions concerning what is called in Latin "substantia", but in Greek "ousia", that is, to make it understood more exactly, as to 'coessential,' or what is called, 'like-in-essence,' there ought to be no mention of any of these at all, nor exposition of them in the Church, for this reason and for this consideration, that in divine Scripture nothing is written about them, and that they are above men's knowledge and above men's understanding;
As debates raged in an attempt to come up with a new formula, three camps evolved among the opponents of the Nicene Creed. The first group mainly opposed the Nicene terminology and preferred the term "homoiousios" (alike in substance) to the Nicene "homoousios", while they rejected Arius and his teaching and accepted the equality and co-eternality of the persons of the Trinity. Because of this centrist position, and despite their rejection of Arius, they were called "Semi-Arians" by their opponents.
The second group also avoided invoking the name of Arius, but in large part followed Arius's teachings and, in another attempted compromise wording, described the Son as being like ("homoios") the Father. A third group explicitly called upon Arius and described the Son as unlike ("anhomoios") the Father. Constantius wavered in his support between the first and the second party, while harshly persecuting the third.
Epiphanius of Salamis labeled the party of Basil of Ancyra in 358 "Semi-Arianism". This is considered unfair by Kelly who states that some members of the group were virtually orthodox from the start but disliked the adjective "homoousios" while others had moved in that direction after the out-and-out Arians had come into the open.
The debates among these groups resulted in numerous synods, among them the Council of Serdica in 343, the Fourth Council of Sirmium in 358 and the double Council of Rimini and Seleucia in 359, and no fewer than fourteen further creed formulas between 340 and 360. This lead the pagan observer Ammianus Marcellinus to comment sarcastically: "The highways were covered with galloping bishops." None of these attempts was acceptable to the defenders of Nicene orthodoxy. Writing about the latter councils, Saint Jerome remarked that the world "awoke with a groan to find itself Arian."
After Constantius's death in 361, his successor Julian, a devotee of Rome's pagan gods, declared that he would no longer attempt to favor one church faction over another, and allowed all exiled bishops to return. This increased dissension among Nicene Christians. The emperor Valens, however, revived Constantius's policy and supported the "Homoian" party, exiling bishops and often using force. During this persecution many bishops were exiled to the other ends of the Roman Empire, e.g., Saint Hilary of Poitiers to the eastern provinces. These contacts and their common plight led to a rapprochement between the western supporters of the Nicene Creed and the "homoousios" and the eastern Semi-Arians.
Council of Constantinople.
It was not until the co-reigns of Gratian and Theodosius that Arianism was effectively wiped out among the ruling class and elite of the Eastern Empire. Valens died in the Battle of Adrianople in 378 and was succeeded by Theodosius I, who adhered to the Nicene Creed. This allowed for settling the dispute. Theodosius's wife St Flacilla was instrumental in his campaign to end Arianism.
Two days after Theodosius arrived in Constantinople, 24 November 380, he expelled the Arian bishop, Demophilus of Constantinople, and surrendered the churches of that city to Gregory of Nazianzus, the Homoiousian leader of the rather small Nicene community there, an act which provoked rioting. Theodosius had just been baptized, by bishop Acholius of Thessalonica, during a severe illness, as was common in the early Christian world. In February he and Gratian had published an edict that all their subjects should profess the faith of the bishops of Rome and Alexandria (i.e., the Nicene faith), or be handed over for punishment for not doing so.
Although much of the church hierarchy in the East had opposed the Nicene Creed in the decades leading up to Theodosius's accession, he managed to achieve unity on the basis of the Nicene Creed. In 381, at the Second Ecumenical Council in Constantinople, a group of mainly Eastern bishops assembled and accepted the Nicene Creed of 381, which was supplemented in regard to the Holy Spirit, as well as some other changes: see Comparison of Nicene Creeds of 325 and 381. This is generally considered the end of the dispute about the Trinity and the end of Arianism among the Roman, non-Germanic peoples.
Among medieval Germanic tribes.
During the time of Arianism's flowering in Constantinople, the Gothic convert and Arian bishop Ulfilas (later the subject of the letter of Auxentius cited above) was sent as a missionary to the Gothic tribes across the Danube, a mission favored for political reasons by the Emperor Constantius II. The Homoians in the Danubian provinces played a major role in the conversion of the Goths to Arianism.
Ulfilas's translation of the Bible into Gothic language and his initial success in converting the Goths to Arianism was strengthened by later events. The conversion of Goths led to a widespread diffusion of Arianism among other Germanic tribes as well, the Vandals, Langobards, Svevi, and Burgundians. When the Germanic peoples entered the provinces of the Western Roman Empire and began founding their own kingdoms there, most of them were Arian Christians.
The conflict in the 4th century had seen Arian and Nicene factions struggling for control of Western Europe. In contrast, among the Arian German kingdoms established in the collapsing Western Empire in the 5th century, there existed entirely separate Arian and Nicene Churches with parallel hierarchies, each serving different sets of believers. The Germanic elites were Arians, and the Romance-majority population was Nicene.
The Arian Germanic tribes were generally tolerant towards Nicene Christians and other religious minorities, including the Jews.
The apparent resurgence of Arianism after Nicaea was more an anti-Nicene reaction exploited by Arian sympathizers than a pro-Arian development. By the end of the 4th century, it had surrendered its remaining ground to Trinitarianism. In Western Europe, Arianism, which had been taught by Ulfilas, the Arian missionary to the Germanic tribes, was dominant among the Goths, Langobards and Vandals. By the 8th century, it had ceased to be the tribes' mainstream belief as the tribal rulers gradually came to adopt Nicene orthodoxy. This trend began in 496 with Clovis I of the Franks, then Reccared I of the Visigoths in 587 and Aripert I of the Lombards in 653.
The Franks and the Anglo-Saxons were unlike the other Germanic peoples in that they entered the Western Roman Empire as Pagans and were converted to Chalcedonian Christianity, led by their kings, Clovis I of the Franks, and Æthelberht of Kent and others in Britain. See also Christianity in Gaul and Christianisation of Anglo-Saxon England.
The remaining tribes – the Vandals and the Ostrogoths – did not convert as a people nor did they maintain territorial cohesion. Having been militarily defeated by the armies of Emperor Justinian I, the remnants were dispersed to the fringes of the empire and became lost to history. The Vandalic War of 533–534 dispersed the defeated Vandals. Following their final defeat at the Battle of Mons Lactarius in 553, the Ostrogoths went back north and re-settled in south Austria.
From the 5th to the 7th century.
Much of south-eastern Europe and central Europe, including many of the Goths and Vandals respectively, had embraced Arianism (the Visigoths converted to Arian Christianity in 376 through their bishop Wulfila), which led to Arianism being a religious factor in various wars in the Roman Empire.
In the west, organized Arianism survived in North Africa, in Hispania, and parts of Italy until it was suppressed in the 6th and 7th centuries. Visigothic Spain converted to Nicene Christianity through their king Reccared I at the Third Council of Toledo in 589. Grimoald, King of the Lombards (662–671), and his young son and successor Garibald (671), were the last Arian kings in Europe.
From the 16th to the 19th century.
Following the Protestant Reformation from 1517, it did not take long for Arian and other nontrinitarian views to resurface. The first recorded English antitrinitarian was John Assheton, who was forced to recant before Thomas Cranmer in 1548. At the Anabaptist Council of Venice 1550, the early Italian instigators of the Radical Reformation committed to the views of Michael Servetus,—who was burned alive by the orders of John Calvin in 1553—were promulgated by Giorgio Biandrata and others into Poland and Transylvania.
The anti trinitarian wing of the Polish Reformation separated from the Calvinist "ecclesia maior" to form the "ecclesia minor" or Polish Brethren. These were commonly referred to as "Arians" due to their rejection of the Trinity, though in fact the Socinians, as they were later known, went further than Arius to the position of Photinus. The epithet "Arian" was also applied to the early Unitarians such as John Biddle; though in denial of the pre-existence of Christ they were again largely Socinians, not Arians.
In 1683, when Anthony Ashley Cooper, 1st Earl of Shaftesbury, lay dying in Amsterdam—driven into exile by his outspoken opposition to King Charles II—he spoke to the minister Robert Ferguson, and professed himself an Arian.
In the 18th century the "dominant trend" in Britain, particularly in Latitudinarianism, was toward Arianism, with which Samuel Clarke, Benjamin Hoadly, William Whiston and Isaac Newton are associated. To quote the "Encyclopædia Britannica" article on Arianism: "In modern times some Unitarians are virtually Arians in that they are unwilling either to reduce Christ to a mere human being or to attribute to him a divine nature identical with that of the Father."
Today.
The teachings of the first two ecumenical councils that entirely reject Arianism include: the Catholic Church, the Eastern Orthodox Church, the Oriental Orthodox Churches, the Assyrian Church of the East; almost all historic Protestant churches including Lutheran, Reformed, Presbyterian, Continental Reformed, Congregationalist, Anglican, Methodist, Baptist, and Free Evangelical; all entirely reject the teachings associated with Arianism.
Modern groups that currently appear to embrace some of the principles of Arianism include Unitarians and Jehovah's Witnesses. Although the origins of their beliefs are not necessarily attributed to the teachings of Arius, many of the core beliefs of Unitarians and Jehovah's Witnesses are very similar to them.
Jehovah's Witnesses.
Jehovah's Witnesses are often referred to as "modern-day Arians", usually by their opponents, although Jehovah's Witnesses themselves have denied these claims. Significant similarities in doctrine include the identification of the Father as the only true God and of Jesus Christ as the first creation of God and the intermediate agent in the creation of all other things. They also deny the personhood of the Holy Spirit, which some Arians historically affirmed. Jehovah's Witnesses exclusively worship and pray to God the Father, or Jehovah, only through Jesus (the Son) as a mediator.
Iglesia ni Cristo.
Iglesia ni Cristo's Christology has parallels with Arianism in that it affirms that the Father is the only true God, but it denies the preexistence of Christ. Thus, Iglesia ni Cristo is Socinian rather than Arian in its Christology.
Other Socinian groups.
Other Biblical Unitarians such as the Christadelphians and Church of God General Conference are also typically Socinian rather than Arian in their Christology.
The Church of Jesus Christ of Latter-day Saints.
The Church of Jesus Christ of Latter-day Saints (LDS Church) teaches a nontrinitarian theology concerning the nature of the Godhead. Similarities between LDS doctrines and Arianism were alleged as early as 1846. There are a number of key differences between Arianism and Latter-day Saint theology. Whereas Arianism is a unitarian Christian form of classical theism, Latter-day Saint theology is a non-trinitarian (but not unitarian) form of Christianity outside of classical theism. Arianism also teaches that God is eternal, was never a man, and could not incarnate as a man; in contrast, the LDS Church teaches that "God Himself is an exalted man, perfected, enthroned, and supreme."
Whereas Arianism denies that humans can become gods, the LDS Church affirms that humans can become gods through exaltation. Whereas Arianism teaches that the Son was created, the LDS Church also teaches that the Son was procreated as a literal spirit child of the Heavenly Father and the Heavenly Mother and denies any form of creation "ex nihilo"; the creation of Christ "ex nihilo" is, in contrast, a fundamental premise of Arianism.
The LDS church, in contrast to the Arian teaching that God is incorporeal, also teaches that God has a tangible body: "The Father has a body of flesh and bones as tangible as man's; the Son also; but the Holy Ghost has not a body of flesh and bones, but is a personage of Spirit. Were it not so, the Holy Ghost could not dwell in us." Arianism traditionally taught that God is incomprehensible even to the Son. In contrast, the LDS Church rejects the doctrine that God is incomprehensible. Though Arianism teaches that Christ is ontologically inferior and subordinate to the Father, the LDS Church teaches that Christ is equal in power and glory with the Father.
The LDS Church teaches that the Father, Son, and Holy Spirit are three separate beings united in purpose: "the Father, the Son and the Holy Spirit (or Holy Ghost)[...] are three physically separate beings, but fully one in love, purpose and will", as illustrated in Jesus' Farewell Prayer, his baptism at the hands of John the Baptist, his transfiguration, and the martyrdom of Stephen. Thus, the church's first Article of Faith states: "We believe in God, the Eternal Father, and in His Son, Jesus Christ, and in the Holy Ghost."
Latter-day Saints believe that the three are collectively "one eternal God" but reject the Nicene definition of the Trinity, that the three are consubstantial. In some respects, Latter-day Saint theology is more similar to social trinitarianism than to Arianism.
Spiritism.
According to the reincarnationist religion of Spiritism started by French educator Allan Kardec in the 19th century, Jesus is the highest-order of spirit that has ever incarnated on Earth and is distinct from God, by whom he was created. Jesus is not considered God or part of God as in Nicene Christianity, but is nonetheless the ultimate model of human love, intelligence, and forgiveness, often cited as the governor of Earth.
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Antoninus Pius
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Titus Aelius Hadrianus Antoninus Pius (; ; 19 September 86 – 7 March 161) was Roman emperor from AD 138 to 161. He was the fourth of the Five Good Emperors from the Nerva–Antonine dynasty.
Born into a senatorial family, Antoninus held various offices during the reign of Emperor Hadrian. He married Hadrian's niece Faustina, and Hadrian adopted him as his son and successor shortly before his death. Antoninus acquired the cognomen Pius after his accession to the throne, either because he compelled the Senate to deify his adoptive father, or because he had saved senators sentenced to death by Hadrian in his later years. His reign is notable for the peaceful state of the Empire, with no major revolts or military incursions during this time. A successful military campaign in southern Scotland early in his reign resulted in the construction of the Antonine Wall.
Antoninus was an effective administrator, leaving his successors a large surplus in the treasury, expanding free access to drinking water throughout the Empire, encouraging legal conformity, and facilitating the enfranchisement of freed slaves. He died of illness in AD 161 and was succeeded by his adopted sons Marcus Aurelius and Lucius Verus as co-emperors.
Early life.
Childhood and family.
Antoninus Pius was born Titus Aurelius Fulvus Boionius Antoninus in 86, near Lanuvium (modern-day Lanuvio) in Italy to Titus Aurelius Fulvus, consul in 89, and wife Arria Fadilla. The Aurelii Fulvi were an Aurelian family settled in Nemausus (modern Nîmes). Titus Aurelius Fulvus was the son of a senator of the same name, who, as legate of Legio III Gallica, had supported Vespasian in his bid to the Imperial office and been rewarded with a suffect consulship, plus an ordinary one under Domitian in 85. The Aurelii Fulvi were therefore a relatively new senatorial family from Gallia Narbonensis whose rise to prominence was supported by the Flavians. The link between Antoninus's family and their home province explains the increasing importance of the post of proconsul of Gallia Narbonensis during the late second century.
Antoninus's father had no other children and died shortly after his 89 ordinary consulship. Antoninus was raised by his maternal grandfather Gnaeus Arrius Antoninus, reputed by contemporaries to be a man of integrity and culture and a friend of Pliny the Younger. The Arrii Antonini were an older senatorial family from Italy, very influential during Nerva's reign. Arria Fadilla, Antoninus's mother, married afterwards Publius Julius Lupus, suffect consul in 98; from that marriage came two daughters, Arria Lupula and Julia Fadilla.
Marriage and children.
Some time between 110 and 115, Antoninus married Annia Galeria Faustina the Elder. They are believed to have enjoyed a happy marriage. Faustina was the daughter of consul Marcus Annius Verus (II) and Rupilia Faustina (often thought to be a step-sister to the Empress Vibia Sabina or more likely a granddaughter of the emperor Vitellius.) Faustina was a beautiful woman, and despite rumours about her character, it is clear that Antoninus cared for her deeply.
Faustina bore Antoninus four children, two sons and two daughters. They were:
When Faustina died in 141, Antoninus was greatly distressed. In honour of her memory, he asked the Senate to deify her as a goddess, and authorised the construction of a temple to be built in the Roman Forum in her name, with priestesses serving in her temple. He had various coins with her portrait struck in her honor. These coins were scripted "DIVA FAUSTINA" and were elaborately decorated. He further founded a charity, calling it "Puellae Faustinianae" or "Girls of Faustina", which assisted destitute girls of good family. Finally, Antoninus created a new "alimenta", a Roman welfare programme, as part of "Cura Annonae".
The emperor never remarried. Instead, he lived with Galeria Lysistrate, Faustina's freedwoman. Concubinage was a form of female companionship sometimes chosen by powerful men in Ancient Rome, especially widowers like Vespasian, and Marcus Aurelius. Their union could not produce any legitimate offspring who could threaten any heirs, such as those of Antoninus. Also, as one could not have a wife and an official concubine (or two concubines) at the same time, Antoninus avoided being pressed into a marriage with a noblewoman from another family. (Later, Marcus Aurelius would also reject the advances of his former fiancée Ceionia Fabia, Lucius Verus's sister, on the grounds of protecting his children from a stepmother, and took a concubine instead.)
Favour with Hadrian.
Having filled the offices of quaestor and praetor with more than usual success, he obtained the consulship in 120 having as his colleague Lucius Catilius Severus. He was next appointed by the Emperor Hadrian as one of the four proconsuls to administer Italia, his district including Etruria, where he had estates. He then greatly increased his reputation by his conduct as proconsul of Asia, probably during 134–135.
He acquired much favor with Hadrian, who adopted him as his son and successor on 25 February 138, after the death of his first adopted son Lucius Aelius, on the condition that Antoninus would in turn adopt Marcus Annius Verus, the son of his wife's brother, and Lucius, son of Lucius Aelius, who afterwards became the emperors Marcus Aurelius and Lucius Verus. He also adopted (briefly) the name Imperator Titus Aelius Caesar Antoninus, in preparation for his rule. There seems to have been some opposition to Antoninus's appointment on the part of other potential claimants, among them his former consular colleague Lucius Catilius Severus, then prefect of the city. Nevertheless, Antoninus assumed power without opposition.
Emperor.
On his accession, Antoninus's name and style became "Imperator Caesar Titus Aelius Hadrianus Antoninus Augustus". One of his first acts as emperor was to persuade the Senate to grant divine honours to Hadrian, which they had at first refused; his efforts to persuade the Senate to grant these honours is the most likely reason given for his title of "Pius" (dutiful in affection; compare "pietas"). Two other reasons for this title are that he would support his aged father-in-law with his hand at Senate meetings and that he had saved those men that Hadrian, during his period of ill health, had condemned to death.
Immediately after Hadrian's death, Antoninus approached Marcus and requested that his marriage arrangements be amended: Marcus's betrothal to Ceionia Fabia would be annulled, and he would be betrothed to Faustina, Antoninus's daughter instead. Faustina's betrothal to Ceionia's brother Lucius Commodus, Marcus's future co-emperor, would also have to be annulled. Marcus consented to Antoninus's proposal.
Antoninus built temples, theaters, and mausoleums, promoted the arts and sciences, and bestowed honours and financial rewards upon the teachers of rhetoric and philosophy. Antoninus made few initial changes when he became emperor, leaving the arrangements instituted by Hadrian as undisturbed as possible. Epigraphical and prosopographical research has revealed that Antoninus's imperial ruling team centered around a group of closely knit senatorial families, most of them members of the priestly congregation for the cult of Hadrian, the "sodales Hadrianales". According to the German historian H.-G. Pflaum, prosopographical research of Antoninus's ruling team allows us to grasp the deeply conservative character of the ruling senatorial caste.
He owned palatial villas near Lanuvium and Villa Magna (Latium) and his ancestral estate at Lorium (Etruria).
Lack of warfare.
There are no records of his involvement in military acts during his tenure, with J. J. Wilkes noting that he likely never saw or commanded a Roman army and was never within five hundred miles of a legion throughout his twenty-three-year reign.
His reign was the most peaceful in the entire history of the Principate, even though there were several military disturbances in the Empire in his time. Such disturbances happened in Mauretania, where a senator was named as governor of Mauretania Tingitana in place of the usual equestrian procurator and cavalry reinforcements from Pannonia were brought in, towns such as Sala and Tipasa being fortified. Similar disturbances took place in Judea, and amongst the Brigantes in Britannia; however, these were considered less serious than prior (and later) revolts among both. It was however in Britain that Antoninus decided to follow a new, more aggressive path, with the appointment of a new governor in 139, Quintus Lollius Urbicus, a native of Numidia and previously governor of Germania Inferior as well as a new man.
Under instructions from the emperor, Lollius undertook an invasion of southern Scotland, winning some significant victories and constructing the Antonine Wall from the Firth of Forth to the Firth of Clyde. However, the wall was soon gradually decommissioned during the mid-150s and eventually abandoned late during the reign (early 160s) for reasons that are still unclear. Antonine's Wall is mentioned in just one literary source, Antoninus's biography in the "Historia Augusta". Pausanias makes a brief and confused mention of a war in Britain. In one inscription honouring Antoninus, erected by Legio II Augusta, which participated in the building of the Wall, a relief showing four naked prisoners, one of them beheaded, seems to stand for some actual warfare.
Although Antonine's Wall was, in principle, much shorter (37 miles in length as opposed to 73) and, at first sight, more defensible than Hadrian's Wall, the additional area that it enclosed within the Empire was barren, with land use for grazing already in decay. This meant that supply lines to the wall were strained enough such that the costs of maintaining the additional territory outweighed the benefits of doing so. Also, in the absence of urban development and the ensuing Romanization process, the rear of the wall could not be lastingly pacified.
It has been speculated that the invasion of Lowland Scotland and the building of the wall had to do mostly with internal politics, that is, offering Antoninus an opportunity to gain some modicum of necessary military prestige at the start of his reign. An Imperial salutation followed the campaign in Britannia—that is, Antoninus formally took for the second (and last) time the title of Imperator in 142. The fact that around the same time coins were struck announcing a victory in Britain points to Antoninus's need to publicise his achievements. The orator Fronto was later to say that, although Antoninus bestowed the direction of the British campaign to others, he should be regarded as the helmsman who directed the voyage, whose glory, therefore, belonged to him.
That this quest for some military achievement responded to an actual need is proved by the fact that, although generally peaceful, Antoninus's reign was not free from attempts at usurpation: "Historia Augusta" mentions two, made by the senators Cornelius Priscianus ("for disturbing the peace of Spain"; Priscianus had also been Lollius Urbicus's successor as governor of Britain) and Atilius Rufius Titianus (possibly a troublemaker already exiled under Hadrian). Both attempts are confirmed by the Fasti Ostienses and by the erasing of Priscianus' name from an inscription. In both cases, Antoninus was not in formal charge of the ensuing repression: Priscianus committed suicide and Titianus was found guilty by the Senate, with Antoninus abstaining from sequestering their families' properties.
There were also some troubles in Dacia Inferior, which required the granting of additional powers to the procurator governor and the dispatch of additional soldiers to the province. On the northern Black Sea coast, the Greek city of Olbia was held against the Scythians. Also during his reign the governor of Upper Germany, probably Gaius Popillius Carus Pedo, built new fortifications in the Agri Decumates, advancing the Limes Germanicus fifteen miles forward in his province and neighboring Raetia. In the East, Roman suzerainty over Armenia was retained by the choice in AD 140 of Arsacid scion Sohaemus as client king.
Nevertheless, Antoninus was virtually unique among emperors in that he dealt with these crises without leaving Italy once during his reign, but instead dealt with provincial matters of war and peace through their governors or through imperial letters to the cities such as Ephesus (of which some were publicly displayed). His contemporaries and later generations highly praised this style of government.
Antoninus was the last Roman Emperor recognised by the Indian Kingdoms, especially the Kushan Empire. Raoul McLaughlin quotes Aurelius Victor as saying, "The Indians, the Bactrians, and the Hyrcanians all sent ambassadors to Antoninus. They had all heard about the spirit of justice held by this great emperor, justice that was heightened by his handsome and grave countenance, and his slim and vigorous figure." Due to the outbreak of the Antonine epidemic and wars against northern Germanic tribes, the reign of Marcus Aurelius was forced to alter the focus of foreign policies, and matters relating to the Far East were increasingly abandoned in favour of those directly concerning the Empire's survival.
Economy and administration.
Antoninus was regarded as a skilled administrator and builder. Despite an extensive building directive—the free access of the people of Rome to drinking water was expanded with the construction of aqueducts, not only in Rome but throughout the Empire, as well as bridges and roads—the emperor still managed to leave behind a sizable public treasury of around 2.7 billion sesterces. Rome would not witness another Emperor leaving his successor with a surplus for a long time, but the treasury was depleted almost immediately after Antoninus's reign due to the Antonine Plague brought back by soldiers after the Parthian victory.
The Emperor also famously suspended the collection of taxes from multiple cities affected by natural disasters, such as when fires struck Rome and Narbona, and earthquakes affected Rhodes and the Province of Asia. He offered hefty financial grants for rebuilding and recovery of various Greek cities after two serious earthquakes: the first, , which mainly affected Rhodes and other islands; the second, in 152, which hit Cyzicus (where the huge and newly built Temple to Hadrian was destroyed), Ephesus, and Smyrna. Antoninus's financial help earned him praise from Greek writers such as Aelius Aristides and Pausanias. These cities received the usual honorific accolades from Antoninus, such as when he commanded that all governors of Asia should enter the province when taking office through Ephesus. Ephesus was especially favoured by Antoninus, who confirmed and upheld its distinction of having two temples for the imperial cult (neocorate), therefore having first place in the list of imperial honor titles, surpassing both Smyrna and Pergamon.
In his dealings with Greek-speaking cities, Antoninus followed the policy adopted by Hadrian of ingratiating himself with local elites, especially with local intellectuals: philosophers, teachers of literature, rhetoricians, and physicians were explicitly exempted from any duties involving private spending for civic purposes, a privilege granted by Hadrian that Antoninus confirmed by means of an edict preserved in the Digest (27.1.6.8). Antoninus also created a chair for the teaching of rhetoric in Athens.
Antoninus was known as an avid observer of rites of religion and formal celebrations, both Roman and foreign. He is known for having increasingly formalized the official cult offered to the Great Mother, which from his reign onwards included a bull sacrifice, a taurobolium, formerly only a private ritual, now being also performed for the sake of the Emperor's welfare. Antoninus also offered patronage to the worship of Mithras, to whom he erected a temple in Ostia. In 148, he presided over the celebrations of the 900th anniversary of the founding of Rome.
Legal reforms.
Antoninus tried to portray himself as a magistrate of the "res publica", no matter how extended and ill-defined his competencies were. He is credited with splitting the imperial treasury, the fiscus. This splitting had to do with the division of imperial properties into two parts. Firstly, the fiscus itself, or "patrimonium", meaning the properties of the "Crown", the hereditary properties of each succeeding person that sat on the throne, transmitted to his successors in office, regardless of their previous membership in the imperial family. Secondly, the "res privata", the "private" properties tied to the personal maintenance of the emperor and his family, something like a Privy Purse. An anecdote in the "Historia Augusta" biography, where Antoninus replies to Faustina (who complained about his stinginess) that "we have gained an empire [and] lost even what we had before," possibly relates to Antoninus's actual concerns at the creation of the "res privata". While still a private citizen, Antoninus had increased his personal fortune significantly using various legacies, the consequence of his caring scrupulously for his relatives. Also, Antoninus left behind him a reputation for stinginess and was probably determined not to leave his personal property to be "swallowed up by the demands of the imperial throne".
The "res privata" lands could be sold and/or given away, while the "patrimonium" properties were regarded as public. It was a way of pretending that the Imperial function—and most properties attached to it—was a public one, formally subject to the authority of the Senate and the Roman people. That the distinction played no part in subsequent political history—that the "personal" power of the princeps absorbed his role as office-holder—proves that the autocratic logic of the imperial order had already subsumed the old republican institutions.
Of the public transactions of this period, there is only the scantiest of information. However, to judge by what is extant, those twenty-two years were not remarkably eventful compared to those before and after the reign. However, Antoninus did take a great interest in the revision and practice of the law throughout the empire. One of his chief concerns was to having local communities conform their legal procedures to existing Roman norms: in a case concerning the repression of banditry by local police officers ("irenarchs", Greek for "peacekeepers") in Asia Minor, Antoninus ordered that these officers should not treat suspects as already condemned, and also keep a detailed copy of their interrogations, to be used in the possibility of an appeal to the Roman governor. Also, although Antoninus was not an innovator, he would not always follow the absolute letter of the law. Rather, he was driven by concerns over humanity and equality and introduced into Roman law many important new principles based upon this notion.
In this, the emperor was assisted by five chief lawyers: Lucius Fulvius Aburnius Valens, an author of legal treatises; Lucius Ulpius Marcellus, a prolific writer; and three others. Of these three, the most prominent was Lucius Volusius Maecianus, a former military officer turned by Antoninus into a civil procurator, and who, given his subsequent career (discovered on the basis of epigraphical and prosopographic research), was the emperor's most important legal adviser. Maecianus would eventually be chosen to occupy various prefectures (see below) as well as to conduct the legal studies of Marcus Aurelius. He also authored an extensive work on "Fidei commissa" (Testamentary Trusts). As a hallmark of the increased connection between jurists and the imperial government, Antoninus's reign also saw the appearance of the "Institutes" of Gaius, an elementary legal textbook for beginners.
Antoninus passed measures to facilitate the enfranchisement of slaves. Mostly, he favoured the principle of "favor libertatis", giving the putative freedman the benefit of the doubt when the claim to freedom was not clear-cut. Also, he punished the killing of a slave by their master without previous trial and determined that slaves could be forcibly sold to another master by a proconsul in cases of consistent mistreatment. Antoninus upheld the enforcement of contracts for selling of female slaves forbidding their further employment in prostitution. In criminal law, Antoninus introduced the important principle of the presumption of innocence—namely, that accused persons are not to be treated as guilty before trial, as in the case of the irenarchs (see above). Antoninus also asserted the principle that the trial was to be held and the punishment inflicted in the place where the crime had been committed. He mitigated the use of torture in examining slaves by certain limitations. Thus, he prohibited the application of torture to children under fourteen years, though this rule had exceptions. However, it must be stressed that Antoninus "extended", using a rescript, the use of torture as a means of obtaining evidence to pecuniary cases, when it had been applied up until then only in criminal cases. Also, already at the time torture of free men of low status ("humiliores") had become legal, as proved by the fact that Antoninus exempted town councillors expressly from it, and also free men of high rank ("honestiores") in general.
One highlight during his reign occurred in 148, with the 900th anniversary of the foundation of Rome being celebrated by hosting magnificent games in the city. It lasted many days, and a host of exotic animals were killed, including elephants, giraffes, tigers, rhinoceroses, crocodiles and hippopotamuses. While this increased Antoninus's popularity, the frugal emperor had to debase the Roman currency. He decreased the silver purity of the denarius from 89% to 83.5, the actual silver weight dropping from 2.88 grams to 2.68 grams.
Antoninus is a likely candidate for the Antoninus named multiple times in the Talmud as a friend of Rabbi Judah Ha-Nasi. In the Talmudic tractate "Avodah Zarah" 10a–b, Rabbi Judah—exceptionally wealthy and highly revered in Rome—shared a close friendship with a man named Antoninus (possibly Antoninus Pius), who frequently sought his counsel on spiritual (in this context, Jewish), philosophical, and governance matters.
Diplomatic mission to China.
The first group of people claiming to be an ambassadorial mission of Romans to China was recorded in 166 AD by the "Hou Hanshu". Harper (2017) states that the embassy was likely to be a group of merchants, as many Roman merchants traveled to India and some might have gone beyond, while there are no records of official ambassadors of Rome travelling as far east. The group came to Emperor Huan of Han China and claimed to be an embassy from "Andun" (; for "Anton"-inus), "king of Daqin" (Rome). As Antoninus Pius died in 161, leaving the empire to his adoptive son Marcus Aurelius (Antoninus), and the envoy arrived in 166, confusion remains about who sent the mission, given that both emperors were named "Antoninus". The Roman mission came from the south (therefore probably by sea), entering China by the frontier province of Jiaozhi at Rinan or Tonkin (present-day northern Vietnam). It brought presents of rhinoceros horns, ivory, and tortoise shell, probably acquired in South Asia. The text states explicitly that it was the first time there had been direct contact between the two countries.
Furthermore, a piece of Republican-era Roman glassware has been found at a Western Han tomb in Guangzhou along the South China Sea, dated to the early 1st century BC. Roman golden medallions made during the reign of Antoninus Pius and perhaps even Marcus Aurelius have been found at Óc Eo in southern Vietnam, then part of the Kingdom of Funan near the Chinese province of Jiaozhi. This may have been the port city of Kattigara, described by Ptolemy () as being visited by a Greek sailor named Alexander and lying beyond the Golden Chersonese (i.e., Malay Peninsula). Roman coins from the reigns of Tiberius to Aurelian have been discovered in Xi'an, China (site of the Han capital Chang'an), although the significantly greater amount of Roman coins unearthed in India suggest the Roman maritime trade for purchasing Chinese silk was centered there, not in China or even the overland Silk Road running through ancient Iran.
Death and legacy.
In 156, Antoninus Pius turned 70. He found it difficult to keep himself upright without stays. He started nibbling on dry bread to give him the strength to stay awake through his morning receptions.
Marcus Aurelius had already been created consul with Antoninus in 140, receiving the title of Caesar, i.e., heir apparent. As Antoninus aged, Marcus took on more administrative duties. Marcus's administrative duties increased again after the death, in 156 or 157, of one of Antoninus's most trusted advisers, Marcus Gavius Maximus.
For twenty years, Gavius Maximus had been praetorian prefect, an office that was as much secretarial as military. Gavius Maximus had been awarded with the consular insignia and the honours due a senator. He had a reputation as a most strict disciplinarian ("vir severissimus", according to "Historia Augusta") and some fellow equestrian procurators held lasting grudges against him. A procurator named Gaius Censorius Niger died while Gavius Maximus was alive. In his will, Censorius Niger vilified Maximus, creating serious embarrassment for one of the heirs, the orator Fronto.
Gavius Maximus's death initiated a change in the ruling team. It has been speculated that it was the legal adviser Lucius Volusius Maecianus who assumed the role of grey eminence. Maecianus was briefly Praefect of Egypt, and subsequently Praefectus annonae in Rome. If it was Maecianus who rose to prominence, he may have risen precisely in order to prepare the incoming—and unprecedented—joint succession. In 160, Marcus and Lucius were designated joint consuls for the following year. Perhaps Antoninus was already ill; in any case, he died before the year was out, probably on 7 March.
Two days before his death, the biographer reports, Antoninus was at his ancestral estate at Lorium, in Etruria, about from Rome. He ate Alpine cheese at dinner quite greedily. In the night he vomited; he had a fever the next day. The day after that, he summoned the imperial council, and passed the state and his daughter to Marcus. The emperor gave the keynote to his life in the last word that he uttered: when the tribune of the night-watch came to ask the password, he responded, "aequanimitas" (equanimity). He then turned over, as if going to sleep, and died. His death closed out the longest reign since Augustus (surpassing Tiberius by a couple of months). His record for the second-longest reign would be unbeaten for 168 years, until 329 when it was surpassed by Constantine the Great.
Antoninus Pius' funeral ceremonies were, in the words of the biographer, "elaborate". If his funeral followed the pattern of past funerals, his body would have been incinerated on a pyre at the Campus Martius, while his spirit would rise to the gods' home in the heavens. However, it seems that this was not the case: according to his "Historia Augusta" biography (which seems to reproduce an earlier, detailed report) Antoninus's body (and not his ashes) was buried in Hadrian's mausoleum. After a seven-day interval ("justitium"), Marcus and Lucius nominated their father for deification. In contrast to their behaviour during Antoninus's campaign to deify Hadrian, the senate did not oppose the emperors' wishes. A "flamen", or cultic priest, was appointed to minister the cult of the deified Antoninus, now "Divus Antoninus".
A column was dedicated to Antoninus on the Campus Martius, and the temple he had built in the Forum in 141 to his deified wife Faustina was rededicated to the deified Faustina and the deified Antoninus. It survives as the church of San Lorenzo in Miranda.
Historiography.
The only intact account of his life handed down to us is that of the "Augustan History", an unreliable and mostly fabricated work. Nevertheless, it still contains information that is considered reasonably sound; for instance, it is the only source that mentions the erection of the Antonine Wall in Britain.
Antoninus in many ways was the ideal of the landed gentleman praised not only by ancient Romans, but also by later scholars of classical history, such as Edward Gibbon or the author of the article on Antoninus Pius in the "Encyclopædia Britannica" Eleventh Edition.
Some historians have a less positive view of his reign. According to the historian J. B. Bury,
German historian Ernst Kornemann has had it in his "Römische Geschichte" [2 vols., ed. by H. Bengtson, Stuttgart 1954] that the reign of Antoninus comprised "a succession of grossly wasted opportunities", given the upheavals that were to come. There is more to this argument, given that the Parthians in the East were themselves soon to make no small amount of mischief after Antoninus's death. Kornemann's brief is that Antoninus might have waged preventive wars to head off these outsiders. Michael Grant agrees that it is possible that had Antoninus acted decisively sooner (it appears that, on his death bed, he was preparing a large-scale action against the Parthians), the Parthians might have been unable to choose their own time, but current evidence is not conclusive. Grant opines that Antoninus and his officers did act in a resolute manner dealing with frontier disturbances of his time, although conditions for long-lasting peace were not created. On the whole, according to Grant, Marcus Aurelius's eulogistic picture of Antoninus seems deserved, and Antoninus appears to have been a conservative and nationalistic (although he respected and followed Hadrian's example of Philhellenism moderately) emperor who was not tainted by the blood of either citizen or foe, combined and maintained Numa Pompilius's good fortune, pacific dutifulness and religious scrupulousness, and whose laws removed anomalies and softened harshnesses.
Krzysztof Ulanowski argues that the claims of military inability are exaggerated, considering that although the sources praise Antoninus's love for peace and his efforts "rather to defend, than enlarge the provinces", he could hardly be considered a pacifist, as shown by the conquest of the Lowlands, the building of the Antonine Wall and the expansion of Germania Superior. Ulanowski also praises Antoninus for being successful in deterrence by diplomatic means.
Descendants.
Although only one of his four children survived to adulthood, Antoninus came to be ancestor to four generations of prominent Romans, including the Emperor Commodus. Hans-Georg Pflaum has identified five direct descendants of Antoninus and Faustina who were consuls in the first half of the third century.
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Advanced Encryption Standard
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The Advanced Encryption Standard (AES), also known by its original name Rijndael (), is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST) in 2001.
AES is a variant of the Rijndael block cipher developed by two Belgian cryptographers, Joan Daemen and Vincent Rijmen, who submitted a proposal to NIST during the AES selection process. Rijndael is a family of ciphers with different key and block sizes. For AES, NIST selected three members of the Rijndael family, each with a block size of 128 bits, but three different key lengths: 128, 192 and 256 bits.
AES has been adopted by the U.S. government. It supersedes the Data Encryption Standard (DES), which was published in 1977. The algorithm described by AES is a symmetric-key algorithm, meaning the same key is used for both encrypting and decrypting the data.
In the United States, AES was announced by the NIST as U.S. FIPS PUB 197 (FIPS 197) on November 26, 2001. This announcement followed a five-year standardization process in which fifteen competing designs were presented and evaluated, before the Rijndael cipher was selected as the most suitable.
AES is included in the ISO/IEC 18033-3 standard. AES became effective as a U.S. federal government standard on May 26, 2002, after approval by U.S. Secretary of Commerce Donald Evans. AES is available in many different encryption packages, and is the first (and only) publicly accessible cipher approved by the U.S. National Security Agency (NSA) for top secret information when used in an NSA approved cryptographic module.
Definitive standards.
The Advanced Encryption Standard (AES) is defined in each of:
Description of the ciphers.
AES is based on a design principle known as a substitution–permutation network, and is efficient in both software and hardware. Unlike its predecessor DES, AES does not use a Feistel network. AES is a variant of Rijndael, with a fixed block size of 128 bits, and a key size of 128, 192, or 256 bits. By contrast, Rijndael "per se" is specified with block and key sizes that may be any multiple of 32 bits, with a minimum of 128 and a maximum of 256 bits. Most AES calculations are done in a particular finite field.
AES operates on a 4 × 4 column-major order array of 16 bytes termed the "state":
formula_1
The key size used for an AES cipher specifies the number of transformation rounds that convert the input, called the plaintext, into the final output, called the ciphertext. The number of rounds are as follows:
Each round consists of several processing steps, including one that depends on the encryption key itself. A set of reverse rounds are applied to transform ciphertext back into the original plaintext using the same encryption key.
The step.
In the step, each byte formula_2 in the "state" array is replaced with a formula_3 using an 8-bit substitution box. Before round 0, the "state" array is simply the plaintext/input. This operation provides the non-linearity in the cipher. The S-box used is derived from the multiplicative inverse over , known to have good non-linearity properties. To avoid attacks based on simple algebraic properties, the S-box is constructed by combining the inverse function with an invertible affine transformation. The S-box is also chosen to avoid any fixed points (and so is a derangement), i.e., formula_4, and also any opposite fixed points, i.e., formula_5.
While performing the decryption, the step (the inverse of ) is used, which requires first taking the inverse of the affine transformation and then finding the multiplicative inverse.
The step.
The step operates on the rows of the state; it cyclically shifts the bytes in each row by a certain offset. For AES, the first row is left unchanged. Each byte of the second row is shifted one to the left. Similarly, the third and fourth rows are shifted by offsets of two and three respectively. In this way, each column of the output state of the step is composed of bytes from each column of the input state. The importance of this step is to avoid the columns being encrypted independently, in which case AES would degenerate into four independent block ciphers.
The step.
In the step, the four bytes of each column of the state are combined using an invertible linear transformation. The function takes four bytes as input and outputs four bytes, where each input byte affects all four output bytes. Together with , provides diffusion in the cipher.
During this operation, each column is transformed using a fixed matrix (matrix left-multiplied by column gives new value of column in the state):
formula_6
Matrix multiplication is composed of multiplication and addition of the entries. Entries are bytes treated as coefficients of polynomial of order formula_7. Addition is simply XOR. Multiplication is modulo irreducible polynomial formula_8. If processed bit by bit, then, after shifting, a conditional XOR with 1B16 should be performed if the shifted value is larger than FF16 (overflow must be corrected by subtraction of generating polynomial). These are special cases of the usual multiplication in formula_9.
In more general sense, each column is treated as a polynomial over formula_9 and is then multiplied modulo formula_11 with a fixed polynomial formula_12. The coefficients are displayed in their hexadecimal equivalent of the binary representation of bit polynomials from formula_13. The step can also be viewed as a multiplication by the shown particular MDS matrix in the finite field formula_9. This process is described further in the article Rijndael MixColumns.
The.
In the step, the subkey is combined with the state. For each round, a subkey is derived from the main key using Rijndael's key schedule; each subkey is the same size as the state. The subkey is added by combining of the state with the corresponding byte of the subkey using bitwise XOR.
Optimization of the cipher.
On systems with 32-bit or larger words, it is possible to speed up execution of this cipher by combining the and steps with the step by transforming them into a sequence of table lookups. This requires four 256-entry 32-bit tables (together occupying 4096 bytes). A round can then be performed with 16 table lookup operations and 12 32-bit exclusive-or operations, followed by four 32-bit exclusive-or operations in the step. Alternatively, the table lookup operation can be performed with a single 256-entry 32-bit table (occupying 1024 bytes) followed by circular rotation operations.
Using a byte-oriented approach, it is possible to combine the , , and steps into a single round operation.
Security.
The National Security Agency (NSA) reviewed all the AES finalists, including Rijndael, and stated that all of them were secure enough for U.S. Government non-classified data. In June 2003, the U.S. Government announced that AES could be used to protect classified information:
The design and strength of all key lengths of the AES algorithm (i.e., 128, 192 and 256) are sufficient to protect classified information up to the SECRET level. TOP SECRET information will require use of either the 192 or 256 key lengths. The implementation of AES in products intended to protect national security systems and/or information must be reviewed and certified by NSA prior to their acquisition and use.
AES has 10 rounds for 128-bit keys, 12 rounds for 192-bit keys, and 14 rounds for 256-bit keys.
Known attacks.
For cryptographers, a cryptographic "break" is anything faster than a brute-force attacki.e., performing one trial decryption for each possible key in sequence . A break can thus include results that are infeasible with current technology. Despite being impractical, theoretical breaks can sometimes provide insight into vulnerability patterns. The largest successful publicly known brute-force attack against a widely implemented block-cipher encryption algorithm was against a 64-bit RC5 key by distributed.net in 2006.
The key space increases by a factor of 2 for each additional bit of key length, and if every possible value of the key is equiprobable; this translates into a doubling of the average brute-force key search time with every additional bit of key length. This implies that the effort of a brute-force search increases exponentially with key length. Key length in itself does not imply security against attacks, since there are ciphers with very long keys that have been found to be vulnerable.
AES has a fairly simple algebraic framework. In 2002, a theoretical attack, named the "XSL attack", was announced by Nicolas Courtois and Josef Pieprzyk, purporting to show a weakness in the AES algorithm, partially due to the low complexity of its nonlinear components. Since then, other papers have shown that the attack, as originally presented, is unworkable; see XSL attack on block ciphers.
During the AES selection process, developers of competing algorithms wrote of Rijndael's algorithm "we are concerned about [its] use ... in security-critical applications." In October 2000, however, at the end of the AES selection process, Bruce Schneier, a developer of the competing algorithm Twofish, wrote that while he thought successful academic attacks on Rijndael would be developed someday, he "did not believe that anyone will ever discover an attack that will allow someone to read Rijndael traffic."
By 2006, the best known attacks were on 7 rounds for 128-bit keys, 8 rounds for 192-bit keys, and 9 rounds for 256-bit keys.
Until May 2009, the only successful published attacks against the full AES were side-channel attacks on some specific implementations. In 2009, a new related-key attack was discovered that exploits the simplicity of AES's key schedule and has a complexity of 2119. In December 2009 it was improved to 299.5. This is a follow-up to an attack discovered earlier in 2009 by Alex Biryukov, Dmitry Khovratovich, and Ivica Nikolić, with a complexity of 296 for one out of every 235 keys. However, related-key attacks are not of concern in any properly designed cryptographic protocol, as a properly designed protocol (i.e., implementational software) will take care not to allow related keys, essentially by constraining an attacker's means of selecting keys for relatedness.
Another attack was blogged by Bruce Schneier
on July 30, 2009, and released as a preprint
on August 3, 2009. This new attack, by Alex Biryukov, Orr Dunkelman, Nathan Keller, Dmitry Khovratovich, and Adi Shamir, is against AES-256 that uses only two related keys and 239 time to recover the complete 256-bit key of a 9-round version, or 245 time for a 10-round version with a stronger type of related subkey attack, or 270 time for an 11-round version. 256-bit AES uses 14 rounds, so these attacks are not effective against full AES.
The practicality of these attacks with stronger related keys has been criticized, for instance, by the paper on chosen-key-relations-in-the-middle attacks on AES-128 authored by Vincent Rijmen in 2010.
In November 2009, the first known-key distinguishing attack against a reduced 8-round version of AES-128 was released as a preprint.
This known-key distinguishing attack is an improvement of the rebound, or the start-from-the-middle attack, against AES-like permutations, which view two consecutive rounds of permutation as the application of a so-called Super-S-box. It works on the 8-round version of AES-128, with a time complexity of 248, and a memory complexity of 232. 128-bit AES uses 10 rounds, so this attack is not effective against full AES-128.
The first key-recovery attacks on full AES were by Andrey Bogdanov, Dmitry Khovratovich, and Christian Rechberger, and were published in 2011. The attack is a biclique attack and is faster than brute force by a factor of about four. It requires 2126.2 operations to recover an AES-128 key. For AES-192 and AES-256, 2190.2 and 2254.6 operations are needed, respectively. This result has been further improved to 2126.0 for AES-128, 2189.9 for AES-192, and 2254.3 for AES-256 by Biaoshuai Tao and Hongjun Wu in a 2015 paper, which are the current best results in key recovery attack against AES.
This is a very small gain, as a 126-bit key (instead of 128 bits) would still take billions of years to brute force on current and foreseeable hardware. Also, the authors calculate the best attack using their technique on AES with a 128-bit key requires storing 288 bits of data. That works out to about 38 trillion terabytes of data, which was more than all the data stored on all the computers on the planet in 2016. A paper in 2015 later improved the space complexity to 256 bits, which is 9007 terabytes (while still keeping a time complexity of approximately 2126).
According to the Snowden documents, the NSA is doing research on whether a cryptographic attack based on tau statistic may help to break AES.
At present, there is no known practical attack that would allow someone without knowledge of the key to read data encrypted by AES when correctly implemented.
Side-channel attacks.
Side-channel attacks do not attack the cipher as a black box, and thus are not related to cipher security as defined in the classical context, but are important in practice. They attack implementations of the cipher on hardware or software systems that inadvertently leak data. There are several such known attacks on various implementations of AES.
In April 2005, D. J. Bernstein announced a cache-timing attack that he used to break a custom server that used OpenSSL's AES encryption. The attack required over 200 million chosen plaintexts. The custom server was designed to give out as much timing information as possible (the server reports back the number of machine cycles taken by the encryption operation). However, as Bernstein pointed out, "reducing the precision of the server's timestamps, or eliminating them from the server's responses, does not stop the attack: the client simply uses round-trip timings based on its local clock, and compensates for the increased noise by averaging over a larger number of samples."
In October 2005, Dag Arne Osvik, Adi Shamir and Eran Tromer presented a paper demonstrating several cache-timing attacks against the implementations in AES found in OpenSSL and Linux's codice_1 partition encryption function. One attack was able to obtain an entire AES key after only 800 operations triggering encryptions, in a total of 65 milliseconds. This attack requires the attacker to be able to run programs on the same system or platform that is performing AES.
In December 2009 an attack on some hardware implementations was published that used differential fault analysis and allows recovery of a key with a complexity of 232.
In November 2010 Endre Bangerter, David Gullasch and Stephan Krenn published a paper which described a practical approach to a "near real time" recovery of secret keys from AES-128 without the need for either cipher text or plaintext. The approach also works on AES-128 implementations that use compression tables, such as OpenSSL. Like some earlier attacks, this one requires the ability to run unprivileged code on the system performing the AES encryption, which may be achieved by malware infection far more easily than commandeering the root account.
In March 2016, C. Ashokkumar, Ravi Prakash Giri and Bernard Menezes presented a side-channel attack on AES implementations that can recover the complete 128-bit AES key in just 6–7 blocks of plaintext/ciphertext, which is a substantial improvement over previous works that require between 100 and a million encryptions. The proposed attack requires standard user privilege and key-retrieval algorithms run under a minute.
Many modern CPUs have built-in hardware instructions for AES, which protect against timing-related side-channel attacks.
Quantum attacks.
AES-256 is considered to be quantum resistant, as it has similar quantum resistance to AES-128's resistance against traditional, non-quantum, attacks at 128 bits of security. AES-192 and AES-128 are not considered quantum resistant due to their smaller key sizes. AES-192 has a strength of 96 bits against quantum attacks and AES-128 has 64 bits of strength against quantum attacks, making them both insecure.
NIST/CSEC validation.
The Cryptographic Module Validation Program (CMVP) is operated jointly by the United States Government's National Institute of Standards and Technology (NIST) Computer Security Division and the Communications Security Establishment (CSE) of the Government of Canada. The use of cryptographic modules validated to NIST FIPS 140-2 is required by the United States Government for encryption of all data that has a classification of Sensitive but Unclassified (SBU) or above. From NSTISSP #11, National Policy Governing the Acquisition of Information Assurance: "Encryption products for protecting classified information will be certified by NSA, and encryption products intended for protecting sensitive information will be certified in accordance with NIST FIPS 140-2."
The Government of Canada also recommends the use of FIPS 140 validated cryptographic modules in unclassified applications of its departments.
Although NIST publication 197 ("FIPS 197") is the unique document that covers the AES algorithm, vendors typically approach the CMVP under FIPS 140 and ask to have several algorithms (such as Triple DES or SHA1) validated at the same time. Therefore, it is rare to find cryptographic modules that are uniquely FIPS 197 validated and NIST itself does not generally take the time to list FIPS 197 validated modules separately on its public web site. Instead, FIPS 197 validation is typically just listed as an "FIPS approved: AES" notation (with a specific FIPS 197 certificate number) in the current list of FIPS 140 validated cryptographic modules.
The Cryptographic Algorithm Validation Program (CAVP) allows for independent validation of the correct implementation of the AES algorithm. Successful validation results in being listed on the NIST validations page. This testing is a pre-requisite for the FIPS 140-2 module validation. However, successful CAVP validation in no way implies that the cryptographic module implementing the algorithm is secure. A cryptographic module lacking FIPS 140-2 validation or specific approval by the NSA is not deemed secure by the US Government and cannot be used to protect government data.
FIPS 140-2 validation is challenging to achieve both technically and fiscally. There is a standardized battery of tests as well as an element of source code review that must be passed over a period of a few weeks. The cost to perform these tests through an approved laboratory can be significant (e.g., well over ) and does not include the time it takes to write, test, document and prepare a module for validation. After validation, modules must be re-submitted and re-evaluated if they are changed in any way. This can vary from simple paperwork updates if the security functionality did not change to a more substantial set of re-testing if the security functionality was impacted by the change.
Test vectors.
Test vectors are a set of known ciphers for a given input and key. NIST distributes the reference of AES test vectors as AES Known Answer Test (KAT) Vectors.
Performance.
High speed and low RAM requirements were some of the criteria of the AES selection process. As the chosen algorithm, AES performed well on a wide variety of hardware, from 8-bit smart cards to high-performance computers.
On a Pentium Pro, AES encryption requires 18 clock cycles per byte (cpb), equivalent to a throughput of about 11 MiB/s for a 200 MHz processor.
On Intel Core and AMD Ryzen CPUs supporting AES-NI instruction set extensions, throughput can be multiple GiB/s. On an Intel Westmere CPU, AES encryption using AES-NI takes about 1.3 cpb for AES-128 and 1.8 cpb for AES-256.
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Anisotropy
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Anisotropy () is the structural property of non-uniformity in different directions, as opposed to isotropy. An anisotropic object or pattern has properties that differ according to direction of measurement. For example, many materials exhibit very different physical or mechanical properties when measured along different axes, e.g. absorbance, refractive index, conductivity, and tensile strength.
An example of anisotropy is light coming through a polarizer. Another is wood, which is easier to split along its grain than across it because of the directional non-uniformity of the grain (the grain is the same in one direction, not all directions).
Fields of interest.
Computer graphics.
In the field of computer graphics, an anisotropic surface changes in appearance as it rotates about its geometric normal, as is the case with velvet.
Anisotropic filtering (AF) is a method of enhancing the image quality of textures on surfaces that are far away and viewed at a shallow angle. Older techniques, such as bilinear and trilinear filtering, do not take into account the angle a surface is viewed from, which can result in aliasing or blurring of textures. By reducing detail in one direction more than another, these effects can be reduced easily.
Chemistry.
A chemical anisotropic filter, as used to filter particles, is a filter with increasingly smaller interstitial spaces in the direction of filtration so that the proximal regions filter out larger particles and distal regions increasingly remove smaller particles, resulting in greater flow-through and more efficient filtration.
In fluorescence spectroscopy, the fluorescence anisotropy, calculated from the polarization properties of fluorescence from samples excited with plane-polarized light, is used, e.g., to determine the shape of a macromolecule. Anisotropy measurements reveal the average angular displacement of the fluorophore that occurs between absorption and subsequent emission of a photon.
In NMR spectroscopy, the orientation of nuclei with respect to the applied magnetic field determines their chemical shift. In this context, anisotropic systems refer to the electron distribution of molecules with abnormally high electron density, like the pi system of benzene. This abnormal electron density affects the applied magnetic field and causes the observed chemical shift to change.
Real-world imagery.
Images of a gravity-bound or man-made environment are particularly anisotropic in the orientation domain, with more image structure located at orientations parallel with or orthogonal to the direction of gravity (vertical and horizontal).
Physics.
Physicists from University of California, Berkeley reported about their detection of the cosmic anisotropy in cosmic microwave background radiation in 1977. Their experiment demonstrated the Doppler shift caused by the movement of the earth with respect to the early Universe matter, the source of the radiation. Cosmic anisotropy has also been seen in the alignment of galaxies' rotation axes and polarization angles of quasars.
Physicists use the term anisotropy to describe direction-dependent properties of materials. Magnetic anisotropy, for example, may occur in a plasma, so that its magnetic field is oriented in a preferred direction. Plasmas may also show "filamentation" (such as that seen in lightning or a plasma globe) that is directional.
An "anisotropic liquid" has the fluidity of a normal liquid, but has an average structural order relative to each other along the molecular axis, unlike water or chloroform, which contain no structural ordering of the molecules. Liquid crystals are examples of anisotropic liquids.
Some materials conduct heat in a way that is isotropic, that is independent of spatial orientation around the heat source. Heat conduction is more commonly anisotropic, which implies that detailed geometric modeling of typically diverse materials being thermally managed is required. The materials used to transfer and reject heat from the heat source in electronics are often anisotropic.
Many crystals are anisotropic to light ("optical anisotropy"), and exhibit properties such as birefringence. Crystal optics describes light propagation in these media. An "axis of anisotropy" is defined as the axis along which isotropy is broken (or an axis of symmetry, such as normal to crystalline layers). Some materials can have multiple such optical axes.
Geophysics and geology.
Seismic anisotropy is the variation of seismic wavespeed with direction. Seismic anisotropy is an indicator of long range order in a material, where features smaller than the seismic wavelength (e.g., crystals, cracks, pores, layers, or inclusions) have a dominant alignment. This alignment leads to a directional variation of elasticity wavespeed. Measuring the effects of anisotropy in seismic data can provide important information about processes and mineralogy in the Earth; significant seismic anisotropy has been detected in the Earth's crust, mantle, and inner core.
Geological formations with distinct layers of sedimentary material can exhibit electrical anisotropy; electrical conductivity in one direction (e.g. parallel to a layer), is different from that in another (e.g. perpendicular to a layer). This property is used in the gas and oil exploration industry to identify hydrocarbon-bearing sands in sequences of sand and shale. Sand-bearing hydrocarbon assets have high resistivity (low conductivity), whereas shales have lower resistivity. Formation evaluation instruments measure this conductivity or resistivity, and the results are used to help find oil and gas in wells. The mechanical anisotropy measured for some of the sedimentary rocks like coal and shale can change with corresponding changes in their surface properties like sorption when gases are produced from the coal and shale reservoirs.
The hydraulic conductivity of aquifers is often anisotropic for the same reason. When calculating groundwater flow to drains or to wells, the difference between horizontal and vertical permeability must be taken into account; otherwise the results may be subject to error.
Most common rock-forming minerals are anisotropic, including quartz and feldspar. Anisotropy in minerals is most reliably seen in their optical properties. An example of an isotropic mineral is garnet.
Igneous rock like granite also shows the anisotropy due to the orientation of the minerals during the solidification process.
Medical acoustics.
Anisotropy is also a well-known property in medical ultrasound imaging describing a different resulting echogenicity of soft tissues, such as tendons, when the angle of the transducer is changed. Tendon fibers appear hyperechoic (bright) when the transducer is perpendicular to the tendon, but can appear hypoechoic (darker) when the transducer is angled obliquely. This can be a source of interpretation error for inexperienced practitioners.
Materials science and engineering.
Anisotropy, in materials science, is a material's directional dependence of a physical property. This is a critical consideration for materials selection in engineering applications. A material with physical properties that are symmetric about an axis that is normal to a plane of isotropy is called a transversely isotropic material. Tensor descriptions of material properties can be used to determine the directional dependence of that property. For a monocrystalline material, anisotropy is associated with the crystal symmetry in the sense that more symmetric crystal types have fewer independent coefficients in the tensor description of a given property. When a material is polycrystalline, the directional dependence on properties is often related to the processing techniques it has undergone. A material with randomly oriented grains will be isotropic, whereas materials with texture will be often be anisotropic. Textured materials are often the result of processing techniques like cold rolling, wire drawing, and heat treatment.
Mechanical properties of materials such as Young's modulus, ductility, yield strength, and high-temperature creep rate, are often dependent on the direction of measurement. Fourth-rank tensor properties, like the elastic constants, are anisotropic, even for materials with cubic symmetry. The Young's modulus relates stress and strain when an isotropic material is elastically deformed; to describe elasticity in an anisotropic material, stiffness (or compliance) tensors are used instead.
In metals, anisotropic elasticity behavior is present in all single crystals with three independent coefficients for cubic crystals, for example. For face-centered cubic materials such as nickel and copper, the stiffness is highest along the <111> direction, normal to the close-packed planes, and smallest parallel to <100>. Tungsten is so nearly isotropic at room temperature that it can be considered to have only two stiffness coefficients; aluminium is another metal that is nearly isotropic.
For an isotropic material, formula_1 where formula_2 is the shear modulus, formula_3 is the Young's modulus, and formula_4 is the material's Poisson's ratio. Therefore, for cubic materials, we can think of anisotropy, formula_5, as the ratio between the empirically determined shear modulus for the cubic material and its (isotropic) equivalent:
formula_6
The latter expression is known as the Zener ratio, formula_5, where formula_8 refers to elastic constants in Voigt (vector-matrix) notation. For an isotropic material, the ratio is one.
Limitation of the Zener ratio to cubic materials is waived in the Tensorial anisotropy index AT that takes into consideration all the 27 components of the fully anisotropic stiffness tensor. It is composed of two major parts formula_9and formula_10, the former referring to components existing in cubic tensor and the latter in anisotropic tensor so that formula_11 This first component includes the modified Zener ratio and additionally accounts for directional differences in the material, which exist in orthotropic material, for instance. The second component of this index formula_10 covers the influence of stiffness coefficients that are nonzero only for non-cubic materials and remains zero otherwise.
Fiber-reinforced or layered composite materials exhibit anisotropic mechanical properties, due to orientation of the reinforcement material. In many fiber-reinforced composites like carbon fiber or glass fiber based composites, the weave of the material (e.g. unidirectional or plain weave) can determine the extent of the anisotropy of the bulk material. The tunability of orientation of the fibers allows for application-based designs of composite materials, depending on the direction of stresses applied onto the material.
Amorphous materials such as glass and polymers are typically isotropic. Due to the highly randomized orientation of macromolecules in polymeric materials, polymers are in general described as isotropic. However, mechanically gradient polymers can be engineered to have directionally dependent properties through processing techniques or introduction of anisotropy-inducing elements. Researchers have built composite materials with aligned fibers and voids to generate anisotropic hydrogels, in order to mimic hierarchically ordered biological soft matter. 3D printing, especially Fused Deposition Modeling, can introduce anisotropy into printed parts. This is because FDM is designed to extrude and print layers of thermoplastic materials. This creates materials that are strong when tensile stress is applied in parallel to the layers and weak when the material is perpendicular to the layers.
Microfabrication.
Anisotropic etching techniques (such as deep reactive-ion etching) are used in microfabrication processes to create well defined microscopic features with a high aspect ratio. These features are commonly used in MEMS (microelectromechanical systems) and microfluidic devices, where the anisotropy of the features is needed to impart desired optical, electrical, or physical properties to the device. Anisotropic etching can also refer to certain chemical etchants used to etch a certain material preferentially over certain crystallographic planes (e.g., KOH etching of silicon [100] produces pyramid-like structures)
Neuroscience.
Diffusion tensor imaging is an MRI technique that involves measuring the fractional anisotropy of the random motion (Brownian motion) of water molecules in the brain. Water molecules located in fiber tracts are more likely to move anisotropically, since they are restricted in their movement (they move more in the dimension parallel to the fiber tract rather than in the two dimensions orthogonal to it), whereas water molecules dispersed in the rest of the brain have less restricted movement and therefore display more isotropy. This difference in fractional anisotropy is exploited to create a map of the fiber tracts in the brains of the individual.
Remote sensing and radiative transfer modeling.
Radiance fields (see Bidirectional reflectance distribution function (BRDF)) from a reflective surface are often not isotropic in nature. This makes calculations of the total energy being reflected from any scene a difficult quantity to calculate. In remote sensing applications, anisotropy functions can be derived for specific scenes, immensely simplifying the calculation of the net reflectance or (thereby) the net irradiance of a scene.
For example, let the BRDF be formula_13 where 'i' denotes incident direction and 'v' denotes viewing direction (as if from a satellite or other instrument). And let P be the Planar Albedo, which represents the total reflectance from the scene.
formula_14
formula_15
It is of interest because, with knowledge of the anisotropy function as defined, a measurement of the BRDF from a single viewing direction (say, formula_16) yields a measure of the total scene reflectance (planar albedo) for that specific incident geometry (say, formula_17).
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Alpha decay
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Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus). The parent nucleus transforms or "decays" into a daughter product, with a mass number that is reduced by four and an atomic number that is reduced by two. An alpha particle is identical to the nucleus of a helium-4 atom, which consists of two protons and two neutrons. It has a charge of and a mass of , and is represented as formula_1. For example, uranium-238 undergoes alpha decay to form thorium-234.
While alpha particles have a charge , this is not usually shown because a nuclear equation describes a nuclear reaction without considering the electrons – a convention that does not imply that the nuclei necessarily occur in neutral atoms.
Alpha decay typically occurs in the heaviest nuclides. Theoretically, it can occur only in nuclei somewhat heavier than nickel (element 28), where the overall binding energy per nucleon is no longer a maximum and the nuclides are therefore unstable toward spontaneous fission-type processes. In practice, this mode of decay has only been observed in nuclides considerably heavier than nickel, with the lightest known alpha emitter being the second lightest isotope of antimony, 104Sb. Exceptionally, however, beryllium-8 decays to two alpha particles.
Alpha decay is by far the most common form of cluster decay, where the parent atom ejects a defined daughter collection of nucleons, leaving another defined product behind. It is the most common form because of the combined extremely high nuclear binding energy and relatively small mass of the alpha particle. Like other cluster decays, alpha decay is fundamentally a quantum tunneling process. Unlike beta decay, it is governed by the interplay between both the strong nuclear force and the electromagnetic force.
Alpha particles have a typical kinetic energy of 5 MeV (or ≈ 0.13% of their total energy, 110 TJ/kg) and have a speed of about 15,000,000 m/s, or 5% of the speed of light. There is surprisingly small variation around this energy, due to the strong dependence of the half-life of this process on the energy produced. Because of their relatively large mass, the electric charge of and relatively low velocity, alpha particles are very likely to interact with other atoms and lose their energy, and their forward motion can be stopped by a few centimeters of air.
Approximately 99% of the helium produced on Earth is the result of the alpha decay of underground deposits of minerals containing uranium or thorium. The helium is brought to the surface as a by-product of natural gas production.
History.
Alpha particles were first described in the investigations of radioactivity by Ernest Rutherford in 1899, and by 1907 they were identified as He2+ ions.
By 1928, George Gamow had solved the theory of alpha decay via tunneling. The alpha particle is trapped inside the nucleus by an attractive nuclear potential well
and a repulsive electromagnetic potential barrier. Classically, it is forbidden to escape, but according to the (then) newly discovered principles of quantum mechanics, it has a tiny (but non-zero) probability of "tunneling" through the barrier and appearing on the other side to escape the nucleus. Gamow solved a model potential for the nucleus and derived, from first principles, a relationship between the half-life of the decay, and the energy of the emission, which had been previously discovered empirically and was known as the Geiger–Nuttall law.
Mechanism.
The nuclear force holding an atomic nucleus together is very strong, in general much stronger than the repulsive electromagnetic forces between the protons. However, the nuclear force is also short-range, dropping quickly in strength beyond about 3 femtometers, while the electromagnetic force has an unlimited range. The strength of the attractive nuclear force keeping a nucleus together is thus proportional to the number of the nucleons, but the total disruptive electromagnetic force of proton-proton repulsion trying to break the nucleus apart is roughly proportional to the square of its atomic number. A nucleus with 210 or more nucleons is so large that the strong nuclear force holding it together can just barely counterbalance the electromagnetic repulsion between the protons it contains. Alpha decay occurs in such nuclei as a means of increasing stability by reducing size.
One curiosity is why alpha particles, helium nuclei, should be preferentially emitted as opposed to other particles like a single proton or neutron or other atomic nuclei. Part of the reason is the high binding energy of the alpha particle, which means that its mass is less than the sum of the masses of two free protons and two free neutrons. This increases the disintegration energy. Computing the total disintegration energy given by the equation
formula_2
where is the initial mass of the nucleus, is the mass of the nucleus after particle emission, and is the mass of the emitted (alpha-)particle, one finds that in certain cases it is positive and so alpha particle emission is possible, whereas other decay modes would require energy to be added. For example, performing the calculation for uranium-232 shows that alpha particle emission releases 5.4 MeV of energy, while a single proton emission would "require" 6.1 MeV. Most of the disintegration energy becomes the kinetic energy of the alpha particle, although to fulfill conservation of momentum, part of the energy goes to the recoil of the nucleus itself (see atomic recoil). However, since the mass numbers of most alpha-emitting radioisotopes exceed 210, far greater than the mass number of the alpha particle (4), the fraction of the energy going to the recoil of the nucleus is generally quite small, less than 2%. Nevertheless, the recoil energy (on the scale of keV) is still much larger than the strength of chemical bonds (on the scale of eV), so the daughter nuclide will break away from the chemical environment the parent was in. The energies and ratios of the alpha particles can be used to identify the radioactive parent via alpha spectrometry.
These disintegration energies, however, are substantially smaller than the repulsive potential barrier created by the interplay between the strong nuclear and the electromagnetic force, which prevents the alpha particle from escaping. The energy needed to bring an alpha particle from infinity to a point near the nucleus just outside the range of the nuclear force's influence is generally in the range of about 25 MeV. An alpha particle within the nucleus can be thought of as being inside a potential barrier whose walls are 25 MeV above the potential at infinity. However, decay alpha particles only have energies of around 4 to 9 MeV above the potential at infinity, far less than the energy needed to overcome the barrier and escape.
Quantum tunneling.
Quantum mechanics, however, allows the alpha particle to escape via quantum tunneling. The quantum tunneling theory of alpha decay, independently developed by George Gamow and by Ronald Wilfred Gurney and Edward Condon in 1928, was hailed as a very striking confirmation of quantum theory. Essentially, the alpha particle escapes from the nucleus not by acquiring enough energy to pass over the wall confining it, but by tunneling through the wall. Gurney and Condon made the following observation in their paper on it:
It has hitherto been necessary to postulate some special arbitrary 'instability' of the nucleus, but in the following note, it is pointed out that disintegration is a natural consequence of the laws of quantum mechanics without any special hypothesis... Much has been written of the explosive violence with which the α-particle is hurled from its place in the nucleus. But from the process pictured above, one would rather say that the α-particle almost slips away unnoticed.
The theory supposes that the alpha particle can be considered an independent particle within a nucleus, that is in constant motion but held within the nucleus by strong interaction. At each collision with the repulsive potential barrier of the electromagnetic force, there is a small non-zero probability that it will tunnel its way out. An alpha particle with a speed of 1.5×107 m/s within a nuclear diameter of approximately 10−14 m will collide with the barrier more than 1021 times per second. However, if the probability of escape at each collision is very small, the half-life of the radioisotope will be very long, since it is the time required for the total probability of escape to reach 50%. As an extreme example, the half-life of the isotope bismuth-209 is .
The isotopes in beta-decay stable isobars that are also stable with regards to double beta decay with mass number "A" = 5, "A" = 8, 143 ≤ "A" ≤ 155, 160 ≤ "A" ≤ 162, and "A" ≥ 165 are theorized to undergo alpha decay. All other mass numbers (isobars) have exactly one theoretically stable nuclide. Those with mass 5 decay to helium-4 and a proton or a neutron, and those with mass 8 decay to two helium-4 nuclei; their half-lives (helium-5, lithium-5, and beryllium-8) are very short, unlike the half-lives for all other such nuclides with "A" ≤ 209, which are very long. (Such nuclides with "A" ≤ 209 are primordial nuclides except 146Sm.)
Working out the details of the theory leads to an equation relating the half-life of a radioisotope to the decay energy of its alpha particles, a theoretical derivation of the empirical Geiger–Nuttall law.
Uses.
Americium-241, an alpha emitter, is used in smoke detectors. The alpha particles ionize air in an open ion chamber and a small current flows through the ionized air. Smoke particles from the fire that enter the chamber reduce the current, triggering the smoke detector's alarm.
Radium-223 is also an alpha emitter. It is used in the treatment of skeletal metastases (cancers in the bones).
Alpha decay can provide a safe power source for radioisotope thermoelectric generators used for space probes and were used for artificial heart pacemakers. Alpha decay is much more easily shielded against than other forms of radioactive decay.
Static eliminators typically use polonium-210, an alpha emitter, to ionize the air, allowing the "static cling" to dissipate more rapidly.
Toxicity.
Highly charged and heavy, alpha particles lose their several MeV of energy within a small volume of material, along with a very short mean free path. This increases the chance of double-strand breaks to the DNA in cases of internal contamination, when ingested, inhaled, injected or introduced through the skin. Otherwise, touching an alpha source is typically not harmful, as alpha particles are effectively shielded by a few centimeters of air, a piece of paper, or the thin layer of dead skin cells that make up the epidermis; however, many alpha sources are also accompanied by beta-emitting radio daughters, and both are often accompanied by gamma photon emission.
Relative biological effectiveness (RBE) quantifies the ability of radiation to cause certain biological effects, notably either cancer or cell-death, for equivalent radiation exposure. Alpha radiation has a high linear energy transfer (LET) coefficient, which is about one ionization of a molecule/atom for every angstrom of travel by the alpha particle. The RBE has been set at the value of 20 for alpha radiation by various government regulations. The RBE is set at 10 for neutron irradiation, and at 1 for beta radiation and ionizing photons.
However, the recoil of the parent nucleus (alpha recoil) gives it a significant amount of energy, which also causes ionization damage (see ionizing radiation). This energy is roughly the weight of the alpha () divided by the weight of the parent (typically about 200 Da) times the total energy of the alpha. By some estimates, this might account for most of the internal radiation damage, as the recoil nucleus is part of an atom that is much larger than an alpha particle, and causes a very dense trail of ionization; the atom is typically a heavy metal, which preferentially collect on the chromosomes. In some studies, this has resulted in an RBE approaching 1,000 instead of the value used in governmental regulations.
The largest natural contributor to public radiation dose is radon, a naturally occurring, radioactive gas found in soil and rock. If the gas is inhaled, some of the radon particles may attach to the inner lining of the lung. These particles continue to decay, emitting alpha particles, which can damage cells in the lung tissue. The death of Marie Curie at age 66 from aplastic anemia was probably caused by prolonged exposure to high doses of ionizing radiation, but it is not clear if this was due to alpha radiation or X-rays. Curie worked extensively with radium, which decays into radon, along with other radioactive materials that emit beta and gamma rays. However, Curie also worked with unshielded X-ray tubes during World War I, and analysis of her skeleton during a reburial showed a relatively low level of radioisotope burden.
The Russian defector Alexander Litvinenko's 2006 murder by radiation poisoning is thought to have been carried out with polonium-210, an alpha emitter.
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Extreme poverty
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Extreme poverty is the most severe type of poverty, defined by the United Nations (UN) as "a condition characterized by severe deprivation of basic human needs, including food, safe drinking water, sanitation facilities, health, shelter, education and information. It depends not only on income but also on access to services". Historically, other definitions have been proposed within the United Nations.
Extreme poverty mainly refers to an income below the international poverty line of $1.90 per day in 2018 ($ in dollars), set by the World Bank. This is the equivalent of $1.00 a day in 1996 US prices, hence the widely used expression "living on less than a dollar a day". The vast majority of those in extreme poverty reside in South Asia and Sub-Saharan Africa. As of 2018, it is estimated that the country with the most people living in extreme poverty is Nigeria, at 86 million.
In the past, the vast majority of the world population lived in conditions of extreme poverty.
The percentage of the global population living in absolute poverty fell from over 80% in 1800 to around 10% by 2015. According to UN estimates, roughly 734 million people or 10% remained under those conditions. The number had previously been measured as 1.9 billion in 1990, and 1.2 billion in 2008. Despite the significant number of individuals still below the international poverty line, these figures represent significant progress for the international community, as they reflect a decrease of more than one billion people over 15 years.
In public opinion surveys around the globe, people surveyed tend to think that extreme poverty has not decreased.
The reduction of extreme poverty and hunger was the first Millennium Development Goal (MDG1), as set by the United Nations in 2000. Specifically, the target was to reduce the extreme poverty rate by half by 2015, a goal that was met five years ahead of schedule. In the Sustainable Development Goals, which succeeded the MDGs, the goal is to end extreme poverty in all its forms everywhere. With this declaration the international community, including the UN and the World Bank have adopted the target of ending extreme poverty by 2030.
Definition.
Previous definitions.
In July 1993, Leandro Despouy, the then UN Special Rapporteur on extreme poverty and human rights made use of a definition he adapted from a 1987 report to the French Economic and Social Council by Fr. Joseph Wresinski, founder of the International Movement ATD Fourth World, distinguishing "lack of basic security" (poverty) and "chronic poverty" (extreme poverty), linking the eradication of extreme poverty by allowing people currently experiencing it a real opportunity to exercise all their human rights:
This definition was mentioned previously, in June 1989, in the preliminary report on the realization of economic, social and cultural rights by the UN Special Rapporteur Danilo Türk. It is still in use today, among others, in the current UN Guiding Principles on Extreme Poverty and Human Rights adopted by the UN Human Rights Council in September 2012.
Consumption-based definition.
Extreme poverty is defined by the international community as living below $1.90 a day, as measured in 2011 international prices (equivalent to $2.12 in 2018). This number, also known as the international poverty line, is periodically updated to account for inflation and differences in the cost of living; it was originally defined at $1.00 a day in 1996. The updates are made according to new price data to portray the costs of basic food, health services, clothing, and shelter around the world as accurately as possible. The latest revision was made in 2015 when the World Bank increased the line to international-$1.90.
Because many of the world's poorest people do not have a monetary income, the poverty measurement is based on the monetary value of a person's "consumption". Otherwise the poverty measurement would be missing the home production of subsistence farmers that consume largely their own production.
Alternative definitions.
The $1.90/day extreme poverty line remains the most widely used metric as it highlights the reality of those in the most severe conditions. Although widely used by most international organizations, it has come under scrutiny due to a variety of factors. For example, it does not account for how far below the line people are, referred to as the depth of poverty. For this purpose, the same institutions publish data on the poverty gap.
The international poverty line is designed to stay constant over time, to allow comparisons between different years. It is therefore a measure of absolute poverty and is not measuring relative poverty. It is also not designed to capture how people view their own financial situation (known as the socially subjective poverty line). Moreover, the calculation of the poverty line relies on information about consumer prices to calculate purchasing power parity, which are very hard to measure and are necessarily debatable. As with all other metrics, there may also be missing data from the poorest and most fragile countries.
Several alternative instruments for measuring extreme poverty have been suggested which incorporate other factors such as malnutrition and lack of access to a basic education. The Multidimensional Poverty Index (MPI), based on the Alkire-Foster Method, is published by the Oxford Poverty & Human Development Initiative (OPHI): it measures deprivation in basic needs and can be broken down to reflect both the incidence and the intensity of poverty. For example, under conventional measures, in both Ethiopia and Uzbekistan about 40% of the population is considered extremely poor, but based on the MPI, 90% of Ethiopians but only 2% of Uzbeks are in multidimensional poverty.
The MPI is useful for development officials to determine the most likely causes of poverty within a region, using the M0 measure of the method (which is calculated by multiplying the fraction of people in poverty by the fraction of dimensions they are deprived in). For example, in the Gaza Strip of Palestine, using the M0 measure of the Alkire-Foster method reveals that poverty in the region is primarily caused by a lack of access to electricity, lack of access to drinking water, and widespread overcrowding. In contrast, data from the Chhukha District of Bhutan reveals that income is a much larger contributor to poverty as opposed to other dimensions within the region. However, the MPI only presents data from 105 countries, so it cannot be used for global measurements.
Current trends.
Getting to zero.
Using the World Bank definition of $1.90/day, , roughly 710 million people remained in extreme poverty (or roughly 1 in 10 people worldwide). Nearly half of them live in India and China, with more than 85% living in just 20 countries. Since the mid-1990s, there has been a steady decline in both the worldwide poverty rate and the total number of extreme poor. In 1990, the percentage of the global population living in extreme poverty was 43%, but in 2011, that percentage had dropped down to 21%. This halving of the extreme poverty rate falls in line with the first Millennium Development Goal (MDG1) proposed by former UN Secretary-General Kofi Annan, who called on the international community at the turn of the century to reduce the percentage of people in extreme poverty by half by 2015.
This reduction in extreme poverty took place most notably in China, Indonesia, India, Pakistan and Vietnam. These five countries accounted for the alleviation of 715 million people out of extreme poverty between 1990 and 2010 – more than the global net total of roughly 700 million. This statistical oddity can be explained by the fact that the number of people living in extreme poverty in Sub-Saharan Africa rose from 290 million to 414 million over the same period. However, there have been many positive signs for extensive, global poverty reduction as well. Since 1999, the total number of extreme poor has declined by an average of 50 million per year. Moreover, in 2005, for the first time in recorded history, poverty rates began to fall in every region of the world, including Africa.
As aforementioned, the number of people living in extreme poverty has reduced from 1.9 billion to 766 million over the span of the last decades. If we remain on our current trajectory, many economists predict we could reach global zero by 2030–2035, thus ending extreme poverty. Global zero entails a world in which fewer than 3% of the global population lives in extreme poverty (projected under most optimistic scenarios to be fewer than 200 million people). This zero figure is set at 3% in recognition of the fact that some amount of frictional (temporary) poverty will continue to exist, whether it is caused by political conflict or unexpected economic fluctuations, at least for the foreseeable future. However, the Brookings Institution notes that any projection about poverty more than a few years into the future runs the risk of being highly uncertain. This is because changes in consumption and distribution throughout the developing world over the next two decades could result in monumental shifts in global poverty, for better or worse.
Others are more pessimistic about this possibility, predicting a range of 193 million to 660 million people still living in extreme poverty by 2035. Additionally, some believe the rate of poverty reduction will slow down in the developing world, especially in Africa, and as such it will take closer to five decades to reach global zero. Despite these reservations, several prominent international and national organizations, including the UN, the World Bank and the United States Federal Government (via USAID), have set a target of reaching global zero by the end of 2030.
More recent analyses in 2022 on real wages have questioned whether extreme poverty was a "natural" condition of humanity and decreased with the rise of capitalism.
Exacerbating factors.
There are a variety of factors that may reinforce or instigate the existence of extreme poverty, such as weak institutions, cycles of violence and a low level of growth. Recent World Bank research shows that some countries can get caught in a "fragility trap", in which self-reinforcing factors prevent the poorest nations from emerging from low-level equilibrium in the long run. Moreover, most of the reduction in extreme poverty over the past twenty years has taken place in countries that have not experienced a civil conflict or have had governing institutions with a strong capacity to actually govern. Thus, to end extreme poverty, it is also important to focus on the interrelated problems of fragility and conflict.
USAID defines fragility as a government's lack of both legitimacy (the perception the government is adequate at doing its job) and effectiveness (how good the government is at maintaining law and order, in an equitable manner). As fragile nations are unable to equitably and effectively perform the functions of a state, these countries are much more prone to violent unrest and mass inequality. Additionally, in countries with high levels of inequality (a common problem in countries with inadequate governing institutions), much higher growth rates are needed to reduce the rate of poverty when compared with other nations. Additionally, if China and India are removed from the equation, up to 70% of the world's poor live in fragile states by some definitions of fragility. Some analysts project that extreme poverty will be increasingly concentrated in fragile, low-income states like Haiti, Yemen and the Central African Republic. However, some academics, such as Andy Sumner, say that extreme poverty will be increasingly concentrated in middle-income countries, creating a paradox where the world's poor do not actually live in the poorest countries.
To help low-income earners, fragile states make the transition towards peace and prosperity, the New Deal for Engagement in Fragile States, endorsed by roughly forty countries and multilateral institutions, was created in 2011. This represents an important step towards redressing the problem of fragility as it was originally articulated by self-identified fragile states who called on the international community to not only "do things differently", but to also "do different things".
Civil conflict also remains a prime cause for the perpetuation of poverty throughout the developing world. Armed conflict can have severe effects on economic growth for many reasons such as the destruction of assets, destruction of livelihoods, creation of unwanted mass migration, and diversion of public resources towards war. Significantly, a country that experienced major violence during 1981–2005 had extreme poverty rates 21 percentage points higher than a country with no violence. On average, each civil conflict will cost a country roughly 30 years of GDP growth. Therefore, a renewed commitment from the international community to address the deteriorating situation in highly fragile states is necessary to both prevent the mass loss of life, but to also prevent the vicious cycle of extreme poverty.
Population trends and dynamics (e.g. population growth) can also have a large impact on prospects for poverty reduction. According to the United Nations, "in addition to improving general health and well-being, analysis shows that meeting the reproductive health and contraceptive needs of all women in the developing world more than pays for itself").
In 2013, a prominent finding in a report by the World Bank was that extreme poverty is most prevalent in low-income countries. In these countries, the World Bank found that progress in poverty reduction is the slowest, the poor live under the worst conditions, and the most affected persons are children age 12 and under.
International initiatives.
Millennium Summit and Millennium Development Goals.
In September 2000, world leaders gathered at the Millennium Summit held in New York, launching the United Nations Millennium Project suggested by then UN Secretary-General Kofi Annan. Prior to the launch of the conference, the office of Secretary-General Annan released a report entitled "We The Peoples: The Role of the United Nations in the 21st Century". In this document, now widely known as the Millennium Report, Kofi Annan called on the international community to reduce the proportion of people in extreme poverty by half by 2015, a target that would affect over 1 billion people. Citing the close correlation between economic growth and the reduction of poverty in poor countries, Annan urged international leaders to indiscriminately target the problem of extreme poverty across every region. In charge of managing the project was Jeffrey Sachs, a noted development economist, who in 2005 released a plan for action called "Investing in Development: A Practical Plan to Achieve the Millennium Development Goals". Thomas Pogge criticized the 2000 Millennium Declaration for being less ambitious than a previous declaration from the World Food Summit due to using 1990 as the benchmark rather than 1996.
Overall, there has been significant progress towards reducing extreme poverty, with the MDG1 target of reducing extreme poverty rates by half being met five years early, representing 700 million people being lifted out of extreme poverty from 1990 to 2010, with 1.2 billion people still remaining under those conditions. The notable exception to this trend was in Sub-Saharan Africa, the only region where the number of people living in extreme poverty rose from 290 million in 1990 to 414 million in 2010, comprising more than a third of those living in extreme poverty worldwide.
2005 World Summit.
The 2005 World Summit, held in September which was organized to measure international progress towards fulfilling the Millennium Development Goals (MDGs). Notably, the conference brought together more than 170 Heads of State. While world leaders at the summit were encouraged by the reduction of poverty in some nations, they were concerned by the uneven decline of poverty within and among different regions of the globe. However, at the end of the summit, the conference attendees reaffirmed the UN's commitment to achieve the MDGs by 2015 and urged all supranational, national and non-governmental organizations to follow suit.
Sustainable Development Goals.
As the expiration of the Millennium Development Goals approached in 2015, the UN convened a panel to advise on a Post-2015 Development Agenda, which led to a new set of 17 goals for 2030 titled the Sustainable Development Goals (SDGs). The first goal (SDG 1) is to "End poverty in all its forms everywhere."
The HLP report, entitled A New Global Partnership: Eradicate Poverty and Transform Economies Through Sustainable Development, was published in May 2013. In the report, the HLP wrote that:
Ending extreme poverty is just the beginning, not the end. It is vital, but our vision must be broader: to start countries on the path of sustainable development – building on the foundations established by the 2012 UN Conference on Sustainable Development in Rio de Janeiro, and meeting a challenge that no country, developed or developing, has met so far. We recommend to the Secretary-General that deliberations on a new development agenda must be guided by the vision of eradicating extreme poverty once and for all, in the context of sustainable development.
Therefore, the report determined that a central goal of the Post-Millennium Development agenda is to eradicate extreme poverty by 2030. However, the report also emphasized that the MDGs were not enough on their own, as they did not "focus on the devastating effects of conflict and violence on development ... the importance to development of good governance and institution ... nor the need for inclusive growth..." Consequently, there now exists synergy between the policy position papers put forward by the United States (through USAID), the World Bank and the UN itself in terms of viewing fragility and a lack of good governance as exacerbating extreme poverty. However, in a departure from the views of other organizations, the commission also proposed that the UN focus not only on extreme poverty (a line drawn at $1.25), but also on a higher target, such as $2. The report notes this change could be made to reflect the fact that escaping extreme poverty is only a first step.
In addition to the UN, a host of other supranational and national actors such as the European Union and the African Union have published their own positions or recommendations on what should be incorporated in the Post-2015 agenda. The European Commission's communication, published in A decent Life for all: from vision to collective action, affirmed the UN's commitment to "eradicate extreme poverty in our lifetime and put the world on a sustainable path to ensure a decent life for all by 2030". A unique vision of the report was the commission's environmental focus (in addition to a plethora of other goals such as combating hunger and gender inequality). Specifically, the Commission argued, "long-term poverty reduction ... requires inclusive and sustainable growth. Growth should create decent jobs, take place with resource efficiency and within planetary boundaries, and should support efforts to mitigate climate change." The African Union's report, entitled Common African Position (CAP) on the Post-2015 Development Agenda, likewise encouraged the international community to focus on eradicating the twin problems of poverty and exclusion in our lifetime. Moreover, the CAP pledged that "no person – regardless of ethnicity, gender, geography, disability, race or other status – is denied universal human rights and basic economic opportunities".
Least developed country conferences.
The UN least developed country (LDC) conferences were a series of summits organized by the UN to promote the substantial and even development of the world's least developed countries.
Organizations working to end extreme poverty.
International organizations.
World Bank.
In 2013, the Board of Governors of the World Bank Group (WBG) set two overriding goals for the WBG to commit itself to in the future. First, to end extreme poverty by 2030, an objective that echoes the sentiments of the UN and the Obama administration. Additionally, the WBG set an interim target of reducing extreme poverty to below 9% by 2020. Second, to focus on growth among the bottom 40% of people, as opposed to standard GDP growth. This commitment ensures that the growth of the developing world lifts people out of poverty, rather than exacerbating inequality.
As the World Bank's primary focus is on delivering economic growth to enable equitable prosperity, its developments programs are primarily commercial-based in nature, as opposed to the UN. Since the World Bank recognizes better jobs will result in higher income, and thus less poverty, the WBG seeks to support employment training initiatives, small business development programs and strong labor protection laws. However, since much of the growth in the developing world has been inequitable, the World Bank has also begun teaming with client states to map out trends in inequality and to propose public policy changes that can level the playing field.
Moreover, the World Bank engages in a variety of nutritional, transfer payments and transport-based initiatives. Children who experience under-nutrition from conception to two years of age have a much higher risk of physical and mental disability. Thus, they are often trapped in poverty and are unable to make a full contribution to the social and economic development of their communities as adults. The WBG estimates that as much as 3% of GDP can be lost as a result of under-nutrition among the poorest nations. To combat undernutrition, the WBG has partnered with UNICEF and the WHO to ensure all small children are fully fed. The WBG also offers conditional cash transfers to poor households who meet certain requirements such as maintaining children's healthcare or ensuring school attendance. Finally, the WBG understands investment in public transportation and better roads is key to breaking rural isolation, improving access to healthcare and providing better job opportunities for the World's poor.
United Nations.
The UN Office for the Coordination of Humanitarian Affairs (OCHA) works to synchronize the disparate international, national and non-governmental efforts to contest poverty. OCHA seeks to prevent "confusion" in relief operations and to ensure that the humanitarian response to disaster situations has greater accountability and predictability. To do so, OCHA has begun deploying Humanitarian Coordinators and Country Teams to provide a solid architecture for the international community to work through.
The United Nation's Children's Fund (UNICEF) was created by the UN to provide food, clothing and healthcare to European children facing famine and disease in the immediate aftermath of World War II. After the UN General Assembly extended UNICEF's mandate indefinitely in 1953, it actively worked to help children in extreme poverty in more than 190 countries and territories to overcome the obstacles that poverty, violence, disease and discrimination place in a child's path. Its current focus areas are 1) Child survival & development 2) Basic education & gender equality 3) Children and HIV/AIDS and 4) Child protection.
The UN Refugee Agency (UNHCR) is mandated to lead and coordinate international action to protect refugees worldwide. Its primary purpose is to safeguard the rights of refugees by ensuring anyone can exercise the right to seek asylum in another state, with the option to return home voluntarily, integrate locally or resettle in a third country. The UNHCR operates in over 125 countries, helping approximately 33.9 million persons.
The World Food Programme (WFP) is the largest agency dedicated to fighting hunger worldwide. On average, the WFP brings food assistance to more than 90 million people in 75 countries. The WFP not only strives to prevent hunger in the present, but also in the future by developing stronger communities which will make food even more secure on their own. The WFP has a range of expertise from Food Security Analysis, Nutrition, Food Procurement and Logistics.
The World Health Organization (WHO) is responsible for providing leadership on global health matters, shaping the health research agenda, articulating evidence-based policy decisions and combating diseases that are induced from poverty, such as HIV/AIDS, malaria and tuberculosis. Moreover, the WHO deals with pressing issues ranging from managing water safety, to dealing with maternal and newborn health.
Governmental agencies.
USAID.
The US Agency for International Development (USAID) is the lead US government agency dedicated to ending extreme poverty. Currently the largest bilateral donor in the world, the United States channels the majority of its development assistance through USAID and the US Department of State. In President Obama's 2013 State of the Union address, he declared, "So the United States will join with our allies to eradicate such extreme poverty in the next two decades ... which is within our reach." In response to Obama's call to action, USAID has made ending extreme poverty central to its mission statement. Under its New Model of Development, USAID seeks to eradicate extreme poverty through the use of innovation in science and technology, by putting a greater emphasis on evidence based decision-making, and through leveraging the ingenuity of the private sector and global citizens.
A major initiative of the Obama administration is Power Africa, which aims to bring energy to 20 million people in Sub-Saharan Africa. By reaching out to its international partners, whether commercial or public, the US has leveraged over $14 billion in outside commitments after investing only US$7 billion of its own. To ensure that Power Africa reaches the region's poorest, the initiative engages in a transaction based approach to create systematic change. This includes expanding access to electricity to more than 20,000 additional households which already live without power.
In terms of specific programming, USAID works in a variety of fields from preventing hunger, reducing HIV/AIDS, providing general health assistance and democracy assistance, as well as dealing with gender issues. To deal with food security, which affects roughly 842 million people (who go to bed hungry each night), USAID coordinates the Feed the Future Initiative (FtF). FtF aims to reduce poverty and under-nutrition each by 20% over five years. Because of the President's Emergency Plan for AIDS Relief (PEPFAR) and a variety of congruent actors, the incidence of AIDS and HIV, which used to ravage Africa, reduced in scope and intensity. Through PEPFAR, the United States has ensured over five million people have received life-saving antiviral drugs, a significant proportion of the eight million people receiving treatment in relatively poor nations.
In terms of general health assistance, USAID has worked to reduce maternal mortality by 30%, under-five child mortality by 35%, and has accomplished a host of other goals. USAID also supports the gamut of democratic initiatives, from promoting human rights and accountable, fair governance, to supporting free and fair elections and the rule of law. In pursuit of these goals, USAID has increased global political participation by training more than 9,800 domestic election observers and providing civic education to more than 6.5 million people. Since 2012, the Agency has begun integrating critical gender perspectives across all aspects of its programming to ensure all USAID initiatives work to eliminate gender disparities. To do so, USAID seeks to increase the capability of women and girls to realize their rights and determine their own life outcomes. Moreover, USAID supports additional programs to improve women's access to capital and markets, builds theirs skills in agriculture, and supports women's desire to own businesses.
Others.
Other major government development agencies with annual aid programmes of more than $10 billion include: GIZ (Germany), FCDO (United Kingdom), JICA (Japan), European Union and AFD (France).
Non-Governmental Organizations.
A multitude of non-governmental organizations operate in the field of extreme poverty, actively working to alleviate the poorest of the poor of their deprivation. To name but a few notable organizations: Save the Children, the Overseas Development Institute, Concern Worldwide, ONE, Trickle Up and Oxfam have all done a considerable amount of work in extreme poverty.
Save the Children is the leading international organization dedicated to helping the world's indigent children. In 2013, Save the Children reached over 143 million children through their work, including over 52 million children directly. Save the Children also recently released their own report titled "Getting to Zero", in which they argued the international community could feasibly do more than lift the world's poor above $1.25/day.
The Overseas Development Institute (ODI) is a UK based think tank on international development and humanitarian issues. ODI is dedicated to alleviating the suffering of the world's poor by providing high-quality research and practical policy advice to the World's development officials. ODI also recently released a paper entitled, "The Chronic Poverty Report 2014–2015: The road to zero extreme poverty", in which its authors assert that though the international communities' goal of ending extreme poverty by 2030 is laudable, much more targeted resources will be necessary to reach said target. The report states that "To eradicate extreme poverty, massive global investment is required in social assistance, education and pro-poorest economic growth".
Concern Worldwide is an international humanitarian organization whose mission is to end extreme poverty by influencing decision makers at all levels of government (from local to international). Concern has also produced a report on extreme poverty in which they explain their own conception of extreme poverty from a NGO's standpoint. In this paper, named "How Concern Understands Extreme Poverty", the report's creators write that extreme poverty entails more than just living under $1.25/day, it also includes having a small number of assets and being vulnerable to severe negative shocks (whether natural or man made).
ONE, the organization co-founded by Bono, is a non-profit organization funded almost entirely by foundations, individual philanthropists and corporations. ONE's goals include raising public awareness and working with political leaders to fight preventable diseases, increase government accountability and increase investment in nutrition. Finally, Trickle Up is a micro-enterprise development program targeted at those living on under $1.25/day, which provides the indigent with resources to build a sustainable livelihood through both direct financing and considerable training efforts.
Oxfam is a non-governmental organization that works prominently in Africa; their mission is to improve local community organizations and it works to reduce impediments to the development of the country. Oxfam helps families suffering from poverty receive food and healthcare to survive. There are many children in Africa experiencing growth stunting, and this is one example of an issue that Oxfam targets and aims to resolve.
Cash transfers appear to be an effective intervention for reducing extreme poverty, while at the same time improving health and education outcomes.<ref name="doi10.1002/14651858.CD011135.pub2"></ref><ref name="doi10.1002/14651858.CD011135.pub3"></ref>
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Analytical engine
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The analytical engine was a proposed digital mechanical general-purpose computer designed by English mathematician and computer pioneer Charles Babbage. It was first described in 1837 as the successor to Babbage's difference engine, which was a design for a simpler mechanical calculator.
The analytical engine incorporated an arithmetic logic unit, control flow in the form of conditional branching and loops, and integrated memory, making it the first design for a general-purpose computer that could be described in modern terms as Turing-complete. In other words, the structure of the analytical engine was essentially the same as that which has dominated computer design in the electronic era. The analytical engine is one of the most successful achievements of Charles Babbage.
Babbage was never able to complete construction of any of his machines due to conflicts with his chief engineer and inadequate funding. It was not until 1941 that Konrad Zuse built the first general-purpose computer, Z3, more than a century after Babbage had proposed the pioneering analytical engine in 1837.
Design.
Babbage's first attempt at a mechanical computing device, the difference engine, was a special-purpose machine designed to tabulate logarithms and trigonometric functions by evaluating finite differences to create approximating polynomials. Construction of this machine was never completed; Babbage had conflicts with his chief engineer, Joseph Clement, and ultimately the British government withdrew its funding for the project.
During this project, Babbage realised that a much more general design, the analytical engine, was possible. The work on the design of the analytical engine started around 1833.
The input, consisting of programs ("formulae") and data, was to be provided to the machine via punched cards, a method being used at the time to direct mechanical looms such as the Jacquard loom. For output, the machine would have a printer, a curve plotter, and a bell. The machine would also be able to punch numbers onto cards to be read in later. It employed ordinary base-10 fixed-point arithmetic.
There was to be a store (that is, a memory) capable of holding 1,000 numbers of 40 decimal digits each (ca. 16.6 kB). An arithmetic unit (the "mill") would be able to perform all four arithmetic operations, plus comparisons and optionally square roots. Initially (1838) it was conceived as a difference engine curved back upon itself, in a generally circular layout, with the long store exiting off to one side. Later drawings (1858) depict a regularised grid layout. Like the central processing unit (CPU) in a modern computer, the mill would rely upon its own internal procedures, roughly equivalent to microcode in modern CPUs, to be stored in the form of pegs inserted into rotating drums called "barrels", to carry out some of the more complex instructions the user's program might specify.
The programming language to be employed by users was akin to modern day assembly languages. Loops and conditional branching were possible, and so the language as conceived would have been Turing-complete as later defined by Alan Turing. Three different types of punch cards were used: one for arithmetical operations, one for numerical constants, and one for load and store operations, transferring numbers from the store to the arithmetical unit or back. There were three separate readers for the three types of cards. Babbage developed some two dozen programs for the analytical engine between 1837 and 1840, and one program later. These programs treat polynomials, iterative formulas, Gaussian elimination, and Bernoulli numbers.
In 1842, the Italian mathematician Luigi Federico Menabrea published a description of the engine in French, based on lectures Babbage gave when he visited Turin in 1840. In 1843, the description was translated into English and extensively annotated by Ada Lovelace, who had become interested in the engine eight years earlier. In recognition of her additions to Menabrea's paper, which included a way to calculate Bernoulli numbers using the machine (widely considered to be the first complete computer program), she has been described by many as the first computer programmer, although others have challenged this view.
Construction.
Late in his life, Babbage sought ways to build a simplified version of the machine, and assembled a small part of it before his death in 1871.
In 1878, a committee of the British Association for the Advancement of Science described the analytical engine as "a marvel of mechanical ingenuity", but recommended against constructing it. The committee acknowledged the usefulness and value of the machine, but could not estimate the cost of building it, and were unsure whether the machine would function correctly after being built.
Intermittently from 1880 to 1910, Babbage's son Henry Prevost Babbage was constructing a part of the mill and the printing apparatus. In 1910, it was able to calculate a (faulty) list of multiples of pi. This constituted only a small part of the whole engine; it was not programmable and had no storage. (Popular images of this section have sometimes been mislabelled, implying that it was the entire mill or even the entire engine.) Henry Babbage's "analytical engine mill" is on display at the Science Museum in London. Henry also proposed building a demonstration version of the full engine, with a smaller storage capacity: "perhaps for a first machine ten (columns) would do, with fifteen wheels in each". Such a version could manipulate 20 numbers of 25 digits each, and what it could be told to do with those numbers could still be impressive. "It is only a question of cards and time", wrote Henry Babbage in 1888, "... and there is no reason why (twenty thousand) cards should not be used if necessary, in an analytical engine for the purposes of the mathematician".
In 1991, the London Science Museum built a complete and working specimen of Babbage's Difference Engine No. 2, a design that incorporated refinements Babbage discovered during the development of the analytical engine. This machine was built using materials and engineering tolerances that would have been available to Babbage, quelling the suggestion that Babbage's designs could not have been produced using the manufacturing technology of his time.
In October 2010, John Graham-Cumming started a "Plan 28" campaign to raise funds by "public subscription" to enable serious historical and academic study of Babbage's plans, with a view to then build and test a fully working virtual design which will then in turn enable construction of the physical analytical engine. As of May 2016, actual construction had not been attempted, since no consistent understanding could yet be obtained from Babbage's original design drawings. In particular it was unclear whether it could handle the indexed variables which were required for Lovelace's Bernoulli program. By 2017, the "Plan 28" effort reported that a searchable database of all catalogued material was available, and an initial review of Babbage's voluminous Scribbling Books had been completed.
Many of Babbage's original drawings have been digitised and are publicly available online.
Instruction set.
Babbage is not known to have written down an explicit set of instructions for the engine in the manner of a modern processor manual. Instead he showed his programs as lists of states during their execution, showing what operator was run at each step with little indication of how the control flow would be guided.
Allan G. Bromley has assumed that the card deck could be read in forwards and backwards directions as a function of conditional branching after testing for conditions, which would make the engine Turing-complete:
...the cards could be ordered to move forward and reverse (and hence to loop)...
The introduction for the first time, in 1845, of user operations for a variety of service functions including, most importantly, an effective system for user control of looping in user programs.
There is no indication how the direction of turning of the operation and variable cards is specified. In the absence of other evidence I have had to adopt the minimal default assumption that both the operation and variable cards can only be turned backward as is necessary to implement the loops used in Babbage's sample programs. There would be no mechanical or microprogramming difficulty in placing the direction of motion under the control of the user.
In their emulator of the engine, Fourmilab say:
The Engine's Card Reader is not constrained to simply process the cards in a chain one after another from start to finish. It can, in addition, directed by the very cards it reads and advised by whether the Mill's run-up lever is activated, either advance the card chain forward, skipping the intervening cards, or backward, causing previously-read cards to be processed once again.
This emulator does provide a written symbolic instruction set, though this has been constructed by its authors rather than based on Babbage's original works. For example, a factorial program would be written as:
N0 6
N1 1
N2 1
L1
L0
S1
L0
L2
S0
L2
L0
CB?11
where the CB is the conditional branch instruction or "combination card" used to make the control flow jump, in this case backward by 11 cards.
Influence.
Predicted influence.
Babbage understood that the existence of an automatic computer would kindle interest in the field now known as algorithmic efficiency, writing in his "Passages from the Life of a Philosopher", "As soon as an analytical engine exists, it will necessarily guide the future course of the science. Whenever any result is sought by its aid, the question will then arise—By what course of calculation can these results be arrived at by the machine in the "shortest time"?"
Computer science.
From 1872, Henry continued diligently with his father's work and then intermittently in retirement in 1875. In 1902 Alexander Rechnitzer relied on mechanical engines from clocks and music boxes to automate multiplication and division using rigid sequences and nested loops. The calculation of the square root was later automated by the Friden Calculating Machine Company.
Percy Ludgate wrote about the engine in 1914 and published his own design for an analytical engine in 1909. It was drawn up in detail, but never built, and the drawings have never been found. Ludgate's engine would be much smaller (about than Babbage's, and hypothetically would be capable of multiplying two 20-decimal-digit numbers in about six seconds.
In his work "Essays on Automatics" (1914) Leonardo Torres Quevedo, inspired by Babbage, designed a theoretical electromechanical calculating machine which was to be controlled by a read-only program. The paper also contains the idea of floating-point arithmetic. In 1920, to celebrate the 100th anniversary of the invention of the arithmometer, Torres presented in Paris the electromechanical arithmometer, which consisted of an arithmetic unit connected to a (possibly remote) typewriter, on which commands could be typed and the results printed automatically.
Vannevar Bush's paper "Instrumental Analysis" (1936) included several references to Babbage's work. In the same year he started the Rapid Arithmetical Machine project to investigate the problems of constructing an electronic digital computer.
Despite this groundwork, Babbage's work fell into historical obscurity, and the analytical engine was unknown to builders of electromechanical and electronic computing machines in the 1930s and 1940s when they began their work, resulting in the need to re-invent many of the architectural innovations Babbage had proposed. Howard Aiken, who built the quickly-obsoleted electromechanical calculator, the Harvard Mark I, between 1937 and 1945, praised Babbage's work likely as a way of enhancing his own stature, but knew nothing of the analytical engine's architecture during the construction of the Mark I, and considered his visit to the constructed portion of the analytical engine "the greatest disappointment of my life". The Mark I showed no influence from the analytical engine and lacked the analytical engine's most prescient architectural feature, conditional branching. J. Presper Eckert and John W. Mauchly similarly were not aware of the details of Babbage's analytical engine work prior to the completion of their design for the first electronic general-purpose computer, the ENIAC.
Comparison to other early computers.
If the analytical engine had been built, it would have been digital, programmable and Turing-complete. It would, however, have been very slow. Luigi Federico Menabrea reported in "Sketch of the Analytical Engine": "Mr. Babbage believes he can, by his engine, form the product of two numbers, each containing twenty figures, in three minutes".
By comparison the Harvard Mark I could perform the same task in just six seconds (though it is debatable that computer is Turing complete; the ENIAC, which is, would also have been faster). A modern CPU could do the same thing in under a billionth of a second.
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Augustus
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Gaius Julius Caesar Augustus (born Gaius Octavius; 23 September 63BC – 19 August AD14), also known as Octavian (), was the founder of the Roman Empire, who reigned as the first Roman emperor from 27BC until his death in AD14. The reign of Augustus initiated an imperial cult and an era of imperial peace (the or ) in which the Roman world was largely free of armed conflict. The Principate system of government was established during his reign and lasted until the Crisis of the Third Century.
Octavian was born into an equestrian branch of the plebeian Octavia. Following his maternal great-uncle Julius Caesar's assassination in 44BC, Octavian was named in Caesar's will as his adopted son and heir, and inherited Caesar's name, estate, and the loyalty of his legions. He, Mark Antony, and Marcus Lepidus formed the Second Triumvirate to defeat the assassins of Caesar. Following their victory at the Battle of Philippi (42BC), the Triumvirate divided the Roman Republic among themselves and ruled as "de facto" dictators. The Triumvirate was eventually torn apart by the competing ambitions of its members; Lepidus was exiled in 36BC, and Antony was defeated by Octavian at the Battle of Actium in 31BC. Antony and his wife Cleopatra, the Ptolemaic queen of Egypt, killed themselves during Octavian's invasion of Egypt, which then became a Roman province.
After the demise of the Second Triumvirate, Augustus restored the outward facade of the free republic, with governmental power vested in the Roman Senate, the executive magistrates and the legislative assemblies, yet he maintained autocratic authority by having the Senate grant him lifetime tenure as commander-in-chief, tribune and censor. A similar ambiguity is seen in his chosen names, the implied rejection of monarchical titles whereby he called himself 'First Citizen' juxtaposed with his adoption of the name Augustus.
Augustus dramatically enlarged the empire, annexing Egypt, Dalmatia, Pannonia, Noricum, and Raetia, expanding possessions in Africa, and completing the conquest of Hispania, but he suffered a major setback in Germania. Beyond the frontiers, he secured the empire with a buffer region of client states and made peace with the Parthian Empire through diplomacy. He reformed the Roman system of taxation, developed networks of roads with an official courier system, established a standing army, established the Praetorian Guard as well as official police and fire-fighting services for Rome, and rebuilt much of the city during his reign. Augustus died in AD14 at age 75, probably from natural causes. Persistent rumors, substantiated somewhat by deaths in the imperial family, have claimed his wife Livia poisoned him. He was succeeded as emperor by his adopted son Tiberius, Livia's son and former husband of Augustus's only biological child, Julia.
Name.
As a consequence of Roman customs, society, and personal preference, Augustus ( ) was known by many names throughout his life:
Early life.
Octavian was born Gaius Octavius in Rome on 23 September 63 BC. His paternal family was from the Volscian town of Velletri (), approximately south-east of the city. He was born at Ox Head, a small property on the Palatine Hill, very close to the Roman Forum. In his childhood, he received the cognomen "Thurinus", possibly commemorating his father's victory at Thurii over a rebellious band of slaves who had been followers of Spartacus. Roman histories gloss over the childhood of Octavian. Some details about Octavian's upbringing from his now lost autobiography were preserved by Suetonius, while the majority of information is preserved in a biography composed by Nicolaus of Damascus around 20 BC that survives only partially in 10th-century Byzantine excerpts.
Octavian was raised for at least part of his childhood in his father's hometown of Velletri. Octavian's father, also named Gaius Octavius, came from a moderately wealthy equestrian family of the "gens Octavia". His paternal great-grandfather Octavius was a military tribune in Sicily during the Second Punic War. His grandfather was a banker, while his father became a Roman senator, was distinguished as a praetor by 61 BC, and then became a governor of Macedonia. His mother, Atia, was the niece of Julius Caesar.
Octavian was four years old when his father died in 59 BC, or in 58 BC. In 58 BC his mother Atia married a former governor of Syria, Lucius Marcius Philippus. Philippus came from a leading family in Rome, was elected consul in 56 BC, and according to Galinsky as Octavian's stepfather he served as a role model in how to delicately navigate troubled political waters while preserving his personal wealth. Octavian was largely raised by his grandmother, Julia, the sister of Julius Caesar. When Julia died in 52 or 51 BC, Octavian delivered the funeral oration for his grandmother. In Philippus' household, Octavian was educated in reading, writing, arithmetic, and the Greek language by a Greek slave tutor named Sphaerus, who Octavian later freed from slavery and honored with a state funeral in 40 BC. As a teenager he studied philosophy under the tutelage of Areios of Alexandria and Athenodorus of Tarsus, Latin rhetoric under Marcus Epidius, and Greek rhetoric under Apollodorus of Pergamon. In 48 BC Octavian donned the 'toga of manhood', and was elected to the College of Pontiffs (Rome's college of priests) in 47 BC. The following year he was put in charge of the Greek games that were staged in honour of the Temple of Venus Genetrix, built by Julius Caesar.
In 63 BC Julius Caesar became , head of the College of Pontiffs, allowing him to build political clout and eventually form an unofficial junta—the First Triumvirate—with the statesmen Pompey and Marcus Licinius Crassus. This informal alliance, which superseded but did not suspend Rome's constitution, had fallen apart by the time Caesar crossed the Rubicon on 11 January 49 BC and initiated a protracted civil war. In late 47 BC Octavian wished to join Caesar's staff for his campaign in Africa but gave way when his mother protested. Treating him as a son, Caesar had Octavian proceed next to his chariot during his triumph celebrating the campaign, and had him awarded with military decorations as if he had been present for it. In 45 BC Octavian traveled to Hispania to join Caesar's camp during the fight against the lingering forces of Gnaeus Pompeius Magnus the Younger (son of Pompey), convincing his mother Atia not to join him despite her worries about his perennial fragile physical health. Returning to Rome from Hispania in October 45 BC, Caesar deposited a new will with the Vestal Virgins, naming Octavian as the prime beneficiary and his principal heir on 13 September 45 BC. With his election as dictator, Caesar elevated Octavian to the office of ("master of the cavalry") in early 44 BC, the latter serving as a deputy to the dictator.
Rise to power.
Heir to Caesar.
Octavian was studying and undergoing military training in Apollonia, Illyria, when Julius Caesar was assassinated on the Ides of March (15 March) 44 BC. He rejected the advice of some army officers to take refuge with the troops in Macedonia and sailed to Italy to ascertain whether he had any potential political fortunes or security. Caesar had no living legitimate children under Roman law and so had adopted Octavian, his grand-nephew, in his will, making him his primary heir. After landing at Lupiae near Brundisium, Octavian learned the contents of Caesar's will, and only then did he decide to become Caesar's political heir as well as heir to two-thirds of his estate. Octavian's stepfather Philippus advised him against accepting Caesar's will and to live quietly instead, while Atia—who often intervened in young Octavian's affairs—left this pivotal choice to her son, who ultimately accepted it on 8 May 44 BC.
Upon his adoption, Octavian assumed his great-uncle's name Gaius Julius Caesar. Roman citizens adopted into a new family usually retained their old nomen in cognomen form (e.g., for one who had been an Octavius, for one who had been an Aemilius). However, though some of his contemporaries did, there is no evidence that Octavian officially used the name , as it would have made his adoptive origins too obvious. Historians usually refer to the new Caesar as "Octavian" during the time between his adoption and his assumption of the name Augustus in 27 BC in order to avoid confusing the dead dictator with his heir.
Octavian could not rely on his limited funds to make a successful entry into the upper echelons of the Roman political hierarchy. After a warm welcome by Caesar's soldiers at Brundisium, Octavian demanded a portion of the funds that were allotted by Caesar for the intended war against the Parthian Empire in the Middle East. This amounted to 700 million sesterces stored at Brundisium, the staging ground in Italy for military operations in the east. A later senatorial investigation into the disappearance of the public funds took no action against Octavian since he subsequently used that money to raise troops against the Senate's archenemy Mark Antony. Octavian made another bold move in 44 BC when, without official permission, he appropriated the annual tribute that had been sent from Rome's Near Eastern province to Italy.
Octavian began to bolster his personal forces with Caesar's veteran legionaries and with troops designated for the Parthian war, gathering support by emphasizing his status as heir to Caesar. On his march to Rome through Italy, Octavian's presence and newly acquired funds attracted many, winning over Caesar's former veterans stationed in Campania. By June, he had gathered an army of 3,000 loyal veterans, paying each a bonus of 500 .
Growing tensions.
Arriving in Rome on 6 May 44 BC, Octavian found consul Mark Antony, Caesar's former colleague, in an uneasy truce with the dictator's assassins. They had been granted a general amnesty on 17 March in an agreement that they would respect the magistracies installed and laws passed by Caesar to avoid the political turmoil of invalidating them. Soon afterwards, Antony succeeded in driving most of them out of Rome with an inflammatory eulogy at Caesar's funeral, mounting public opinion against the assassins.
Mark Antony was amassing political support, but Octavian still had the opportunity to rival him as the leading member of the faction supporting Caesar. Antony had lost the support of many Romans and supporters of Caesar when he initially opposed the motion to elevate Caesar to divine status. Antony refused to hand over the money due Octavian as Caesar's adopted heir, possibly on grounds that it would take time to disentangle it from state funds, but also as a measure to delay Octavian from carrying out the popular provision in Caesar's will that promised the dispersal of 300 sesterces "per capita" to the urban plebs of Rome. During the summer, Octavian won the support of Caesarian veterans and also made common cause with those senators—many of whom were themselves former Caesarians—who perceived Antony as a threat to the state. After an abortive attempt by the veterans to reconcile Octavian and Antony, Antony's bellicose edicts against Brutus and Cassius alienated him from the moderate Caesarians in the Senate, who feared a renewed civil war. In September, Marcus Tullius Cicero began to attack Antony in a series of speeches portraying him as a threat to the republican order.
First conflict with Antony.
With opinion in Rome turning against him and his year of consular power nearing its end, Antony attempted to pass laws that would assign him the province of Cisalpine Gaul. Octavian meanwhile built up a private army in Italy by recruiting Caesarian veterans, and on 28 November he won over two of Antony's legions with the enticing offer of monetary gain.
In the face of Octavian's large and capable force, Antony saw the danger of staying in Rome and, to the relief of the Senate, he left Rome for Cisalpine Gaul, which was to be handed to him on 1 January. However, the province had earlier been assigned to Decimus Junius Brutus Albinus, one of Caesar's assassins, who now refused to yield to Antony. Antony besieged him at Mutina and rejected the resolutions passed by the Senate to stop the fighting. The Senate had no army to enforce their resolutions. This provided an opportunity for Octavian, who already was known to have armed forces. Cicero also defended Octavian against Antony's taunts about Octavian's lack of noble lineage and aping of Julius Caesar's name, stating "we have no more brilliant example of traditional piety among our youth."
At the urging of Cicero, the Senate inducted Octavian as senator on 1 January 43 BC, yet he also was given the power to vote alongside the former consuls. In addition, Octavian was granted 'commanding power' which legalized his command of troops, sending him to relieve the siege along with Hirtius and Pansa (the consuls for 43 BC). He assumed the fasces on 7 January, a date that he would later commemorate as the beginning of his public career. Antony's forces were defeated at the battles of Forum Gallorum (14 April) and Mutina (21 April), forcing Antony to retreat to Transalpine Gaul. Both consuls were killed, however, leaving Octavian in sole command of their armies. These victories earned him his first acclamation as , a title reserved for victorious commanders.
The Senate heaped many more rewards on Decimus Brutus than on Octavian for defeating Antony, then attempted to give command of the consular legions to Decimus Brutus. In response, Octavian stayed in the Po Valley and refused to aid any further offensive against Antony. In July, an embassy of centurions sent by Octavian entered Rome and demanded the consulship left vacant by Hirtius and Pansa and also that the decree should be rescinded which declared Antony a public enemy. When this was refused, he marched on the city with eight legions. He encountered no military opposition in Rome and on 19 August 43 BC was elected consul with his relative Quintus Pedius as co-consul. Meanwhile, Antony formed an alliance with Marcus Aemilius Lepidus, another leading Caesarian.
Second Triumvirate.
Proscriptions.
In a meeting near Bononia in October 43BC, Octavian, Antony, and Lepidus formed the Second Triumvirate. Their powers were made official by the Senate on 27 November. This explicit arrogation of special powers lasting five years was then legalized by law passed by the plebs, unlike the unofficial First Triumvirate. The triumvirs then set in motion proscriptions, in which between 130 and 300 senators and 2,000 were branded as outlaws and deprived of their property and, for those who failed to escape, their lives. This decree issued by the triumvirate was motivated in part by a need to raise money to pay the salaries of their troops for the upcoming conflict against Caesar's assassins, Marcus Junius Brutus and Gaius Cassius Longinus. Rewards for their arrest gave incentive for Romans to capture those proscribed, while the assets and properties of those arrested were seized by the triumvirs.
Contemporary Roman historians provide conflicting reports as to which triumvir was most responsible for the proscriptions and killing. However, the sources agree that enacting the proscriptions was a means by all three factions to eliminate political enemies. Marcus Velleius Paterculus asserted that Octavian tried to avoid proscribing officials whereas Lepidus and Antony were to blame for initiating them. Cassius Dio defended Octavian as trying to spare as many as possible, whereas Antony and Lepidus, being older and involved in politics longer, had many more enemies to deal with. This claim was rejected by Appian, who maintained that Octavian shared an equal interest with Lepidus and Antony in eradicating his enemies. Suetonius said that Octavian was reluctant to proscribe officials but did pursue his enemies with more vigor than the other triumvirs. Plutarch described the proscriptions as a ruthless and cutthroat swapping of friends and family among Antony, Lepidus, and Octavian. For example, Octavian allowed the proscription of his ally Cicero, Antony the proscription of his maternal uncle Lucius Julius Caesar (the consul for 64 BC), and Lepidus his brother Paullus.
Battle of Philippi and division of territory.
On 1 January 42 BC, the Senate posthumously recognised Julius Caesar as a divinity of the Roman state, . Octavian was able to further his cause by emphasizing the fact that he was , "Son of the Divine". Antony and Octavian then sent twenty-eight legions by sea to face the armies of Brutus and Cassius, who had built their base of power in Greece. After two battles at Philippi in Macedonia in October 42, the Caesarian army was victorious and Brutus and Cassius committed suicide. Mark Antony later used the examples of these battles as a means to belittle Octavian, as both battles were decisively won with the use of Antony's forces. In addition to claiming responsibility for both victories, Antony branded Octavian as a coward for handing over his direct military control to Marcus Vipsanius Agrippa instead.
After Philippi, a new territorial arrangement was made among the members of the Second Triumvirate. Gaul and the province of Hispania were placed in the hands of Octavian. Antony travelled east to Egypt where he allied himself with Queen Cleopatra, the former lover of Julius Caesar and mother of Caesar's son Caesarion. Lepidus was left with the province of Africa, stymied by Antony, who conceded Hispania to Octavian instead.
Octavian was left to decide where in Italy to settle the tens of thousands of veterans of the Macedonian campaign, whom the triumvirs had promised to discharge. The tens of thousands who had fought on the republican side with Brutus and Cassius could easily ally with a political opponent of Octavian if not appeased, and they also required land. There was no more government-controlled land to allot as settlements for their soldiers, so Octavian had to choose one of two options: alienating many Roman citizens by confiscating their land, or alienating many Roman soldiers who could mount a considerable opposition against him in the Roman heartland. Octavian chose the former. There were as many as eighteen Roman towns affected by the new settlements, with entire populations driven out or at least given partial evictions.
Rebellion and marriage alliances.
There was widespread dissatisfaction with Octavian over these settlements of his soldiers, and this encouraged many to rally at the side of Lucius Antonius, who was brother of Mark Antony and supported by a majority in the Senate. Meanwhile, Octavian asked for a divorce from Claudia, the daughter of Fulvia (Antony's wife) and her first husband Publius Clodius Pulcher. He returned Claudia to her mother, claiming that their marriage had never been consummated. Fulvia decided to take action. Together with Lucius Antonius, she raised an army in Italy to fight for Antony's rights against Octavian. Lucius and Fulvia took a political and martial gamble in opposing Octavian however, since the Roman army still depended on the triumvirs for their salaries. Lucius and his allies ended up in a defensive siege at Perusia, where Octavian forced them into surrender in early 40 BC.
Lucius and his army were spared because of his kinship with Antony, the strongman of the East, while Fulvia was exiled to Sicyon. Octavian showed no mercy, however, for the mass of allies loyal to Lucius. On 15 March, the anniversary of Julius Caesar's assassination, he had 300 Roman senators and equestrians executed for allying with Lucius. Perusia also was pillaged and burned as a warning for others. This bloody event sullied Octavian's reputation and was criticised by many, such as Augustan poet Sextus Propertius.
Sextus Pompeius, the son of Pompey and still a renegade general, following Julius Caesar's victory over his father, had established himself in Sicily and Sardinia as part of an agreement reached with the Second Triumvirate in 39 BC. Both Antony and Octavian were vying for an alliance with Pompeius. Octavian succeeded in a temporary alliance in 40 BC when he married Scribonia, a sister (or daughter) of Pompeius's father-in-law Lucius Scribonius Libo. Scribonia gave birth to Octavian's only natural child, Julia, the same day that he divorced her to marry Livia Drusilla, little more than a year after their marriage.
While in Egypt, Antony had been engaged in an affair with Cleopatra and had fathered three children with her. Aware of his deteriorating relationship with Octavian, Antony left Cleopatra; he sailed to Italy in 40 BC with a large force to oppose Octavian, laying siege to Brundisium. This new conflict proved untenable for both Octavian and Antony, however. Their centurions, who had become important figures politically, refused to fight because of their Caesarian cause, while the legions under their command followed suit. Meanwhile, in Sicyon, Antony's wife Fulvia died of a sudden illness while Antony was en route to meet her. Fulvia's death and the mutiny of their centurions allowed the two remaining triumvirs to effect a reconciliation.
In the autumn of 40, Octavian and Antony approved the Treaty of Brundisium, by which Lepidus would remain in Africa, Antony in the East, Octavian in the West. The Italian Peninsula was left open to all for the recruitment of soldiers, but in reality this provision was useless for Antony in the East. To further cement relations of alliance with Antony, Octavian gave his sister, Octavia Minor, in marriage to Antony in late 40 BC.
War with Sextus Pompeius.
Sextus Pompeius threatened Octavian in Italy by denying shipments of grain through the Mediterranean Sea to the peninsula. Pompeius's own son was put in charge as naval commander in the effort to cause widespread famine in Italy. Pompeius's control over the sea prompted him to take on the name , "son of Neptune". A temporary peace agreement was reached in 39 BC with the Pact of Misenum; the blockade on Italy was lifted once Octavian granted Pompeius Sardinia, Corsica, Sicily, and the Peloponnese, and ensured him a future position as consul for 35 BC.
The territorial agreement between the triumvirate and Sextus Pompeius began to crumble once Octavian divorced Scribonia and married Livia on 17 January 38 BC. One of Pompeius's naval commanders betrayed him and handed over Corsica and Sardinia to Octavian. Octavian lacked the resources to confront Pompeius alone, so an agreement was reached with the Second Triumvirate's extension for another five-year period beginning in 37 BC.
In supporting Octavian, Antony expected to gain support for his own campaign against the Parthian Empire, desiring to avenge Rome's defeat at Carrhae in 53 BC. In an agreement reached at Tarentum, Antony provided 120 ships for Octavian to use against Pompeius, while Octavian was to send 20,000 legionaries to Antony for use against Parthia. Octavian sent only a tenth of those promised, which Antony viewed as an intentional provocation.
Octavian and Lepidus launched a joint operation against Sextus in Sicily in 36 BC. Despite setbacks for Octavian, the naval fleet of Sextus Pompeius was almost entirely destroyed on 3 September by General Agrippa at the naval battle of Naulochus. Sextus fled to the east with his remaining forces, where he was captured and executed in Miletus by one of Antony's generals the following year. As Lepidus and Octavian accepted the surrender of Pompeius's troops, Lepidus attempted to claim Sicily for himself, ordering Octavian to leave. Lepidus's troops deserted him, however, and defected to Octavian since they were weary of fighting and were enticed by Octavian's promises of money.
Lepidus surrendered to Octavian and was permitted to retain the office of , but was ejected from the Triumvirate. His public career at an end, he effectively was exiled to a villa at Cape Circei in Italy. The Roman dominions were divided between Octavian in the West and Antony in the East. Octavian ensured Rome's citizens of their rights to property in order to maintain peace and stability in his portion of the empire. This time, he settled his discharged soldiers outside of Italy, while also returning 30,000 slaves to their former Roman owners—slaves who had fled to join Pompeius's army and navy. Octavian had the Senate grant him, his wife, and his sister tribunal immunity, or , in order to ensure his own safety and that of Livia and Octavia once he returned to Rome.
War with Antony and Cleopatra.
Meanwhile, Antony's campaign turned disastrous against Parthia, tarnishing his image as a leader, and the mere 2,000 legionaries sent by Octavian to Antony were hardly enough to replenish his forces. On the other hand, Cleopatra could restore his army to full strength; he already was engaged in a romantic affair with her, so he decided to send Octavia back to Rome. Octavian used this to spread propaganda implying that Antony was becoming less than Roman because he rejected a legitimate Roman spouse for an "Oriental paramour". In 36 BC, Octavian used a political ploy to make himself look less autocratic and Antony more the villain by proclaiming that the civil wars were coming to an end and that he would step down as triumvir—if only Antony would do the same. Antony refused.
Roman troops captured the Kingdom of Armenia in 34 BC, and Antony made his son Alexander Helios the ruler of Armenia. He also awarded the title "Queen of Kings" to Cleopatra, acts that Octavian used to convince the Roman Senate that Antony had ambitions to diminish the preeminence of Rome. Octavian became consul once again on 1 January 33 BC, and he opened the following session in the Senate with a vehement attack on Antony's grants of titles and territories to his relatives and to his queen.
The breach between Antony and Octavian prompted a large portion of the senators, as well as both of that year's consuls, to leave Rome and defect to Antony. However, Octavian received two key deserters from Antony in the autumn of 32 BC: Munatius Plancus and Marcus Titius. These defectors gave Octavian the information that he needed to confirm with the Senate all the accusations that he made against Antony. Octavian forcibly entered the temple of the Vestal Virgins and seized Antony's secret will, which he promptly publicized. The will would have given away Roman-conquered territories as kingdoms for his sons to rule and designated Alexandria as the site for a tomb for him and his queen. In late 32 BC, the Senate officially revoked Antony's powers as consul and declared war on Cleopatra's regime in Egypt.
In early 31 BC, Antony and Cleopatra were temporarily stationed in Greece when Octavian gained a preliminary victory: the navy successfully ferried troops across the Adriatic Sea under the command of Agrippa. Agrippa cut off Antony and Cleopatra's main force from their supply routes at sea, while Octavian landed on the mainland opposite the island of Corcyra (modern Corfu) and marched south. Trapped on land and sea, deserters of Antony's army fled to Octavian's side daily while Octavian's forces were comfortable enough to make preparations.
Antony's fleet sailed through the bay of Actium on the western coast of Greece in a desperate attempt to break free of the naval blockade. It was there that Antony's fleet faced that of Octavian, led by his commanders Agrippa and Gaius Sosius in the Battle of Actium on 2 September 31 BC. Cleopatra and her portion of the fleet withdrew early in the battle and were later joined by Antony; his remaining forces were spared in a last-ditch effort by Cleopatra's fleet that had been waiting nearby.
A year later, Octavian defeated their forces in Alexandria on 1 August 30 BC—after which Antony and Cleopatra committed suicide. Antony fell on his own sword and was allegedly taken by his soldiers back to Cleopatra's tomb where he died in her arms. After meeting with Octavian and refusing to be paraded in a triumph at Rome, Cleopatra took her own life by poisoning, contrary to the popular belief that she was bitten by an asp. Octavian had exploited his position as Caesar's heir to further his own political career, and he was well aware of the dangers in allowing another person to do the same. He therefore followed the advice of the Greek philosopher Arius Didymus that "two Caesars are one too many", ordering Caesarion killed while sparing Cleopatra's children by Antony, with the exception of Antony's older son. Octavian had previously shown little mercy to surrendered enemies and acted in ways that had proven unpopular with the Roman people, yet he was given credit for pardoning many of his opponents after the Battle of Actium.
Sole ruler of Rome.
After Actium and the defeat of Antony and Cleopatra, Octavian was in a position to rule the entire republic under an unofficial principate—with himself as ('First Citizen')— which he achieved through incremental power gains. He did so by courting the Senate and the people while upholding the republican traditions of Rome, maintaining the carefully curated appearance that he was not aspiring to dictatorship or monarchy. The term was previously applied to members of the Roman nobility who distinguished themselves in service to the Republic, and Octavian would embrace this title as part of his cultivated image as a restorer of the Republic. Marching into Rome, Octavian and Agrippa were elected as consuls by the Senate.
Years of civil war had left Rome in a state of near lawlessness, but the republic was not prepared to accept the control of Octavian as a despot. At the same time, Octavian could not give up his authority without risking further civil wars among the Roman generals, and even if he desired no position of authority his position demanded that he look to the well-being of the city of Rome and the Roman provinces. Octavian's aims from this point forward were to return Rome to a state of stability, traditional legality, and civility by lifting the overt political pressure imposed on the courts of law and ensuring free elections—in name at least.
First settlement.
On 13 January 27 BC, Octavian made a show of returning full power to the Roman Senate and relinquishing his control of the Roman provinces and their armies. Under his consulship, however, the Senate had little power in initiating legislation by introducing bills for senatorial debate. Octavian was no longer in direct control of the provinces and their armies, but he retained the loyalty of active duty soldiers and veterans alike. The careers of many clients and adherents depended on his patronage, as his financial power was unrivaled in the Roman Republic. Historian Werner Eck states:
To a large extent, the public was aware of the vast financial resources that Octavian commanded. He failed to encourage enough senators to finance the building and maintenance of networks of roads in Italy in 20 BC, but he undertook direct responsibility for them. This was publicized on the Roman currency issued in 16 BC, after he donated vast amounts of money to the , the public treasury.
According to historian H. H. Scullard, however, Octavian's power was based on the exercise of "a predominant military power and ... the ultimate sanction of his authority was force, however much the fact was disguised." The Senate proposed to Octavian, the victor of Rome's civil wars, that he once again assume command of the provinces. The Senate's proposal was a ratification of Octavian's extra-constitutional power. Through the Senate, Octavian was able to continue the appearance of a still-functional constitution. Feigning reluctance, he accepted a ten-year responsibility of overseeing provinces that were considered chaotic. The provinces ceded to Augustus for that ten-year period comprised much of the conquered Roman world, including all of Hispania and Gaul, Syria, Cilicia, Cyprus, and Egypt. Moreover, command of these provinces provided Octavian with control over the majority of Rome's legions.
While Octavian acted as consul in Rome, he dispatched senators to the provinces under his command as his representatives to manage provincial affairs and ensure that his orders were carried out. The provinces not under Octavian's control were overseen by governors chosen by the Roman Senate. Octavian became the most powerful political figure in the city of Rome and in most of its provinces, but he did not have a monopoly on political and martial power. The Senate still controlled North Africa, an important regional producer of grain, as well as Illyria and Macedonia, two strategic regions with several legions. However, the Senate had control of only five or six legions distributed among three senatorial proconsuls, compared to the twenty legions under the control of Octavian, and their control of these regions did not amount to any political or military challenge to Octavian. The Senate's control over some of the Roman provinces helped maintain a republican facade for the autocratic principate. Also, Octavian's control of entire provinces followed republican-era precedents for the objective of securing peace and creating stability, in which such prominent Romans as Pompey had been granted similar military powers in times of crisis and instability.
Change to Augustus.
On 16 January 27 BC the Senate gave Octavian the new title of . , from the Latin 'to increase', can be translated as "illustrious one" or "sublime". It was a title of religious authority rather than political one, and it indicated that Octavian now approached divinity. His name of Augustus was also more favourable than , the previous one which he styled for himself in reference to the story of the legendary founder of Rome, which symbolised a second founding of Rome. The title of was associated too strongly with notions of monarchy and kingship, an image that Octavian tried to avoid. The Senate also confirmed his position as , which originally meant the member of the Senate with the highest precedence, but in this case it became an almost regnal title for a leader who was first in charge. The honorific was inherited by all future emperors and became the "de facto" main title of the emperor. As a result, modern historians usually regard this event as the beginning of his reign as the "emperor". Augustus himself appears to have reckoned his "reign" from 27 BC.
Augustus styled himself as 'Commander Caesar son of the deified one'. With this title, he boasted his familial link to deified Julius Caesar, and the use of signified a permanent link to the Roman tradition of victory. He transformed , a cognomen for one branch of the Julian family, into a new family line that began with him.
Augustus was granted the right to hang the (civic crown) above his door and to have laurels drape his doorposts. However, he renounced flaunting insignia of power such as holding a scepter, wearing a diadem, or wearing the golden crown and purple toga of his predecessor Julius Caesar. If he refused to symbolize his power by donning and bearing these items on his person, the Senate nonetheless awarded him with a golden shield displayed in the meeting hall of the Curia, bearing the inscription – 'valor, piety, clemency, and justice'.
Second settlement.
By 23 BC, some of the un-republican implications were becoming apparent concerning the settlement of 27 BC. Augustus's retention of an annual consulate drew attention to his "de facto" dominance over the Roman political system and cut in half the opportunities for others to achieve what was still nominally the preeminent position in the Roman state. Further, he was causing political problems by desiring to have his nephew Marcus Claudius Marcellus follow in his footsteps and eventually assume the principate in his turn, alienating his three greatest supporters: Agrippa, Maecenas, and Livia. He appointed noted republican Calpurnius Piso (who had fought against Julius Caesar and supported Cassius and Brutus) as co-consul in 23 BC, after his choice Aulus Terentius Varro Murena died unexpectedly.
In the late spring Augustus had a severe illness and on his supposed deathbed made arrangements that would ensure the continuation of the principate in some form, while allaying senators' suspicions of his anti-republicanism. Augustus prepared to hand down his signet ring to his favored general Agrippa. However, Augustus handed over to his co-consul Piso all of his official documents, an account of public finances, and authority over listed troops in the provinces while Augustus's supposedly favored nephew Marcellus came away empty-handed. This was a surprise to many who believed Augustus would have named an heir to his position as an unofficial emperor.
Augustus bestowed only properties and possessions to his designated heirs, as an obvious system of institutionalized imperial inheritance would have provoked resistance and hostility among the republican-minded Romans fearful of monarchy. With regards to the principate, it was obvious to Augustus that Marcellus was not ready to take on his position; nonetheless, by giving his signet ring to Agrippa, Augustus intended to signal to the legions that Agrippa was to be his successor and that they should continue to obey Agrippa, constitutional procedure notwithstanding.
Soon after his bout of illness subsided, Augustus gave up his consulship. The only other times Augustus would serve as consul would be in the years 5 and 2 BC, both times to introduce his grandsons into public life. This was a clever ploy by Augustus; ceasing to serve as one of two annually elected consuls allowed aspiring senators a better chance to attain the consular position while allowing Augustus to exercise wider patronage within the senatorial class. Although Augustus had resigned as consul, he desired to retain his consular not just in his provinces but throughout the empire. This desire, as well as the Marcus Primus affair, led to a second compromise between him and the Senate known as the second settlement.
The primary reasons for the second settlement were as follows. First, after Augustus relinquished the annual consulship, he was no longer in an official position to rule the state, yet his dominant position remained unchanged over his Roman, 'imperial' provinces where he was still a proconsul. When he annually held the office of consul, he had the power to intervene with the affairs of the other provincial proconsuls appointed by the Senate throughout the empire, when he deemed necessary.
A second problem later arose showing the need for the second settlement in what became known as the "Marcus Primus affair". In late 24 or early 23 BC, charges were brought against Marcus Primus, the former proconsul (governor) of Macedonia, for waging a war without prior approval of the Senate on the Odrysian kingdom of Thrace, whose king was a Roman ally. He was defended by Lucius Licinius Varro Murena who told the trial that his client had received specific instructions from Augustus ordering him to attack the client state. Later, Primus testified that the orders came from the recently deceased Marcellus. Such orders, had they been given, would have been considered a breach of the Senate's prerogative under the constitutional settlement of 27 BC and its aftermath—i.e., before Augustus was granted —as Macedonia was a senatorial province under the Senate's jurisdiction, not an imperial province under the authority of Augustus. Such an action would have ripped away the veneer of republican restoration as promoted by Augustus, and exposed his fraud of merely being the first citizen, a first among equals. Even worse, the involvement of Marcellus provided some measure of proof that Augustus's policy was to have the youth take his place as princeps, instituting a form of monarchy—accusations that had already played out.
The situation was so serious that Augustus appeared at the trial even though he had not been called as a witness. Under oath, Augustus declared that he gave no such order. Murena disbelieved Augustus's testimony and resented his attempt to subvert the trial by using his . He rudely demanded to know why Augustus had turned up to a trial to which he had not been called; Augustus replied that he came in the public interest. Although Primus was found guilty, some jurors voted to acquit, meaning that not everybody believed Augustus's testimony, an insult to the 'August One'.
The second settlement was completed in part to allay confusion and formalize Augustus's legal authority to intervene in senatorial provinces. The Senate granted Augustus a form of general , or proconsular imperium (power) that applied throughout the empire, not solely to his provinces. Moreover, the Senate augmented Augustus's proconsular imperium into , or proconsular imperium applicable throughout the empire that was more (maius) or greater than that held by the other proconsuls. This in effect gave Augustus constitutional power superior to all other proconsuls in the empire. Augustus stayed in Rome during the renewal process and provided veterans with lavish donations to gain their support, thereby ensuring that his status of proconsular imperium maius was renewed in 13 BC.
Additional powers.
During the second settlement, Augustus was also granted the power of a tribune () for life, though not the official title of tribune. For some years, Augustus had been awarded , the immunity given to a tribune of the plebs. Now he decided to assume the full powers of the magistracy, renewed annually, in perpetuity. Legally, it was closed to patricians, a status that Augustus had acquired some years earlier when adopted by Julius Caesar. This power allowed him to convene the Senate and people at will and lay business before them, to veto the actions of either the Assembly or the Senate, to preside over elections, and to speak first at any meeting. Also included in Augustus's tribunician authority were powers usually reserved for the Roman censor; these included the right to supervise public morals and scrutinize laws to ensure that they were in the public interest, as well as the ability to hold a census and determine the membership of the Senate.
With the powers of a censor, Augustus appealed to virtues of Roman patriotism by banning all attire but the classic toga while entering the Forum. There was no precedent within the Roman system for combining the powers of the tribune and the censor into a single position, nor was Augustus ever elected to the office of censor. Julius Caesar had been granted similar powers, wherein he was charged with supervising the morals of the state. However, this position did not extend to the censor's ability to hold a census and determine the Senate's roster. The office of the began to lose its prestige due to Augustus's amassing of tribunal powers, so he revived its importance by making it a mandatory appointment for any plebeian desiring the praetorship.
Augustus was granted sole within the city of Rome in addition to being granted proconsular and tribunician authority for life. Traditionally, proconsuls (Roman province governors) lost their proconsular when they crossed the Pomerium—the sacred boundary of Rome—and entered the city. In these situations, Augustus would have power as part of his tribunician authority, but his constitutional imperium within the Pomerium would be less than that of a serving consul, which meant that when he was in the city he might not be the constitutional magistrate with the most authority. Thanks to his prestige or , his wishes would usually be obeyed, but there might be some difficulty. To fill this power vacuum, the Senate voted that Augustus's (superior proconsular power) should not lapse when he was inside the city walls. All armed forces in the city had formerly been under the control of the urban praetors and consuls, but this situation now placed them under the sole authority of Augustus.
In addition, the credit was given to Augustus for each subsequent Roman military victory after this time, because the majority of Rome's armies were stationed in imperial provinces commanded by Augustus through the legatus who were deputies of the princeps in the provinces. Moreover, if a battle was fought in a senatorial province, Augustus's proconsular allowed him to take command of (or credit for) any major military victory. This meant that Augustus was the only individual able to receive a triumph, a tradition that began with Romulus, Rome's first king and first triumphant general. Tiberius, Augustus's eldest stepson by Livia, was the only other general to receive a triumph—for victories in Germania in 7 BC.
Normally during republican times, the powers Augustus held even after the second settlement would have been split between several people, who would each exercise them with the assistance of a colleague and for a specific period of time. Augustus held them all at once by himself and with no time limits; even those that nominally had time limits were automatically renewed whenever they lapsed.
Conspiracy.
Many of the political subtleties of the second settlement seem to have evaded the comprehension of the plebeian class, who were Augustus's greatest supporters and clientele. This caused them to insist upon Augustus's participation in imperial affairs from time to time. Augustus failed to stand for election as consul in 22 BC, and fears arose once again that he was being forced from power by the aristocratic Senate. In 22, 21, and 19 BC, the people rioted in response and only allowed a single consul to be elected for each of those years, ostensibly to leave the other position open for Augustus.
Likewise, there was a food shortage in Rome in 22 BC which sparked panic, while many urban plebs called for Augustus to take on dictatorial powers to personally oversee the crisis. After a theatrical display of refusal before the Senate, Augustus finally accepted authority over Rome's grain supply "by virtue of his proconsular ", and ended the crisis almost immediately. It was not until AD 8 that a food crisis of this sort prompted Augustus to establish a , a permanent prefect who was in charge of procuring food supplies for Rome.
There were some who were concerned by the expansion of powers granted to Augustus by the second settlement, and this came to a head with the apparent conspiracy of Fannius Caepio. Some time prior to 1 September 22 BC, a certain Castricius provided Augustus with information about a conspiracy led by Fannius Caepio. Murena, the outspoken consul who defended Primus in the Marcus Primus affair, was named among the conspirators. The conspirators were tried in absentia with Tiberius acting as prosecutor; the jury found them guilty, but it was not a unanimous verdict. All the accused were sentenced to death for treason and executed as soon as they were captured—without ever giving testimony in their defence. Augustus ensured that the façade of Republican government continued with an effective cover-up of the events.
In 19 BC, the Senate granted Augustus a form of "general consular imperium", which was probably , like the proconsular powers that he received in 23 BC. Like his tribune authority, the consular powers were another instance of gaining power from offices that he did not actually hold. In addition, Augustus was allowed to wear the consul's insignia in public and before the Senate, as well as to sit in the symbolic chair between the two consuls and hold the fasces, an emblem of consular authority. This seems to have assuaged the populace; regardless of whether or not Augustus was a consul, the importance was that he both appeared as one before the people and could exercise consular power if necessary. On 6 March 12 BC, after the death of Lepidus, he additionally took up the position of , the high priest of the college of the pontiffs, the most important position in Roman religion. On 5 February 2 BC, Augustus was also given the title 'father of the country'.
Stability and staying power.
A final reason for the second settlement was to give the principate constitutional stability and staying power in case something happened to Princeps Augustus. His illness of early 23 BC and the Caepio conspiracy showed that the regime's existence hung by the thin thread of the life of one man, Augustus himself, who had several severe and dangerous illnesses throughout his life. If he were to die from natural causes or fall victim to assassination, Rome could be subjected to another round of civil war. The memories of Pharsalus, the Ides of March, the proscriptions, Philippi, and Actium, barely twenty-five years distant, were still vivid in the minds of many citizens. Proconsular imperium was conferred upon Agrippa for five years, similar to Augustus's power, in order to accomplish this constitutional stability. The exact nature of the grant is uncertain but it probably covered Augustus's imperial provinces, east and west, perhaps lacking authority over the provinces of the Senate. That came later, as did the jealously guarded tribunicia potestas. Augustus's accumulation of powers was now complete.
War and expansion.
By AD 13, Augustus boasted 21 occasions where his troops proclaimed him after a successful battle. Almost the entire fourth chapter in his publicly released memoirs of achievements known as the is devoted to his military victories and honours.
Augustus also promoted the ideal of a superior Roman civilisation with a task of ruling the world (to the extent to which the Romans knew it), a sentiment embodied in words that the contemporary poet Virgil attributes to a legendary ancestor of Augustus: —"Roman, remember to rule the Earth's peoples with authority!" The impulse for expansionism was apparently prominent among all classes at Rome, and it is accorded divine sanction by Virgil's Jupiter in Book 1 of the "Aeneid", where Jupiter promises Rome 'sovereignty without end'.
By the end of his reign, the armies of Augustus had conquered northern Hispania (modern Spain and Portugal) and the Alpine regions of Raetia and Noricum (modern Switzerland, Bavaria, Austria, Slovenia), Illyricum and Pannonia (modern Albania, Croatia, Hungary, Serbia, etc.), and had extended the borders of Africa Proconsularis to the east and south. Judea was added to the province of Syria when Augustus deposed Herod Archelaus, successor to client king Herod the Great. Syria (like Egypt after Antony) was governed by a high prefect of the equestrian class rather than by a proconsul or legate of Augustus.
Again, no military effort was needed in 25 BC when Galatia (part of modern Turkey) was converted to a Roman province shortly after Amyntas of Galatia was killed by an avenging widow of a slain prince from Homonada. The rebellious tribes of Asturias and Cantabria in modern-day Spain were finally quelled in 19 BC, and the territory fell under the provinces of Hispania and Lusitania. This region proved to be a major asset in funding Augustus's future military campaigns, as it was rich in mineral deposits that could be fostered in Roman mining projects, especially the very rich gold deposits at Las Médulas.
Conquering the peoples of the Alps in 16 BC was another important victory for Rome, since it provided a large territorial buffer between the Roman citizens of Italy and Rome's enemies in Germania to the north. Horace dedicated an ode to the victory, while the monumental Trophy of Augustus near Monaco was built to honour the occasion. The capture of the Alpine region also served the next offensive in 12 BC, when Tiberius began the offensive against the Pannonian tribes of Illyricum, and his brother Nero Claudius Drusus moved against the Germanic tribes of the eastern Rhineland. Both campaigns were successful, as Drusus's forces reached the Elbe River by 9 BC—though he died shortly after by falling off his horse. It was recorded that the pious Tiberius walked in front of his brother's body all the way back to Rome.
To protect Rome's eastern territories from the Parthian Empire, Augustus relied on the client states of the east to act as territorial buffers and areas that could raise their own troops for defense. To ensure security of the empire's eastern flank, Augustus stationed a Roman army in Syria, while his skilled stepson Tiberius negotiated with the Parthians as Rome's diplomat to the East. Tiberius was responsible for restoring Tigranes V to the throne of the Kingdom of Armenia.
Arguably his greatest diplomatic achievement was negotiating with Phraates IV of Parthia (37–2 BC) in 20 BC for the return of the battle standards lost by Crassus in the Battle of Carrhae, a symbolic victory and great boost of morale for Rome. Werner Eck claims that this was a great disappointment for Romans seeking to avenge Crassus's defeat by military means. However, Maria Brosius explains that Augustus used the return of the standards as propaganda symbolizing the submission of Parthia to Rome. The event was celebrated in art such as the breastplate design on the statue Augustus of Prima Porta and in monuments such as the Temple of Mars Ultor ('Mars the Avenger') built to house the standards. Parthia had always posed a threat to Rome in the east, but the real battlefront was along the Rhine and Danube rivers. Before the final fight with Antony, Octavian's campaigns against the tribes in Dalmatia were the first step in expanding Roman dominions to the Danube. Victory in battle was not always a permanent success, as newly conquered territories were constantly retaken by Rome's enemies in Germania.
A prime example of Roman loss in battle was the Battle of the Teutoburg Forest in AD 9, where three entire legions led by Publius Quinctilius Varus were destroyed by Arminius, leader of the Cherusci, an apparent Roman ally. Augustus retaliated by dispatching Tiberius and Drusus to the Rhineland to pacify it, which had some success although the battle brought the end to Roman expansion into Germany. The Roman general Germanicus took advantage of a Cherusci civil war between Arminius and Segestes; at the Battle of Idistaviso in AD 16, he defeated Arminius.
Death and succession.
The illness of Augustus in 23 BC brought the problem of succession to the forefront of political issues and the public. To ensure stability, he needed to designate an heir to his unique position in Roman society and government. This was to be achieved in small, undramatic and incremental ways that did not stir senatorial fears of monarchy. If someone was to succeed to Augustus's unofficial position of power, he would have to earn it through his own publicly proven merits.
Some Augustan historians argue that indications pointed toward his sister's son Marcellus, who had been quickly married to Augustus's daughter Julia the Elder. Other historians dispute this since Augustus's will was read aloud to the Senate while he was seriously ill in 23 BC, indicating a preference Marcus Agrippa, who was Augustus's second in charge and arguably the only one of his associates who could have controlled the legions and held the empire together.
After the death of Marcellus in 23 BC, Augustus married his daughter to Agrippa. This union produced five children, three sons and two daughters: Gaius Caesar, Lucius Caesar, Vipsania Julia, Agrippina, and Agrippa Postumus, so named because he was born after Marcus Agrippa died. Shortly after the second settlement, Agrippa was granted a five-year term of administering the eastern half of the empire with the of a proconsul and the same granted to Augustus (although not trumping Augustus's authority), his seat of governance stationed at Samos in the eastern Aegean. This granting of power showed Augustus's favor for Agrippa, but it was also a measure to please members of his Caesarian party by allowing one of their members to share a considerable amount of power with him.
Augustus's intent became apparent to make his grandsons Gaius and Lucius his heirs when he adopted them as his own children. He took the consulship in 5 and 2 BC so that he could personally usher them into their political careers, and they were nominated for the consulships of AD 1 and 4. Augustus also showed favour to his stepsons, Livia's children from her first marriage, Nero Claudius Drusus Germanicus (henceforth referred to as Drusus) and Tiberius Claudius (henceforth Tiberius), granting them military commands and public office, though seeming to favour Drusus. After Agrippa died in 12 BC, Tiberius was ordered to divorce his own wife, Vipsania Agrippina, and marry Augustus's widowed daughter, Julia, as soon as a period of mourning for Agrippa had ended. Drusus's marriage to Augustus's niece Antonia was considered an unbreakable affair, whereas Vipsania was "only" the daughter of the late Agrippa from his first marriage.
Tiberius shared in Augustus's tribune powers as of 6 BC but shortly thereafter went into retirement, reportedly wanting no further role in politics while he exiled himself to Rhodes. No specific reason is known for his departure, though it could have been a combination of reasons, including a failing marriage with Julia as well as a sense of envy and exclusion over Augustus's apparent favouring of the younger Gaius and Lucius. (Gaius and Lucius joined the college of priests at an early age, were presented to spectators in a more favourable light, and were introduced to the army in Gaul.)
After the deaths of both Lucius and Gaius in AD 2 and 4 respectively, and the earlier death of his brother Drusus (9 BC), Tiberius was recalled to Rome in June AD 4, where he was adopted by Augustus on the condition that he, in turn, adopt his nephew Germanicus. This continued the tradition of presenting at least two generations of heirs. In that year, Tiberius was also granted the powers of a tribune and proconsul, emissaries from foreign kings had to pay their respects to him and by AD 13 was awarded with his second triumph and equal level of with that of Augustus.
The only other possible claimant as heir was Agrippa Postumus, who had been exiled by Augustus in AD 7, his banishment made permanent by senatorial decree, and Augustus officially disowned him. He certainly fell out of Augustus's favour as an heir; the historian Erich S. Gruen notes various contemporary sources that state Agrippa Postumus was a "vulgar young man, brutal and brutish, and of depraved character".
On 19 August AD 14, Augustus died while visiting Nola where his father had died. Both Tacitus and Cassius Dio wrote that Livia was rumored to have brought about Augustus's death by poisoning fresh figs. This element features in many modern works of historical fiction pertaining to Augustus's life, but some historians view it as likely to have been a salacious fabrication made by those who had favoured Postumus as heir, or other political enemies of Tiberius. Livia had long been the target of similar rumors of poisoning on the behalf of her son, most or all of which are unlikely to have been true. Alternatively, it is possible that Livia did supply a poisoned fig (she did cultivate a variety of fig named for her that Augustus is said to have enjoyed), but did so as a means of assisted suicide rather than murder. Augustus's health had been in decline in the months immediately before his death, and he had made significant preparations for a smooth transition in power, having at last reluctantly settled on Tiberius as his choice of heir. It is likely that Augustus was not expected to return alive from Nola, but it seems that his health improved once there; it has therefore been speculated that Augustus and Livia conspired to end his life at the anticipated time, having committed all political process to accepting Tiberius, in order to not endanger that transition.
Augustus's famous last words were, "Have I played the part well? Then applaud as I exit" ()—referring to the play-acting and regal authority that he had put on as emperor. An enormous funerary procession of mourners travelled with Augustus's body from Nola to Rome, and all public and private businesses closed on the day of his burial. Tiberius and his son Drusus delivered the eulogy while standing atop two . Augustus's body was coffin-bound and cremated on a pyre close to his mausoleum. It was proclaimed that Augustus joined the company of the gods as a member of the Roman pantheon.
Historian D. C. A. Shotter states that Augustus's policy of favoring the Julian family line over the Claudian might have afforded Tiberius sufficient cause to show open disdain for Augustus after the latter's death; instead, Tiberius was always quick to rebuke those who criticized Augustus. Shotter suggests that Augustus's deification obliged Tiberius to suppress any open resentment that he might have harbored, coupled with Tiberius's "extremely conservative" attitude towards religion. Also, historian R. Shaw-Smith points to letters of Augustus to Tiberius which display affection towards Tiberius and high regard for his military merits. Shotter states that Tiberius focused his anger and criticism on Gaius Asinius Gallus (for marrying Vipsania after Augustus forced Tiberius to divorce her), as well as toward the two young Caesars, Gaius and Lucius—instead of Augustus, the real architect of his divorce and imperial demotion.
Legacy.
Overview.
Augustus created a regime that maintained relative peace and prosperity in the Roman west and the Greek east for two centuries, initiating the celebrated , though Galinsky affirms that the "Augustan Golden Age" myth of the obscures the complicated political challenges that Augustus had to face during his reign. His regime laid the foundations of a concept of universal empire in the Byzantine Empire and the Holy Roman Empires down to their dissolutions in 1453 and 1806, respectively. Both his adoptive surname, Caesar, and his title became the permanent titles of the rulers of the Roman Empire for fourteen centuries after his death, in use both at Old Rome and at New Rome. In many languages, became the word for "emperor", as in the German and in the Bulgarian and subsequently Russian (sometimes or ). The cult of continued until the state religion of the empire was changed to Christianity in 391 by Theodosius I. Consequently, there are many statues and busts of the first emperor. The reign of Augustus was viewed favorably by later Romans, embodied by the Roman Senate's formal wish to every emperor after Trajan that they "be more fortunate than Augustus and better than Trajan".
Augustus composed an account of his achievements, the ', to be inscribed in bronze in front of his mausoleum. Copies of the text were inscribed throughout the empire upon his death. The inscriptions in Latin featured translations in Greek beside it and were inscribed on many public edifices, such as the temple in Ankara dubbed the , called the "queen of inscriptions" by historian Theodor Mommsen. The ' is the only major work by Augustus to have survived, though he is also known to have composed poems entitled , , and , an autobiography of 13 books, a philosophical treatise, and a written rebuttal to Brutus's "Eulogy of Cato". Historians are able to analyze excerpts of letters penned by Augustus, preserved in various works of antiquity that reveal additional facts or clues about his personal life. In his "Res Gestae", Augustus defined the relative peace established by his reign as a pact "born of victories" (), one that brought disastrous Roman civil wars to an end and ensured Romans and subjugated peoples within their Empire upheld a cohesive social pact: the latter would relinquish their sovereignty and pay taxes in exchange for the preservation of their native customs, economic stability, security and protection afforded to them by Rome. This theme of peace being rooted in conquest is also featured prominently in Augustan-era visual artworks.The city of Rome was utterly transformed under Augustus, with Rome's first institutionalized police force, firefighting force, and the establishment of the municipal prefect as a permanent office. The police force was divided into cohorts of 500 men each, while the units of firemen ranged from 500 to 1,000 men each, with 7 units assigned to 14 divided city sectors. A , "prefect of the watch", was put in charge of the vigiles, Rome's fire brigade and police. With Rome's civil wars at an end, Augustus was also able to create a standing army for the Roman Empire, fixed at a size of 28 legions of about 170,000 soldiers. This was supported by numerous auxiliary units of 500 non-citizen soldiers each, often recruited from recently conquered areas.
With his finances securing the maintenance of roads throughout Italy, Augustus installed an official courier system of relay stations overseen by a military officer known as the . Besides the advent of swifter communication among Italian polities, his extensive building of roads throughout Italy also allowed Rome's armies to march swiftly and at an unprecedented pace across the country. In the year 6 Augustus established the , donating 170 million sesterces to the new military treasury that provided for both active and retired soldiers.
One of the most enduring institutions of Augustus was the establishment of the Praetorian Guard in 27 BC, originally a personal bodyguard unit on the battlefield that evolved into an imperial guard as well as an important political force in Rome. They had the power to intimidate the Senate, install new emperors, and depose ones they disliked; the last emperor they served was Maxentius, as it was Constantine I who disbanded them in the early 4th century and destroyed their barracks, the Castra Praetoria.
Although the most powerful individual in the Roman Empire, Augustus wished to embody the spirit of Republican virtue and norms. He also wanted to relate to and connect with the concerns of the plebs and lay people. He achieved this through various means of generosity and a cutting back of lavish excess. In the year 29 BC, Augustus gave 400 sesterces (equal to one-tenth of a Roman pound of gold) each to 250,000 citizens, 1,000 sesterces each to 120,000 veterans in the colonies, and spent 700 million sesterces in purchasing land for his soldiers to settle upon. He also restored 82 different temples to display his care for the Roman pantheon of deities. In 28 BC, he melted down 80 silver statues erected in his likeness and in honour of him, an attempt of his to appear frugal and modest.
The longevity of Augustus's reign and its legacy to the Roman world should not be overlooked as a key factor in its success. As Tacitus wrote, the younger generations alive in AD 14 had never known any form of government other than the principate. Had Augustus died earlier, matters might have turned out differently. The attrition of the civil wars on the old Republican oligarchy and the longevity of Augustus, therefore, must be seen as major contributing factors in the transformation of the Roman state into a "de facto" monarchy in these years. Augustus's own experience, his patience, his tact, and his political acumen also played their parts. He directed the future of the empire down many lasting paths, from the existence of a standing professional army stationed at or near the frontiers, to the dynastic principle so often employed in the imperial succession, to the embellishment of the capital at the emperor's expense. Augustus's ultimate legacy was the peace and prosperity the Empire enjoyed for the next two centuries under the system he initiated. His memory was enshrined in the political ethos of the Imperial age as a paradigm of the good emperor. Every emperor of Rome adopted his name, Caesar Augustus, which gradually lost its character as a name and eventually became a title. The Augustan era poets Virgil and Horace praised Augustus as a defender of Rome, an upholder of moral justice, and an individual who bore the brunt of responsibility in maintaining the empire.
However, for his rule of Rome and establishing the principate, Augustus has also been subjected to criticism throughout the ages. The contemporary Roman jurist Marcus Antistius Labeo, fond of the days of pre-Augustan republican liberty in which he had been born, openly criticised the Augustan regime. In the beginning of his "Annals", Tacitus wrote that Augustus had cunningly subverted Republican Rome into a position of slavery. He continued to say that, with Augustus's death and swearing of loyalty to Tiberius, the people of Rome traded one slaveholder for another. In a 2006 biography on Augustus, Anthony Everitt asserts that through the centuries, judgments on Augustus's reign have oscillated between these two extremes.
Tacitus was of the belief that Nerva (r. 96–98) successfully "mingled two formerly alien ideas, principate and liberty". The 3rd-century historian Cassius Dio acknowledged Augustus as a benign, moderate ruler, yet like most other historians after the death of Augustus, Dio viewed Augustus as an autocrat. The poet Marcus Annaeus Lucanus (AD 39–65) was of the opinion that Caesar's victory over Pompey and the fall of Cato the Younger (95–46 BC) marked the end of traditional liberty in Rome; historian Chester Starr writes of his avoidance of criticizing Augustus, "perhaps Augustus was too sacred a figure to accuse directly."
The Anglo-Irish writer Jonathan Swift (1667–1745), in his "Discourse on the Contests and Dissentions in Athens and Rome", criticised Augustus for installing tyranny over Rome, and likened what he believed Great Britain's virtuous constitutional monarchy to Rome's moral Republic of the 2nd century BC. In his criticism of Augustus, the admiral and historian Thomas Gordon (1658–1741) compared Augustus to the puritanical tyrant Oliver Cromwell (1599–1658). Thomas Gordon and the French political philosopher Montesquieu (1689–1755) both remarked that Augustus was a coward in battle. In his "Memoirs of the Court of Augustus", the Scottish scholar Thomas Blackwell (1701–1757) deemed Augustus a Machiavellian ruler, "a bloodthirsty vindicative usurper", "wicked and worthless", "a mean spirit", and a "tyrant".
Revenue reforms.
Augustus's public revenue reforms had a great impact on the subsequent success of the Empire. Augustus brought a far greater portion of the Empire's expanded land base under consistent, direct taxation from Rome, instead of exacting varying, intermittent, and somewhat arbitrary tributes from each local province as Augustus's predecessors had done. This reform greatly increased Rome's net revenue from its territorial acquisitions, stabilized its flow, and regularized the financial relationship between Rome and the provinces, rather than provoking fresh resentments with each new arbitrary exaction of tribute.
The measures of taxation in the reign of Augustus were determined by population census, with fixed quotas for each province. Citizens of Rome and Italy paid indirect taxes, while direct taxes were exacted from the provinces. Indirect taxes included a 4% tax on the price of slaves, a 1% tax on goods sold at auction, and a 5% tax on the inheritance of estates valued at over 100,000 sesterces by persons other than the next of kin.
An equally important reform was the abolition of private tax farming, which was replaced by salaried civil service tax collectors. Private contractors who collected taxes for the State were the norm in the Republican era. Some of them were powerful enough to influence the number of votes for men running for offices in Rome. These tax farmers called publicans were infamous for their depredations, great private wealth, and the right to tax local areas.
The use of Egypt's immense land rents to finance the Empire's operations resulted from Augustus's conquest of Egypt and the shift to a Roman form of government. As it was effectively considered Augustus's private property rather than a province of the Empire, it became part of each succeeding emperor's patrimonium.
Instead of a legate or proconsul, Augustus installed a prefect from the equestrian class to administer Egypt and maintain its lucrative seaports; this position became the highest political achievement for any equestrian besides becoming Prefect of the Praetorian Guard. The highly productive agricultural land of Egypt yielded enormous revenues that were available to Augustus and his successors to pay for public works and military expeditions.
Month of August.
The month of August (Latin: ) is named after Augustus; until his time it was called Sextilis (named so because it had been the sixth month of the original Roman calendar, with the Latin word for 'six' being ). Commonly repeated lore has it that August has 31 days because Augustus wanted his month to match the length of Julius Caesar's July, but this is an invention of the 13th-century scholar Johannes de Sacrobosco. Sextilis in fact had 31 days before it was renamed, and it was not chosen for its length (see Julian calendar).
According to a quoted by Macrobius, Sextilis was renamed to honour Augustus because several of the most significant events in his rise to power, culminating in the fall of Alexandria, fell in that month.
Creation of Italia.
Roman Italy was established by Augustus in 7 BC with the Latin name . This was the first time the Italian peninsula was united administratively and politically under the same name. Due to this act, Augustus was called the "Father of Italy" by Italian historians such as .
Building projects.
On his deathbed, Augustus boasted "I found a Rome of bricks; I leave to you one of marble." Although there is some truth in the literal meaning of this, Cassius Dio asserts that it was a metaphor for the Empire's strength. Marble could be found in buildings of Rome before Augustus, but it was not extensively used as a building material until the reign of Augustus.
Although this did not apply to the Subura slums, which were still as rickety and fire-prone as ever, he did leave a mark on the monumental topography of the centre and of the Campus Martius, with the (Altar of Peace) and monumental sundial, whose central gnomon was an obelisk taken from Egypt. The relief sculptures decorating the visually augmented the written record of Augustus's triumphs in the "". Its reliefs depicted the imperial pageants of the praetorians, the Vestals, and the citizenry of Rome.
He also built the Temple of Caesar, the Temple of Jupiter Tonans, the Temple of Apollo Palatinus and the Baths of Agrippa, and the Forum of Augustus with its Temple of Mars Ultor. Other projects were either encouraged by him, such as the Theatre of Balbus, and Agrippa's construction of the Pantheon, or funded by him in the name of others, often relations (e.g. Portico of Octavia, Theatre of Marcellus). Even his Mausoleum of Augustus was built before his death to house members of his family. To celebrate his victory at the Battle of Actium, the Arch of Augustus was built in 29 BC near the entrance of the Temple of Castor and Pollux, and widened in 19 BC to include a triple-arch design.
After the death of Agrippa in 12 BC, a solution had to be found in maintaining Rome's water supply system. This came about because it was overseen by Agrippa when he served as aedile, and was even funded by him afterwards when he was a private citizen paying at his own expense. In that year, Augustus arranged a system where the Senate designated three of its members as prime commissioners in charge of the water supply and to ensure that Rome's aqueducts did not fall into disrepair.
In the late Augustan era, the commission of five senators called the (translated as "Supervisors of Public Property") was put in charge of maintaining public buildings and temples of the state cult. Augustus created the senatorial group of the 'supervisors for roads' for the upkeep of roads; this senatorial commission worked with local officials and contractors to organize regular repairs.
The Corinthian order of architectural style originating from ancient Greece was the dominant architectural style in the age of Augustus and the imperial phase of Rome. Suetonius once commented that Rome was unworthy of its status as an imperial capital, yet Augustus and Agrippa set out to dismantle this sentiment by transforming the appearance of Rome upon the classical Greek model.
Residences.
The official residence of Augustus was the on the Palatine which he made into a palace after buying it in 41/40 BC. He had other residences such as the in Rome where Augustus preferred to stay whenever he became ill and which Maecenas left to him in his will in 8 BC. The great villa of Vedius Pollio at Posilipo near Naples was bequeathed (probably forced) to him in 15 BC.
Augustus built the Palazzo a Mare palace on the island of Capri. He also built the immense Villa Giulia on the island of Ventotene as a summer residence early in his reign. The family home of Augustus was probably the villa at Somma Vesuviana, Nola. This was the location where he died and where his father also died.
Physical appearance and official images.
His biographer Suetonius, writing about a century after Augustus's death, described his appearance as
... unusually handsome and exceedingly graceful at all periods of his life, though he cared nothing for personal adornment. He was so far from being particular about the dressing of his hair, that he would have several barbers working in a hurry at the same time, and as for his beard he now had it clipped and now shaved, while at the very same time he would either be reading or writing something ... He had clear, bright eyes ... His teeth were wide apart, small, and ill-kept; his hair was slightly curly and inclined to golden; his eyebrows met. His ears were of moderate size, and his nose projected a little at the top and then bent ever so slightly inward. His complexion was between dark and fair. He was short of stature, although Julius Marathus, his freedman and keeper of his records, says that he was five feet and nine inches [in modern units, just under ], but this was concealed by the fine proportion and symmetry of his figure, and was noticeable only by comparison with some taller person standing beside him...
adding that "his shoes [were] somewhat high-soled, to make him look taller than he really was". Scientific analysis of traces of paint found in his official statues shows that he most likely had light brown hair.
His official images were very tightly controlled and idealised, drawing from a tradition of Hellenistic portraiture rather than the tradition of realism in Roman portraiture. Walker and Burnett assert that he first appeared on coins by the age of 19, and from "the explosion in the number of Augustan portraits attests a concerted propaganda campaign aimed at dominating all aspects of civil, religious, economic and military life with Augustus's person." The early images did indeed depict a young man, but although there were gradual changes his images remained youthful until he died in his seventies, by which time they had "a distanced air of ageless majesty", according to the classicist R. R. R. Smith. Among the best known of many surviving portraits are the Augustus of Prima Porta, the image on the Ara Pacis, and the Via Labicana Augustus, which depicts him in his role as . Several cameo portraits include the Blacas Cameo and "".
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Geography of Antarctica
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The geography of Antarctica is dominated by its south polar location and, thus, by ice. The Antarctic continent, located in the Earth's southern hemisphere, is centered asymmetrically around the South Pole and largely south of the Antarctic Circle. It is washed by the Southern (or Antarctic) Ocean or, depending on definition, the southern Pacific, Atlantic, and Indian Oceans. It has an area of more than . Antarctica is the largest ice desert in the world.
Some 98% of Antarctica is covered by the Antarctic ice sheet, the world's largest ice sheet and also its largest reservoir of fresh water. Averaging at least thick, the ice is so massive that it has depressed the continental bedrock in some areas more than below sea level; subglacial lakes of liquid water also occur (e.g. Lake Vostok). Ice shelves and rises populate the ice sheet on the periphery. The present Antarctic ice sheet accounts for 90 percent of Earth's total ice volume and 70 percent of its fresh water. It houses enough water to raise global sea level by .
In September 2018, researchers at the National Geospatial-Intelligence Agency released a high resolution terrain map (detail down to the size of a car, and less in some areas) of Antarctica, named the "Reference Elevation Model of Antarctica" (REMA).
Regions.
Physically, Antarctica is divided in two by the Transantarctic Mountains, close to the neck between the Ross Sea and the Weddell Sea. Western Antarctica and Eastern Antarctica correspond roughly to the western and eastern hemispheres relative to the Greenwich meridian.
West Antarctica is covered by the West Antarctic Ice Sheet. There has been some concern about this ice sheet, as there is a small chance it will collapse due to rising temperatures in the region. If it does, global ocean levels will rise by a few metres in a short period of time.
Volcanoes.
Volcanic activity occurring beneath glacial ice sheets is known as glaciovolcanism. An article published in 2017 claims that researchers from the University of Edinburgh discovered 91 new volcanoes below the Antarctic ice sheet, adding to the 47 volcanoes that were already known. As of 2017, 138 possible volcanoes have been identified in West Antarctica. There is limited knowledge about West Antarctic Volcanoes due to the presence of the West Antarctic Ice Sheet, which heavily covers the West Antarctic Rift System — a likely hub for volcanic activity. Researchers find it difficult to properly identify volcanic activity due to the comprehensive ice covering.
East Antarctica is significantly larger than West Antarctica, and similarly remains widely unexplored in terms of its volcanic potential. While there are some indications that there is volcanic activity under the East Antarctic Ice Sheet, there is not a significant amount of present information on the subject.
Mount Erebus, as the southernmost historically active volcanic site on the planet, is one of the most notable sites in the study of Antarctic volcanism.
Deception Island is another active Antarctic volcano. It is one of the most protected areas in the Antarctic, given its situation between the South Shetland Islands and the Antarctic Peninsula. As the most active volcano in the Antarctic Peninsula, it has been studied closely since its initial discovery in 1820.
There are four volcanoes on the mainland of Antarctica that are
considered to be active on the basis of observed fumarolic activity or
"recent" tephra deposits:
Mount Rittmann (2,600 m) (73.45°S 165.5° E), a volcanic caldera, is dormant.
Several volcanoes on offshore islands have records of historic activity.
Mount Erebus (3,795 m), a stratovolcano on
Ross Island with 10 known eruptions and 1 suspected eruption.
On the opposite side of the continent,
Deception Island
(62°57'S., 60°38'W.), a volcanic caldera with 10 known
and 4 suspected eruptions, has been the most active.
Buckle Island in the Balleny Islands (66°50'S., 163°12'E.),
Penguin Island (62°06'S., 57°54'W.),
Paulet Island (63°35'S., 55°47'W.), and
Lindenberg Island (64°55'S., 59°40'W.) are also
considered to be active. In 2017, the researchers of Edinburgh University discovered 91 underwater volcanoes under West Antarctica.
Marie Byrd Land.
Marie Byrd Land makes up a large portion of West Antarctica, consisting of the Area below the Antarctic Peninsula. The Marie Byrd Land is a large formation of volcanic rock, characterized by 18 exposed and subglacial volcanoes. 16 of the 18 volcanoes are entirely covered by the antarctic ice sheet. There have been no eruptions recorded from any of the volcanoes in this area, however scientists believe that some of the volcanoes may be potentially active.
Activity.
Scientists and researchers debate whether or not the 138 identified possible volcanoes are active or dormant. It is very hard to definitively say, given that many of these volcanic structures are buried underneath several kilometers of ice. However, ash layers within the West Antarctic Ice Sheet, as well as deformations in the ice surface indicate that the West Antarctic Rift System could be active and contain erupting volcanoes. Additionally, seismic activity in the region hints at magma movement beneath the crust, a sign of volcanic activity. Despite this, however, there is not yet definitive evidence of presently active volcanoes.
Subglacial volcanism is often characterized by ice melt and subglacial water. Though there are other sources of subglacial water, such as geothermal heat, it almost always is a condition of volcanism. Scientists remain uncertain about the presence of liquid water underneath the West Antarctic Ice Sheet, with some claiming to have found evidence indicating its existence.
Conditions of formation.
In West Antarctica's Marie Byrd Land, volcanoes are typically composed of alkaline and basaltic lava. Sometimes, the volcanoes are entirely basaltic in composition. Due to the geographic similarity of the Marie Byrd Land, it is believed that the volcanoes in the West Antarctic Rift System are also composed of basalt.
Above-ice basaltic volcanoes, also known as subaerial basaltic volcanoes, generally form in tall, broad cone shapes. Since they are formed from repeated piling of liquid magma sourced from the center, they spread widely and grow upwards relatively slowly. However, West Antarctic Volcanoes form underneath ice sheets, and are thus categorized as subglacial volcanoes. Subglacial volcanoes that are monogenetic are far more narrow, steeper, flat topped structures. Polygenetic subglacial volcanoes have a wider variety of shapes and sizes due to being made up of many different eruptions. Often, they look more cone shaped, like stratovolcanoes.
Hazards.
Hazardous ash.
Little has been studied about the implications of volcanic ash from eruptions within the Antarctic Circle. It is likely that an eruption at lower latitudes would cause global health and aviation hazards due to ash disbursement. The clockwise air circulation around the low pressure system at the South Pole forces air upwards, hypothetically sending ash upwards towards the Stratospheric jet streams, and thus quickly dispersing it throughout the globe.
Melting ice.
Recently, in 2017, a study found evidence of subglacial volcanic activity within the West Antarctic Ice Sheet. This activity poses a threat to the stability of the Ice Sheet, as volcanic activity leads to increased melting. This could possibly plunge the West Antarctic Ice Sheet into a positive feedback loop of rising temperatures and increased melting.
Canyons.
There are three vast canyons that run for hundreds of kilometers, cutting through tall mountains. None of the canyons are visible at the snow-covered surface of the continent since they are buried under hundreds of meters of ice. The largest of the canyons is called Foundation Trough and is over long and wide. The Patuxent Trough is more than long and over wide, while the Offset Rift Basin is long and wide. These three troughs all lie under and cross the so-called "ice divide" – the high ice ridge that runs all the way from the South Pole out towards the coast of West Antarctica.
West Antarctica.
West Antarctica is the smaller part of the continent, , divided into:
Ice shelves.
Larger ice shelves are:
For all ice shelves see List of Antarctic ice shelves.
Islands.
For a list of all Antarctic islands see List of Antarctic and sub-Antarctic islands.
East Antarctica.
East Antarctica is the larger part of the continent, , both the South Magnetic Pole and geographic South Pole are situated here. Divided into:
Ice shelves.
Larger ice shelves are:
For all ice shelves see List of Antarctic ice shelves.
Islands.
For a list of all Antarctic islands see List of Antarctic and sub-Antarctic islands.
Territorial landclaims.
Seven nations have made official Territorial claims in Antarctica.
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Transport in Antarctica
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Transport in Antarctica has transformed from explorers crossing the isolated remote area of Antarctica by foot to a more open era due to human technologies enabling more convenient and faster transport, predominantly by air and water, but also by land as well.
Transportation technologies on a remote area like Antarctica need to be able to deal with extremely low temperatures and continuous winds to ensure the travelers' safety. Due to the fragility of the Antarctic environment, only a limited amount of transport movements can take place and sustainable transportation technologies have to be used to reduce the ecological footprint.
The infrastructure of land, water and air transport needs to be safe and sustainable.
Currently thousands of tourists and hundreds of scientists a year depend on the Antarctic transportation system.
Important parts of Antarctic transport include ships, but unlike warmer areas access may also require an icebreaker ship. Aircraft and airports are important but have some unique aspects; airstrips may be built on ice or compacted snow and aircraft with ski may be used. On the ground, transport includes traditionally wheeled vehicles adapted to the cold, but also vehicles with skis, such as snowmobiles are important as are towed sleds.
Land transport.
Roads and traverses.
Winds continuously blow snow on roads in Antarctica.
The South Pole Traverse (McMurdo–South Pole highway) is approximately long and links the United States McMurdo Station on the coast to the Amundsen–Scott South Pole Station. It was constructed by leveling snow and in crevasses, but is not paved. There are flags to mark the road.
Also, the United States Antarctic Program maintains two ice roads during the austral summer. One provides access to Pegasus Field on the Ross Ice Shelf. The ice road between Pegasus Field and McMurdo Station is about . The other road provides access to the Ice Runway, which is on sea ice. The road between the Ice Runway and McMurdo Station varies in length from year to year depending on many factors, including ice stability. These roads are critical for resupplying McMurdo Station, Scott Base, and Amundsen–Scott South Pole Station.
Vehicles.
The scarcity and poor quality of road infrastructure limits land transportation by conventional vehicles.
A normal car on tires has very limited capability in Antarctic conditions. Scientific bases are often built on snow-free areas (oases) close to the
ocean. Around these stations and on a hard packed snow or ice, tire based vehicles can drive but on deeper and softer snow, a normal tire-based vehicle cannot travel. Due to these limitations, vehicles on belts have been the preferred option in Antarctica. In 1997, two specialized cars with very large tires running tire pressure as low as travelled onto the high Antarctica Plateau, giving strong indication that tire based vehicles could be an option for efficient travelling in Antarctica.
Mawson Station used classic Volkswagen Beetles, the first production cars to be utilized in Antarctica, from 1963 to 1970. The first of these was named the "Antarctica 1".
In December 1997 into February 1998 two AT44, 4x4 cars (built in Iceland by Arctic Trucks with tire size of 44-inch tall) joined an expedition by the Swedish Polar Institution (SWEA). The cars got used to transport people and supplies from the Ice shelf to WASA station, to perform scanning of the snow and support a drilling expedition to on the Antarctica Plateau 76°S 8°03'W. This is the first time tire based vehicles successfully travel on the Antarctica high plateau.
In 2005, a team of six people took part in the Ice Challenger Expedition. Travelling in a specially designed six wheel drive vehicle, the team completed the journey from the Antarctic coast at Patriot Hills to the geographic South Pole in 69 hours. In doing so they easily beat the previous record of 24 days. They arrived at the South Pole on December 12, 2005.
The team members on that expedition were Andrew Regan, Jason De Carteret, Andrew Moon, Richard Griffiths, Gunnar Egilsson and Andrew Miles. The expedition successfully showed that wheeled transport on the continent is not only possible but also often more practical. The expedition also hoped to raise awareness about global warming and climate change.
From start of December 2008 into February 2009, four AT44, 4x4 cars were used to support a ski race by Amundsen Omega 3, from S82° 41' E17° 43' to South Pole. A film was made of this race by BBC called "On Thin Ice" with Ben Fogle and James Cracknell. The cars started from Novo airbase at S70° 49' E11° 38', establish a route onto the plateau through the crevasse areas in the Shcherbakov Mountain Range driving nearly to the start line of the ski race. For the return journey each car covered between with one fuel depot on the way.
From 2008 to date (Dec 2015) tire based cars, AT44 4x4 and AT44 6x6 have been used every season to support various NGO and scientific expedition/projects, supporting flights, fuel drops, filming, skiers, biker, a tractor, collecting snow samples and more. The combined distance covered on the Antarctica Plateau is over and even though towing capacity is much lower than for most belt based vehicles, the tire based cars multiply the travel speed and use only a fraction of the fuel making this an option for some expeditions/projects.
A second expedition led by Andrew Regan and Andrew Moon departed in November 2010. The Moon-Regan Trans Antarctic Expedition this time traversed the entire continent twice, using two six-wheel-drive vehicles and a Concept Ice Vehicle designed by Lotus. This time the team used the expedition to raise awareness about the global environmental importance of the Antarctic region and to show that biofuel can be a viable and environmentally friendly option.
Water transport.
Antarctica's only harbour is at McMurdo Station. Most coastal stations have offshore anchorages, and supplies are transferred from ship to shore by small boats, barges, and helicopters. A few stations have a basic wharf facility. All ships at port are subject to inspection in accordance with Article 7, Antarctic Treaty. Offshore anchorage is sparse and intermittent, but poses no problem to sailboats designed for the ice, typically with lifting keels and long shorelines.
McMurdo Station (), Palmer Station (); government use only except by permit (see Permit Office under "Legal System"). A number of tour boats, ranging from large motorized vessels to small sailing yachts, visit the Antarctic Peninsula during the summer months (January–March). Most are based in Ushuaia, Argentina.
Air transport.
Transport in Antarctica takes place by air, using fixed-wing aircraft and helicopters.
Runways and helicopter pads have to be kept snow-free to ensure safe take off and landing conditions.
Antarctica has 20 airports, but there are no developed public-access airports or landing facilities. Thirty stations, operated by 16 national governments party to the Antarctic Treaty, have landing facilities for either helicopters and/or fixed-wing aircraft; commercial enterprises operate two additional air facilities.
Helicopter pads are available at 27 stations; runways at 15 locations are gravel, sea-ice, blue-ice, or compacted snow suitable for landing wheeled, fixed-wing aircraft; of these, one is greater than in length, six are between in length, three are between in length, three are less than in length, and two are of unknown length; snow surface skiways, limited to use by ski-equipped, fixed-wing aircraft, are available at another 15 locations; of these, four are greater than 3 km in length, three are between 2 km and 3 km in length, two are between 1 km and 2 km in length, two are less than 1 km in length, and data is unavailable for the remaining four.
Antarctic airports are subject to severe restrictions and limitations resulting from extreme seasonal and geographic conditions; they do not meet ICAO standards, and advance approval from the respective governmental or nongovernmental operating organization is required for landing (1999 est.) Flights to the continent in the permanent darkness of the winter are normally only undertaken in an emergency, with burning barrels of fuel to outline a runway. On September 11, 2008, a United States Air Force C-17 Globemaster III successfully completed the first landing in Antarctica using night-vision goggles at Pegasus Field.
In April 2001 an emergency evacuation of Dr. Ronald Shemenski was needed from Amundsen–Scott South Pole Station when he contracted pancreatitis. Three C-130 Hercules were called back before their final leg because of weather. Organizers then called on Kenn Borek Air based in Calgary, Alberta. Two de Havilland Twin Otters were dispatched out of Calgary with one being back-up. Twin Otters are specifically designed for the Canadian north and Kenn Borek Air's motto is "Anywhere, Anytime, World-Wide". The mission was a success but not without difficulties and drawbacks. Ground crews needed to create a runway with tracked equipment not designed to operate in the low temperatures at that time of year, the aircraft controls had to be "jerry-rigged" when the flaps were frozen in position after landing, and instruments were not reliable because of the cold. When they saw a "faint pink line on the horizon" they knew they were going in the right direction. This was the first rescue from the South Pole during winter. Canada honoured the Otter crew for bravery.
In 2021, an Airbus A340 aeroplane operated by Portuguese charter airline Hi Fly landed in Antarctica for the first time.
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Geography of Alabama
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The geography of Alabama describes a state in the Southeastern United States in North America. It extends from high mountains to low valleys and sandy beaches.
Alabama is 30th in size and borders four U.S. states: Mississippi, Tennessee, Georgia, and Florida. It also borders the Gulf of Mexico.
Physical features.
Extending entirely across the state of Alabama for about northern boundary, and in the middle stretching farther north, is the Cumberland Plateau, or Tennessee Valley region, broken into broad tablelands by the dissection of rivers. In the northern part of this plateau, west of Jackson county, there are about of level highlands from above sea level. South of these highlands, occupying a narrow strip on each side of the Tennessee River, is a country of gentle rolling lowlands varying in elevation from . To the northeast of these highlands and lowlands is a rugged section with steep mountain-sides, deep narrow coves and valleys, and flat mountain-tops. Its elevations range from . In the remainder of this region, the southern portion, the most prominent feature is "Little Mountain", extending about from east to west between two valleys, and rising precipitously on the north side above them or above the sea.
Adjoining the Cumberland Plateau region on the southeast is the Appalachian Valley (locally known as Coosa Valley) region, which is the southern extremity of the Appalachian Mountains, and occupies an area within the state of about . This is a limestone belt with parallel hard rock ridges left standing by erosion to form mountains. Although the general direction of the mountains, ridges, and valleys is northeast and southwest, irregularity is one of the most prominent characteristics. In the northeast are several flat-topped mountains, of which Raccoon and Lookout are the most prominent, having a maximum elevation near the Georgia line of little more than and gradually decreasing in height toward the southwest, where Sand Mountain is a continuation of Raccoon. South of these the mountains are marked by steep northwest sides, sharp crests and gently sloping southeast sides.
Southeast of the Appalachian Valley region, the Piedmont Plateau also crosses the Alabama border from the N.E. and occupies a small triangular-shaped section of which Randolph and Clay counties, together with the northern part of Tallapoosa and Chambers, form the principal portion. Its surface is gently undulating and has an elevation of about above sea level. The Piedmont Plateau is a lowland worn down by erosion on hard crystalline rocks, then uplifted to form a plateau.
The remainder of the state is occupied by the "Coastal Plain". This is crossed by foothills and rolling prairies in the central part of the state, where it has a mean elevation of about , becomes lower and more level toward the southwest, and in the extreme south is flat and but slightly elevated above the sea.
The Cumberland Plateau region is drained to the west-northwest by the Tennessee River and its tributaries; all other parts of the state are drained to the southwest. In the Appalachian Valley region the Coosa River is the principal river; and in the Piedmont Plateau, the Tallapoosa River. In the Coastal Plain are the Tombigbee River in the west, the Alabama River (formed by the Coosa and Tallapoosa) in the western central, and in the east the Chattahoochee River, which forms almost half of the Georgia boundary. The Tombigbee and Alabama rivers unite near the southwest corner of the state, their waters discharging into Mobile Bay by the Mobile and Tensas rivers. The Black Warrior River is a considerable stream which joins the Tombigbee from the east.
The valleys in the north and northeast are usually deep and narrow, but in the Coastal Plain they are broad and in most cases rise in three successive terraces above the stream. The harbour of Mobile was formed by the drowning of the lower part of the valley of the Alabama and Tombigbee rivers as a result of the sinking of the land here, such sinking having occurred on other parts of the Gulf coast.
Flora and fauna.
The fauna and flora of Alabama are similar to those of the Gulf states in general and have no distinctive characteristics. However, the Mobile River system has a high incidence of endemism among freshwater mollusks and biodiversity is high.
In Alabama, vast forests of pine constitute the largest proportion of the state's forest growth. There is also an abundance of cypress, hickory, oak, populus, and eastern redcedar trees. In other areas, hemlock growths in the north and southern white cedar in the southwest. Other native trees include ash, hackberry, and holly. In the Gulf region of the state grow various species of palmetto and palm. In Alabama there are more than 150 shrubs, including mountain laurel and rhododendron. Among cultivated plants are wisteria and camellia.
While in the past the state enjoyed a variety of mammals such as plains bison, eastern elk, North American cougar, bear, and deer, only the white-tailed deer remains abundant. Still fairly common are the bobcat, American beaver, muskrat, raccoon, Virginia opossum, rabbit, squirrel, red and gray foxes, and long-tailed weasel. Coypu and nine-banded armadillo have been introduced to the state and now also common.
Alabama's birds include golden and bald eagles, osprey and other hawks, yellow-shafted flickers, and black-and-white warblers. Game birds include bobwhite quail, duck, wild turkey, and goose. Freshwater fish such as bream, shad, bass, and sucker are common. Along the Gulf Coast there are seasonal runs of tarpon, pompano, red drum, and bonito.
The U.S. Fish and Wildlife Service lists as endangered 99 animals, fish, and birds, and 18 plant species. The endangered animals include the Alabama beach mouse, gray bat, Alabama red-bellied turtle, fin and humpback whales, bald eagle, and wood stork.
American black bear, racking horse, yellow-shafted flicker, wild turkey, Atlantic tarpon, largemouth bass, southern longleaf pine, eastern tiger swallowtail, monarch butterfly, Alabama red-bellied turtle, Red Hills salamander, camellia, oak-leaf hydrangea, peach, pecan, and blackberry are Alabama's state symbols.
Climate and soil.
The climate of Alabama is humid subtropical.
The heat of summer is tempered in the south by the winds from the Gulf of Mexico, and in the north by the elevation above the sea. The average annual temperature is highest in the southwest along the coast, and lowest in the northeast among the highlands. Thus at Mobile the annual mean is , the mean for the summer , and for the winter ; and at Valley Head, in De Kalb county, the annual mean is , the mean for the summer , and for the winter . At Montgomery, in the central region, the average annual temperature is , with a winter average of , and a summer average of . The average winter minimum for the entire state is , and there is an average of 35 days in each year in which the thermometer falls below the freezing-point. At extremely rare intervals the thermometer has fallen below zero (-18 °C), as was the case in the remarkable cold wave of the 12th-13 February 1899, when an absolute minimum of was registered at Valley Head. The highest temperature ever recorded was in Talladega county in 1902.
The amount of precipitation is greatest along the coast (62 inches/1,574 mm) and evenly distributed through the rest of the state (about 52 inches/1,320 mm). During each winter there is usually one fall of snow in the south and two in the north; but the snow quickly disappears, and sometimes, during an entire winter, the ground is not covered with snow. Heavy snowfall can occur, such as during the New Year's Eve 1963 snowstorm and the 1993 Storm of the Century. Hailstorms occur occasionally in the spring and summer, but are seldom destructive. Heavy fogs are rare, and are confined chiefly to the coast. Thunderstorms occur throughout the year - they are most common in the summer, but most severe in the spring and fall, when destructive winds and tornadoes occasionally occur. The prevailing winds are from the news. Hurricanes are quite common in the state, especially in the southern part, and major hurricanes occasionally strike the coast which can be very destructive.
As regards its soil, Alabama may be divided into four regions. Extending from the Gulf northward for about is the outer belt of the Coastal Plain, also called the "Timber Belt," whose soil is sandy and poor, but responds well to fertilization. North of this is the inner lowland of the Coastal Plain, or the "Black Prairie," which includes some and seventeen counties. It receives its name from its soil (weathered from the weak underlying limestone), which is black in colour, almost destitute of sand and loam, and rich in limestone and marl formations, especially adapted to the production of cotton; hence the region is also called the "Cotton Belt." Between the "Cotton Belt" and the Tennessee Valley is the mineral region, the "Old Land" area—a region of resistant rocks—whose soils, also derived from weathering in silu, are of varied fertility, the best coming from the granites, sandstones and limestones, the poorest from the gneisses, schists and slates. North of the mineral region is the "Cereal Belt," embracing the Tennessee Valley and the counties beyond, whose richest soils are the red clays and dark loams of the river valley; north of which are less fertile soils, produced by siliceous and sandstone formations.
Wetumpka Meteor Crater.
Wetumpka is the home of "Alabama's greatest natural disaster." A -wide meteorite hit the area about 80 million years ago. The hills just east of downtown showcase the eroded remains of the wide impact crater that was blasted into the bedrock, with the area labeled the Wetumpka crater or astrobleme ("star-wound") for the concentric rings of fractures and zones of shattered rock can be found beneath the surface. In 2002, Christian Koeberl with the Institute of Geochemistry University of Vienna published evidence and established the site as an internationally recognized impact crater.
Public lands.
Alabama includes several types of public use lands. These include four national forests and one national preserve within state borders that provide over 25% of the state's public recreation land.
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List of governors of Alabama
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The governor of Alabama is the head of government of the U.S. state of Alabama. The governor is the head of the executive branch of Alabama's state government and is charged with enforcing state laws.
There have officially been 54 governors of the state of Alabama; this official numbering skips acting and military governors. The first governor, William Wyatt Bibb, served as the only governor of the Alabama Territory. Five people have served as acting governor, bringing the total number of people serving as governor to 59, spread over 63 distinct terms. Four governors have served multiple non-consecutive terms: Bibb Graves, Jim Folsom, and Fob James each served two, and George Wallace served three non-consecutive periods. Officially, these non-consecutive terms are numbered only with the number of their first term. William D. Jelks also served non-consecutive terms, but his first term was in an acting capacity.
The longest-serving governor was George Wallace, who served 16 years over four terms. The shortest term for a non-acting governor was that of Hugh McVay, who served four and a half months after replacing the resigning Clement Comer Clay. Lurleen Wallace, the first wife of George Wallace, was the first woman to serve as governor of Alabama, and the third woman to serve as governor of any state. The current governor is Republican Kay Ivey, who took office on April 10, 2017 following Robert J. Bentley's resignation amidst a corruption scandal. She is the second female governor of Alabama.
List of governors.
Territory of Alabama.
Alabama Territory was formed on March 3, 1817, from Mississippi Territory. It had only one governor appointed by the President of the United States before it became a state; he became the first state governor.
State of Alabama.
Alabama was admitted to the Union on December 14, 1819. It seceded from the Union on January 11, 1861, and was a founding member of the Confederate States of America on February 4, 1861. Following the end of the American Civil War, Alabama during Reconstruction was part of the Third Military District, which exerted some control over governor appointments and elections. Alabama was readmitted to the Union on July 14, 1868.
The first Alabama Constitution, ratified in 1819, provided that a governor be elected every two years, limited to serve no more than 4 out of every 6 years. This limit remained in place until the constitution of 1868, which simply allowed governors to serve terms of two years. The current constitution of 1901 increased terms to four years, but prohibited governors from succeeding themselves. An amendment in 1968 allowed governors to succeed themselves once; a governor serving two consecutive terms can run again after waiting out the next term. The constitution had no set date for the commencement of a governor's term until 1901, when it was set at the first Monday after the second Tuesday in the January following an election. However, the Alabama Supreme Court ruled in 1911 that a governor's term ends at midnight at the end of Monday, and the next governor's term begins the next day, regardless of if they were sworn in on Monday.
The office of lieutenant governor was created in 1868, abolished in 1875, and recreated in 1901. According to the current constitution, should the governor be out of the state for more than 20 days, the lieutenant governor becomes acting governor, and if the office of governor becomes vacant the lieutenant governor ascends to the governorship. The governor and the lieutenant governor are elected at the same time but not on the same ticket.
Alabama was a strongly Democratic state before the Civil War, electing only candidates from the Democratic-Republican and Democratic parties. It had two Republican governors following Reconstruction, but after the Democratic Party re-established control, 112 years passed before voters chose another Republican. Since 2002, the state has continuously elected Republicans to the governorship.
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Apocrypha
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Apocrypha () are biblical or related writings not forming part of the accepted canon of scripture, some of which might be of doubtful authorship or authenticity. In Christianity, the word "apocryphal" (ἀπόκρυφος) was first applied to writings that were to be read privately rather than in the public context of church services. Apocrypha were edifying Christian works that were not always initially included as canonical scripture.
The adjective "apocryphal", meaning of doubtful authenticity, mythical, fictional, is recorded from the late 16th century, then taking on the popular meaning of "false," "spurious," "bad," or "heretical." It may be used for any book which might have scriptural claims but which does not appear in the canon accepted by the author. A related term for both canon and non-canonical texts whose authorship seems incorrect is pseudepigrapha, a term that means "false attribution".
In Christianity, the name "the Apocrypha" is applied to a particular set of books which, when they appear in a Bible, are sometimes placed between the Old and New Testaments in a section called "Apocrypha." The canonicity of such books took longer to determine. Various of these books are accepted by the Catholic Church, Orthodox Churches and the Church of the East, as deuterocanonical. Some Protestant traditions reject them outright; others regard the Apocrypha as non-canonical books that are useful for instruction.
Etymology.
The word's origin is the Medieval Latin adjective (secret, or non-canonical) from the Greek adjective , , (private) from the verb , (to hide away).
It comes from Greek and is formed from the combination of (away) and (hide or conceal).
The word "apocrypha" has undergone a major change in meaning throughout the centuries. The word "apocrypha" in its ancient Christian usage originally meant a text read in private, rather than in public church settings. In English, it later came to have a sense of the esoteric, suspicious, or heretical, largely because of the Protestant interpretation of the usefulness of non-canonical texts.
Esoteric writings and objects.
The word "apocryphal" () was first applied to writings that were kept secret because they were the vehicles of esoteric knowledge considered too profound or too sacred to be disclosed to anyone other than the initiated. For example, the disciples of the Gnostic Prodicus boasted that they possessed the secret () books of Zoroaster. The term in general enjoyed high consideration among the Gnostics (see Acts of Thomas, pp. 10, 27, 44).
Sinologist Anna Seidel refers to texts and even items produced by ancient Chinese sages as apocryphal and studied their uses during Six Dynasties China (AD 220–589). These artifacts were used as symbols legitimizing and guaranteeing the Emperor's Heavenly Mandate. Examples of these include talismans, charts, writs, tallies, and registers. The first examples were stones, jade pieces, bronze vessels and weapons, but came to include talismans and magic diagrams.
From their roots in Zhou era China (1066–256 BC), these items came to be surpassed in value by texts by the Han dynasty (206 BC – AD 220). Most of these texts have been destroyed as Emperors, particularly during the Han dynasty, collected these legitimizing objects and proscribed, forbade and burnt nearly all of them to prevent them from falling into the hands of political rivals.
Writings of questionable value.
"Apocrypha" was also applied to writings that were hidden not because of their divinity but because of their questionable value to the church. The early Christian theologian Origen, in his "Commentaries on Matthew", distinguishes between writings that were read by the churches and apocryphal writings: ("writing not found in the common and published books on one hand [and] actually found in the secret ones on the other"). The meaning of is here practically equivalent to "excluded from the public use of the church" and prepares the way for an even less favourable use of the word.
Spurious writings.
In general use, the word "apocrypha" came to mean "of doubtful authenticity". This meaning also appears in Origen's prologue to his commentary on the Song of Songs, of which only the Latin translation survives:
Other.
The Gelasian Decree (generally held now as being the work of an anonymous scholar between 519 and 553) refers to religious works by Church Fathers Eusebius, Tertullian and Clement of Alexandria as apocrypha. Augustine defined the word as meaning simply "obscurity of origin", implying that any book of unknown authorship or questionable authenticity would be considered apocryphal. Jerome in "Prologus Galeatus" declared that all books outside the Hebrew canon were apocryphal. In practice, Jerome treated some books outside the Hebrew canon as if they were canonical, and the Western Church did not accept Jerome's definition of apocrypha, instead retaining the word's prior meaning. As a result, various church authorities labeled different books as apocrypha, treating them with varying levels of regard.
Origen stated that "the canonical books, as the Hebrews have handed them down, are twenty-two". Clement and others cited some apocryphal books as "scripture", "divine scripture", "inspired", and the like. Teachers connected with Palestine and familiar with the Hebrew canon (the protocanon) excluded from the canon all of the Old Testament not found there. This view is reflected in the canon of Melito of Sardis, and in the prefaces and letters of Jerome. A third view was that the books were not as valuable as the canonical scriptures of the Hebrew collection, but were of value for moral uses, as introductory texts for new converts from paganism, and to be read in congregations. They were referred to as "ecclesiastical" works by Rufinus.
In 1546, the Catholic Council of Trent reconfirmed the canon of Augustine, dating to the second and third centuries, declaring "He is also to be anathema who does not receive these entire books, with all their parts, as they have been accustomed to be read in the Catholic Church, and are found in the ancient editions of the Latin Vulgate, as sacred and canonical." The whole of the books in question, with the exception of 1 Esdras and 2 Esdras and the Prayer of Manasseh, were declared canonical at Trent.
The Protestants, in comparison, were diverse in their opinion of the deuterocanon early on. Some considered them divinely inspired, others rejected them. Lutherans and Anglicans retained the books as Christian intertestamental readings and a part of the Bible (in a section called "Apocrypha"), but no doctrine should be based on them. John Wycliffe, a 14th-century Christian Humanist, had declared in his biblical translation that "whatever book is in the Old Testament besides these twenty-five shall be set among the apocrypha, that is, without authority or belief." Nevertheless, his translation of the Bible included the apocrypha and the Epistle of the Laodiceans.
Martin Luther did not class apocryphal books as being scripture, but in the German Luther Bible (1534) the apocrypha are published in a separate section from the other books, although the Lutheran and Anglican lists are different. Anabaptists use the Luther Bible, which contains the intertestamental books; Amish wedding ceremonies include "the retelling of the marriage of Tobias and Sarah in the Apocrypha". The fathers of Anabaptism, such as Menno Simons, quoted "them [the Apocrypha] with the same authority and nearly the same frequency as books of the Hebrew Bible" and the texts regarding the martyrdoms under Antiochus IV in 1 Maccabees and 2 Maccabees are held in high esteem by the Anabaptists, who faced persecution in their history.
In Reformed editions (like the Westminster), readers were warned that these books were not "to be any otherwise approved or made use of than other human writings". A milder distinction was expressed elsewhere, such as in the "argument" introducing them in the Geneva Bible, and in the Sixth Article of the Church of England, where it is said that "the other books the church doth read for example of life and instruction of manners," though not to establish doctrine. Among some Nonconformists, the term "apocryphal" began to take on extra or altered connotations: not just of dubious authenticity, but having spurious or false content, Protestants, being diverse in theological views, were not unanimous in adopting those meanings.
Generally, Anabaptists and magisterial Protestants recognize the fourteen books of the Apocrypha as being non-canonical, but useful for reading "for example of life and instruction of manners": a view that continues today throughout the Lutheran Church, the worldwide Anglican Communion, among many other denominations, such as the Methodist Churches and Quaker Yearly Meetings. Liturgically, the Catholic, Methodist and Anglican churches have a scripture reading from the Book of Tobit in services of Holy Matrimony.
According to the Orthodox Anglican Church:
Though Protestant Bibles historically include 80 books, 66 of these form the Protestant canon (such as listed in the Westminster Confession of 1646), which has been well established for centuries, with many today supporting the use of the Apocrypha and others contending against the Apocrypha using various arguments.
Metaphorical usage.
The adjective "apocryphal" is commonly used in modern English to refer to any text or story considered to be of dubious veracity or authority, although it may contain some moral truth. In this broader metaphorical sense, the word suggests a claim that is in the nature of folklore, factoid or urban legend.
Buddhism.
Apocryphal Jatakas of the Pāli Canon, such as those belonging to the Paññāsajātaka collection, have been adapted to fit local culture in certain Southeast Asian countries and have been retold with amendments to the plots to better reflect Buddhist morals.
Within the Pali tradition, the apocryphal Jatakas of later composition (some dated even to the 19th century) are treated as a separate category of literature from the "official" Jataka stories that have been more-or-less formally canonized from at least the 5th century—as attested to in ample epigraphic and archaeological evidence, such as extant illustrations in bas relief from ancient temple walls.
Judaism.
The Jewish apocrypha, known in Hebrew as הספרים החיצונים ("Sefarim Hachizonim:" "the external books"), are books written in large part by Jews, especially during the Second Temple period, not accepted as sacred manuscripts when the Hebrew Bible was canonized. Some of these books are considered sacred by some Christians, and are included in their versions of the Old Testament. The Jewish apocrypha is distinctive from the New Testament apocrypha and biblical apocrypha as it is the only one of these collections that works within a Jewish theological framework.
Although Orthodox Jews believe in the exclusive canonization of the current 24 books in the Hebrew Bible, they also consider the Oral Torah, which they believe was handed down from Moses, to be authoritative. Some argue that the Sadducees, unlike the Pharisees but like the Samaritans, seem to have maintained an earlier and smaller number of texts as canonical, preferring to hold to only what was written in the Law of Moses (the Torah), making most of the presently accepted canon, both Jewish and Christian, apocryphal in their eyes. Others believe that it is often mistakenly asserted that the Sadducees only accepted the Pentateuch (Torah). The Essenes in Judea and the Therapeutae in Egypt were said to have a secret literature (see Dead Sea scrolls).
Other traditions maintained different customs regarding canonicity. The Ethiopian Jews, for instance, seem to have retained a spread of canonical texts similar to the Ethiopian Orthodox Christians.
Christianity.
Intertestamental books.
During the Apostolic Age many Jewish texts of Hellenistic origin existed within Judaism and were frequently used by Christians. Patristic authorities frequently recognized these books as important to the emergence of Christianity, but the inspired authority and value of the apocrypha remained widely disputed. Christians included several of these books in the canons of the Christian Bibles, calling them the "apocrypha" or the "hidden books".
In the sixteenth century, during the Protestant Reformation, the canonical validity of the intertestamental books was challenged and fourteen books were classed in 80 book Protestant Bibles as an intertestamental section called the Apocrypha, which straddles the Old Testament and New Testament. Prior to 1629, all English-language Protestant Bibles included the Old Testament, Apocrypha, and New Testament; examples include the "Matthew's Bible (1537), the Great Bible (1539), the Geneva Bible (1560), the Bishop's Bible (1568), and the King James Bible (1611)".
Fourteen out of eighty biblical books comprise the Protestant Apocrypha, first published as such in Luther's Bible (1534). Many of these texts are considered canonical Old Testament books by the Catholic Church, affirmed by the Council of Rome (AD 382) and later reaffirmed by the Council of Trent (1545–63); all of the books of the Protestant Apocrypha are considered canonical by the Eastern Orthodox Church and are referred to as "anagignoskomena" per the Synod of Jerusalem (1672). The Lutheran Churches normatively include in the Bible the Apocrypha as an intertestamental section between the Old Testament and the New Testament; the systematic theologian Martin Chemnitz, a leading figure in the development of Evangelical Lutheranism "separated Scripture into two categories: those from which the Church makes doctrine and those from which the Church does not." The Book of Concord, the compendium of Evangelical Lutheran doctrine, quotes passages from the Apocrypha/Deuterocanon. The "Dietrich Catechism", widely used in Evangelical Lutheranism, affirms that apart from the canonical books, the Lutheran Bible includes the apocrypha. To this date, scripture readings from the Apocrypha are included in the lectionaries of the Lutheran Churches and the Anglican Churches.
Anabaptists use the Luther Bible, which contains the intertestamental books; Amish wedding ceremonies include "the retelling of the marriage of Tobias and Sarah in the Apocrypha". The Anglican Communion accepts the Protestant Apocrypha "for instruction in life and manners, but not for the establishment of doctrine (Article VI in the Thirty-Nine Articles)", and many "lectionary readings in The Book of Common Prayer are taken from the Apocrypha", with these lessons being "read in the same ways as those from the Old Testament".
The first Methodist liturgical book, "The Sunday Service of the Methodists", employs verses from the Apocrypha, such as in the Eucharistic liturgy. The Protestant Apocrypha contains three books (1 Esdras, 2 Esdras and the Prayer of Manasseh) that are accepted by many Eastern Orthodox Churches and Oriental Orthodox Churches as canonical, but are regarded as non-canonical by the Catholic Church and are therefore not included in modern Catholic Bibles.
In the 1800s, the British and Foreign Bible Society did not regularly publish the intertestamental section in its Bibles, citing the cost of printing the Apocrypha in addition to the Old Testament and New Testament as a major factor; this legacy came to characterize English-language Bibles in Great Britain and the Americas, unlike in Europe where Protestant Bibles are printed with 80 books in three sections: the Old Testament, Apocrypha, and New Testament.
In the present-day, "English Bibles with the Apocrypha are becoming more popular again", usually being printed as intertestamental books. The Revised Common Lectionary, in use by most mainline Protestants including Methodists and Moravians, lists readings from the Apocrypha in the liturgical calendar, although alternate Old Testament scripture lessons are provided.
The status of the deuterocanonicals remains unchanged in Catholic and Orthodox Christianity, though there is a difference in number of these books between these two branches of Christianity. Some authorities began using term "deuterocanonical" to refer to this traditional intertestamental collection as books of "the second canon". These books are often seen as helping to explain the theological and cultural transitions that took place between the Old and New Testaments. They are also sometimes called "intertestamental" by religious groups who do not recognize Hellenistic Judaism as belonging with either Jewish or Christian testaments.
Slightly varying collections of apocryphal, deuterocanonical or intertestamental books of the Bible form part of the Catholic, Eastern Orthodox and Oriental Orthodox canons. The deuterocanonical or intertestamental books of the Catholic Church include Tobit, Judith, Baruch, Sirach, 1 Maccabees, 2 Maccabees, Wisdom and additions to Esther, Daniel, and Baruch.
The Book of Enoch is included in the biblical canon of the Oriental Orthodox churches of Ethiopia and Eritrea. The Epistle of Jude alludes to a story in the book of Enoch, and some believe the use of this book also appears in the four gospels and 1 Peter. While Jesus and his disciples sometimes used phrases also featured in some of the Apocryphal books, the Book of Enoch was never referenced by Jesus. The genuineness and inspiration of Enoch were believed in by the writer of the Epistle of Barnabas, Irenaeus, Tertullian and Clement of Alexandria and many others of the early church. The Epistles of Paul and the Gospels also show influences from the Book of Jubilees, which is part of the Ethiopian canon, as well as the Assumption of Moses and the Testaments of the Twelve Patriarchs, which are included in no biblical canon.
Canonicity.
The establishment of a largely settled uniform canon was a process of centuries, and what the term "canon" (as well as "apocrypha") precisely meant also saw development. The canonical process took place with believers recognizing writings as being inspired by God from known or accepted origins, subsequently being followed by official affirmation of what had become largely established through the study and debate of the writings.
The first ecclesiastical decree on the Catholic Church's canonical books of the Sacred Scriptures is attributed to the Council of Rome (382), and is correspondent to that of Trent. Martin Luther, like Jerome, favored the Masoretic canon for the Old Testament, excluding apocryphal books in the Luther Bible as unworthy to be properly called scripture, but included most of them in a separate section. Luther did not include the deuterocanonical books in his Old Testament, terming them "Apocrypha, that are books which are not considered equal to the Holy Scriptures, but are useful and good to read."
The Eastern Orthodox Church accepts four other books into its canon than what are contained in the Catholic canon: Psalm 151, the Prayer of Manasseh, 3 Maccabees, and 1 Esdras.
Disputes.
The status of the books that the Catholic Church terms "Deuterocanonicals" (second canon) and Protestantism refers to as "Apocrypha" has been an issue of disagreement that preceded the Reformation. Many believe that the pre-Christian-era Jewish translation (into Greek) of holy scriptures known as the Septuagint, a Greek translation of the Hebrew Scriptures originally compiled around 280 BC, originally included the apocryphal writings in dispute, with little distinction made between them and the rest of the Old Testament. Others argue that the Septuagint of the first century did not contain these books but they were added later by Christians.
The earliest extant manuscripts of the Septuagint are from the fourth century, and suffer greatly from a lack of uniformity as regards containing apocryphal books, and some also contain books classed as pseudepigrapha, from which texts were cited by some early writers in the second and later centuries as being scripture.
While a few scholars conclude that the Jewish canon was the achievement of the Hasmonean dynasty, it is generally considered not to have been finalized until about 100 AD or somewhat later, at which time considerations of Greek language and beginnings of Christian acceptance of the Septuagint weighed against some of the texts. Some were not accepted by the Jews as part of the Hebrew Bible canon and the Apocrypha is not part of the historical Jewish canon.
Early church fathers such as Athanasius, Melito, Origen, and Cyril of Jerusalem, spoke against the canonicity of much or all of the apocrypha, but the most weighty opposition was the fourth century Catholic scholar Jerome who preferred the Hebrew canon, whereas Augustine and others preferred the wider (Greek) canon, with both having followers in the generations that followed. The "Catholic Encyclopedia" states as regards the Middle Ages,
The prevailing attitude of Western medieval authors is substantially that of the Greek Fathers.
The wider Christian canon accepted by Augustine became the more established canon in the western Church after being promulgated for use in the Easter Letter of Athanasius (circa 372 A.D.), the Synod of Rome (382 A.D., but its Decretum Gelasianum is generally considered to be a much later addition) and the local councils of Carthage and Hippo in north Africa (391 and 393 A.D). Athanasius called canonical all books of the Hebrew Bible including Baruch, while excluding Esther. He adds that "there are certain books which the Fathers had appointed to be read to catechumens for edification and instruction; these are the Wisdom of Solomon, the Wisdom of Sirach (Ecclesiasticus), Esther, Judith, Tobias, the Didache, or Doctrine of the Apostles, and the Shepherd of Hermas. All others are apocrypha and the inventions of heretics (Festal Epistle for 367)".
Nevertheless, none of these constituted indisputable definitions, and significant scholarly doubts and disagreements about the nature of the Apocrypha continued for centuries and even into Trent, which provided the first infallible definition of the Catholic canon in 1546.
In the 16th century, the Protestant reformers challenged the canonicity of the books and partial-books found in the surviving Septuagint but not in the Masoretic Text. In response to this challenge, after the death of Martin Luther (February 8, 1546) the ecumenical Council of Trent officially ("infallibly") declared these books (called "deuterocanonical" by Catholics) to be part of the canon in April, 1546 A.D. While the Protestant Reformers rejected the parts of the canon that were not part of the Hebrew Bible, they included the four New Testament books Luther considered of doubtful canonicity along with the Apocrypha in his non-binding Luther's canon (although most were separately included in his Bible, as they were in some editions of the KJV bible until 1947).
Protestantism therefore established a 66 book canon with the 39 books based on the ancient Hebrew canon, along with the traditional 27 books of the New Testament. Protestants also rejected the Catholic term "deuterocanonical" for these writings, preferring to apply the term "apocryphal", which was already in use for other early and disputed writings. As today (but along with other reasons), various reformers argued that those books contained doctrinal or other errors and thus should not have been added to the canon for that reason. The differences between canons can be seen under Biblical canon and Development of the Christian biblical canon.
Explaining the Eastern Orthodox Church's canon is made difficult because of differences of perspective with the Roman Catholic church in the interpretation of how it was done. Those differences (in matters of jurisdictional authority) were contributing factors in the separation of the Roman Catholics and Orthodox around 1054, but the formation of the canon that Trent would later officially definitively settle was largely complete by the fifth century, if not settled, six centuries before the separation. In the eastern part of the church, it took much of the fifth century also to come to agreement, but in the end it was accomplished. The canonical books thus established by the undivided church became the predominant canon for what was later to become Roman Catholic and Eastern Orthodox alike.
The East already differed from the West in not considering every question of canon yet settled, and it subsequently adopted a few more books into its Old Testament. It also allowed consideration of yet a few more to continue not fully decided, which led in some cases to adoption in one or more jurisdictions, but not all. Thus, there are today a few remaining differences of canon among Orthodox, and all Orthodox accept a few more books than appear in the Catholic canon. The Psalms of Solomon, 3 Maccabees, 4 Maccabees, the Epistle of Jeremiah, the Book of Odes, the Prayer of Manasseh and Psalm 151 are included in some copies of the Septuagint, some of which are accepted as canonical by Eastern Orthodox and some other churches. Protestants accept none of these additional books as canon, but see them having roughly the same status as the other Apocrypha.
Eastern Orthodoxy uses a different definition than the Roman Catholic Church does for the books of its canon that it calls deuterocanonical, referring to them as a class of books with less authority than other books of the Old Testament. In contrast, the Catholic Church uses this term to refer to a class of books that were added to its canon later than the other books in its Old Testament canon, considering them all of equal authority.
New Testament apocrypha.
New Testament apocrypha—books similar to those in the New Testament but almost universally rejected by Catholics, Orthodox and Protestants—include several gospels and lives of apostles. Some were written by early Jewish Christians (see the Gospel according to the Hebrews). Others of these were produced by Gnostic authors or members of other groups later defined as heterodox. Many texts believed lost for centuries were unearthed in the 19th and 20th centuries, producing lively speculation about their importance in early Christianity among religious scholars, while many others survive only in the form of quotations from them in other writings; for some, no more than the title is known. Artists and theologians have drawn upon the New Testament apocrypha for such matters as the names of Dismas and Gestas and details about the Three Wise Men. The first explicit mention of the perpetual virginity of Mary is found in the pseudepigraphical Infancy Gospel of James.
Before the fifth century, the Christian writings that were then under discussion for inclusion in the canon but had not yet been accepted were classified in a group known as the ancient antilegomenae. These were all candidates for the New Testament and included several books that were eventually accepted, such as: The Epistle to the Hebrews, 2 Peter, 3 John and the Revelation of John (Apocalypse). None of those accepted books can be considered Apocryphal now, since all Christendom accepts them as canonical. Of the uncanonized ones, the Early Church considered some heretical but viewed others quite positively.
Some Christians, in an extension of the meaning, might also consider the non-heretical books to be "apocryphal" along the manner of Martin Luther: not canon, but useful to read. This category includes books such as the Epistle of Barnabas, the Didache, and The Shepherd of Hermas, which are sometimes referred to as the Apostolic Fathers. The Gnostic tradition was a prolific source of apocryphal gospels.
While these writings borrowed the characteristic poetic features of apocalyptic literature from Judaism, Gnostic sects largely insisted on allegorical interpretations based on a secret apostolic tradition. With them, these apocryphal books were highly esteemed. A well-known Gnostic apocryphal book is the Gospel of Thomas, the only complete text of which was found in the Egyptian town of Nag Hammadi in 1945. The Gospel of Judas, a Gnostic gospel, also received much media attention when it was reconstructed in 2006.
Roman Catholics, Eastern Orthodox, and Protestants all agree on the canon of the New Testament. The Ethiopian Orthodox have in the past also included I & II Clement and Shepherd of Hermas in their New Testament canon.
List of Sixty.
The List of Sixty, dating to around the 7th century, lists sixty books that the author claimed were the complete canonical scriptures. The unknown author also lists many apocryphal books that are not included amongst the sixty. These books are:
Islam.
Hadith, the supposed reports of the words, actions, and silent approval of the Islamic prophet Muhammad, are accused by some Muslims of being fabrications (pseudepigrapha) created in the 8th and 9th centuries AD, and falsely attributed to Muhammad. Historically, some sects of the Kharijites also rejected the hadiths, while Mu'tazilites rejected the hadiths as the basis for Islamic law, while at the same time accepting the Sunnah and Ijma. The main points of internal Islamic criticism of hadith literature are based on questions regarding its authenticity. However, Muslim criticism of hadith is also based on arguments and criticisms of Islamic theology and philosophy.
Traditionally, some sects of the Kharijites have rejected Hadith. There are some who even oppose the writing of Hadith for fear that it will compete with or even replace the Quran. Mu'tazilite followers also reject hadith as the basis for Islamic law, while simultaneously accepting the Sunnah and ijma. For Mu'tazilites, the basic argument for rejecting hadith is that "because of its nature as the transmission of individuals, [it] cannot be a sure path to our understanding of the Prophet's teachings, unlike the Quran whose transmission has a general consensus among Muslims". Some Muslim critics of hadith have even gone so far as to completely reject them as fundamental texts of Islamic beliefs and instead adhere solely to Quran. This movement is also known as Quranism.
Taoism.
Prophetic texts called the "Ch'an-wei" were written by Han dynasty (206 BC – AD 220) Taoist priests to legitimize as well as curb imperial power. They deal with treasure objects that were part of the Zhou (1066–256 BC) royal treasures. Emerging from the instability of the Warring States period (476–221 BC), ancient Chinese scholars saw the centralized rule of the Zhou as an ideal model for the new Han empire to emulate.
The "Ch'an-wei" are texts written by Han scholars about the Zhou royal treasures, only they were not written to record history for its own sake, but for legitimizing the current imperial reign. These texts took the form of stories about texts and objects being conferred upon the Emperors by Heaven and comprising these ancient sage-king's (this is how the Zhou emperors were referred to by this time, about 500 years after their peak) royal regalia. The desired effect was to confirm the Han emperor's Heavenly Mandate through the continuity offered by his possession of these same sacred talismans.
It is because of this politicized recording of their history that it is difficult to retrace the exact origins of these objects. What is known is that these texts were most likely produced by a class of literati called the "fangshi". These were a class of nobles who were not part of the state administration; they were considered specialists or occultists, for example diviners, astrologers, alchemists or healers. It is from this class of nobles that the first Taoist priests are believed to have emerged. Seidel points out, however, that the scarcity of sources relating to the formation of early Taoism make the exact link between the apocryphal texts and the Taoist beliefs unclear.
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Antarctic Treaty System
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The Antarctic Treaty and related agreements, collectively known as the Antarctic Treaty System (ATS), regulate international relations with respect to Antarctica, Earth's only continent without a native human population. It was the first arms control agreement established during the Cold War, designating the continent as a scientific preserve, establishing freedom of scientific investigation, and banning military activity; for the purposes of the treaty system, Antarctica is defined as all the land and ice shelves south of 60°S latitude. Since September 2004, the Antarctic Treaty Secretariat, which implements the treaty system, is headquartered in Buenos Aires, Argentina.
The main treaty was opened for signature on 1 December 1959, and officially entered into force on 23 June 1961. The original signatories were the 12 countries active in Antarctica during the International Geophysical Year (IGY) of 1957–58: Argentina, Australia, Belgium, Chile, France, Japan, New Zealand, Norway, South Africa, the Soviet Union, the United Kingdom, and the United States. These countries had established over 55 Antarctic research stations for the IGY, and the subsequent promulgation of the treaty was seen as a diplomatic expression of the operational and scientific cooperation that had been achieved. , the treaty has 58 parties.
History.
1940s.
After World War II, the U.S. considered establishing a claim in Antarctica. From 26 August 1946, and until the beginning of 1947, it carried out Operation Highjump, the largest military expeditionary force that the United States had ever sent to Antarctica, consisting of 13 ships, 4,700 men, and numerous aerial devices. Its goals were to train military personnel and to test material in conditions of extreme cold for a hypothetical war in the Antarctic.
On 2 September 1947, the quadrant of Antarctica in which the United States was interested (between 24° W and 90° W) was included as part of the security zone of the Inter-American Treaty of Reciprocal Assistance, committing its members to defend it in case of external aggression.
In August 1948, the United States proposed that Antarctica be under the guardianship of the United Nations, as a trust territory administered by Argentina, Australia, Chile, France, the United States, the United Kingdom, and New Zealand. This idea was rejected by Argentina, Australia, Chile, France, and Norway. Before the rejection, on 28 August 1948, the United States proposed to the claimant countries some form of internationalization of Antarctica, and the United Kingdom supported this. Chile responded by presenting a plan to suspend all Antarctic claims for five to ten years while negotiating a final solution, but this did not find acceptance.
In 1950, the interest of the United States to keep the Soviet Union away from Antarctica was frustrated, when the Soviets informed the claimant states that they would not accept any Antarctic agreement in which they were not represented. The fear that the USSR would react by making a territorial claim, bringing the Cold War to Antarctica, led the United States to make none.
International conflicts.
Various international conflicts motivated the creation of an agreement for the Antarctic.
Some incidents had occurred during the Second World War, and a new one occurred in Hope Bay on 1 February 1952, when the Argentine military fired warning shots at a group of Britons. The response of the United Kingdom was to send a warship that landed marines at the scene on 4 February. In 1949, Argentina, Chile, and the United Kingdom signed a Tripartite Naval Declaration committing not to send warships south of the 60th parallel south, which was renewed annually until 1961 when it was deemed unnecessary when the treaty entered into force. This tripartite declaration was signed after the tension generated when Argentina sent a fleet of eight warships to Antarctica in February 1948.
On 17 January 1953, Argentina reopened the Lieutenant Lasala refuge on Deception Island, leaving a sergeant and a corporal in the Argentine Navy. On 15 February, in the incident on Deception Island, 32 royal marines landed from the British frigate HMS "Snipe" armed with Sten machine guns, rifles, and tear gas capturing the two Argentine sailors. The Argentine refuge and a nearby uninhabited Chilean shelter were destroyed, and the Argentine sailors were delivered to a ship from that country on 18 February near South Georgia. A British detachment remained three months on the island while the frigate patrolled its waters until April.
On 4 May 1955, the United Kingdom filed two lawsuits, against Argentina and Chile respectively, before the International Court of Justice to declare the invalidity of the claims of the sovereignty of the two countries over Antarctic and sub-Antarctic areas. On 15 July 1955, the Chilean government rejected the jurisdiction of the court in that case, and on 1 August, the Argentine government also did so, so on 16 March 1956, the claims were closed.
In 1956 and 1958, India tried unsuccessfully to bring the Antarctic issue to the United Nations General Assembly.
International Geophysical Year.
In 1950, the International Council of Scientific Unions (ICSU) had discussed the possibility of holding a third International Polar Year. At the suggestion of the World Meteorological Organization, the idea of the International Polar Year was extended to the entire planet, thus creating the International Geophysical Year that took place between 1 July 1957, and 31 December 1958. In this event, 66 countries participated. At the ICSU meeting in Stockholm from 9 to 11 September 1957, the creation of a Special Committee for Antarctic Research (SCAR) was approved, inviting the twelve countries conducting Antarctic investigations to send delegates to integrate the committee, with the purpose of exchanging scientific information among its members regarding Antarctica. The SCAR was later renamed to the Scientific Committee for Research in Antarctica.
Both Argentina and Chile stated that research carried out on the continent during the International Geophysical Year would not give any territorial rights to the participants, and that the facilities that were erected during that year should be dismantled at the end of it. However, in February 1958, the United States proposed that the Antarctic investigations should be extended for another year, and the Soviet Union reported that it would maintain its scientific bases until the studies being carried out had been completed.
Negotiation of the treaty.
Scientific bases increased international tension concerning Antarctica. The danger of the Cold War spreading to that continent caused the President of the United States, Dwight D. Eisenhower, to convene an Antarctic Conference of the twelve countries active in Antarctica during the International Geophysical Year, to sign a treaty. In the first phase, representatives of the twelve nations met in Washington, who met in sixty sessions between June 1958 and October 1959 to define a basic negotiating framework. However, no consensus was reached on a preliminary draft. In the second phase, a conference at the highest diplomatic level was held from 15 October to 1 December 1959, when the Treaty was signed.
The Antarctic Treaty was signed in 1959 by 12 nations and came into effect on 23 June 1961. The central ideas with full acceptance were the freedom of scientific research in Antarctica and the peaceful use of the continent. There was also a consensus for demilitarization and the maintenance of the status quo. The treaty prohibits nuclear testing, military operations, economic exploitation, and territorial claims in Antarctica. It is monitored through on-site inspections. The only permanent structures allowed are scientific research stations. The original signatory countries hold voting rights on Antarctic governance, with seven of them claiming portions of the continent and the remaining five being non-claimants. Other nations have joined as consultative members by conducting significant research in Antarctica. Non-consultative parties can also adhere to the treaty. In 1991–1992, the treaty was renegotiated by 33 nations, with the main change being the Madrid Protocol on Environmental Protection, which prohibited mining and oil exploration for 50 years.
The positions of the United States, the Soviet Union, the United Kingdom, and New Zealand coincided in the establishment of an international administration for Antarctica, proposing that it should be within the framework of the United Nations. Australia and the United Kingdom expressed the need for inspections by observers, and the British also proposed the use of military personnel for logistical functions. Argentina proposed that all atomic explosions be banned in Antarctica, which caused a crisis that lasted until the last day of the conference, since the United States, along with other countries, intended to ban only those that were made without prior notice and without prior consultation. The support of the USSR and Chile for the Argentine proposal finally caused the United States to retract its opposition.
The signing of the treaty was the first arms control agreement that occurred in the framework of the Cold War, and the participating countries managed to avoid the internationalization of Antarctic sovereignty.
Starting from the year 2048, any of the consultative parties to the treaty may request the revision of the treaty and its entire normative system, with the approval of a three-quarters majority of consultative parties needed for the adoption of any changes.
Other agreements.
Other agreements – some 200 recommendations adopted at treaty consultative meetings and ratified by governments – include:
Meetings.
The Antarctic Treaty System's yearly "Antarctic Treaty Consultative Meetings (ATCM)" are the international forum for the administration and management of the region. Only 29 of the 58 parties to the agreements have the right to participate in decision-making at these meetings, though the other 29 are still allowed to attend. The decision-making participants are the "Consultative Parties" and, in addition to the 12 original signatories, including 17 countries that have demonstrated their interest in Antarctica by carrying out substantial scientific activity there. The Antarctic Treaty also has "Special Antarctic Treaty Consultative Meetings (SATCM)", which are generally summoned to treat more important topics but are less frequents and Meetings of Experts.
Parties.
As of 2024, there are 58 states party to the treaty, 29 of which, including all 12 original signatories to the treaty, have consultative (voting) status. The consultative members include the 7 countries that claim portions of Antarctica as their territory. The 51 non-claimant countries do not recognize the claims of others. 42 parties to the Antarctic Treaty have also ratified the "Protocol on Environmental Protection to the Antarctic Treaty".
Antarctic Treaty Secretariat.
The "Antarctic Treaty Secretariat" was established in Buenos Aires, Argentina in September 2004 by the Antarctic Treaty Consultative Meeting (ATCM). Jan Huber (the Netherlands) served as the first Executive Secretary for five years until 31 August 2009. He was succeeded on 1 September 2009, by Manfred Reinke (Germany). Reinke was succeeded by Albert Lluberas (Uruguay), who was elected in June 2017 at the 40th Antarctic Consultative Treaty Meeting in Beijing, China.
The tasks of the Antarctic Treaty Secretariat can be divided into the following areas:
Legal system.
Antarctica currently has no permanent population and therefore it has no citizenship nor government. Personnel present on Antarctica at any time are always citizens or nationals of some sovereignty outside Antarctica, as there is no Antarctic sovereignty. The majority of Antarctica is claimed by one or more countries, but most countries do not explicitly recognize those claims. The area on the mainland between 90 degrees west and 150 degrees west is the only major land on Earth not claimed by any country. Until 2015 the interior of the Norwegian Sector, the extent of which had never been officially defined, was considered to be unclaimed. That year, Norway formally laid claim to the area between its Queen Maud Land and the South Pole.
Governments that are party to the Antarctic Treaty and its Protocol on Environmental Protection implement the articles of these agreements, and decisions taken under them, through national laws. These laws generally apply only to their own citizens, wherever they are in Antarctica, and serve to enforce the consensus decisions of the consultative parties: about which activities are acceptable, which areas require permits to enter, what processes of environmental impact assessment must precede activities, and so on. The Antarctic Treaty is often considered to represent an example of the common heritage of mankind principle.
Australia.
Since the designation of the Australian Antarctic Territory pre-dated the signing of the Antarctic Treaty, Australian laws that relate to Antarctica date from more than two decades before the Antarctic Treaty era. In terms of criminal law, the laws that apply to the Jervis Bay Territory (which follows the laws of the Australian Capital Territory) apply to the Australian Antarctic Territory. Key Australian legislation applying Antarctic Treaty System decisions include the "Antarctic Treaty Act 1960", the "Antarctic Treaty (Environment Protection) Act 1980" and the "Antarctic Marine Living Resources Conservation Act 1981".
United States.
The law of the United States, including certain criminal offences by or against U.S. nationals, such as murder, may apply to areas not under jurisdiction of other countries. To this end, the United States now stations special deputy U.S. Marshals in Antarctica to provide a law enforcement presence.
Some U.S. laws directly apply to Antarctica. For example, the Antarctic Conservation Act, Public Law 95-541, "et seq.", provides civil and criminal penalties for the following activities, unless authorized by regulation or statute:
Violation of the Antarctic Conservation Act carries penalties of up to US$10,000 in fines and one year in prison. The Departments of the Treasury, Commerce, Transportation, and the Interior share enforcement responsibilities. The Act requires expeditions from the U.S. to Antarctica to notify, in advance, the Office of Oceans and Polar Affairs of the State Department, which reports such plans to other nations as required by the Antarctic Treaty. Further information is provided by the Office of Polar Programs of the National Science Foundation.
New Zealand.
In 2006, the New Zealand police reported that jurisdictional issues prevented them issuing warrants for potential American witnesses who were reluctant to testify during the Christchurch Coroner's investigation into the death by poisoning of Australian astrophysicist Rodney Marks at the South Pole base in May 2000. Marks died while wintering over at the United States' Amundsen–Scott South Pole Station located at the geographic South Pole. Prior to autopsy, the death was attributed to natural causes by the National Science Foundation and the contractor administering the base. However, an autopsy in New Zealand revealed that Marks died from methanol poisoning. The New Zealand Police launched an investigation. In 2006, frustrated by lack of progress, the Christchurch Coroner said that it was unlikely that Marks ingested the methanol knowingly, although there is no certainty that he died as the direct result of the act of another person. During media interviews, the police detective in charge of the investigation criticized the National Science Foundation and contractor Raytheon for failing to cooperate with the investigation.
South Africa.
Under the South African Citizens in Antarctica Act, 1962, South African law applies to all South African citizens in Antarctica, and they are subject to the jurisdiction of the magistrate's court in Cape Town. The Antarctic Treaties Act, 1996 incorporates the Antarctic Treaty and related agreements into South African law. In regard to violations of these treaties, South Africa also asserts jurisdiction over South African residents and members of expeditions organised in South Africa.
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Alfred Lawson
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Alfred William Lawson (March 24, 1869 – November 29, 1954) was an English-born professional baseball player, aviator, and utopian philosopher. He played baseball, managed and promoted leagues from 1887 through 1916, and pioneered the U.S. aircraft industry. He also published two early aviation trade journals.
Lawson is frequently cited as the inventor of the airliner and received several of the first air mail contracts, which he ultimately did not fulfill. He founded the Lawson Aircraft Company in Green Bay, Wisconsin, to build military training aircraft and later the Lawson Airplane Company in South Milwaukee, Wisconsin, to build airliners.
The crash of his ambitious Lawson L-4 "Midnight Liner" during its trial flight takeoff on May 8, 1921, ended his best chance for commercial aviation success.
In 1904, he wrote a utopian novel, "Born Again", in which he developed the philosophy which later became Lawsonomy.
Baseball career (1888–1907).
Lawson made one start for the Boston Beaneaters and two for the Pittsburgh Alleghenys during the 1890 season. His minor league playing career lasted through 1895. Lawson later managed in the minors from 1905 to 1907.
Union Professional League.
In 1908, Lawson started a new professional baseball league called the Union Professional League. The league took the field in April but folded one month later because of financial difficulties.
Aviation career (1908–1928).
An early aviation advocate, in October 1908, Lawson started the magazine "Fly" to stimulate public interest and educate readers on the new aviation science fundamentals. It sold for 10 cents a copy from newsstands across the country. In 1910, moving to New York City, he renamed the magazine "Aircraft" and published it until 1914. The magazine chronicled the technical developments of the early aviation pioneers.
Lawson was the first advocate for commercial air travel, coining the term "airline." He also advocated for a strong American flying force, lobbying Congress in 1913 to expand its appropriations for Army aircraft.
In early 1913, Lawson learned to fly the Sloan-Deperdussin and the Moisant-Bleriot monoplanes, becoming an accomplished pilot. Later that year, he bought a Thomas flying boat and became the first air commuter to regularly fly from his country house in Seidler's Beach, New Jersey, to the foot of 75th Street in New York City (about 35 miles).
In 1917, utilizing the knowledge gained from ten years of advocating aviation, he built his first airplane, the Lawson Military Tractor 1 (MT-1) trainer, and founded the Lawson Aircraft Corporation. The company's plant was in Green Bay, Wisconsin. There, Lawson secured a contract and built the Lawson MT-2. He also designed the steel fuselage Lawson Armored Battler, which never got beyond the drafting board, given doubts within the Army aviation community and the signing of the armistice.
After the war, in 1919, Lawson started a project to build America's first airline. He secured financial backing, and in five months, he had built and demonstrated in flight his biplane airliner, the 18-passenger Lawson L-2. He demonstrated its capabilities in a 2000-mile multi-city tour from Milwaukee to Chicago-Toledo-Cleveland-Buffalo-Syracuse-New York City-Washington, D.C.-Collinsville-Dayton-Chicago and back to Milwaukee, creating a buzz of positive press.
The publicity allowed Lawson to secure an additional $1 million to build the 26-passenger Midnight Liner. The aircraft crashed on takeoff on its maiden flight.
In late 1920, he secured government contracts for three airmail routes and to deliver ten warplanes. However, because of the fall 1920 recession, he could not secure the necessary $100,000 in cash reserves and had to decline the contracts.
In 1926, he started his last airliner, the 56-seat, two-tier Lawson super airliner.
In this phase of his life, he was considered one of the leading thinkers in the budding American commercial aviation community; however, his inability to secure financial backing for his ideas led him to turn to economics, philosophy, and organization.
Lawsonomy (1929–1954).
In the 1920s, Lawson promoted health practices, including vegetarianism, and claimed to have found the secret of living to 200. He also developed his own highly unusual theories of physics, according to which such concepts as "penetrability", "suction and pressure" and "zig-zag-and-swirl" were discoveries on par with Einstein's theory of relativity. He published numerous books on these concepts, all set in a distinctive typography.
He later propounded a philosophy, Lawsonomy, and the Lawsonian religion. He also developed, during the Great Depression, the populist economic theory of "Direct Credits", according to which banks are the cause of all economic woes, the oppressors of both capital and labor. Lawson believed that the government should replace banks as the provider of loans to business and workers. He predicted the worldwide adoption of Lawsonian principles once "everybody understands this subject". His rallies and lectures attracted thousands of listeners in the early 1930s, mainly in the upper Midwest, but by the late 1930s the crowds had dwindled.
His claims about his greatness became increasingly hyperbolic. The "Lawsonomy trilogy", which Lawson considered his intellectual masterpiece, is replete with such self-referential statements as "About every two thousand years a new teacher with advanced intellectual equipment appears upon earth to lead the people a step or two nearer the one God of everybody".
In 1943, he founded the Humanity Benefactor Foundation and University of Lawsonomy in Des Moines, on the site of Des Moines University, to spread his teachings and offer the degree of "Knowledgian", but after various IRS and other investigations it was closed and finally sold in 1954, the year of Lawson's death. His financial arrangements remain mysterious to this day, and in later years, he seems to have owned little property, moving from city to city as a guest of his far-flung acolytes. In 1952, he testified before a United States Senate investigative committee on allegations that his organization had bought war surplus machines and then sold them for a profit despite claiming non-profit status. His attempt to explain Lawsonomy to the senators ended in mutual frustration and bafflement.
A farm near Racine, Wisconsin, is the only remaining university facility, although a tiny handful of churches may yet survive in places such as Wichita, Kansas. The large sign, formerly reading "University of Lawsonomy", was a familiar landmark for motorists in the region for many years and was visible from Interstate 94 about north of the Illinois state line, on the east side of the highway. A storm in the spring of 2009 destroyed the sign, although the supporting posts are still visible. On the northbound side of Interstate 94, a sign on the roof of the building nearest the freeway said "Study Natural Law" until being shingled over in October 2014.
In 2018, the Town of Mount Pleasant paid $933,000 to purchase the property on the northbound side of Interstate 94 for the Foxconn project. All remaining buildings were demolished and removed. Lawsonomy maintains a small following to this day.
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Ames, Iowa
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Ames () is a city in Story County, Iowa, United States, located approximately north of Des Moines in central Iowa. It is the home of Iowa State University (ISU). According to the 2020 census, Ames had a population of 66,427, making it the state's ninth-most populous city. Iowa State University was home to 30,177 students as of fall 2023, which make up approximately one half of the city's population.
A United States Department of Energy national laboratory, Ames Laboratory, is located on the ISU campus. Ames also hosts United States Department of Agriculture (USDA) sites: the largest federal animal disease center in the United States, the USDA Agricultural Research Service's National Animal Disease Center (NADC), as well as one of two national USDA sites for the Animal and Plant Health Inspection Service (APHIS), which comprises the National Veterinary Services Laboratory and the Center for Veterinary Biologics. Ames also hosts the headquarters of the Iowa Department of Transportation.
History.
The city was founded in 1864 as a station stop on the Cedar Rapids and Missouri Railroad and was named after 19th century U.S. Congressman Oakes Ames of Massachusetts, who was influential in the building of the transcontinental railroad. Ames was founded by local resident Cynthia Olive Duff (née Kellogg) and railroad magnate John Insley Blair, near a location that was deemed favorable for a railroad crossing of the Skunk River and Ioway Creek. William West (1821–1919) became the first mayor of Ames in 1870. With his wife Harriet, from 1869 to 1892, he ran Ames's first hotel, known as West House, on Douglas Avenue on the site of the present Octagon Center for the Arts. West was a highly respected pioneer businessman who also served on the Ames School Board in the 1880s when Central School was built on the site of the present Ames City Hall on Clark Avenue and Sixth Street. The Wests raised several daughters and sons. William West spent the last of his life living with his son in northwest Iowa.
Geography.
Ames is located along the western edge of Story County, roughly north of the state capital, Des Moines. Passing through Ames is the cross country line of the Union Pacific Railroad and two small streams (the South Skunk River and Ioway Creek).
According to the United States Census Bureau, the city has a total area of , of which is land and is water.
Climate.
Ames has a humid continental climate (Köppen climate classification "Dfa"). On average, the warmest month is July and the coldest is January. The highest recorded temperature was on July 24, 1901, and the lowest was January 25, 1894.
Demographics.
2020 census.
As of the census of 2020, there were 66,427 people, 25,579 households, and 10,641 families residing in the city. The population density was 2,407.5 inhabitants per square mile (929.5/km2). There were 27,806 housing units at an average density of 1,007.8 per square mile (389.1/km2). The racial makeup of the city was 77.5% White, 4.2% Black or African American, 0.3% Native American, 7.9% Asian, 0.0% Pacific Islander, 3.1% from other races and 6.9% from two or more races. Hispanic or Latino persons of any race comprised 5.9% of the population.
Of the 25,579 households, 17.5% of which had children under the age of 18 living with them, 32.5% were married couples living together, 6.8% were cohabiting couples, 29.5% had a female householder with no spouse or partner present and 31.2% had a male householder with no spouse or partner present. 58.4% of all households were non-families. 35.9% of all households were made up of individuals, 8.1% had someone living alone who was 65 years old or older.
The median age in the city was 23.6 years. 26.3% of the residents were under the age of 20; 27.7% were between the ages of 20 and 24; 22.4% were from 25 and 44; 12.8% were from 45 and 64; and 10.8% were 65 years of age or older. The gender makeup of the city was 53.0% male and 47.0% female.
2010 census.
As of the census of 2010, there were 58,965 people, 22,759 households, and 9,959 families residing in the city. The population density was . There were 23,876 housing units at an average density of . The racial makeup of the city was 84.5% White, 3.4% African American, 0.2% Native American, 8.8% Asian, 1.1% from other races, and 2.0% from two or more races. Hispanic or Latino of any race were 3.4% of the population.
There were 22,759 households, of which 19.1% had children under the age of 18 living with them, 35.6% were married couples living together, 5.4% had a female householder with no husband present, 2.7% had a male householder with no wife present, and 56.2% were non-families. 30.5% of all households were made up of individuals, and 6.2% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.82.
The median age in the city was 23.8 years. 13.4% of residents were under the age of 18; 40.5% were between the ages of 18 and 24; 22.9% were from 25 to 44; 15% were from 45 to 64; and 8.1% were 65 years of age or older. The gender makeup of the city was 53.0% male and 47.0% female.
2000 census.
As of the census of 2000, there were 50,731 people, 18,085 households, and 8,970 families residing in the city. The population density was . There were 18,757 housing units at an average density of . The racial makeup of the city was 87.34% White, 7.70% Asian, 2.65% African American, 0.04% Native American, 0.76% Pacific Islander and other races, and 1.36% from two or more races. Hispanic or Latino of any race were 1.98% of the population.
There were 18,085 households, out of which 22.3% had children under the age of 18 living with them, 42.0% were married couples living together, 5.3% had a female householder with no husband present, and 50.4% were non-families. 28.5% of all households were made up of individuals, and 5.9% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 2.85.
Age spread: 14.6% under the age of 18, 40.0% from 18 to 24, 23.7% from 25 to 44, 13.9% from 45 to 64, and 7.7% who were 65 years of age or older. The median age was 24 years. For every 100 females, there were 109.3 males. For every 100 females age 18 and over, there were 109.9 males.
The median income for a household in the city was $36,042, and the median income for a family was $56,439. Males had a median income of $37,877 versus $28,198 for females. The per capita income for the city was $18,881. About 7.6% of families and 20.4% of the population were below the poverty line, including 9.2% of those under age 18 and 4.1% of those age 65 or over.
Metropolitan area.
The U.S. Census Bureau designates the Ames MSA as encompassing all of Story County. While Ames is the largest city in Story County, the county seat is in the nearby city of Nevada, east of Ames.
Ames metropolitan statistical area combined with the Boone, Iowa micropolitan statistical area (Boone County, Iowa) make up the larger Ames-Boone combined statistical area. Ames is the larger principal city of the Combined Statistical Area that includes all of Story County, Iowa and Boone County, Iowa. which had a combined population of 106,205 at the 2000 census.
Economy.
Iowa State University contains the U.S. Department of Agriculture's National Animal Disease Center, which developed the Ames strain), and the U.S. Department of Energy's Ames Laboratory, a major materials research and development facility.
Located in Ames are the main offices of the Iowa Department of Transportation, and state and Federal institutions are the largest employers in Ames.
The Iowa State University Research Park is a not-for-profit business development incubator located in Ames, and affiliated with Iowa State University.
The Bureau of Labor Statistics ranked Ames and Boulder, Colorado as having the lowest unemployment rate (2.5%) of any metropolitan area in the United States in 2016. By June 2018, unemployment in Ames had fallen even further, to 1.5%, though wage increases for workers were not keeping pace with rising rents.
Top employers.
As of 2022, the top employers in the city are:
Sports.
The Iowa State Cyclones play a variety of sports in the Ames area. The Iowa State Cyclones football team plays at Jack Trice Stadium in Ames. The Cyclones' Men's and Women's Basketball teams and Volleyball teams play at Hilton Coliseum. The Iowa State Cyclones are a charter member of the Big 12 Conference in all sports and compete in NCAA Division I-A.
Parks and recreation.
Ames has multiple parks, including Brookside Park, River Valley Park and the Ada Hayden Heritage Park, which contains a lake, a series of wetlands and trails. Reiman Gardens, owned by Iowa State University, is a public garden located in Ames.
Government.
From 1979 through 2011, Ames was the location of the Ames Straw Poll, which was held every August prior to a presidential election year in which the Republican presidential nomination was undecided (meaning there was no Republican president running for re-election—as in 2011, 2007, 1999, 1995, 1987, and 1979). The poll would gauge support for the various Republican candidates amongst attendees of a fundraising dinner benefiting the Iowa Republican Party. The straw poll was frequently seen by national media and party insiders as a first test of organizational strength in Iowa. In 2015, the straw poll was to be moved to nearby Boone before the Iowa Republican Party eventually decided to cancel it altogether.
Ames is part of Iowa House of Representatives District 50, currently represented by Ross Wilburn. It is part of Iowa Senate District 25, currently represented by Herman Quirmbach.
Education.
Schools located in Ames are administered by the Ames Community School District.
Iowa State University.
Founded in 1856, Iowa State University is a public research university located in Ames. The university is a member of the American Association of Universities and the Big 12 Conference. ISU was the first designated land-grant university in the United States.
Notable buildings on the university campus include the Farm House Museum, Beardshear Hall, Morrill Hall, Memorial Union, Catt Hall, Curtiss Hall, Carver Hall, Parks Library, the Campanile, Hilton Coliseum, C.Y. Stephens Auditorium, Fisher Theater, Jack Trice Stadium, Lied Recreation Center, and numerous residence halls.
Media.
Radio stations licensed to Ames.
Ames is also served by stations in the Des Moines media market, which includes Clear Channel's 50,000-watt talk station WHO, music stations KAZR, KDRB, KGGO, KKDM, KHKI, KIOA, KJJY, KRNT, KSPZ and KSTZ, talk station KWQW, and sports stations KXNO and KXNO-FM.
Television.
Ames is served by the Des Moines media market. WOI-DT, the ABC affiliate in central Iowa, was originally owned and operated by Iowa State University until the 1990s. The station is licensed to Ames, with studio's located in West Des Moines. Other stations serving Ames include KCCI, KDIN-TV, WHO-DT, KCWI-TV, KDMI, KDSM-TV and KFPX-TV.
Channel 12 is owned by the City of Ames, broadcasting city council meetings and local events. The station has received a NATOA Government Programming Award and a Telly Award.
Channel 16 is a public access TV channel.
Infrastructure.
Transportation.
Highways include U.S. Highways 30, 69 and Interstate 35.
Ames Municipal Airport is located southeast of the city.
CyRide is a local bus system, and Jefferson Lines is an intercity bus.
Ames is home to the headquarters of the Iowa Department of Transportation.
Health care.
Ames is served by Mary Greeley Medical Center, a 220-bed regional hospital.
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Abalone
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Abalone ( or ; via Spanish , from Rumsen "aulón") is a common name for any small to very large marine gastropod mollusc in the family Haliotidae, which once contained six genera but now contains only one genus, "Haliotis". Other common names are ear shells, sea ears, and, now rarely, muttonfish or muttonshells in parts of Australia, ormer in the United Kingdom, perlemoen in South Africa, and pāua in New Zealand. The number of abalone species recognized worldwide ranges between 30 and 130 with over 230 species-level taxa described. The most comprehensive treatment of the family considers 56 species valid, with 18 additional subspecies.
The shells of abalone have a low, open spiral structure, and are characterized by several open respiratory pores in a row near the shell's outer edge. The thick inner layer of the shell is composed of nacre, which in many species is highly iridescent, giving rise to a range of strong, changeable colors which make the shells attractive to humans as ornaments, jewelry, and as a source of colorful mother-of-pearl.
The flesh of abalone is widely considered to be a delicacy, and is consumed raw or cooked by a variety of cuisines.
Description.
Most abalone vary in size from ("Haliotis pulcherrima") to . The largest species, "Haliotis rufescens", reaches .
The shell of abalone is convex, rounded to oval in shape, and may be highly arched or very flattened. The shell of the majority of species has a small, flat spire and two to three whorls. The last whorl, known as the body whorl, is auriform, meaning that the shell resembles an ear, giving rise to the common name "ear shell". "Haliotis asinina" has a somewhat different shape, as it is more elongated and distended. The shell of "Haliotis cracherodii cracherodii" is also unusual as it has an ovate form, is imperforate, shows an exserted spire, and has prickly ribs.
A mantle cleft in the shell impresses a groove in the shell, in which are the row of holes characteristic of the genus. These holes are respiratory apertures for venting water from the gills and for releasing sperm and eggs into the water column. They make up what is known as the selenizone, which forms as the shell grows. This series of eight to 38 holes is near the anterior margin. Only a small number is generally open. The older holes are gradually sealed up as the shell grows and new holes form. Each species has a typical number of open holes, between four and 10, in the selenizone. An abalone has no operculum. The aperture of the shell is very wide and nacreous.
The exterior of the shell is striated and dull. The color of the shell is very variable from species to species, which may reflect the animal's diet. The iridescent nacre that lines the inside of the shell varies in color from silvery white, to pink, red and green-red to deep blue, green to purple.
The animal has fimbriated head lobes and side lobes that are fimbriated and cirrated. The radula has small median teeth, and the lateral teeth are single and beam-like. They have about 70 uncini, with denticulated hooks, the first four very large. The rounded foot is very large in comparison to most molluscs. The soft body is coiled around the columellar muscle, and its insertion, instead of being on the columella, is on the middle of the inner wall of the shell. The gills are symmetrical and both well developed.
These snails cling solidly with their broad, muscular foot to rocky surfaces at sublittoral depths, although some species such as "Haliotis cracherodii" used to be common in the intertidal zone. Abalone reach maturity at a relatively small size. Their fecundity is high and increases with their size, laying from 10,000 to 11 million eggs at a time. The spermatozoa are filiform and pointed at one end, and the anterior end is a rounded head.
Distribution.
The haliotid family has a worldwide distribution, along the coastal waters of every continent, except the Pacific coast of South America, the Atlantic coast of North America, the Arctic, and Antarctica. The majority of abalone species are found in cold waters, such as off the coasts of New Zealand, South Africa, Australia, Western North America, and Japan.
Structure and properties of the shell.
The shell of the abalone is exceptionally strong and is composed of a tightly packed calcium carbonate matrix. Layered among the matrix is an endogenous protein further strengthening the shell. Due to the unique structure of the shell, a force applied directly to the shell matrix will more likely cause the shedding of layers as opposed to cracking or shattering. Material scientists are currently studying this structure for insight into stronger ablative protective tools such as body armor.
The dust created by grinding and cutting abalone shell is dangerous; appropriate safeguards must be taken to protect people from inhaling these particles.
Diseases and pests.
Abalone are subject to various infectious diseases. The Victorian Department of Primary Industries said in 2007 that ganglioneuritis killed up to 90% of stock in affected regions. Abalone possess very little clotting factor, meaning even a mild to moderate skin-piercing injury can result in death from fluid loss. Members of the Spionidae of the polychaetes are known as pests of abalone.
Human use.
Abalone have been harvested as a source of food and esthetics since prehistory. Abalone shells and associated materials, like their claw-like pearls and nacre, have been used as jewelry and for buttons, buckles, and inlay. These shells have been found in archaeological sites around the world, ranging from 100,000-year-old deposits at Blombos Cave in South Africa to historic Chinese abalone middens on California's Northern Channel Islands. For at least 12,000 years, abalone were harvested to such an extent around the Channel Islands that shells in the area decreased in size four thousand years ago.
Farming.
Farming of abalone began in the late 1950s and early 1960s in Japan and China. Since the mid-1990s, there have been many increasingly successful endeavors to commercially farm abalone for the purpose of consumption. Overfishing and poaching have reduced wild populations to such an extent that farmed abalone now supplies most of the abalone meat consumed. The principal abalone farming regions are China, Taiwan, Japan, and Korea. Abalone is also farmed in Australia, Canada, Chile, France, Iceland, Ireland, Mexico, Namibia, New Zealand, South Africa, Spain, Thailand, and the United States.
After trials in 2012, a commercial "sea ranch" was set up in Flinders Bay, Western Australia to raise abalone. The ranch is based on an artificial reef made up of 5,000 separate concrete abalone habitat units, which can host 400 abalone each. The reef is seeded with young abalone from an onshore hatchery.
The abalone feed on seaweed that grows naturally on the habitats; the ecosystem enrichment of the bay also results in growing numbers of dhufish, pink snapper, wrasse, and Samson fish among other species.
Consumption.
Abalone have long been a valuable food source for humans in every area of the world where a species is abundant. The meat of this mollusc is considered a delicacy in certain parts of Latin America (particularly Chile), France, New Zealand, East Asia and Southeast Asia. In the Greater China region and among Overseas Chinese communities, abalone is commonly known as "bao yu", and sometimes forms part of a Chinese banquet. In the same way as shark fin soup or bird's nest soup, abalone is considered a luxury item, and is traditionally reserved for celebrations.
As abalone became more popular and less common, the prices adjusted accordingly. In the 1920s, a restaurant-served portion of abalone, about 4 ounces, would cost (in inflation adjusted dollars) about US$7; by 2004, the price had risen to US$75. In the United States, prior to this time, abalone was predominantly eaten, gathered, and prepared by Chinese immigrants. Before that, abalone were collected to be eaten, and used for other purposes by Native American tribes. By 1900, laws were passed in California to outlaw the taking of abalone above the intertidal zone. This forced the Chinese out of the market and the Japanese perfected diving, with or without gear, to enter the market. Abalone started to become popular in the US after the Panama–Pacific International Exposition in 1915, which exhibited 365 varieties of fish with cooking demonstrations, and a 1,300-seat dining hall.
In Japan, live and raw abalone are used in awabi sushi, or served steamed, salted, boiled, chopped, or simmered in soy sauce. Salted, fermented abalone entrails are the main component of "tottsuru", a local dish from Honshū. "Tottsuru" is mainly enjoyed with sake.
In South Korea, abalone is called "Jeonbok" (/juhn-bok/) and used in various recipes. "Jeonbok" porridge and pan-fried abalone steak with butter are popular but also commonly used in soups or ramyeon.
In California, abalone meat can be found on pizza, sautéed with caramelized mango, or in steak form dusted with cracker meal and flour.
Sport harvesting.
Australia.
Tasmania supplies about 25% of the yearly world abalone harvest. Around 12,500 Tasmanians recreationally fish for blacklip and greenlip abalone. For blacklip abalone, the size limit varies between for the southern end of the state and for the northern end of the state. Greenlip abalone have a minimum size of , except for an area around Perkins Bay in the north of the state where the minimum size is . With a recreational abalone licence, the bag limit is 10 per day, with a total possession limit of 20. Scuba diving for abalone is allowed, and has a rich history in Australia. (Scuba diving for abalone in the states of New South Wales and Western Australia is illegal; a free-diving catch limit of two is allowed).
Victoria has had an active abalone fishery since the late 1950s. The state is sectioned into three fishing zones, Eastern, Central and Western, with each fisher required a zone-allocated licence. Harvesting is performed by divers using surface-supplied air "hookah" systems operating from runabout-style, outboard-powered boats. While the diver seeks out colonies of abalone amongst the reef beds, the deckhand operates the boat, known as working "live" and stays above where the diver is working. Bags of abalone pried from the rocks are brought to the surface by the diver or by way of "shot line", where the deckhand drops a weighted rope for the catch bag to be connected then retrieved. Divers measure each abalone before removing from the reef and the deckhand remeasures each abalone and removes excess weed growth from the shell. Since 2002, the Victorian industry has seen a significant decline in catches, with the total allowable catch reduced from 1440 to 787 tonnes for the 2011/12 fishing year, due to dwindling stocks and most notably the abalone virus ganglioneuritis, which is fast-spreading and lethal to abalone stocks.
United States.
Sport harvesting of red abalone is permitted with a California fishing license and an abalone stamp card. In 2008, the abalone card also came with a set of 24 tags. This was reduced to 18 abalone per year in 2014, and as of 2017 the limit has been reduced to 12, only nine of which may be taken south of Mendocino County. Legal-size abalone must be tagged immediately. Abalone may only be taken using breath-hold techniques or shorepicking; scuba diving for abalone is strictly prohibited. Taking of abalone is not permitted south of the mouth of San Francisco Bay. A size minimum of measured across the shell is in place. A person may be in possession of only three abalone at any given time.
As of 2017, abalone season is May to October, excluding July. Transportation of abalone may only legally occur while the abalone is still attached in the shell. Sale of sport-obtained abalone is illegal, including the shell. Only red abalone may be taken, as black, white, pink, flat, green, and pinto abalone are protected by law. In 2018, the California Fish and Game Commission closed recreational abalone season due to dramatically declining populations. That year, they extended the moratorium to last through April 2021. Afterwards, they extended the ban for another 5 years until April 2026.
An abalone diver is normally equipped with a thick wetsuit, including a hood, bootees, and gloves, and usually also a mask, snorkel, weight belt, abalone iron, and abalone gauge. Alternatively, the rock picker can feel underneath rocks at low tides for abalone. Abalone are mostly taken in depths from a few inches up to ; less common are freedivers who can work deeper than . Abalone are normally found on rocks near food sources such as kelp. An abalone iron is used to pry the abalone from the rock before it has time to fully clamp down. Divers dive from boats, kayaks, tube floats, or directly off the shore.
The largest abalone recorded in California is , caught by John Pepper somewhere off the coast of San Mateo County in September 1993.
The mollusc "Concholepas concholepas" is often sold in the United States under the name "Chilean abalone", though it is not an abalone, but a muricid.
New Zealand.
In New Zealand, abalone is called "pāua" (, from the Māori language). "Haliotis iris" (or blackfoot pāua) is the ubiquitous New Zealand pāua, the highly polished nacre of which is extremely popular as souvenirs with its striking blue, green, and purple iridescence. "Haliotis australis" and "Haliotis virginea" are also found in New Zealand waters, but are less popular than "H. iris". "Haliotis pirimoana" is a small species endemic to Manawatāwhi / the Three Kings Islands that superficially resembles "H. virginea".
Like all New Zealand shellfish, recreational harvesting of "pāua" does not require a permit provided catch limits, size restrictions, and seasonal and local restrictions set by the Ministry for Primary Industries (MPI) are followed. The legal recreational daily limit is 10 per diver, with a minimum shell length of for "H. iris" and for "H. australis". In addition, no person may be in possession, even on land, of more than 20 pāua or more than of pāua meat at any one time. Pāua can only be caught by free-diving; it is illegal to catch them using scuba gear.
An extensive global black market exists in collecting and exporting abalone meat. This can be a particularly awkward problem where the right to harvest pāua can be granted legally under Māori customary rights. When such permits to harvest are abused, it is frequently difficult to police. The limit is strictly enforced by roving Ministry for Primary Industries fishery officers with the backing of the New Zealand Police. Poaching is a major industry in New Zealand with many thousands being taken illegally, often undersized. Convictions have resulted in seizure of diving gear, boats, and motor vehicles and fines and in rare cases, imprisonment.
South Africa.
There are five species endemic to South Africa, namely "H. parva", "H. spadicea", "H. queketti" and "H. speciosa".
The largest abalone in South Africa, "Haliotis midae", occurs along roughly two-thirds of the country's coastline. Abalone-diving has been a recreational activity for many years, but stocks are currently being threatened by illegal commercial harvesting. In South Africa, all persons harvesting this shellfish need permits that are issued annually, and no abalone may be harvested using scuba gear.
For the last few years, however, no permits have been issued for collecting abalone, but commercial harvesting still continues as does illegal collection by syndicates.
In 2007, because of widespread poaching of abalone, the South African government listed abalone as an endangered species according to the CITES section III appendix, which requests member governments to monitor the trade in this species. This listing was removed from CITES in June 2010 by the South African government and South African abalone is no longer subject to CITES trade controls. Export permits are still required, however.
The abalone meat from South Africa is prohibited for sale in the country to help reduce poaching; however, much of the illegally harvested meat is sold in Asian countries. As of early 2008, the wholesale price for abalone meat was approximately US$40.00 per kilogram. There is an active trade in the shells, which sell for more than US$1,400 per tonne.
Channel Islands, Brittany and Normandy.
Ormers ("Haliotis tuberculata") are considered a delicacy in the British Channel Islands as well as in adjacent areas of France, and are pursued with great alacrity by the locals. This, and a recent lethal bacterial disease, has led to a dramatic depletion in numbers since the latter half of the 19th century, and "ormering" is now strictly regulated to preserve stocks. The gathering of ormers is now restricted to a number of 'ormering tides', from 1 January to 30 April, which occur on the full or new moon and two days following. No ormers may be taken from the beach that are under in shell length. Gatherers are not allowed to wear wetsuits or even put their heads underwater. Any breach of these laws is a criminal offence and can lead to a fine of up to £5,000 or six months in prison. The demand for ormers is such that they led to the world's first underwater arrest, when Mr. Kempthorne-Leigh of Guernsey was arrested by a police officer in full diving gear when illegally diving for ormers.
Decorative items.
The highly iridescent inner nacre layer of the shell of abalone has traditionally been used as a decorative item, in jewelry, buttons, and as inlay in furniture and musical instruments, such as on fret boards and binding of guitars. See article Najeonchilgi regarding Korean handicraft.
Indigenous use.
Abalone has been an important staple in a number of Indigenous cultures around the world, specifically in Africa and on the Northwest American coast. The meat is a traditional food, and the shell is used to make ornaments; historically, the shells were also used as currency in some communities.
Threat of extinction.
Abalone are critically threatened due to overfishing and the acidification of oceans as lower pH erodes the calcium carbonate in their shells. In the 21st century, white, pink, and green abalone are on the United States federal endangered species list. Possible restoration sites have been proposed for the San Clemente Island and Santa Barbara Island areas. Reintroduction of farming abalone to the wild has been proposed, with these abalone having special tags to help track the population.
Species.
The number of species that are recognized within the genus "Haliotis" has fluctuated over time, and depends on the source that is consulted. The number of recognized species range from 30 to 130. This list finds a compromise using the WoRMS database, plus some species that have been added, for a total of 57. The majority of abalone have not been rated for conservation status. Those that have been reviewed tend to show that the abalone in general is an animal that is declining in numbers, and will need protection throughout the globe.
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Abbess
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An abbess (Latin: "abbatissa") is the female superior of a community of nuns in an abbey.
Description.
In the Catholic Church (both the Latin Church and Eastern Catholic), Eastern Orthodox, Coptic, Lutheran and Anglican abbeys, the mode of election, position, rights, and authority of an abbess correspond generally with those of an abbot. She must be at least 40 years old and have been a nun for 10 years. The age requirement in the Catholic Church has evolved over time, ranging from 30 to 60. The requirement of 10 years as a nun is only eight in Catholicism. In the rare case of there not being a nun with the qualifications, the requirements may be lowered to 30 years of age and five of those in an "upright manner", as determined by the superior. A woman who is of illegitimate birth, is not a virgin, has undergone non-salutory public penance, is a widow, or is blind or deaf, is typically disqualified for the position, saving by permission of the Holy See. The office is elective, the choice being by the secret votes of the nuns belonging to the community. Like an abbot, after being confirmed in her office by the Holy See, an abbess is solemnly admitted to her office by a formal blessing, conferred by the bishop in whose territory the monastery is located, or by an abbot or another bishop with appropriate permission. Unlike the abbot, the abbess receives only the ring, the crosier, and a copy of the rule of the order. She does not receive a mitre as part of the ceremony. The abbess also traditionally adds a pectoral cross to the outside of her habit as a symbol of office, though she continues to wear a modified form of her religious habit or dress, as she is unordained—females cannot be ordained—and so does not vest or use choir dress in the liturgy. An abbess serves for life, except in Italy and some adjacent islands.
Roles and responsibilities.
Abbesses are, like abbots, major superiors according to canon law, the equivalents of abbots or bishops (the ordained male members of the church hierarchy who have, by right of their own office, executive jurisdiction over a building, diocesan territory, or a communal or non-communal group of persons—juridical entities under church law). They receive the vows of the nuns of the abbey; they may admit candidates to their order's novitiate; they may send them to study; and they may send them to do pastoral or missionary, or to work or assist—to the extent allowed by canon and civil law—in the administration and ministry of a parish or diocese (these activities could be inside or outside the community's territory). They have full authority in its administration.
However, there are significant limitations.
There are exigent circumstances, where due to Apostolical privilege, certain Abbesses have been granted rights and responsibilities above the normal, such as the Abbess of the Cistercian Monastery of the Abbey of Santa María la Real de Las Huelgas near Burgos, Spain. Also granted exceptional rights was the Abbess of the Cistercian order in Conversano Italy. She was granted the ability to appoint her own vicar-general, select and approve the confessors, along with the practice of receiving the public homage of her clergy. This practice continued until some of the duties were modified due to an appeal by the clergy to Rome. Finally in 1750, the public homage was abolished.
During the Middle Ages (7th–10th centuries) in the Catholic Church, greater restrictions on abbesses' spiritual independence gained pace. Instruments of church authority, from papal bulls down to local sanctions, were increasingly used to restrict their freedom to dispense blessings, administer sacraments, including the veiling of nuns, and publicly read the gospels or preach. Such spiritual—and even temporal—authority had in earlier church history, largely been unremarkable. As Thomas Oestereich, contributor to the "Catholic Encyclopedia" (1913), makes clear, abbesses' past spiritual authority was increasingly seen as the "usurpation" of corresponding priestly power, and a solely male privilege. He gives an example of the attitude toward such practice, from the 9th century, which persists in church administrative control into the modern era:
Similarly, in 1210, Innocent III (died 1216) expressed his view of the Cistercian Abbesses of Burgos and Palencia in Spain, who preached and heard confessions of their own religious, characterizing these acts as "unheard of, most indecorous, and highly preposterous."
History.
Historically, in some Celtic monasteries, abbesses presided over joint-houses of monks and nuns, the most famous example being Saint Brigid of Kildare's leadership in the founding of the monastery at Kildare in Ireland. This custom accompanied Celtic monastic missions to France, Spain, and even to Rome itself. In 1115, Robert, the founder of Fontevraud Abbey near Chinon and Saumur, France, committed the government of the whole order, men as well as women, to a female superior.
In Lutheran churches, the title of abbess () has in some cases survived (for example, in the Itzehoe Convent to designate the heads of abbeys which since the Protestant Reformation have continued as monasteries or convents (). These positions continued, merely changing from Catholic to Lutheran. The first to make this change was the Abbey of Quedlinburg, whose last Catholic Abbess died in 1514. These are collegiate foundations, which provide a home and an income for unmarried ladies, generally of noble birth, called canonesses (), or more usually, or . The office of abbess is of considerable social dignity, and in the past, was sometimes filled by princesses of the reigning houses. Until the dissolution of Holy Roman Empire and mediatisation of smaller imperial fiefs by Napoleon, the evangelical Abbess of Quedlinburg was also per officio the head of that state. The last such ruling abbess was Sofia Albertina, Princess of Sweden. The abess Hildegard of Fraunmünster Abbey sat in the Imperial Diet among other princes of the Holy Roman Empire. The oldest women's abbey in Germany is St. Marienthal Abbey of Cistercian nuns, near Ostritz, established during the early 13th century.
In the Hradčany of Prague is a Catholic institute whose mistress is titled an Abbess. It was founded in 1755 by the Empress Maria Theresa, and traditionally was responsible for the coronation of the Queen of Bohemia. The Abbess is required to be an Austrian Archduchess.
it was estimated the Catholic Church had around 200 presiding abbesses.
Abbas placename.
The word 'Abbas' is used as part of a place name (for example, the English villages of Compton Abbas and Milton Abbas). The name usually relates to land previously owned by an abbess.
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Abdominal surgery
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The term abdominal surgery broadly covers surgical procedures that involve opening the abdomen (laparotomy). Surgery of each abdominal organ is dealt with separately in connection with the description of that organ (see stomach, kidney, liver, etc.) Diseases affecting the abdominal cavity are dealt with generally under their own names.
Types.
The most common abdominal surgeries are described below.
Complications.
Complications of abdominal surgery include, but are not limited to:
Sterile technique, aseptic post-operative care, antibiotics, use of the WHO Surgical Safety Checklist, and vigilant post-operative monitoring greatly reduce the risk of these complications. Planned surgery performed under sterile conditions is much less risky than that performed under emergency or unsterile conditions. The contents of the bowel are unsterile, and thus leakage of bowel contents, as from trauma, substantially increases the risk of infection.
Globally, there are few studies comparing perioperative mortality following abdominal surgery across different health systems. One major prospective study of 10,745 adult patients undergoing emergency laparotomy from 357 centres in 58 high-, middle-, and low-income countries found that mortality is three times higher in low- compared with high-HDI countries even when adjusted for prognostic factors. In this study the overall global mortality rate was 1.6 percent at 24 hours (high 1.1 percent, middle 1.9 percent, low 3.4 percent), increasing to 5.4 percent by 30 days (high 4.5 percent, middle 6.0 percent, low 8.6 percent). Of the 578 patients who died, 404 (69.9 percent) did so between 24 hours and 30 days following surgery (high 74.2 percent, middle 68.8 percent, low 60.5 percent). Patient safety factors were suggested to play an important role, with use of the WHO Surgical Safety Checklist associated with reduced mortality at 30 days.
Taking a similar approach, a unique global study of 1,409 children undergoing emergency laparotomy from 253 centres in 43 countries showed that adjusted mortality in children following surgery may be as high as 7 times greater in low-HDI and middle-HDI countries compared with high-HDI countries, translating to 40 excess deaths per 1,000 procedures performed in these settings. Internationally, the most common operations performed were appendectomy, small bowel resection, pyloromyotomy and correction of intussusception. After adjustment for patient and hospital risk factors, child mortality at 30 days was significantly higher in low-HDI (adjusted OR 7.14 (95% CI 2.52 to 20.23)) and middle-HDI (4.42 (1.44 to 13.56)) countries compared with high-HDI countries.
Absorption of drugs administered orally was shown to be significantly affected following abdominal surgery.
There is low-certainty evidence that there is no difference between using scalpel and electrosurgery in infection rates during major abdominal surgeries.
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Abensberg
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Abensberg () is a town in the Lower Bavarian district of Kelheim, in Bavaria, Germany, lying around southwest of Regensburg, east of Ingolstadt, northwest of Landshut and north of Munich. It is situated on the river Abens, a tributary of the Danube.
Geography.
The town lies on the Abens river, a tributary of the Danube, around eight kilometres from the river's source. The area around Abensberg is characterized by the narrow valley of the Danube, where the Weltenburg Abbey stands, the valley of the Altmühl in the north, a left tributary of the Danube, and the famous Hallertau hops-planting region in the south. The town is divided into the municipalities of Abensberg, Arnhofen, Holzharlanden, Hörlbach, Offenstetten, Pullach and Sandharland.
Divisions.
Since the administrative reforms in Bavaria in the 1970s, the town also encompasses the following "Ortsteile":
History.
There had been settlement on this part of the Abens river since long before the High Middle Ages, dating back to Neolithic times. Of particular interest and national importance are the Neolithic flint mines at Arnhofen, where, around 7,000 years ago, Stone Age people made flint, which was fashioned into drills, blades and arrowheads, and was regarded as the steel of the Stone Age. Traces of over 20,000 individuals were found on this site. The modern history of Abensberg, which is often incorrectly compared with that of the third century Roman castra (military outpost) of Abusina, begins with Gebhard, who was the first to mention Abensberg as a town, in the middle of the 12th century. The earliest written reference to the town, under the name of "Habensperch", came from this time, in around 1138. Gebhard was from the Babonen clan.
In 1256, the castrum of "Abensprech" was first mentioned, and on 12 June 1348, Margrave Ludwig of Brandenburg, and his brother, Duke Stephen of Bavaria, raised Abensberg to the status of a city, giving it the right to operate lower courts, enclose itself with a wall and hold markets. The wall was built by Count Ulrich III of Abensberg. Some of the thirty-two round towers and eight turrets are still preserved to this day.
In the Middle Ages, the people of Abensberg enjoyed a level of autonomy above their lord. They elected a city council, although only a small number of rich families were eligible for election.
In around 1390, the Carmelite Monastery of Our Lady of Abensberg was founded by Count John II and his wife, Agnes. Although Abensberg was an autonomous city, it remained dependent on the powerful Dukes of Bavaria. The last Lord of Abensberg, Niclas, Graf von Abensberg, supposedly named after his godfather, Nicholas of Kues, a Catholic cardinal, was murdered in 1485 by Christopher, a Duke of Bavaria-Munich. The year before, Niclas had unchivalrously taken Christopher captive as he bathed before a tournament in Munich. Although Christopher renounced his claim for revenge, he lay in wait for Niclas in Freising. When the latter arrived, he was killed by Seitz von Frauenberg. He is buried in the former convent of Abensberg.
Abensberg then lost its independence and became a part of the Duchy of Bavaria, and from then on was administered by a ducal official, the so-called caretaker. The castle of Abensberg was destroyed during the Thirty Years' War, although the city had bought a guarantee of protection from the Swedish general, Carl Gustaf Wrangel. During the War of the Spanish Succession emperor Leopold I, who had occupied Bavaria, granted the fief of Abensberg to count Ernst von Abensperg und Traun (1608–1668) from an Austrian noble family named Traun that now received the name of the former counts of Abensberg (who were believed to be distant relatives). After the occupation ended, he was however dispossessed.
Johannes Aventinus (1477–1534) is the city's most famous son, the founder of the study of history in Bavaria. Aventinus, whose name was real name is Johann or Johannes Turmair ("Aventinus" being the Latin name of his birthplace) wrote the "Annals of Bavaria", a valuable record of the early history of Germany and the first major written work on the subject. He is commemorated in the Walhalla temple, a monument near Regensburg to the distinguished figures of German history. Until 1800, Abensberg was a municipality belonging to the Straubing district of the Electorate of Bavaria. Abensberg also contained a magistrates' court. In the Battle of Abensberg on 19–20 April 1809, Napoleon gained a significant victory over the Austrians under Archduke Ludwig of Austria and General Johann von Hiller.
Coat of arms.
The arms of the city are divided into two halves. On the left are the blue and white rhombuses of Bavaria, while the right half is split into two silver and black triangles. Two diagonally-crossed silver swords with golden handles rest on top.
The town has had a coat of arms since 1338, that of the Counts of Abensberg. With the death of the last Count, Nicholas of Abensberg, in 1485, the estates fell to the Duchy of Bavaria-Munich, meaning that henceforth only the Bavarian coat of arms was ever used.
On 31 December 1809, a decree of King Maximilian of Bavaria granted the city a new coat of arms, as a recognition of their (mainly humanitarian and logistic) services in the Battle of Abensberg the same year. The diagonally divided field in silver and black came from the old crest of the Counts of Abensberg, while the white and blue diamonds came from that of the House of Wittelsbach, the rulers of Bavaria. The swords recall the Battle of Abensberg.
The district of Offenstetten previously possessed its own coat of arms.
Economy and Infrastructure.
The area around Abensberg, the so-called sand belt between Siegburg, Neustadt an der Donau, Abensberg and Langquaid, is used for the intensive farming of asparagus, due to the optimal soil condition and climate. 212 hectares of land can produce ninety-four asparagus plants. Abensberg asparagus enjoys a reputation among connoisseurs as a particular delicacy. In addition to asparagus, the production of hops plays a major role locally, the region having its own label, and there are still three independent breweries in the area. The town of Abensberg marks the start of the "Deutsche Hopfenstraße" ("German Hops Road"), a nickname given to the Bundesstraße 301, a German federal highway which runs through the heartland of Germany's hops-growing industry, ending in Freising.
Transport.
The Abensberg railway station is located on the Regensburg–Ingolstadt railway from Regensburg to Ingolstadt. The city can be reached via the A-93 Holledau-Regensburg road (exit Abensberg). Three Bundesstraße (German federal highways) cross south of Abensberg: B 16, B 299 and B 301.
Public facilities.
Schools.
Abensberg has two Grundschulen (primary school) and Mittelschule (open admission secondary school), and the Johann-Turmair-Realschule (secondary modern school). There is also a College of Agriculture and Home Economics. Since 2007, the Kelheim Berufsschule has had a campus in Abensberg, and outside the state sector is the St. Francis Vocational Training Centre, run by a Catholic youth organisation. In addition, there are two special schools, one near Abensberg, the other in the civil parish of Offenstetten.
Culture and sightseeing.
Theatre.
In 2008, a former goods shed by the main railway station of Abensberg was converted into a theatre by local volunteers. The "Theater am Bahnhof" ("Theatre at the Railway Station") is mostly used by the "Theatergruppe Lampenfieber" and was opened on 19 October 2008.
Museums.
Abensberg has a long tradition of museums. In the nineteenth century, Nicholas Stark und Peter Paul Dollinger began a collection based on local history. This collection and the collection of the "Heimatverein" (local history society) were united in 1963 into the Aventinus Museum, in the cloister of the former Carmelite monastery. On 7 July 2006, the new Town Museum of Abensberg was opened in the former duke's castle in the town.
Kuchlbauer Brewery.
Two blocks west of the Old Town is the Kuchlbauer Brewery and beer garden featuring the Kuchlbauer Tower, a colorful and unconventional observation tower designed by Viennese architect Friedensreich Hundertwasser. The brewery and tower are open to the public.
Missing memorial.
Up until the 1950s, Abensberg and the surrounding villages contained a number of graves of victims of a Death March in the spring of 1945 from the Hersbruck sub-camp of the Dachau concentration camp, who were either murdered by the SS or died of exhaustion. They were originally buried where they died, but were later moved on the orders of the US military government to the cemeteries of their previous homes. At the cemetery in what is now the district of Pullach stood a memorial stone which was mentioned as recently as 1967, but which is no longer at the site. The suffering of ten unknown victims of the camp was recorded on the stone.
Sport.
Speedway and football.
The Wack Hofmeister Stadium, formerly the Altes Stadion Abensberg (the Old Stadium) is a motorcycle speedway and association football stadium located slightly east of the centre of Abensberg in Germany. It hosts the speedway team MSC Abensberg and the football team TSV Abensberg 1862.
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Arminianism
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Arminianism is a movement of Protestantism initiated in the early 17th century, based on the theological ideas of the Dutch Reformed theologian Jacobus Arminius and his historic supporters known as Remonstrants. Dutch Arminianism was originally articulated in the "Remonstrance" (1610), a theological statement submitted to the States General of the Netherlands. This expressed an attempt to moderate the doctrines of Calvinism related to its interpretation of predestination.
Classical Arminianism, to which Arminius is the main contributor, and Wesleyan Arminianism, to which John Wesley is the main contributor, are the two main schools of thought. Central Arminian beliefs are that God's prevenient grace, which prepares regeneration, is universal and that his grace, allowing regeneration and ongoing sanctification, is resistible.
Many Christian denominations have been influenced by Arminian views, notably the Baptists in the 17th century, the Methodists in the 18th century, and the Pentecostals in the 20th century.
History.
Precursor movements and theological influences.
Arminius' beliefs, i.e. Arminianism, did not begin with him. Before the Reformation, groups like the Waldensians similarly affirmed individual freedom over any predetermined predestination. Anabaptist theologian Balthasar Hubmaier (1480–1528) also promoted much the same view as Arminius nearly a century before him. The soteriological doctrines of Arminianism and Anabaptism are roughly equivalent. In particular, Mennonites have been historically Arminian whether they distinctly espoused the Arminian viewpoint or not, and rejected Calvinist soteriology. Anabaptist theology seems to have influenced Jacobus Arminius. At least, he was "sympathetic to the Anabaptist point of view, and Anabaptists were commonly in attendance on his preaching." Similarly, Arminius mentions Danish Lutheran theologian Niels Hemmingsen (1513–1600) as holding the basic view of soteriology he held and he may have been influenced by Hemmingsen. Another key figure, Sebastian Castellio (1515–1563), who opposed Calvin's views on predestination and religious intolerance, is known to have influenced both the Mennonites and certain theologians within Arminius's circle. Early critics of Arminians even cited Castellio as a primary inspiration behind the Arminian movement.
Emergence of Arminianism.
Jacobus Arminius (1560–1609) was a Dutch pastor and theologian. He was taught by Theodore Beza, Calvin's hand-picked successor, but after examination of the scriptures, he rejected his teacher's theology that it is God who unconditionally elects some for salvation. Instead Arminius proposed that the election of God was "of believers", thereby making it conditional on faith. Arminius's views were challenged by the Dutch Calvinists, especially Franciscus Gomarus.
In his "Declaration of Sentiments" (1608) Arminius presented his theology to magistrates of the States General of the Netherlands in The Hague. After his death, Arminius's followers continued to advance his theological vision, crafting the "Five articles of Remonstrance" (1610), in which they express their points of divergence from the stricter Calvinism of the "Belgic Confession". This is how Arminius's followers were called Remonstrants, and following a "Counter Remonstrance" in 1611, Gomarus' followers were called Counter-Remonstrants.
After some political maneuvering, the Dutch Calvinists were able to convince Prince Maurice of Nassau to deal with the situation. Maurice systematically removed Arminian magistrates from office and called a national synod at Dordrecht. This Synod of Dort was open primarily to Dutch Calvinists (102 people), while the Arminians were excluded (13 people banned from voting), with Calvinist representatives from other countries (28 people), and in 1618 published a condemnation of Arminius and his followers as heretics. The Canons of Dort responded, among other topics, to Arminian doctrines, anticipating their later articulation as the Five points of Calvinism.
Arminians across Holland were removed from office, imprisoned, banished, and sworn to silence. Twelve years later, Holland officially granted Arminianism protection as a religion, although animosity between Arminians and Calvinists continued. Most of the early Remonstrants followed a classical version of Arminianism. However, some of them such as Philipp van Limborch, moved in the direction of semi-Pelagianism and rationalism.
Arminianism in the Church of England.
In England, the so-labelled Arminian doctrines were held, in substance, before and in parallel with those of Arminius. The Thirty-nine Articles of Religion (finalised in 1571), were sufficiently ambiguous that they were compatible with either Arminian or Calvinistic interpretations. Arminianism in the Church of England was fundamentally an expression of negation of Calvinism, and only some theologians held to classical Arminianism, but for the rest they were either semi-Pelagian or Pelagian. In this specific context, contemporary historians prefer to use the term "proto-Arminians" rather than "Arminians" to designate the leanings of those divines who generally didn't follow classical Arminianism. English Arminianism was represented by Arminian Puritans such as John Goodwin or High Anglican Arminians such as Jeremy Taylor and Henry Hammond. Anglican Arminians of the 17th century such as William Laud fought Calvinist Puritans. They actually saw Arminianism in terms of a state church, an idea that was alien to the views of Arminius. This position became particularly evident under the reign (1625–1649) of Charles I of England. Following the English Civil War (1642–1651) Charles II of England, who tolerated the Presbyterians, re-instituted Arminian thought in the Church of England. It was dominant there after the Restoration (1660) for some fifty years.
Baptists.
The Baptist tradition emerged from English Puritanism in the 17th-century England. The first Baptists — later called "General Baptists" because of their confession of general atonement — were Puritans who shared similarities with Arminianism. The Baptist tradition originated with Puritan leaders such as Thomas Helwys, who expelled John Smyth from the Puritan group exiled in Continental Europe and returned their congregation to England, in the City of London, in 1612. Later General Baptists ministers such as John Griffith, Henry Denne, Samuel Loveday, and Thomas Grantham represented and defended a Classical Arminian soteriology that reflected the teachings of Jacobus Arminius. These Baptists encapsulated their Arminian views in two confessions of faith: the Standard Confession (original edition 1660). In the 1630s, the Particular Baptists emerged, diverging from Arminian doctrine and embracing the strong Calvinism of the Presbyterians and Congregationalists. Their robust Calvinism was publicized in the First London Confession of Faith, in 1644, and the Second London Confession of Faith, in 1689. The First London Confession of 1689 was later modified by Calvinist Baptists in America and resulted in the Philadelphia Confession of Faith, published in 1742, whereas the Standard Confession of 1660 was used by Arminian Baptists in America, who later came to be known as Free Will Baptists.
Methodists.
In the Methodist-Calvinist controversy of the early 1770s involving Anglican ministers John Wesley and George Whitefield, Wesley responded to accusations of semi-Pelagianism by embracing an Arminian identity. Wesley had limited familiarity with the beliefs of Arminius and largely formulated his views without direct reliance on Arminius' teachings. Wesley was notably influenced by 17th-century English Arminianism and by some Remonstrant spokesmen. However, he is recognized as a faithful representative of Arminius' beliefs. Wesley defended his soteriology through the publication of a periodical titled "The Arminian" (1778) and in articles such as "Predestination Calmly Considered". To support his stance, he strongly maintained belief in total depravity while clarifying other doctrines notably prevenient grace. At the same time, Wesley attacked the determinism that he claimed characterized Calvinist doctrines of predestination. He typically preached the notion of Christian perfection (fully mature, not "sinlessness"). His system of thought has become known as Wesleyan Arminianism, the foundations of which were laid by him and his fellow preacher John William Fletcher. Methodism also navigated its own theological intricacies concerning salvation and human agency. In the 1830s, during the Second Great Awakening, traces of Pelagian influence surfaced in the American Holiness Movement. Consequently, critics of Wesleyan theology have occasionally unfairly perceived or labeled its broader thought. However, its core is recognized to be Arminianism.
Pentecostals.
Pentecostalism has its background in the activity of Charles Parham (1873–1929). Its origin as a movement was in the Azusa Street Revival in Los Angeles in 1906. This revival was led by William J. Seymour (1870–1922). Due to the Methodist and Holiness background of many early Pentecostal preachers, the Pentecostal churches usually possessed practices that arose from the Wesleyan Arminianism. During the 20th century, as Pentecostal churches began to settle and incorporate more standard forms, they started to formulate theology that was fully Arminian. Today, Pentecostal denominations such as the Assemblies of God hold to Arminian views such as resistible grace, conditional election, and conditional security of the believer.
Current landscape.
Protestant denominations.
Advocates of Arminianism find a home in many Protestant denominations, and sometimes other beliefs such as Calvinism exist within the same denomination. The Lutheran theological tradition bears certain similarities to Arminianism and there may be some Lutheran churches that are open to it. Newer Evangelical Anglican denominations also show a level of openness to Arminian theology. Anabaptist denominations, such as the Mennonites, Hutterites, Amish and Schwarzenau Brethren, adhere to Anabaptist theology, which espouses a soteriology that is similar to Arminianism "in some respects". Arminianism is found within the Baptists, more specifically in the General Baptist strand - including the subset of General Baptists known as Free Will Baptists. The majority of Southern Baptist Convention embrace a traditionalist form of Arminianism which includes a belief in eternal security, though many see Calvinism as growing in acceptance. Certain proponents of Arminianism may be found within the Restoration movement in the Christian Churches and Churches of Christ. Additionally, it is found in the Seventh-day Adventist Church. Arminianism (specifically Wesleyan–Arminian theology) is taught in the Methodist churches, inclusive of those denominations aligned with the holiness movement such as the Evangelical Methodist Church, Church of the Nazarene, the Free Methodist Church, the Wesleyan Church, and the Salvation Army. It is also found in a part of the Charismatics, including the Pentecostals.
Scholarly support.
Arminian theology has found support among theologians, Bible scholars, and apologists spanning various historical periods and theological circles. Noteworthy historical figures include Jacobus Arminius, Simon Episcopius, Hugo Grotius, John Goodwin, Thomas Grantham, John Wesley, Richard Watson, Thomas Osmond Summers, John Miley, William Burt Pope and Henry Orton Wiley.
In contemporary Baptist traditions, advocates of Arminian theology include Roger E. Olson, F. Leroy Forlines, Robert Picirilli and J. Matthew Pinson. Within the Methodist tradition, prominent supporters encompass Thomas Oden, Ben Witherington III, David Pawson, B. J. Oropeza, Thomas H. McCall and Fred Sanders. The Holiness movement boasts theologians like Carl O. Bangs and J. Kenneth Grider. Furthermore, scholars such as Keith D. Stanglin, Craig S. Keener and Grant R. Osborne also support Arminian perspectives.
Theology.
Theological legacy.
The Pelagian-Augustinian framework can serve as a key paradigm for understanding Arminianism's theological and historical legacy. Before Augustine (354–430), the synergistic view of salvation was almost universally endorsed. Pelagius (c. 354–418), however, argued that humans could perfectly obey God by their own will. The Pelagian view is therefore referred to as "humanistic monergism". This view was condemned at the Council of Carthage (418) and Ephesus (431). In response, Augustine proposed a view in which God is the ultimate cause of all human actions, a stance that aligns with soft determinism. The Augustinian view is therefore referred to as "divine monergism". However, Augustinian soteriology implied double predestination, which was condemned by the Council of Arles (475).
During this period, a moderate form of Pelagianism emerged, later termed Semi-Pelagianism. This view asserted that human will initiates salvation, rather than divine grace. The Semi-Pelagian view is therefore described as "human-initiated synergism". In 529, the Second Council of Orange addressed Semi-Pelagianism and declared that even the inception of faith is a result of God's grace. This highlights the role of prevenient grace enabling human belief. This view, often referred to as "Semi-Augustinian," is therefore described as "God-initiated synergism". The council also rejected predestination to evil. As Arminianism aligns with key aspects of this view, some see it as a return to early Church theological consensus. Moreover, Arminianism can also be seen as a soteriological diversification of Calvinism or, more specifically, as a theological middle ground between Calvinism and semi-Pelagianism.
Arminian theology generally divides into two main variations: Classical Arminianism, based on the teachings of Jacobus Arminius, and Wesleyan Arminianism, a closely related variation shaped primarily by John Wesley.
Classical Arminianism.
Definition and terminology.
Classical Arminianism is a Protestant theological view, that asserts God's prevenient grace for regeneration is universal and that the grace allowing regeneration and ongoing sanctification is resistible. This theological system was presented by Jacobus Arminius and maintained by some of the Remonstrants, such as Simon Episcopius and Hugo Grotius.
Arminian theology incorporates the language and framework of covenant theology. Its core teachings are summarized in the "Five Articles of Remonstrance", reflecting Arminius's views, with some sections directly from his "Declaration of Sentiments". Some theologians have referred to this system as "classical Arminianism". Others prefer "Reformation Arminianism" or "Reformed Arminianism", as Arminius upheld the principles of Reformation such as "Sola fide" and "Sola gratia".
God's providence and human free will.
Arminianism accepts classical theism, which states that God is omnipresent, omnipotent, and omniscient. In that view, God's power, knowledge, and presence have no external limitations, that is, outside of his divine nature and character.
Besides, Arminianism's view of God's sovereignty is based on postulates stemming from God's character. On the first hand, divine election must be defined so that God is not, in any case, and even in a secondary way, the author of evil. It would not correspond to the character of God, especially as fully revealed in Jesus Christ. On the other hand, man's responsibility for evil must be preserved. Those two postulates require a specific way by which God chooses to manifest his sovereignty when interacting with his creatures.
On one hand, it requires God to operate according to a limited mode of providence. This means that God deliberately exercises sovereignty without determining every event. On the other hand, it requires God's election to be a "predestination by foreknowledge". Therefore, God's foreknowledge is exhaustive and complete, aligning his certainty with human freedom of action.
Philosophical view on free will.
Arminianism is aligned with classical free-will theism, adopting an incompatibilist position. It asserts that the free will essential for moral responsibility is inherently incompatible with determinism. In Arminian theology, human beings possess libertarian free will, making them the ultimate source of their choices and granting them the ability to choose otherwise. This philosophical framework upholds the concept of divine providence, allowing God's influence and supervision over creation. However, it permits the idea of God's absolute control over human actions, as long as such control does not involve human responsibility.
Spiritual view on free will.
Arminianism holds that all humans are initially deprived of the Holy Spirit and, as a result, exist in a moral state of total depravity. In this condition, human free will is incapable of choosing spiritual good without the aid of divine grace. Arminius likely believed that every person is born in this depraved condition because Adam, as humanity's representative, sinned against God—a view later shared by several prominent Arminians. Like Augustine, Luther, and Calvin, Arminius agreed that human free will is spiritually "captive" and "enslaved". However, through the action of prevenient grace, human free will can be "freed", meaning it can be restored with the ability to choose the spiritual good, particularly the capacity to accept God's call to salvation.
Extent and nature of the atonement.
Atonement is intended universally: Jesus's death was for all people; Jesus draws all people to himself, with the opportunity for salvation through faith.
Jesus's death satisfies God's justice: The penalty for the sins of the elect is paid in full through the crucifixion of Jesus. Thus, Jesus's death atones for all sins but requires faith to be effected. Arminius states that "Justification, when used for the act of a Judge, is either purely the imputation of righteousness through mercy [...] or that man is justified before God [...] according to the rigor of justice without any forgiveness." Justification, therefore, is seen through mercy by the imputation of righteousness. While not rigidly defined, this view suggests that the righteousness of Christ is attributed to believers, emphasizing that union with Christ (conditioned on faith) transfers his righteousness to them.
Christ's atonement has a substitutionary effect, which is limited only to the elect. Arminius held that God's justice was satisfied by penal substitution. Hugo Grotius taught that it was satisfied governmentally. Historical and contemporary Arminians have held one of these views.
Conversion of man.
In Arminianism, God initiates the process of salvation by extending his grace, commonly referred to as "prevenient" grace, to all people. This grace works within each individual, drawing them toward the Gospel and enabling sincere faith, leading to regeneration. It functions through a dynamic influence-and-response relationship, allowing individuals to accept or reject it freely. Thus, conversion is described as a "God-initiated synergism."
Election of man.
Election is conditional: Arminius defined "election" as "the decree of God by which, of Himself, from eternity, He decreed to justify in Christ, believers, and to accept them unto eternal life." God alone determines who will be saved, and he decides that all who believe Jesus through faith will be justified. Arminius states, "God regards no one in Christ unless they are engrafted in him by faith."
God predestines the elect to a glorious future: Predestination is not the predetermination of who will believe but rather the predetermination of the believer's future inheritance. The elect are therefore predestined to sonship through adoption, glorification, and eternal life.
Preservation of man.
Related to eschatological considerations, Jacobus Arminius and the first Remonstrants, including Simon Episcopius believed in everlasting fire where the wicked are thrown by God at judgment day.
Preservation is conditional: All believers have full assurance of salvation with the condition that they remain in Christ. Salvation is conditioned on faith; therefore, perseverance is also conditioned. Arminius believed the Scriptures taught that believers are graciously empowered by Christ and the Holy Spirit "to fight against Satan, sin, the world and their own flesh, and to gain the victory over these enemies." Furthermore, Christ and the Spirit are ever present to aid and assist believers through various temptations. But this security was not unconditional but conditional—"provided they [believers] stand prepared for the battle, implore his help, and be not wanting to themselves, Christ preserves them from falling."
Possibility of apostasy.
Arminius believed in the possibility of apostasy. However, over the period of time he wrote on this question, he sometimes expressed himself more cautiously out of consideration for the faith of his readers. In 1599, he stated that the question required more scriptural examination. In his "Declaration of Sentiments" (1607), Arminius said, "I never taught that a true believer can, either totally or finally fall away from the faith, and perish; yet I will not conceal, that there are passages of scripture which seem to me to wear this aspect."
However, Arminius elsewhere expressed certainty about the possibility of falling away: In c. 1602, he noted that a person integrated into the church might resist God's work and that a believer's security rested solely on their choice not to abandon their faith. He argued that God's covenant did not eliminate the possibility of falling away but provided a gift of fear to keep individuals from defecting as long as it thrived in their hearts. He then taught that had David died in sin, he would have been lost. In 1602, Arminius also wrote: "A believing member of Christ may become slothful, give place to sin, and gradually die altogether, ceasing to be a member".
For Arminius, a certain class of sin would cause a believer to fall, especially sin motivated by malice. In 1605, Arminius wrote: “But it is possible for a believer to fall into a mortal sin, as is seen in David. Therefore, he can fall at that moment in which if he were to die, he would be condemned". Scholars observe that Arminius clearly identifies two paths to apostasy 1. "rejection", or 2. "malicious sinning". He suggested that strictly speaking, believers could not directly lose their faith but could cease to believe and thus fall away.
After the death of Arminius in 1609, his followers wrote a "Remonstrance" (1610) based quite literally on his "Declaration of Sentiments" (1607), which expressed prudence on the possibility of apostasy. In particular, its fifth article expressed the necessity of further study on the possibility of apostasy. Sometime between 1610 and the official proceeding of the Synod of Dort (1618), the Remonstrants became fully persuaded in their minds that the Scriptures taught that a true believer was capable of falling away from faith and perishing eternally as an unbeliever. They formalized their views in "The Opinion of the Remonstrants" (1618), which was their official stand during the Synod of Dort. They later expressed this same view in the "Remonstrant Confession" (1621).
Forgivability of apostasy.
Arminius maintained that if the apostasy came from "malicious" sin, it was forgivable. If it came from "rejection," it was not. Following Arminius, the Remonstrants believed that, though possible, apostasy was not in general irremediable. However, other classical Arminians, including the Free Will Baptists, have taught that apostasy is irremediable.
Wesleyan Arminianism.
Distinctive aspect.
John Wesley thoroughly agreed with the vast majority of what Arminius himself taught. Wesleyan Arminianism is a merger of classical Arminianism and Wesleyan perfectionism.
Nature of the atonement.
Wesley's view of atonement is either understood as a hybrid of penal substitution and the governmental theory, or it is viewed solely as penal substitution. Historically, Wesleyan Arminians adopted either the penal or governmental theory of atonement.
Justification and sanctification.
In Wesleyan theology, justification is understood as the forgiveness of sins rather than being made inherently righteous. Righteousness is achieved through sanctification, which involves the pursuit of holiness in one's life. Wesley taught that imputed righteousness, which refers to the righteousness credited to a believer through faith, must transform into imparted righteousness, where this righteousness becomes evident in the believer's life.
Christian perfection.
Wesley taught that through the Holy Spirit, Christians could achieve a state of practical perfection, or "entire sanctification", characterized by a lack of voluntary sin. This state involves embodying the love of God and neighbor. It does not mean freedom from all mistakes or temptations, as perfected Christians still need to seek forgiveness and strive for holiness. Ultimately, perfection in this context is about love, not absolute perfection.
Preservation and apostasy of man.
Wesley believed genuine Christians could apostatize. He emphasized that sin alone does not lead to this loss; instead, prolonged unconfessed sin and deliberate apostasy can result in a permanent fall from grace. However, he believed that such apostasy was not irremediable.
Corporate election variation.
The majority Arminian view is that election is individual and based on God's foreknowledge of faith. In the corporate election view, God chose the believing church collectively for salvation rather than selecting individuals. Jesus is seen as the only person elected, and individuals join the elect through faith "in Christ". This view is supported by Old Testament and Jewish concepts, where identity is rooted more in group membership than individuality.
Arminianism and other views.
Divergence with Pelagianism.
Pelagianism is a doctrine denying original sin and total depravity. No system of Arminianism founded on Arminius or Wesley denies original sin or total depravity; both Arminius and Wesley "strongly" affirmed that man's basic condition is one in which he cannot be righteous, understand God, or seek God. Arminius referred to Pelagianism as "the grand falsehood" and stated that he "must confess that I detest, from my heart, the consequences [of that theology]." This association is considered as libelous when attributed to Arminius' or Wesley's doctrine, and Arminians reject all accusations of Pelagianism.
Divergence with Semi-Pelagianism.
Semi-Pelagianism holds that faith begins with human will, while its continuation and fulfillment depend on God's grace, giving it the label "human-initiated synergism". In contrast, both Classical and Wesleyan Arminianism affirm that prevenient grace from God initiates the process of salvation, a view sometimes referred to as "Semi-Augustinian", or "God-initiated synergism". Following the Reformation, Reformed theologians often categorized both "human-initiated synergism" and "God-initiated synergism" as "Semi-Pelagianism", often leading to mistaken belief that Arminianism aligned with Semi-Pelagianism.
Divergence with Calvinism.
Calvinism and Arminianism, while sharing historical roots and many theological doctrines, diverge notably on the concepts of divine predestination and election. While some perceive these differences as fundamental, others regard them as relatively minor distinctions within the broader spectrum of Christian theology.
Divergence with open theism.
The doctrine of open theism states that God is omnipresent, omnipotent, and omniscient, but differs on the nature of the future. Open theists claim that the future is not completely determined (or "settled") because people have not made their free decisions yet. God therefore knows the future partially in possibilities (human free actions) rather than solely certainties (divinely determined events). Some Arminians, reject open theism, viewing it as a distortion of traditional Arminianism. They believe it shifts away from classical Arminianism toward process theology. Others view it as a valid alternative perspective within Christianity, despite not aligning it with Arminian doctrine.
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The Alan Parsons Project
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The Alan Parsons Project was a British rock duo formed in London in 1975. Its core membership consisted of producer, audio engineer, musician and composer Alan Parsons, and singer, songwriter and pianist Eric Woolfson. They shared writing credits on almost all of their songs, with Parsons producing or co-producing all of the recordings, while being accompanied by various session musicians, some relatively consistently.
The Alan Parsons Project released eleven studio albums over a 15-year career, the most successful ones being "I Robot" (1977), "The Turn of a Friendly Card" (1980) and "Eye in the Sky" (1982). Many of their albums are conceptual in nature and focus on science fiction, supernatural, literary and sociological themes. Among the group's most popular songs are "I Wouldn't Want to Be Like You", "Games People Play", "Time", "Sirius", "Eye in the Sky", and "Don't Answer Me".
Career.
1974–1976: Formation and debut.
Alan Parsons met Eric Woolfson in the canteen of Abbey Road Studios in the summer of 1974. Parsons was assistant engineer on the Beatles' albums "Abbey Road" (1969) and "Let It Be" (1970), engineered Pink Floyd's "The Dark Side of the Moon" (1973), and produced several acts for EMI Records. Woolfson, a songwriter and composer, was working as a session pianist while composing material for a concept album based on the work of Edgar Allan Poe.
Woolfson's idea was to manage Alan and help his already successful production career. It was the start of a longstanding friendly business relationship. He managed Parsons's career as a producer and engineer through a string of successes, including Pilot, Steve Harley, Cockney Rebel, John Miles, Al Stewart, Ambrosia, and the Hollies. Woolfson came up with the idea of making an album based on developments in the film industry—the focal point of the films' promotion shifted from film stars to directors such as Alfred Hitchcock and Stanley Kubrick. If the film industry was becoming a director's medium, Woolfson felt the music business might well become a producer's medium.
Recalling his earlier Edgar Allan Poe material, Woolfson saw a way to combine his and Parsons's talents. Parsons produced and engineered songs written and composed by the two, and the first Alan Parsons Project was begun. The Project's first album, "Tales of Mystery and Imagination" (1976), released by 20th Century Fox Records and including major contributions by all members of Pilot and Ambrosia, was a success, reaching the Top 40 in the US "Billboard" 200 chart. The song "The Raven" featured lead vocals by the actor Leonard Whiting. According to the 2007 re-mastered album liner notes, this was the first rock song to use a vocoder, with Alan Parsons speaking lyrics through it, although others such as Bruce Haack pioneered this field in the previous decade.
1977–1990: Mainstream success and final releases.
Arista Records then signed the Alan Parsons Project for further albums. Through the late 1970s and early 1980s, the Project's popularity continued to grow. The Project was always more popular in North America, Ibero-America, and Continental Europe than in Parsons' home country, never achieving a UK Top 40 single or Top 20 album. The singles "I Wouldn't Want to Be Like You", "Games People Play", "Damned If I Do", "Time" (the first single to feature Woolfson's lead vocal) and "Eye in the Sky" had a notable impact on the "Billboard" Hot 100. "Don't Answer Me" became the Project's last successful single in the United States; it reached the top 15 on the American charts in 1984.
After those successes, the Project began to fade from view. There were fewer hit singles, and declining album sales. 1987's "Gaudi" was the Project's final release, though it had planned to record an album called "Freudiana" (1990) next.
The musical "Freudiana".
Even though the studio version of "Freudiana" was produced by Parsons (and featured the regular Project session musicians, making it an 'unofficial' Project album), it was primarily Woolfson's idea to turn it into a musical. While Parsons pursued his own solo career and took many session players of the Project on the road for the first time in a successful worldwide tour, Woolfson went on to produce musical plays influenced by the Project's music. "Freudiana", "Gaudi", and "Gambler" were three musicals that included some Project songs like "Eye in the Sky", "Time", "Inside Looking Out", and "Limelight". The live music from "Gambler" was only distributed at the performance site in Mönchengladbach, Germany.
"The Sicilian Defence".
In 1979, Parsons, Woolfson, and their record label Arista, had been stalled in contract renegotiations when the two submitted an all-instrumental album tentatively titled "The Sicilian Defence", named after an aggressive opening move in chess. Arista's refusal to release the album had two known effects: the negotiations led to a renewed contract, and the album was not released at that time.
In interviews he gave before his death in 2009, Woolfson said he planned to release one track from the "Sicilian" album, which in 2008 appeared as a bonus track on a CD re-issue of the "Eve" album. Sometime later, after he had relocated the original tapes, Parsons reluctantly agreed to release the album and announced that it would finally be released on an upcoming Project box set called "The Complete Albums Collection" in 2014 for the first time as a bonus disc.
Parsons's and Woolfson's solo careers.
Parsons released titles under his name: "Try Anything Once" (1993), "On Air" (1996), "The Time Machine" (1999), "A Valid Path" (2004), "The Secret" (2019) and "From the New World" (2022). Meanwhile, Woolfson made concept albums titled "Freudiana" (1990), about Sigmund Freud's work on psychology, and "" (2003), continuing from the Alan Parsons Project's first album about Poe literature.
"Tales of Mystery and Imagination" (1976) was re-mixed in 1987 for release on CD, and included narration by Orson Welles recorded in 1975, but delivered too late to be included on the original album. For the 2007 deluxe edition release, parts of this tape were used for the 1976 Griffith Park Planetarium launch of the original album, the 1987 remix, and various radio spots. All were included as bonus material.
Sound.
The band's sound is described as progressive rock, art rock, progressive pop, and soft rock. "Sirius" is their best-known and most-frequently heard of all Parsons/Woolfson songs. It was used as entrance music by various American sports teams, notably by the Chicago Bulls during their 1990s NBA dynasty. It was also used as the entrance theme for Ricky Steamboat in pro wrestling of the mid-1980s. In addition, "Sirius" is played in a variety of TV shows and movies including the BBC series Record Breakers, the episode "Vanishing Act" of "" and the 2009 film "Cloudy with a Chance of Meatballs".
Vocal duties were shared by guests to complement each song. In later years, Woolfson sang lead on many of the group's hits, including "Time", "Eye in the Sky", and "Don't Answer Me". The record company pressured Parsons to use Woolfson more, but Parsons preferred to use polished proficient singers; Woolfson admitted he was not in that category. In addition to Woolfson, vocalists Chris Rainbow, Lenny Zakatek, John Miles, David Paton, and Colin Blunstone are regulars. Other singers, such as Arthur Brown, Steve Harley, Gary Brooker, Dave Terry a.k.a. Elmer Gantry, Vitamin Z's Geoff Barradale, and Marmalade's Dean Ford, recorded only once or twice with the Project. Parsons sang lead on one song ("The Raven") through a vocoder and backing on a few others, including "To One in Paradise". Both of those songs appeared on "Tales of Mystery and Imagination" (1976). Parsons also sings a prominent counter melody on "Time".
A variety of session musicians worked with the Alan Parsons Project regularly, contributing to the recognizable style of a song despite the varied singer line-up. With Parsons and Woolfson, the studio band consisted of the group Pilot, with Ian Bairnson (guitar), David Paton (bass) and Stuart Tosh (drums). Pilot's keyboardist Billy Lyall contributed. From "Pyramid" (1978) onward, Tosh was replaced by Stuart Elliott of Cockney Rebel. Bairnson played on all albums, and Paton stayed almost until the end. Andrew Powell appeared as arranger of orchestra (and often choirs) on all albums except "Vulture Culture" (1985); he was composing the score of Richard Donner's film "Ladyhawke" (1985). This score was partly in the APP style, recorded by most of the APP regulars, and produced and engineered by Parsons. Powell composed some material for the first two Project albums. For "Vulture Culture" and later, Richard Cottle played as a regular contributor on synthesizers and saxophone.
The Alan Parsons Project played live only once under that name during its original incarnation because Woolfson and Parsons held the roles of writing and production, and because of the technical difficulties of re-producing on stage the complex instrumentation used in the studio. In the 1990s, musical production evolved with the technology of digital samplers. The one occasion the band was introduced as 'the Alan Parsons Project' in a live performance was at The Night of the Proms, in Brussels, in October 1990. The concerts featured all Project regulars except Woolfson, present behind the scenes, while Parsons stayed at the mixer except for the last song, when he played acoustic guitar.
Since 1993, Alan Parsons continues to perform live as the Alan Parsons Live Project to be distinct from the Alan Parsons Project. The current line up consists of lead singer P.J. Olsson, guitarist Jeffrey Kollman, drummer Danny Thompson, keyboardist Tom Brooks, bass guitarist Guy Erez, vocalist and saxophonist Todd Cooper, and guitarist and vocalist Dan Tracey. In 2013, Alan Parsons Live Project played in Colombia with a full choir and orchestra (the Medellin Philharmonic) as 'Alan Parsons Symphonic Project'. A 2-CD live set and a DVD version of this concert were released in May 2016.
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Almost all
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In mathematics, the term "almost all" means "all but a negligible quantity". More precisely, if formula_1 is a set, "almost all elements of formula_1" means "all elements of formula_1 but those in a negligible subset of formula_1". The meaning of "negligible" depends on the mathematical context; for instance, it can mean finite, countable, or null.
In contrast, "almost no" means "a negligible quantity"; that is, "almost no elements of formula_1" means "a negligible quantity of elements of formula_1".
Meanings in different areas of mathematics.
Prevalent meaning.
Throughout mathematics, "almost all" is sometimes used to mean "all (elements of an infinite set) except for finitely many". This use occurs in philosophy as well. Similarly, "almost all" can mean "all (elements of an uncountable set) except for countably many".
Examples:
Meaning in measure theory.
When speaking about the reals, sometimes "almost all" can mean "all reals except for a null set". Similarly, if S is some set of reals, "almost all numbers in S" can mean "all numbers in S except for those in a null set". The real line can be thought of as a one-dimensional Euclidean space. In the more general case of an n-dimensional space (where n is a positive integer), these definitions can be generalised to "all points except for those in a null set" or "all points in S except for those in a null set" (this time, S is a set of points in the space). Even more generally, "almost all" is sometimes used in the sense of "almost everywhere" in measure theory, or in the closely related sense of "almost surely" in probability theory.
Examples:
Meaning in number theory.
In number theory, "almost all positive integers" can mean "the positive integers in a set whose natural density is 1". That is, if A is a set of positive integers, and if the proportion of positive integers in "A" below n (out of all positive integers below n) tends to 1 as n tends to infinity, then almost all positive integers are in A.
More generally, let S be an infinite set of positive integers, such as the set of even positive numbers or the set of primes, if A is a subset of S, and if the proportion of elements of S below n that are in A (out of all elements of S below n) tends to 1 as n tends to infinity, then it can be said that almost all elements of S are in A.
Examples:
Meaning in graph theory.
In graph theory, if A is a set of (finite labelled) graphs, it can be said to contain almost all graphs, if the proportion of graphs with n vertices that are in A tends to 1 as n tends to infinity. However, it is sometimes easier to work with probabilities, so the definition is reformulated as follows. The proportion of graphs with n vertices that are in A equals the probability that a random graph with n vertices (chosen with the uniform distribution) is in A, and choosing a graph in this way has the same outcome as generating a graph by flipping a coin for each pair of vertices to decide whether to connect them. Therefore, equivalently to the preceding definition, the set "A" contains almost all graphs if the probability that a coin-flip–generated graph with n vertices is in A tends to 1 as n tends to infinity. Sometimes, the latter definition is modified so that the graph is chosen randomly in some other way, where not all graphs with n vertices have the same probability, and those modified definitions are not always equivalent to the main one.
The use of the term "almost all" in graph theory is not standard; the term "asymptotically almost surely" is more commonly used for this concept.
Example:
Meaning in topology.
In topology and especially dynamical systems theory (including applications in economics), "almost all" of a topological space's points can mean "all of the space's points except for those in a meagre set". Some use a more limited definition, where a subset contains almost all of the space's points only if it contains some open dense set.
Example:
Meaning in algebra.
In abstract algebra and mathematical logic, if U is an on a set X, "almost all elements of X" sometimes means "the elements of some "element" of U". For any partition of X into two disjoint sets, one of them will necessarily contain almost all elements of X. It is possible to think of the elements of a filter on X as containing almost all elements of X, even if it isn't an ultrafilter.
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Aromatic compound
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Aromatic compounds or arenes are organic compounds "with a chemistry typified by benzene" and "cyclically conjugated."
The word "aromatic" originates from the past grouping of molecules based on odor, before their general chemical properties were understood. The current definition of aromatic compounds does not have any relation to their odor. Aromatic compounds are now defined as cyclic compounds satisfying Hückel's rule.
Aromatic compounds have the following general properties:
Arenes are typically split into two categories - benzoids, that contain a benzene derivative and follow the benzene ring model, and non-benzoids that contain other aromatic cyclic derivatives. Aromatic compounds are commonly used in organic synthesis and are involved in many reaction types, following both additions and removals, as well as saturation and dearomatization.
Heteroarenes.
Heteroarenes are aromatic compounds, where at least one methine or vinylene (-C= or -CH=CH-) group is replaced by a heteroatom: oxygen, nitrogen, or sulfur. Examples of non-benzene compounds with aromatic properties are furan, a heterocyclic compound with a five-membered ring that includes a single oxygen atom, and pyridine, a heterocyclic compound with a six-membered ring containing one nitrogen atom. Hydrocarbons without an aromatic ring are called aliphatic. Approximately half of compounds known in 2000 are described as aromatic to some extent.
Applications.
Aromatic compounds are pervasive in nature and industry. Key industrial aromatic hydrocarbons are benzene, toluene, xylene called BTX. Many biomolecules have phenyl groups including the so-called aromatic amino acids.
Benzene ring model.
Benzene, C6H6, is the least complex aromatic hydrocarbon, and it was the first one defined as such. Its bonding nature was first recognized independently by Joseph Loschmidt and August Kekulé in the 19th century. Each carbon atom in the hexagonal cycle has four electrons to share. One electron forms a sigma bond with the hydrogen atom, and one is used in covalently bonding to each of the two neighboring carbons. This leaves six electrons, shared equally around the ring in delocalized pi molecular orbitals the size of the ring itself. This represents the equivalent nature of the six carbon-carbon bonds all of bond order 1.5. This equivalency can also explained by resonance forms. The electrons are visualized as floating above and below the ring, with the electromagnetic fields they generate acting to keep the ring flat.
The circle symbol for aromaticity was introduced by Sir Robert Robinson and his student James Armit in 1925 and popularized starting in 1959 by the Morrison & Boyd textbook on organic chemistry. The proper use of the symbol is debated: some publications use it to "any" cyclic π system, while others use it only for those π systems that obey Hückel's rule. Some argue that, in order to stay in line with Robinson's originally intended proposal, the use of the circle symbol should be limited to monocyclic 6 π-electron systems. In this way the circle symbol for a six-center six-electron bond can be compared to the Y symbol for a three-center two-electron bond.
Benzene and derivatives of benzene.
Benzene derivatives have from one to six substituents attached to the central benzene core. Examples of benzene compounds with just one substituent are phenol, which carries a hydroxyl group, and toluene with a methyl group. When there is more than one substituent present on the ring, their spatial relationship becomes important for which the arene substitution patterns "ortho", "meta", and "para" are devised. When reacting to form more complex benzene derivatives, the substituents on a benzene ring can be described as either activated or deactivated, which are electron donating and electron withdrawing respectively. Activators are known as ortho-para directors, and deactivators are known as meta directors. Upon reacting, substituents will be added at the ortho, para or meta positions, depending on the directivity of the current substituents to make more complex benzene derivatives, often with several isomers. Electron flow leading to re-aromatization is key in ensuring the stability of such products.
For example, three isomers exist for cresol because the methyl group and the hydroxyl group (both ortho para directors) can be placed next to each other ("ortho"), one position removed from each other ("meta"), or two positions removed from each other ("para"). Given that both the methyl and hydroxyl group are ortho-para directors, the ortho and para isomers are typically favoured. Xylenol has two methyl groups in addition to the hydroxyl group, and, for this structure, 6 isomers exist.
Arene rings can stabilize charges, as seen in, for example, phenol (C6H5–OH), which is acidic at the hydroxyl (OH), as charge on the oxygen (alkoxide –O−) is partially delocalized into the benzene ring.
Non-benzylic arenes.
Although benzylic arenes are common, non-benzylic compounds are also exceedingly important. Any compound containing a cyclic portion that conforms to Hückel's rule and is not a benzene derivative can be considered a non-benzylic aromatic compound.
Monocyclic arenes.
Of annulenes larger than benzene, [12]annulene and [14]annulene are weakly aromatic compounds and [18]annulene, Cyclooctadecanonaene, is aromatic, though strain within the structure causes a slight deviation from the precisely planar structure necessary for aromatic categorization. Another example of a non-benzylic monocyclic arene is the cyclopropenyl (cyclopropenium cation), which satisfies Hückel's rule with an n equal to 0. Note, only the cationic form of this cyclic propenyl is aromatic, given that neutrality in this compound would violate either the octet rule or Hückel's rule.
Other non-benzylic monocyclic arenes include the aforementioned heteroarenes that can replace carbon atoms with other heteroatoms such as N, O or S. Common examples of these are the five-membered pyrrole and six-membered pyridine, both of which have a substituted nitrogen
Polycyclic aromatic hydrocarbons.
Polycyclic aromatic hydrocarbons, also known as polynuclear aromatic compounds (PAHs) are aromatic hydrocarbons that consist of fused aromatic rings and do not contain heteroatoms or carry substituents. Naphthalene is the simplest example of a PAH. PAHs occur in oil, coal, and tar deposits, and are produced as byproducts of fuel burning (whether fossil fuel or biomass). As pollutants, they are of concern because some compounds have been identified as carcinogenic, mutagenic, and teratogenic. PAHs are also found in cooked foods. Studies have shown that high levels of PAHs are found, for example, in meat cooked at high temperatures such as grilling or barbecuing, and in smoked fish. They are also a good candidate molecule to act as a basis for the earliest forms of life. In graphene the PAH motif is extended to large 2D sheets.
Reactions.
Aromatic ring systems participate in many organic reactions.
Substitution.
In aromatic substitution, one substituent on the arene ring, usually hydrogen, is replaced by another reagent. The two main types are electrophilic aromatic substitution, when the active reagent is an electrophile, and nucleophilic aromatic substitution, when the reagent is a nucleophile. In radical-nucleophilic aromatic substitution, the active reagent is a radical.
An example of electrophilic aromatic substitution is the nitration of salicylic acid, where a nitro group is added para to the hydroxide substituent:
Nucleophilic aromatic substitution involves displacement of a leaving group, such as a halide, on an aromatic ring. Aromatic rings usually nucleophilic, but in the presence of electron-withdrawing groups aromatic compounds undergo nucleophilic substitution. Mechanistically, this reaction differs from a common SN2 reaction, because it occurs at a trigonal carbon atom (sp2 hybridization).
Hydrogenation.
Hydrogenation of arenes create saturated rings. The compound 1-naphthol is completely reduced to a mixture of decalin-ol isomers.
The compound resorcinol, hydrogenated with Raney nickel in presence of aqueous sodium hydroxide forms an enolate which is alkylated with methyl iodide to 2-methyl-1,3-cyclohexandione:
Dearomatization.
In dearomatization reactions the aromaticity of the reactant is lost. In this regard, the dearomatization is related to hydrogenation. A classic approach is Birch reduction. The methodology is used in synthesis.
Arene-arene interactions.
Arene-arene interactions have attracted much attention. Pi-stacking (also called π–π stacking) refers to the presumptively attractive, noncovalent pi interactions between the pi bonds of aromatic rings, because of orbital overlap. According to some authors direct stacking of aromatic rings (the "sandwich interaction") is electrostatically repulsive.
More commonly observed are either a staggered stacking (parallel displaced) or pi-teeing (perpendicular T-shaped) interaction both of which are electrostatic attractive For example, the most commonly observed interactions between aromatic rings of amino acid residues in proteins is a staggered stacked followed by a perpendicular orientation. Sandwiched orientations are relatively rare.
Pi stacking is repulsive as it places carbon atoms with partial negative charges from one ring on top of other partial negatively charged carbon atoms from the second ring and hydrogen atoms with partial positive charges on top of other hydrogen atoms that likewise carry partial positive charges. In staggered stacking, one of the two aromatic rings is offset sideways so that the carbon atoms with partial negative charge in the first ring are placed above hydrogen atoms with partial positive charge in the second ring so that the electrostatic interactions become attractive. Likewise, pi-teeing interactions in which the two rings are oriented perpendicular to either other is electrostatically attractive as it places partial positively charged hydrogen atoms in close proximity to partially negatively charged carbon atoms. An alternative explanation for the preference for staggered stacking is due to the balance between van der Waals interactions (attractive dispersion plus Pauli repulsion).
These staggered stacking and π-teeing interactions between aromatic rings are important in nucleobase stacking within DNA and RNA molecules, protein folding, template-directed synthesis, materials science, and molecular recognition. Despite the wide use of term pi stacking in the scientific literature, there is no theoretical justification for its use.
Benzene dimer.
The benzene dimer is the prototypical system for the study of pi stacking, and is experimentally bound by 8–12 kJ/mol (2–3 kcal/mol) in the gas phase with a separation of 4.96 Å between the centers of mass for the T-shaped dimer. X-ray crystallography reveals perpendicular and offset parallel configurations for many simple aromatic compounds. Similar offset parallel or perpendicular geometries were observed in a survey of high-resolution x-ray protein crystal structures in the Protein Data Bank. Analysis of the aromatic amino acids phenylalanine, tyrosine, histidine, and tryptophan indicates that dimers of these side chains have many stabilizing interactions at distances larger than the average van der Waals radii.
The relative binding energies of the three geometries of the benzene dimer can be explained by a balance of quadrupole/quadrupole and London dispersion forces. While benzene does not have a dipole moment, it has a strong quadrupole moment. The local C–H dipole means that there is positive charge on the atoms in the ring and a correspondingly negative charge representing an electron cloud above and below the ring. The quadrupole moment is reversed for hexafluorobenzene due to the electronegativity of fluorine. The benzene dimer in the sandwich configuration is stabilized by London dispersion forces but destabilized by repulsive quadrupole/quadrupole interactions. By offsetting one of the benzene rings, the parallel displaced configuration reduces these repulsive interactions and is stabilized. The large polarizability of aromatic rings lead to dispersive interactions as major contribution to stacking effects. These play a major role for interactions of nucleobases e.g. in DNA. The T-shaped configuration enjoys favorable quadrupole/quadrupole interactions, as the positive quadrupole of one benzene ring interacts with the negative quadrupole of the other. The benzene rings are furthest apart in this configuration, so the favorable quadrupole/quadrupole interactions evidently compensate for diminished dispersion forces.
According to one model, electron-withdrawing substituents lowers the negative quadrupole of the aromatic ring and thereby favor parallel displaced and sandwich conformations. By contrast, electron donating groups increase the negative quadrupole, which may stabilize a T-shaped configuration with the proper geometry. They used a simple mathematical model based on sigma and pi atomic charges, relative orientations, and van der Waals interactions to qualitatively determine that electrostatics are dominant in substituent effects.
Hunter "et al." applied a more sophisticated chemical double mutant cycle with a hydrogen-bonded "zipper" to the issue of substituent effects in pi stacking interactions in proteins. However, the authors note that direct interactions with the ring substituents, discussed below, also make important contributions. Indeed, the interplay of these two factors may result in the complicated substituent- and geometry-dependent behavior of pi stacking interactions.
Some experimental and computational evidence suggests that pi stacking interactions are not governed primarily by electrostatic effects..
The relative contributions pi stacking have been borne out by computation. Trends based on electron donating or withdrawing substituents can be explained by exchange-repulsion and dispersion terms.
A molecular torsion balance from an aryl ester with two conformational states. The folded state had a well-defined pi stacking interaction with a T-shaped geometry, whereas the unfolded state had no aryl–aryl interactions. The NMR chemical shifts of the two conformations were distinct and could be used to determine the ratio of the two states, which was interpreted as a measure of intramolecular forces. The authors report that a preference for the folded state is not unique to aryl esters. For example, the cyclohexyl ester favored the folded state more so than the phenyl ester, and the tert-butyl ester favored the folded state by a preference greater than that shown by any aryl ester. This suggests that aromaticity is not a strict requirement for favorable interaction with an aromatic ring.
Other evidence for non-aromatic pi stacking interactions results include critical studies in theoretical chemistry, explaining the underlying mechanisms of empirical observations. Grimme reported that the interaction energies of smaller dimers consisting of one or two rings are very similar for both aromatic and saturated compounds. This finding is of particular relevance to biology, and suggests that the contribution of pi systems to phenomena such as stacked nucleobases may be overestimated. However, it was shown that an increased stabilizing interaction is seen for large aromatic dimers. As previously noted, this interaction energy is highly dependent on geometry. Indeed, large aromatic dimers are only stabilized relative to their saturated counterparts in a sandwich geometry, while their energies are similar in a T-shaped interaction.
A more direct approach to modeling the role of aromaticity was taken by Bloom and Wheeler. The authors compared the interactions between benzene and either 2-methylnaphthalene or its non-aromatic isomer, 2-methylene-2,3-dihydronaphthalene. The latter compound provides a means of conserving the number of p-electrons while, however, removing the effects of delocalization. Surprisingly, the interaction energies with benzene are higher for the non-aromatic compound, suggesting that pi-bond localization is favorable in pi stacking interactions. The authors also considered a homodesmotic dissection of benzene into ethylene and 1,3-butadiene and compared these interactions in a sandwich with benzene. Their calculation indicates that the interaction energy between benzene and homodesmotic benzene is higher than that of a benzene dimer in both sandwich and parallel displaced conformations, again highlighting the favorability of localized pi-bond interactions. These results strongly suggest that aromaticity is not required for pi stacking interactions in this model.
Even in light of this evidence, Grimme concludes that pi stacking does indeed exist. However, he cautions that smaller rings, particularly those in T-shaped conformations, do not behave significantly differently from their saturated counterparts, and that the term should be specified for larger rings in stacked conformations which do seem to exhibit a cooperative pi electron effect.
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An abbey is a type of monastery used by members of a religious order under the governance of an abbot or abbess. Abbeys provide a complex of buildings and land for religious activities, work, and housing of Christian or Buddhist monks and nuns.
The concept of the abbey has developed over many centuries from the early monastic ways of religious men and women where they would live isolated from the lay community about them. Religious life in an abbey may be monastic. An abbey may be the home of an enclosed religious order or may be open to visitors. The layout of the church and associated buildings of an abbey often follows a set plan determined by the founding religious order.
Abbeys are often self-sufficient while using any abundance of produce or skill to provide care to the poor and needy, refuge to the persecuted, or education to the young. Some abbeys offer accommodation to people who are seeking spiritual retreat. There are many famous abbeys across the Mediterranean Basin and Europe.
Monastic origins of the abbey.
Ascetics and anchorites.
The earliest known Christian monasteries were groups of huts built near the residence of a famous ascetic or other holy person. Disciples wished to be close to their holy man or woman in order to study their doctrine or imitate their way of life.
In the earliest times of Christian monasticism, ascetics would live in social isolation but near a village church. They would subsist whilst donating any excess produce to the poor. However, increasing religious fervor about the ascetic's ways and or persecution of them would drive them further away from their community and further into solitude. For instance, the cells and huts of anchorites (religious recluses) have been found in the deserts of Egypt.
In 312 AD, Anthony the Great retired to the Thebaid region of Egypt to escape the persecution of the Emperor Maximian. Anthony was the best known of the anchorites of his time due to his degree of austerity, sanctity and his powers of exorcism. The deeper he withdrew into the wilderness, the more numerous his disciples became. They refused to be separated from him and built their cells close to him. This became a first true monastic community. According to August Neander, Anthony inadvertently became the founder of a new mode of living in common, Coenobitism.
Laurae and Coenobia.
At Tabennae on the Nile, in Upper Egypt, Saint Pachomius laid the foundations for the coenobitical life by arranging everything in an organized manner. He built several monasteries, each with about 1,600 separate cells laid out in lines. These cells formed an encampment where the monks slept and performed some of their manual tasks. There were nearby large halls such as the church, refectory, kitchen, infirmary, and guest house for the monk's common needs. An enclosure protecting all these buildings gave the settlement the appearance of a walled village. This layout, known as the "laurae" (lanes), became popular throughout Israel.
As well as the "laurae", communities known as "caenobia" developed. These were monasteries where monks lived a common life together. The monks were not permitted to retire to the cells of a laurae before they had undergone a lengthy period of training. In time, this form of common life superseded that of the older laurae.
In the late 300s AD, Palladius visited the Egyptian monasteries. He described three hundred members of the coenobium of Panopolis. There were fifteen tailors, seven smiths, four carpenters, twelve camel-drivers and fifteen tanners. These people were divided into subgroups, each with its own "oeconomus". A chief steward was at the head of the monastery.
The produce of the monastery was brought to Alexandria for sale. The moneys raised were used to purchase stores for the monastery or were given away as charity. Twice in the year, the superiors of several coenobia met at the chief monastery, under the presidency of an "archimandrite" (the "chief of the fold" from the word, "miandra" (a sheepfold)) in order to make their reports. Chrysostom recorded the workings of a coenobia in the vicinity of Antioch in Syria. The monks lived in separate huts ("kalbbia") which formed a religious hamlet on the mountainside. They were subject to an abbot, and observed a common rule.
Great Lavra, Mount Athos.
The layout of the monastic coenobium was influenced by a number of factors. These included a need for defence, economy of space, and convenience of access. The layout of buildings became compact and orderly. Larger buildings were erected and defence was provided by strong outside walls. Within the walls, the buildings were arranged around one or more open courts surrounded by cloisters. The usual arrangement for monasteries of the Eastern world is exemplified in the plan of the convent of the Great Lavra at Mount Athos.
With reference to the diagram, right, the convent of the Great Lavra is enclosed within a strong and lofty blank stone wall. The area within the wall is between three and four acres (12,000 and 16,000 m2). The longer side is about in length. There is only one entrance, which is located on the north side (A), defended by three iron doors. Near the entrance is a large tower (M), a constant feature in the monasteries of the Levant (Eastern Mediterranean area). There is a small postern gate at L.
The enceinte comprises two large open courts, surrounded with buildings connected with cloister galleries of wood or stone. The outer court, which is the larger by far, contains the granaries and storehouses (K), the kitchen (H) and other offices connected with the refectory (G). Immediately adjacent to the gateway is a two-storied guest-house, entered from a cloister (C). The inner court is surrounded by a cloister (EE) from which one enters the monks' cells (II).
In the centre of this court stands the katholikon or conventual church, a square building with an apse of the cruciform domical Byzantine type, approached by a domed narthex. In front of the church stands a marble fountain (F), covered by a dome supported on columns.
Opening from the western side of the cloister, but actually standing in the outer court, is the refectory (G), a large cruciform (cross shaped) building, about square, decorated within with frescoes of saints. At the upper end is a semicircular recess, similar to the triclinium of the Lateran Palace in Rome, in which is placed the seat of the hegumenos or abbot. This apartment is chiefly used as a meeting place, with the monks usually taking their meals in their separate cells.
Adoption of the Roman villa plan.
Monasticism in the West began with the activities of Benedict of Nursia (born 480 AD). Near Nursia, a town in Perugia, Italy, a first abbey was established at Monte Cassino (529 AD). Between 520 and 700 AD, monasteries were built which were spacious and splendid. All the city states of Italy hosted a Benedictine convent as did the cities of England, France and Spain. By 1415 AD, the time of the Council of Constance, 15,070 Benedictine monasteries had been established.
The early Benedictine monasteries, including the first at Monte Cassino, were constructed on the plan of the Roman villa. The layout of the Roman villa was quite consistent throughout the Roman Empire and where possible, the monks reused available villas in sound repair. This was done at Monte Cassino.
However, over time, changes to the common villa lay out occurred. The monks required buildings which suited their religious and day-to-day activities. No overriding specification was demanded of the monks but the similarity of their needs resulted in uniformity of design of abbeys across Europe. Eventually, the buildings of a Benedictine abbey were built in a uniform lay out, modified where necessary, to accommodate local circumstances.
Abbey of St Gall.
The plan of the Abbey of Saint Gall (719 AD) in what is now Switzerland indicates the general arrangement of a Benedictine monastery of its day. According to the architect Robert Willis (architect) (1800–1875) the Abbey's lay out is that of a town of individual houses with streets running between them. The abbey was planned in compliance with the Benedictine rule that, if possible, a monastery should be self-contained. For instance, there was a mill, a bakehouse, stables, and cattle stalls. In all, there were thirty-three separate structures; mostly one level wooden buildings.
The Abbey church occupied the centre of a quadrangular area, about square. On the eastern side of the north transept of the church was the "scriptorium" or writing-room, with a library above.
The church and nearby buildings ranged about the cloister, a court about which there was a covered arcade which allowed sheltered movement between the buildings. The nave of the church was on the north boundary of the cloister.
On the east side of the cloister, on the ground floor, was the "pisalis" or "calefactory". This was a common room, warmed by flues beneath the floor. Above the common room was the dormitory. The dormitory opened onto the cloister and also onto the south transept of the church. This enabled the monks to attend nocturnal services. A passage at the other end of the dormitory lead to the "necessarium" (latrines).
On the south side of the cloister was the refectory. The kitchen, at the west end of the refectory was accessed via an anteroom and a long passage. Nearby were the bake house, brew house and the sleeping-rooms of the servants. The upper story of the refectory was called the "vestiarium" (a room where the ordinary clothes of the monks were stored).
On the western side of the cloister was another two-story building with a cellar on the ground floor and the larder and store-room on the upper floor. Between this building and the church was a parlour for receiving visitors. One door of the parlour led to the cloisters and the other led to the outer part of the Abbey.
Against the outer wall of the church was a school and headmaster's house. The school consisted of a large schoolroom divided in the middle by a screen or partition, and surrounded by fourteen little rooms, the "dwellings of the scholars". The abbot's home was near the school.
To the north of the church and to the right of the main entrance to the Abbey, was a residence for distinguished guests. To the left of the main entrance was a building to house poor travellers and pilgrims. There was also a building to receive visiting monks. These "hospitia" had a large common room or refectory surrounded by bed rooms. Each hospitium had its own brewhouse and bakehouse, and the building for more prestigious travellers had a kitchen and storeroom, with bedrooms for the guests' servants and stables for their horses. The monks of the Abbey lived in a house built against the north wall of the church.
The whole of the southern and western areas of the Abbey were devoted to workshops, stables and farm-buildings including stables, ox-sheds, goatstables, piggeries, and sheep-folds, as well as the servants' and labourers' quarters.
In the eastern part of the Abbey there was a group of buildings representing in layout, two complete miniature monasteries. That is, each had a covered cloister surrounded by the usual buildings such as the church, the refectory, the dormitory and so on. A detached building belonging to each contained a bathroom and a kitchen.
One of the miniature complexes was called the "oblati". These were the buildings for the novices. The other complex was a hospital or infirmary for the care of sick monks. This infirmary complex included a physician's residence, a physic garden, a drug store, and a chamber for the critically ill. There was also a room for bloodletting and purging. The physic garden occupied the north east corner of the Abbey.
In the southernmost area of the abbey was the workshop containing utilities for shoemakers, saddlers (or shoemakers, sellarii), cutlers and grinders, trencher-makers, tanners, curriers, fullers, smiths and goldsmiths. The tradesmen's living quarters were at the rear of the workshop. Here, there were also farm buildings, a large granary and threshing-floor, mills, and malthouse. At the south-east corner of the Abbey were hen and duck houses, a poultry-yard, and the dwelling of the keeper. Nearby was the kitchen garden which complemented the physic garden and a cemetery orchard.
Every large monastery had priories. A priory was a smaller structure or entities which depended on the monastery. Some were small monasteries accommodating five or ten monks. Others were no more than a single building serving as residence or a farm offices. The outlying farming establishments belonging to the monastic foundations were known as "villae" or "granges". They were usually staffed by lay-brothers, sometimes under the supervision of a monk.
Benedictine abbeys in England.
Many of today's cathedrals in England were originally Benedictine monasteries. These included Canterbury, Chester, Durham, Ely, Gloucester, Norwich, Peterborough, Rochester, Winchester, and Worcester. Shrewsbury Abbey in Shropshire was founded as a Benedictine monastery by the Normans in 1083.
Westminster Abbey.
Westminster Abbey was founded in the tenth century by Saint Dunstan who established a community of Benedictine monks. The only traces of St Dunstan's monastery remaining are round arches and massive supporting columns of the undercroft and the Pyx Chamber.
The cloister and buildings lie directly to the south of the church. Parallel to the nave, on the south side of the cloister, was a refectory, with a lavatory at the door. On the eastern side, there was a dormitory, raised on a vaulted substructure and communicating with the south transept and a chapter house (meeting room). A small cloister lay to the south-east of the large cloister. Beyond that was an infirmary with a table hall and a refectory for those who were able to leave their chambers. At the west entrance to the Abbey, there was a house and a small courtyard for the abbot.
St Mary's Abbey, York.
In 1055, St Mary's Abbey, York was built in England's north by the Order of Saint Benedict. It followed the common plan. The entrance to the abbey was through a strong gate on the northern side. Close to the entrance was a chapel. This was for visitors arriving at the Abbey to make their devotions. Near the gate was the "hospitium" (guest hall). The buildings are completely ruined, but the walls of the nave and the cloisters are still visible on the grounds of the Yorkshire Museum.
The Abbey was surrounded by fortified walls on three sides. The River Ouse bordered the fourth side. The stone walls remain as an excellent example of English abbey walls.
Reforms at the Abbey of Cluny.
The Abbey of Cluny was founded by William I, Duke of Aquitaine in 910 AD at Cluny, Saône-et-Loire, France. The Abbey was built in the Romanesque style. The Abbey was noted for its strict observance of the Rule of Saint Benedict. However, reforms resulted in many departures from this precedent. The Cluniac Reforms brought focus to the traditions of monastic life, encouraging art and the caring of the poor. The reforms quickly spread by the founding of new abbey complexes and by adoption of the reforms by existing abbeys. By the twelfth century, the Abbey of Cluny was the head of an order consisting of 314 monasteries.
The church at the Abbey was commenced in 1089 AD by Hugh of Cluny, the sixth abbot. It was finished and consecrated by Pope Innocent II around 1132 AD. The church was regarded as one of the wonders of the Middle Ages. At in length, it was the largest church in Christendom until the completion of St Peter's Basilica at Rome. The church consisted of five naves, a narthex (ante-church) which was added in 1220 AD, and several towers. Together with the conventual buildings, it covered an area of twenty-five acres.
In the Dechristianization of France during the French Revolution in 1790 AD, the Abbey church was bought by the town and almost entirely destroyed. As of 2025, however, fragments of the original Abbey still stand and archaeological excavations have intermittently been conducted over the past century, yielding a massively important and rich source of information.
English Cluniac houses.
The first English house of the Cluniac order was built at Lewes, Sussex. It was founded by William de Warenne, 1st Earl of Surrey in about 1077 AD. All but one of the Cluniac houses in Britain were known as priories, symbolizing their subordination to the Abbot of Cluny. All the Cluniac houses in England and Scotland were French colonies, governed by French priors who travelled to the Abbey of Cluny to consult or be consulted (unless the abbot of Cluny chose to come to Britain, which happened rarely). The priory at Paisley was an exception. In 1245 AD it was raised to the status of an abbey, answerable only to the Pope.
Abbeys of the Augustinian Canons.
The Augustinian (or "Austin") canons were an order of regular clergy within the hierarchy of the Catholic church. They held a position between monks and secular canons. They were known as "Black canons" because of the colour of their habits. In 1105 AD, the first house of the order was established at St Botolph's Priory, Colchester, Essex.
The canons built very long naves to accommodate large congregations. The choirs were also long. Sometimes, as at Llanthony Priory and Christchurch, Dorset (Twynham), the choir was closed from the aisles. At other abbeys of the order, such as Bolton Abbey or Kirkham Priory, there were no aisles. The nave in the northern houses of the order often had only a north aisle (this is the case at Bolton, Brinkburn Priory and Lanercost Priory). The arrangement of the monastic buildings followed the ordinary plan. The prior's lodge was usually attached to the southwest angle of the nave.
The Austin canons' house at Thornton, Lincolnshire had a large and magnificent gatehouse. The upper floors of the gatehouse formed the guest-house. The chapter-house was octagonal in shape.
Augustinian abbeys.
Premonstratensians (Norbertians).
The Premonstratensian regular canons, or "White canons", were of an order founded in 1119 AD by Norbert of Xanten. The order was a reformed branch of the Augustinian canons. From a marshy area in the Forest of Coucy in the diocese of Laon, the order spread widely. Even in Norbert's lifetime, the order had built abbeys in Aleppo, Syria, and in the Kingdom of Jerusalem. Of the Abbey of Saint Samuel, Denys Pringle wrote, "The Premonstatensian abbey of Saint Samuel was a daughter house of Prémontré itself. Its abbot had the status of a suffragan of the patriarch of Jerusalem, with the right to a cross, but not to a mitre nor a ring." It long maintained its rigid austerity, though in later years the abbey grew wealthier, and its members indulged in more frequent luxuries.
Just after 1140 AD, the Premonstratensians were brought to England. Their first settlement was at Newhouse Abbey, Lincolnshire, near the Humber tidal estuary. There were as many as thirty-five Premonstratensian abbeys in England. The head abbey in England was at Welbeck Abbey but the best preserved are Easby Abbey in Yorkshire, and Bayham Old Abbey in Kent.
The layout of Easby Abbey is irregular due to its position on the edge of a steep river bank. The cloister is duly placed on the south side of the church, and the chief buildings occupy their usual positions around it. However, the cloister garth (quadrangle), as at Chichester, is not rectangular, and thus, all the surrounding buildings are positioned in an awkward fashion. The church follows the plan adopted by the Austin canons in their northern abbeys, and has only one aisle to the north of the nave, while the choir is long, narrow and without an aisle. Each transept has an aisle to the east, forming three chapels.
The church at Bayham Old Abbey had no aisles in the nave or the choir. The latter terminated in a three-sided apse. The church is remarkable for its extreme narrowness in proportion to its length. While the building is long, it is not more than wide. Premonstratensian canons did not care to have congregations nor possessions. Therefore, they built their churches in the shape of a long room.
Cistercian abbeys.
The Cistercians, a Benedictine reform group, were established at Cîteaux in 1098 AD by Robert of Molesme, Abbot of Molesme, for the purpose of restoring, as far as possible, the literal observance of the Rule of Saint Benedict. La Ferté, Pontigny, Clairvaux, and Morimond were the first four abbeys to follow Cîteaux's example and others followed. The monks of Cîteaux created the well known vineyards of Clos-Vougeot and Romanée in Burgundy.
The Cistercian principle of rigid self-abnegation carried over to the design of the order's churches and buildings. The defining architectural characteristic of the Cistercian abbeys was extreme simplicity and plainness. Only a single, central tower was permitted, and that was usually very low. Unnecessary pinnacles and turrets were prohibited. The triforium was omitted. The windows were usually plain and undivided, and it was forbidden to decorate them with stained glass. All needless ornament was proscribed. The crosses were made of wood and the candlesticks of iron.
The same principle governed the choice of site for Cistercian abbeys in that a most dismal site might be improved by the building of an abbey. The Cistercian monasteries were founded in deep, well-watered valleys, always standing at a stream's edge. The building might extend over the water as is the case at Fountains Abbey. These valleys, now rich and productive, had a very different appearance when the brethren first chose them as their place of retreat. Wide swamps, deep morasses, tangled thickets, and wild, impassable forests were their prevailing features. Clara Vallis of St Bernard, now the "bright valley" was originally, the "Valley of Wormwood". It was an infamous den of robbers.
Copts.
The plan of a Coptic Orthodox monastery, from Lenoir, shows a church of three aisles, with cellular apses, and two ranges of cells on either side of an oblong gallery.
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Annales school
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The "Annales" school () is a group of historians associated with a style of historiography developed by French historians in the 20th century to stress long-term social history. It is named after its scholarly journal "Annales. Histoire, Sciences Sociales", which remains the main source of scholarship, along with many books and monographs. The school has been influential in setting the agenda for historiography in France and numerous other countries, especially regarding the use of social scientific methods by historians, emphasizing social and economic rather than political or diplomatic themes.
The school deals primarily with late medieval and early modern Europe (before the French Revolution), with little interest in later topics. It has dominated French social history and heavily influenced historiography in Europe and Latin America. Prominent leaders include co-founders Lucien Febvre (1878–1956), Henri Hauser (1866–1946) and Marc Bloch (1886–1944). The second generation was led by Fernand Braudel (1902–1985) and included Georges Duby (1919–1996), Pierre Goubert (1915–2012), Robert Mandrou (1921–1984), Pierre Chaunu (1923–2009), Jacques Le Goff (1924–2014), and Ernest Labrousse (1895–1988). Institutionally it is based on the "Annales" journal, the SEVPEN publishing house, the (FMSH), and especially the 6th Section of the École pratique des hautes études, all based in Paris. A third generation was led by Emmanuel Le Roy Ladurie (1929–2023) and includes Jacques Revel, and Philippe Ariès (1914–1984), who joined the group in 1978. The third generation stressed history from the point of view of mentalities, or . The fourth generation of "Annales" historians, led by Roger Chartier (born 1945), clearly distanced itself from the approach, replaced by the cultural and linguistic turn, which emphasizes the social history of cultural practices.
The main scholarly outlet has been the journal ("Annals of Economic and Social History"), founded in 1929 by Lucien Febvre and Marc Bloch, which broke radically with traditional historiography by insisting on the importance of taking all levels of society into consideration and emphasized the collective nature of mentalities. Its contributors viewed events as less fundamental than the mental frameworks that shaped decisions and practices. However, informal successor as head of the school was Le Roy Ladurie. Multiple responses were attempted by the school. Scholars moved in multiple directions, covering in disconnected fashion the social, economic, and cultural history of different eras and different parts of the globe. By the time of the crisis the school was building a vast publishing and research network reaching across France, Europe, and the rest of the world. Influence spread out from Paris, but few new ideas came in. Much emphasis was given to quantitative data, seen as the key to unlocking all of social history. However, the "Annales" ignored the developments in quantitative studies underway in the U.S. and Britain, which reshaped economic, political, and demographic research. An attempt to require an "Annales"-written textbook for French schools was rejected by the government. By 1980 postmodern sensibilities undercut confidence in overarching metanarratives. As Jacques Revel notes, the success of the "Annales" school, especially its use of social structures as explanatory forces, contained the seeds of its own downfall, for there is "no longer any implicit consensus on which to base the unity of the social, identified with the real". The "Annales" school kept its infrastructure, but lost its .
The journal.
The journal began in Strasbourg as ; it moved to Paris and kept the same name from 1929 to 1939. It was successively renamed (1939–1942, 1945), (1942–1944), (1946–1994), and (1994– ).
In 1962, Braudel and Gaston Berger used Ford Foundation money and government funds to create a new independent foundation, the (FMSH), which Braudel directed from 1970 until his death. In 1970, the 6th Section and the "Annales" relocated to the FMSH building. FMSH set up elaborate international networks to spread the "Annales" gospel across Europe and the world. In 2013, it began publication of an English language edition, with all the articles translated.
The scope of topics covered by the journal is vast and experimental—there is a search for total history and new approaches. The emphasis is on social history, and very long-term trends, often using quantification and paying special attention to geography and to the intellectual world view of common people, or "mentality" (). Little attention is paid to political, diplomatic, or military history, or to biographies of famous men. Instead the "Annales" focused attention on the synthesizing of historical patterns identified from social, economic, and cultural history, statistics, medical reports, family studies, and even psychoanalysis.
Origins.
The "Annales" was founded and edited by Marc Bloch and Lucien Febvre in 1929, while they were teaching at the University of Strasbourg and later in Paris. These authors, the former a medieval historian and the latter an early modernist, quickly became associated with the distinctive "Annales" approach, which combined geography, history, and the sociological approaches of the (many members of which were their colleagues at Strasbourg) to produce an approach which rejected the predominant emphasis on politics, diplomacy and war of many 19th and early 20th-century historians as spearheaded by historians whom Febvre called Les Sorbonnistes. Instead, they pioneered an approach to a study of long-term historical structures () over events and political transformations. Geography, material culture, and what later Annalistes called , or the psychology of the epoch, are also characteristic areas of study. The goal of the Annales was to undo the work of the Sorbonnistes, to turn French historians away from the narrowly political and diplomatic toward the new vistas in social and economic history.
Co-founder Marc Bloch (1886–1944) was a quintessential modernist who studied at the elite École Normale Supérieure, and in Germany, serving as a professor at the University of Strasbourg until he was called to the Sorbonne in Paris in 1936 as professor of economic history. Bloch's interests were highly interdisciplinary, influenced by the geography of Paul Vidal de la Blache (1845–1918) and the sociology of Émile Durkheim (1858–1917). His own ideas, especially those expressed in his masterworks, "French Rural History" (, 1931) and "Feudal Society", were incorporated by the second-generation Annalistes, led by Fernand Braudel.
Precepts.
Georges Duby, a leader of the school, wrote that the history he taught:
relegated the sensational to the sidelines and was reluctant to give a simple accounting of events, but strove on the contrary to pose and solve problems and, neglecting surface disturbances, to observe the long and medium-term evolution of economy, society and civilisation.
The Annalistes, especially Lucien Febvre, advocated a , or , a complete study of a historic problem.
Postwar.
Bloch was shot by the Gestapo during the German occupation of France in World War II for his active membership of the French Resistance, and Febvre carried on the "Annales" approach in the 1940s and 1950s. It was during this time that he mentored Braudel, who would become one of the best-known exponents of this school. Braudel's work came to define a "second" era of "Annales" historiography and was influential throughout the 1960s and 1970s, especially for his work on the Mediterranean region in the era of Philip II of Spain.
Braudel developed the idea, often associated with Annalistes, of different modes of historical time: (the quasi motionless history) of historical geography, the history of social, political and economic structures (), and the history of men and events, in the context of their structures.
While authors such as Emmanuel Le Roy Ladurie, Marc Ferro and Jacques Le Goff continue to carry the "Annales" banner, today the "Annales" approach has been less distinctive as more and more historians do work in cultural history, political history and economic history.
Bloch's (1924) looked at the long-standing folk belief that the king could cure scrofula by his thaumaturgic touch. The kings of France and England indeed regularly practiced the ritual. Bloch was not concerned with the effectiveness of the royal touch—he acted instead like an anthropologist in asking why people believed it and how it shaped relations between king and commoner. The book was highly influential in introducing comparative studies (in this case France and England), as well as long durations ("longue durée") studies spanning several centuries, even up to a thousand years, downplaying short-term events. Bloch's revolutionary charting of mentalities, or , resonated with scholars who were reading Freud and Proust. In the 1960s, Robert Mandrou and Georges Duby harmonized the concept of history with Fernand Braudel's structures of historical time and linked mentalities with changing social conditions. A flood of studies based on these approaches appeared during the 1970s and 1980s. By the 1990s, however, history had become interdisciplinary to the point of fragmentation, but still lacked a solid theoretical basis. While not explicitly rejecting history, younger historians increasingly turned to other approaches.
Braudel.
Fernand Braudel became the leader of the second generation after 1945. He obtained funding from the Rockefeller Foundation in New York and founded the 6th Section of the Ecole Pratique des Hautes Etudes, which was devoted to the study of history and the social sciences. It became an independent degree-granting institution in 1975 under the name École des Hautes Études en Sciences Sociales (EHESS). Braudel's followers admired his use of the approach to stress slow, and often imperceptible effects of space, climate and technology on the actions of human beings in the past. The "Annales" historians, after living through two world wars and incredible political upheavals in France, were deeply uncomfortable with the notion that multiple ruptures and discontinuities created history. They preferred to stress inertia and the longue durée. Special attention was paid to geography, climate, and demography as long-term factors. They believed the continuities of the deepest structures were central to history, beside which upheavals in institutions or the superstructure of social life were of little significance, for history lies beyond the reach of conscious actors, especially the will of revolutionaries. They rejected the Marxist idea that history should be used as a tool to foment and foster revolutions. In turn the Marxists called them conservatives.
Braudel's first book, (1949) ("The Mediterranean and the Mediterranean World in the Age of Philip II"), was his most influential. This vast panoramic view used ideas from other social sciences, employed effectively the technique of the longue durée, and downplayed the importance of specific events and individuals. It stressed geography but not . It was widely admired, but most historians did not try to replicate it and instead focused on their specialized monographs. The book dramatically raised the worldwide profile of the Annales School.
In 1951, historian Bernard Bailyn published a critique of , which he framed as dichotomizing politics and society.
Regionalism.
Before "Annales", French history supposedly happened in Paris. Febvre broke decisively with this paradigm in 1912, with his sweeping doctoral thesis on . The geography and social structure of this region overwhelmed and shaped the king's policies.
The "Annales" historians did not try to replicate Braudel's vast geographical scope in . Instead they focused on regions in France over long stretches of time. The most important was the study of "The Peasants of Languedoc" by Braudel's star pupil and successor Emmanuel Le Roy Ladurie. The regionalist tradition flourished especially in the 1960s and 1970s in the work of Pierre Goubert in 1960 on Beauvais and René Baehrel on Basse-Provence. "Annales" historians in the 1970s and 1980s turned to urban regions, including Pierre Deyon (Amiens), Maurice Garden (Lyon), Jean-Pierre Bardet (Rouen), Georges Freche (Toulouse), Gregory Hanlon (Agen and Layrac), and Jean-Claude Perrot (Caen). By the 1970s the shift was underway from the earlier economic history to cultural history and the history of mentalities.
Impact outside France.
The "Annales" school systematically reached out to create an impact on other countries. Its success varied widely. The "Annales" approach was especially well received in Italy and Poland. Franciszek Bujak (1875–1953) and Jan Rutkowski (1886–1949), the founders of modern economic history in Poland and of the journal (1931– ), were attracted to the innovations of the Annales school. Rutkowski was in contact with Bloch and others, and published in the "Annales". After the Communists took control in the 1940s Polish scholars were safer working on the Middle Ages and the early modern era rather than contemporary history. After the "Polish October" of 1956 the Sixth Section in Paris welcomed Polish historians and exchanges between the circle of the "Annales" and Polish scholars continued until the early 1980s. The reciprocal influence between the French school and Polish historiography was particularly evident in studies on the Middle Ages and the early modern era studied by Braudel.
In South America the "Annales" approach became popular. From the 1950s Federico Brito Figueroa was the founder of a new Venezuelan historiography based largely on the ideas of the Annales School. Brito Figueroa carried his conception of the field to all levels of university study, emphasizing a systematic and scientific approach to history and placing it squarely in the social sciences. Spanish historiography was influenced by the "Annales School" starting in 1950 with Jaume Vicens Vives (1910–1960). In Mexico, exiled Republican intellectuals extended the Annales approach, particularly from the Center for Historical Studies of El Colegio de México, the leading graduate studies institution of Latin America.
British historians, apart from a few Marxists, were generally hostile. Academic historians decidedly sided with Geoffrey Elton's "The Practice of History" against Edward Hallett Carr's "What Is History?" One of the few British historians who were sympathetic towards the work of the "Annales" school was Hugh Trevor-Roper. Among American academics, founding figure in American history of technology Lynn White Jr. dedicated his seminal and controversial book "Medieval Technology and Social Change" to "Annales" founder Marc Bloch. Both the American and the "Annales" historians picked up important family reconstitution techniques from French demographer Louis Henry.
The Wageningen school centered on Bernard Slicher van Bath was viewed internationally as a Dutch counterpart of the Annales school, although Slicher van Bath himself vehemently rejected the idea of a quantitative "school" of historiography.
The "Annales" school has been cited as a key influence in the development of World Systems Theory by sociologist Immanuel Wallerstein.
Current.
The current leader is Roger Chartier, who is Directeur d'Études at the École des Hautes Études en Sciences Sociales in Paris, Professeur in the Collège de France, and Annenberg Visiting professor of history at the University of Pennsylvania. He frequently lectures and teaches in the United States, Spain, Mexico, Brazil and Argentina. His work in Early Modern European History focuses on the history of education, the history of the book and the history of reading. Recently, he has been concerned with the relationship between written culture as a whole and literature (particularly theatrical plays) for France, England and Spain. His work in this specific field (based on the criss-crossing between literary criticism, bibliography, and sociocultural history) is connected to broader historiographical and methodological interests which deal with the relation between history and other disciplines: philosophy, sociology, anthropology.
Chartier's typical undergraduate course focuses upon the making, remaking, dissemination, and reading of texts in early modern Europe and America. Under the heading of "practices", his class considers how readers read and marked up their books, forms of note-taking, and the interrelation between reading and writing from copying and translating to composing new texts. Under the heading of "materials", his class examines the relations between different kinds of writing surfaces (including stone, wax, parchment, paper, walls, textiles, the body, and the heart), writing implements (including styluses, pens, pencils, needles, and brushes), and material forms (including scrolls, erasable tables, codices, broadsides and printed forms and books). Under the heading of "places", his class explores where texts were made, read, and listened to, including monasteries, schools and universities, offices of the state, the shops of merchants and booksellers, printing houses, theaters, libraries, studies, and closets. The texts for his course include the "Bible", translations of Ovid, "Hamlet", "Don Quixote", Montaigne's essays, Pepys's diary, Richardson's "Pamela", and Franklin's autobiography.
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Antimatter
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In modern physics, antimatter is defined as matter composed of the antiparticles (or "partners") of the corresponding particles in "ordinary" matter, and can be thought of as matter with reversed charge and parity, or going backward in time (see CPT symmetry). Antimatter occurs in natural processes like cosmic ray collisions and some types of radioactive decay, but only a tiny fraction of these have successfully been bound together in experiments to form antiatoms. Minuscule numbers of antiparticles can be generated at particle accelerators, but total artificial production has been only a few nanograms. No macroscopic amount of antimatter has ever been assembled due to the extreme cost and difficulty of production and handling. Nonetheless, antimatter is an essential component of widely available applications related to beta decay, such as positron emission tomography, radiation therapy, and industrial imaging.
In theory, a particle and its antiparticle (for example, a proton and an antiproton) have the same mass, but opposite electric charge, and other differences in quantum numbers.
A collision between any particle and its anti-particle partner leads to their mutual annihilation, giving rise to various proportions of intense photons (gamma rays), neutrinos, and sometimes less-massive particleantiparticle pairs. The majority of the total energy of annihilation emerges in the form of ionizing radiation. If surrounding matter is present, the energy content of this radiation will be absorbed and converted into other forms of energy, such as heat or light. The amount of energy released is usually proportional to the total mass of the collided matter and antimatter, in accordance with the notable mass–energy equivalence equation, .
Antiparticles bind with each other to form antimatter, just as ordinary particles bind to form normal matter. For example, a positron (the antiparticle of the electron) and an antiproton (the antiparticle of the proton) can form an antihydrogen atom. The nuclei of antihelium have been artificially produced, albeit with difficulty, and are the most complex anti-nuclei so far observed. Physical principles indicate that complex antimatter atomic nuclei are possible, as well as anti-atoms corresponding to the known chemical elements.
There is strong evidence that the observable universe is composed almost entirely of ordinary matter, as opposed to an equal mixture of matter and antimatter. This asymmetry of matter and antimatter in the visible universe is one of the great unsolved problems in physics. The process by which this inequality between matter and antimatter particles is hypothesised to have occurred is called baryogenesis.
Definitions.
Antimatter particles carry the same charge as matter particles, but of opposite sign. That is, an antiproton is negatively charged and an antielectron (positron) is positively charged. Neutrons do not carry a net charge, but their constituent quarks do. Protons and neutrons have a baryon number of +1, while antiprotons and antineutrons have a baryon number of –1. Similarly, electrons have a lepton number of +1, while that of positrons is –1. When a particle and its corresponding antiparticle collide, they are both converted into energy.
The French term for "made of or pertaining to antimatter", , led to the initialism "C.T." and the science fiction term , as used in such novels as "Seetee Ship".
Conceptual history.
The idea of negative matter appears in past theories of matter that have now been abandoned. Using the once popular vortex theory of gravity, the possibility of matter with negative gravity was discussed by William Hicks in the 1880s. Between the 1880s and the 1890s, Karl Pearson proposed the existence of "squirts" and sinks of the flow of aether. The squirts represented normal matter and the sinks represented negative matter. Pearson's theory required a fourth dimension for the aether to flow from and into.
The term antimatter was first used by Arthur Schuster in two rather whimsical letters to "Nature" in 1898, in which he coined the term. He hypothesized antiatoms, as well as whole antimatter solar systems, and discussed the possibility of matter and antimatter annihilating each other. Schuster's ideas were not a serious theoretical proposal, merely speculation, and like the previous ideas, differed from the modern concept of antimatter in that it possessed negative gravity.
The modern theory of antimatter began in 1928, with a paper by Paul Dirac. Dirac realised that his relativistic version of the Schrödinger wave equation for electrons predicted the possibility of antielectrons. Although Dirac had laid the groundwork for the existence of these “antielectrons” he initially failed to pick up on the implications contained within his own equation. He freely gave the credit for that insight to J. Robert Oppenheimer, whose seminal paper “On the Theory of Electrons and Protons” (Feb 14th 1930) drew on Dirac's equation and argued for the existence of a positively charged electron (a positron), which as a counterpart to the electron should have the same mass as the electron itself. This meant that it could not be, as Dirac had in fact suggested, a proton. Dirac further postulated the existence of antimatter in a 1931 paper which referred to the positron as an "anti-electron". These were discovered by Carl D. Anderson in 1932 and named positrons from "positive electron". Although Dirac did not himself use the term antimatter, its use follows on naturally enough from antielectrons, antiprotons, etc. A complete periodic table of antimatter was envisaged by Charles Janet in 1929.
The Feynman–Stueckelberg interpretation states that antimatter and antiparticles behave exactly identical to regular particles, but traveling backward in time. This concept is nowadays used in modern particle physics, in Feynman diagrams.
Notation.
One way to denote an antiparticle is by adding a bar over the particle's symbol. For example, the proton and antiproton are denoted as and , respectively. The same rule applies if one were to address a particle by its constituent components. A proton is made up of quarks, so an antiproton must therefore be formed from antiquarks. Another convention is to distinguish particles by positive and negative electric charge. Thus, the electron and positron are denoted simply as and respectively. To prevent confusion, however, the two conventions are never mixed.
Properties.
There is no difference in the gravitational behavior of matter and antimatter. In other words, antimatter falls down when dropped, not up. This was confirmed with the thin, very cold gas of thousands of antihydrogen atoms that were confined in a vertical shaft surrounded by superconducting electromagnetic coils. These can create a magnetic bottle to keep the antimatter from coming into contact with matter and annihilating. The researchers then gradually weakened the magnetic fields and detected the antiatoms using two sensors as they escaped and annihilated. Most of the anti-atoms came out of the bottom opening, and only one-quarter out of the top.
There are compelling theoretical reasons to believe that, aside from the fact that antiparticles have different signs on all charges (such as electric and baryon charges), matter and antimatter have exactly the same properties. This means a particle and its corresponding antiparticle must have identical masses and decay lifetimes (if unstable). It also implies that, for example, a star made up of antimatter (an "antistar") will shine just like an ordinary star. This idea was tested experimentally in 2016 by the ALPHA experiment, which measured the transition between the two lowest energy states of antihydrogen. The results, which are identical to that of hydrogen, confirmed the validity of quantum mechanics for antimatter.
Origin and asymmetry.
Most things observable from the Earth seem to be made of matter rather than antimatter. If antimatter-dominated regions of space existed, the gamma rays produced in annihilation reactions along the boundary between matter and antimatter regions would be detectable.
Antiparticles are created everywhere in the universe where high-energy particle collisions take place. High-energy cosmic rays striking Earth's atmosphere (or any other matter in the Solar System) produce minute quantities of antiparticles in the resulting particle jets, which are immediately annihilated by contact with nearby matter. They may similarly be produced in regions like the center of the Milky Way and other galaxies, where very energetic celestial events occur (principally the interaction of relativistic jets with the interstellar medium). The presence of the resulting antimatter is detectable by the two gamma rays produced every time positrons annihilate with nearby matter. The frequency and wavelength of the gamma rays indicate that each carries 511 keV of energy (that is, the rest mass of an electron multiplied by "c"2).
Observations by the European Space Agency's INTEGRAL satellite may explain the origin of a giant antimatter cloud surrounding the Galactic Center. The observations show that the cloud is asymmetrical and matches the pattern of X-ray binaries (binary star systems containing black holes or neutron stars), mostly on one side of the Galactic Center. While the mechanism is not fully understood, it is likely to involve the production of electron–positron pairs, as ordinary matter gains kinetic energy while falling into a stellar remnant.
Antimatter may exist in relatively large amounts in far-away galaxies due to cosmic inflation in the primordial time of the universe. Antimatter galaxies, if they exist, are expected to have the same chemistry and absorption and emission spectra as normal-matter galaxies, and their astronomical objects would be observationally identical, making them difficult to distinguish. NASA is trying to determine if such galaxies exist by looking for X-ray and gamma ray signatures of annihilation events in colliding superclusters.
In October 2017, scientists working on the BASE experiment at CERN reported a measurement of the antiproton magnetic moment to a precision of 1.5 parts per billion. It is consistent with the most precise measurement of the proton magnetic moment (also made by BASE in 2014), which supports the hypothesis of CPT symmetry. This measurement represents the first time that a property of antimatter is known more precisely than the equivalent property in matter.
Antimatter quantum interferometry has been first demonstrated in 2018 in the Positron Laboratory (L-NESS) of Rafael Ferragut in Como (Italy), by a group led by Marco Giammarchi.
Natural production.
Positrons are produced naturally in β+ decays of naturally occurring radioactive isotopes (for example, potassium-40) and in interactions of gamma quanta (emitted by radioactive nuclei) with matter. Antineutrinos are another kind of antiparticle created by natural radioactivity (β− decay). Many different kinds of antiparticles are also produced by (and contained in) cosmic rays. In January 2011, research by the American Astronomical Society discovered antimatter (positrons) originating above thunderstorm clouds; positrons are produced in terrestrial gamma ray flashes created by electrons accelerated by strong electric fields in the clouds. Antiprotons have also been found to exist in the Van Allen Belts around the Earth by the PAMELA module.
Antiparticles are also produced in any environment with a sufficiently high temperature (mean particle energy greater than the pair production threshold). It is hypothesized that during the period of baryogenesis, when the universe was extremely hot and dense, matter and antimatter were continually produced and annihilated. The presence of remaining matter, and absence of detectable remaining antimatter, is called baryon asymmetry. The exact mechanism that produced this asymmetry during baryogenesis remains an unsolved problem. One of the necessary conditions for this asymmetry is the violation of CP symmetry, which has been experimentally observed in the weak interaction.
Recent observations indicate black holes and neutron stars produce vast amounts of positron-electron plasma via the jets.
Observation in cosmic rays.
Satellite experiments have found evidence of positrons and a few antiprotons in primary cosmic rays, amounting to less than 1% of the particles in primary cosmic rays. This antimatter cannot all have been created in the Big Bang, but is instead attributed to have been produced by cyclic processes at high energies. For instance, electron-positron pairs may be formed in pulsars, as a magnetized neutron star rotation cycle shears electron-positron pairs from the star surface. Therein the antimatter forms a wind that crashes upon the ejecta of the progenitor supernovae. This weathering takes place as "the cold, magnetized relativistic wind launched by the star hits the non-relativistically expanding ejecta, a shock wave system forms in the impact: the outer one propagates in the ejecta, while a reverse shock propagates back towards the star." The former ejection of matter in the outer shock wave and the latter production of antimatter in the reverse shock wave are steps in a space weather cycle.
Preliminary results from the presently operating Alpha Magnetic Spectrometer ("AMS-02") on board the International Space Station show that positrons in the cosmic rays arrive with no directionality, and with energies that range from 10 GeV to 250 GeV. In September, 2014, new results with almost twice as much data were presented in a talk at CERN and published in Physical Review Letters. A new measurement of positron fraction up to 500 GeV was reported, showing that positron fraction peaks at a maximum of about 16% of total electron+positron events, around an energy of 275 ± 32 GeV. At higher energies, up to 500 GeV, the ratio of positrons to electrons begins to fall again. The absolute flux of positrons also begins to fall before 500 GeV, but peaks at energies far higher than electron energies, which peak about 10 GeV. These results on interpretation have been suggested to be due to positron production in annihilation events of massive dark matter particles.
Cosmic ray antiprotons also have a much higher energy than their normal-matter counterparts (protons). They arrive at Earth with a characteristic energy maximum of 2 GeV, indicating their production in a fundamentally different process from cosmic ray protons, which on average have only one-sixth of the energy.
There is an ongoing search for larger antimatter nuclei, such as antihelium nuclei (that is, anti-alpha particles), in cosmic rays. The detection of natural antihelium could imply the existence of large antimatter structures such as an antistar. A prototype of the "AMS-02" designated "AMS-01", was flown into space aboard the on STS-91 in June 1998. By not detecting any antihelium at all, the "AMS-01" established an upper limit of 1.1×10−6 for the antihelium to helium flux ratio. AMS-02 revealed in December 2016 that it had discovered a few signals consistent with antihelium nuclei amidst several billion helium nuclei. The result remains to be verified, and , the team is trying to rule out contamination.
Artificial production.
Positrons.
Positrons were reported in November 2008 to have been generated by Lawrence Livermore National Laboratory in large numbers. A laser drove electrons through a gold target's nuclei, which caused the incoming electrons to emit energy quanta that decayed into both matter and antimatter. Positrons were detected at a higher rate and in greater density than ever previously detected in a laboratory. Previous experiments made smaller quantities of positrons using lasers and paper-thin targets; newer simulations showed that short bursts of ultra-intense lasers and millimeter-thick gold are a far more effective source.
In 2023, the production of the first electron-positron beam-plasma was reported by a collaboration led by researchers at University of Oxford working with the High-Radiation to Materials (HRMT) facility at CERN. The beam demonstrated the highest positron yield achieved so far in a laboratory setting. The experiment employed the 440 GeV proton beam, with formula_1 protons, from the Super Proton Synchrotron, and irradiated a particle converter composed of carbon and tantalum. This yielded a total formula_2 electron-positron pairs via a particle shower process. The produced pair beams have a volume that fills multiple Debye spheres and are thus able to sustain collective plasma oscillations.
Antiprotons, antineutrons, and antinuclei.
The existence of the antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquarks and one down antiquark (). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception of the antiproton having opposite electric charge and magnetic moment from the proton. Shortly afterwards, in 1956, the antineutron was discovered in proton–proton collisions at the Bevatron (Lawrence Berkeley National Laboratory) by Bruce Cork and colleagues.
In addition to antibaryons, anti-nuclei consisting of multiple bound antiprotons and antineutrons have been created. These are typically produced at energies far too high to form antimatter atoms (with bound positrons in place of electrons). In 1965, a group of researchers led by Antonino Zichichi reported production of nuclei of antideuterium at the Proton Synchrotron at CERN. At roughly the same time, observations of antideuterium nuclei were reported by a group of American physicists at the Alternating Gradient Synchrotron at Brookhaven National Laboratory.
Antihydrogen atoms.
In 1995, CERN announced that it had successfully brought into existence nine hot antihydrogen atoms by implementing the SLAC/Fermilab concept during the PS210 experiment. The experiment was performed using the Low Energy Antiproton Ring (LEAR), and was led by Walter Oelert and Mario Macri. Fermilab soon confirmed the CERN findings by producing approximately 100 antihydrogen atoms at their facilities. The antihydrogen atoms created during PS210 and subsequent experiments (at both CERN and Fermilab) were extremely energetic and were not well suited to study. To resolve this hurdle, and to gain a better understanding of antihydrogen, two collaborations were formed in the late 1990s, namely, ATHENA and ATRAP.
In 1999, CERN activated the Antiproton Decelerator, a device capable of decelerating antiprotons from to – still too "hot" to produce study-effective antihydrogen, but a huge leap forward. In late 2002 the ATHENA project announced that they had created the world's first "cold" antihydrogen. The ATRAP project released similar results very shortly thereafter. The antiprotons used in these experiments were cooled by decelerating them with the Antiproton Decelerator, passing them through a thin sheet of foil, and finally capturing them in a Penning–Malmberg trap. The overall cooling process is workable, but highly inefficient; approximately 25 million antiprotons leave the Antiproton Decelerator and roughly 25,000 make it to the Penning–Malmberg trap, which is about or 0.1% of the original amount.
The antiprotons are still hot when initially trapped. To cool them further, they are mixed into an electron plasma. The electrons in this plasma cool via cyclotron radiation, and then sympathetically cool the antiprotons via Coulomb collisions. Eventually, the electrons are removed by the application of short-duration electric fields, leaving the antiprotons with energies less than . While the antiprotons are being cooled in the first trap, a small cloud of positrons is captured from radioactive sodium in a Surko-style positron accumulator. This cloud is then recaptured in a second trap near the antiprotons. Manipulations of the trap electrodes then tip the antiprotons into the positron plasma, where some combine with antiprotons to form antihydrogen. This neutral antihydrogen is unaffected by the electric and magnetic fields used to trap the charged positrons and antiprotons, and within a few microseconds the antihydrogen hits the trap walls, where it annihilates. Some hundreds of millions of antihydrogen atoms have been made in this fashion.
In 2005, ATHENA disbanded and some of the former members (along with others) formed the ALPHA Collaboration, which is also based at CERN. The ultimate goal of this endeavour is to test CPT symmetry through comparison of the atomic spectra of hydrogen and antihydrogen (see hydrogen spectral series).
Most of the sought-after high-precision tests of the properties of antihydrogen could only be performed if the antihydrogen were trapped, that is, held in place for a relatively long time. While antihydrogen atoms are electrically neutral, the spins of their component particles produce a magnetic moment. These magnetic moments can interact with an inhomogeneous magnetic field; some of the antihydrogen atoms can be attracted to a magnetic minimum. Such a minimum can be created by a combination of mirror and multipole fields. Antihydrogen can be trapped in such a magnetic minimum (minimum-B) trap; in November 2010, the ALPHA collaboration announced that they had so trapped 38 antihydrogen atoms for about a sixth of a second. This was the first time that neutral antimatter had been trapped.
On 26 April 2011, ALPHA announced that they had trapped 309 antihydrogen atoms, some for as long as 1,000 seconds (about 17 minutes). This was longer than neutral antimatter had ever been trapped before. ALPHA has used these trapped atoms to initiate research into the spectral properties of antihydrogen.
In 2016, a new antiproton decelerator and cooler called ELENA (extra low energy antiproton decelerator) was built. It takes the antiprotons from the antiproton decelerator and cools them to 90 keV, which is "cold" enough to study. This machine works by using high energy and accelerating the particles within the chamber. More than one hundred antiprotons can be captured per second, a huge improvement, but it would still take several thousand years to make a nanogram of antimatter.
The biggest limiting factor in the large-scale production of antimatter is the availability of antiprotons. Recent data released by CERN states that, when fully operational, their facilities are capable of producing ten million antiprotons per minute. Assuming a 100% conversion of antiprotons to antihydrogen, it would take 100 billion years to produce 1 gram or 1 mole of antihydrogen (approximately atoms of antihydrogen). However, CERN only produces 1% of the antimatter Fermilab does, and neither are designed to produce antimatter. According to Gerald Jackson, using technology already in use today we are capable of producing and capturing 20 grams of antimatter particles per year at a yearly cost of 670 million dollars per facility.
Antihelium.
Antihelium-3 nuclei () were first observed in the 1970s in proton–nucleus collision experiments at the Institute for High Energy Physics by Y. Prockoshkin's group (Protvino near Moscow, USSR) and later created in nucleus–nucleus collision experiments. Nucleus–nucleus collisions produce antinuclei through the coalescence of antiprotons and antineutrons created in these reactions. In 2011, the STAR detector reported the observation of artificially created antihelium-4 nuclei (anti-alpha particles) () from such collisions.
The Alpha Magnetic Spectrometer on the International Space Station has, as of 2021, recorded eight events that seem to indicate the detection of antihelium-3.
Preservation.
Antimatter cannot be stored in a container made of ordinary matter because antimatter reacts with any matter it touches, annihilating itself and an equal amount of the container. Antimatter in the form of charged particles can be contained by a combination of electric and magnetic fields, in a device called a Penning trap. This device cannot, however, contain antimatter that consists of uncharged particles, for which atomic traps are used. In particular, such a trap may use the dipole moment (electric or magnetic) of the trapped particles. At high vacuum, the matter or antimatter particles can be trapped and cooled with slightly off-resonant laser radiation using a magneto-optical trap or magnetic trap. Small particles can also be suspended with optical tweezers, using a highly focused laser beam.
In 2011, CERN scientists were able to preserve antihydrogen for approximately 17 minutes. The record for storing antiparticles is currently held by the TRAP experiment at CERN: antiprotons were kept in a Penning trap for 405 days. A proposal was made in 2018 to develop containment technology advanced enough to contain a billion anti-protons in a portable device to be driven to another lab for further experimentation.
Cost.
Scientists claim that antimatter is the costliest material to make. In 2006, Gerald Smith estimated $250 million could produce 10 milligrams of positrons (equivalent to $25 billion per gram); in 1999, NASA gave a figure of $62.5 trillion per gram of antihydrogen. This is because production is difficult (only very few antiprotons are produced in reactions in particle accelerators) and because there is higher demand for other uses of particle accelerators. According to CERN, it has cost a few hundred million Swiss francs to produce about 1 billionth of a gram (the amount used so far for particle/antiparticle collisions). In comparison, to produce the first atomic weapon, the cost of the Manhattan Project was estimated at $23 billion with inflation during 2007.
Several studies funded by NASA Innovative Advanced Concepts are exploring whether it might be possible to use magnetic scoops to collect the antimatter that occurs naturally in the Van Allen belt of the Earth, and ultimately the belts of gas giants like Jupiter, ideally at a lower cost per gram.
Uses.
Medical.
Matter–antimatter reactions have practical applications in medical imaging, such as positron emission tomography (PET). In positive beta decay, a nuclide loses surplus positive charge by emitting a positron (in the same event, a proton becomes a neutron, and a neutrino is also emitted). Nuclides with surplus positive charge are easily made in a cyclotron and are widely generated for medical use. Antiprotons have also been shown within laboratory experiments to have the potential to treat certain cancers, in a similar method currently used for ion (proton) therapy.
Fuel.
Isolated and stored antimatter could be used as a fuel for interplanetary or interstellar travel as part of an antimatter-catalyzed nuclear pulse propulsion or another antimatter rocket. Since the energy density of antimatter is higher than that of conventional fuels, an antimatter-fueled spacecraft would have a higher thrust-to-weight ratio than a conventional spacecraft.
If matter–antimatter collisions resulted only in photon emission, the entire rest mass of the particles would be converted to kinetic energy. The energy per unit mass () is about 10 orders of magnitude greater than chemical energies, and about 3 orders of magnitude greater than the nuclear potential energy that can be liberated, today, using nuclear fission (about per fission reaction or ), and about 2 orders of magnitude greater than the best possible results expected from fusion (about for the proton–proton chain). The reaction of of antimatter with of matter would produce (180 petajoules) of energy (by the mass–energy equivalence formula, ), or the rough equivalent of 43 megatons of TNT – slightly less than the yield of the 27,000 kg Tsar Bomba, the largest thermonuclear weapon ever detonated.
Not all of that energy can be utilized by any realistic propulsion technology because of the nature of the annihilation products. While electron–positron reactions result in gamma ray photons, these are difficult to direct and use for thrust. In reactions between protons and antiprotons, their energy is converted largely into relativistic neutral and charged pions. The neutral pions decay almost immediately (with a lifetime of 85 attoseconds) into high-energy photons, but the charged pions decay more slowly (with a lifetime of 26 nanoseconds) and can be deflected magnetically to produce thrust.
Charged pions ultimately decay into a combination of neutrinos (carrying about 22% of the energy of the charged pions) and unstable charged muons (carrying about 78% of the charged pion energy), with the muons then decaying into a combination of electrons, positrons and neutrinos (cf. muon decay; the neutrinos from this decay carry about 2/3 of the energy of the muons, meaning that from the original charged pions, the total fraction of their energy converted to neutrinos by one route or another would be about ).
Weapons.
Antimatter has been considered as a trigger mechanism for nuclear weapons. A major obstacle is the difficulty of producing antimatter in large enough quantities, and there is no evidence that it will ever be feasible. Nonetheless, the U.S. Air Force funded studies of the physics of antimatter in the Cold War, and began considering its possible use in weapons, not just as a trigger, but as the explosive itself.
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Casa Batlló
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() is a building in the center of Barcelona, Spain. It was designed by Antoni Gaudí, and is considered one of his masterpieces. A remodel of a previously built house, it was redesigned in 1904 by Gaudí (but the actual construction works hadn't begun at this point) and has been refurbished several times since. Gaudí's assistants Domènec Sugrañes i Gras, Josep Canaleta and Joan Rubió also contributed to the renovation project.
The local name for the building is "" (House of Bones), as it has a visceral, skeletal organic quality. It is located on the in the Eixample district, and forms part of a row of houses known as the (or , the "Block of Discord"), which consists of four buildings by noted architects of Barcelona.
Like everything Gaudí designed, is only identifiable as in the broadest sense. The ground floor, in particular, has unusual tracery, irregular oval windows and flowing sculpted stone work. There are few straight lines, and much of the façade is decorated with a colorful mosaic made of broken ceramic tiles (). The roof is arched and was likened to the back of a dragon or dinosaur. A common theory about the building is that the rounded feature to the left of centre, terminating at the top in a turret and cross, represents the lance of Saint George (patron saint of Catalonia, Gaudí's home), which has been plunged into the back of the dragon.
In 2005, became an UNESCO World Heritage Site.
History.
Initial construction (1877).
The building that is now was built in 1877, commissioned by Lluís Sala Sánchez. It was a classical building without remarkable characteristics within the eclecticism traditional by the end of the 19th century. The building had a basement, a ground floor, four other floors and a garden in the back.
Batlló family.
The house was bought by Josep Batlló in 1903. The design of the house made the home undesirable to buyers but the Batlló family decided to buy the place due to its centralized location. It is located in the middle of , which in the early 20th century was known as a very prestigious and fashionable area. It was an area where the prestigious family could draw attention to themselves.
In 1906, Josep Batlló still owned the home. The Batlló family was very well known in Barcelona for its contribution to the textile industry in the city. Josep Batlló i Casanovas was a textile industrialist who owned a few factories in the city. Batlló married Amàlia Godó Belaunzarán, from the family that founded the newspaper "La Vanguardia". Josep wanted an architect that would design a house that was like no other and stood out as being audacious and creative. Both Josep and his wife were open to anything and they decided not to limit Gaudí. Josep did not want his house to resemble any of the houses of the rest of the Batlló family, such as Casa Pía, built by the Josep Vilaseca. He chose the architect who had designed Park Güell because he wanted him to come up with a risky plan. The family lived on the principal floor of until the middle of the 1950s.
Renovation (1904-1906).
In 1904, Josep Batlló hired Gaudí to design his home; at first his plans were to tear down the building and construct a completely new house. Gaudí convinced Josep that a renovation was sufficient and was also able to submit the planning application the same year. The building was completed and refurbished in 1906. He completely changed the main apartment which became the residence for the Batlló family. He expanded the central well in order to supply light to the whole building and also added new floors. In the same year the Barcelona City Council selected the house as a candidate for that year's best building award. The award was given to another architect that year despite Gaudí's design.
Refurbishments.
Josep Batlló died in 1934 and the house was kept in order by the wife until her death in 1940. After the death of the two parents, the house was kept and managed by the children until 1954. In 1954, an insurance company named Seguros Iberia acquired Casa Batlló and set up offices there. In 1970, the first refurbishment occurred mainly in several of the interior rooms of the house. In 1983, the exterior balconies were restored to their original colour and a year later the exterior façade was illuminated in the ceremony of La Mercè.
Multiple uses.
In 1993, the current owners of Casa Batlló bought the home and continued refurbishments throughout the whole building. Two years later, in 1995, Casa Batlló began to hire out its facilities for different events. More than 2,500 square meters of rooms within the building were rented out for many different functions. Due to the building's location and the beauty of the facilities being rented, the rooms of Casa Batlló were in very high demand and hosted many important events for the city.
Design.
Overview.
The local name for the building is "Casa dels ossos" (House of Bones), as it has a visceral, skeletal organic quality. The building looks very remarkable — like everything Gaudí designed, only identifiable as Modernisme or Art Nouveau in the broadest sense. The ground floor, in particular, is rather astonishing with tracery, irregular oval windows and flowing sculpted stone work.
It seems that the goal of the designer was to avoid straight lines completely. Much of the façade is decorated with a mosaic made of broken ceramic tiles (trencadís) that starts in shades of golden orange moving into greenish blues. The roof is arched and was likened to the back of a dragon or dinosaur. A common theory about the building is that the rounded feature to the left of centre, terminating at the top in a turret and cross, represents the lance of Saint George (patron saint of Catalonia, Gaudí's home), which has been plunged into the back of the dragon.
Loft.
The loft is considered to be one of the most unusual spaces. It was formerly a service area for the tenants of the different apartments in the building which contained laundry rooms and storage areas. It is known for its simplicity of shapes and its Mediterranean influence through the use of white on the walls. It contains a series of sixty catenary arches that creates a space which represents the ribcage of an animal. Some people believe that the “ribcage” design of the arches is a ribcage for the dragon's spine that is represented in the roof.
The Atrium (light well).
The Atrium or the light well is in the central part of the house and delivers air and lighting to all corners of the house. Gaudí had an obsession with light and how it reflected off certain surfaces. The wall of the atrium has different tones of blue as well as a diamond textile pattern all around the walls. The blue tiles allow an equal distribution of light to all the floors. The well has windows with wooden splits to allow them to be open and closed for ventilation. Gaudí wanted to make the bottom of the well feel like the bottom of the sea. The skylight allows light to come in and reflect off the ceramic tiles into the windows to naturally illuminate the house. The blue tiles are more intensely colored at the top and get opaquer towards the bottom. The diamond textiles match the rest of the house's use of different, functional shapes.
Noble floor and museum.
The noble floor is larger than seven-hundred square meters. It is the main floor of the building. The noble floor is accessed through a private entrance hall that uses skylights resembling tortoise shells and vaulted walls in curving shapes. On the noble floor there is a spacious landing with direct views of the blue tiling of the building well. On the Passeig de Gracia side is Batlló's study, a dining room, and a secluded spot for courting couples, decorated with a mushroom-shaped fireplace. The elaborate and animal-like décor continues throughout the whole noble floor.
In 2002, as part of the celebration of the International Year of Gaudí, the house opened its doors to the public and people were allowed to visit the noble floor. Casa Batlló met with great unanticipated success, and visitors became eager to see the rest of the house. Two years later, in celebration of the one hundredth anniversary of the beginning of work on Casa Batlló, the fifth floor was restored and the house extended its visit to the loft and the well. In 2005, Casa Batlló became a UNESCO World Heritage Site.
Roof.
The roof terrace is one of the most popular features of the entire house due to its famous dragon back design. Gaudí represents an animal's spine by using tiles of different colors on one side. The roof is decorated with four chimney stacks designed to prevent backdraughts.
Exterior façade.
The façade has three distinct sections which are harmoniously integrated. The lower ground floor with the main floor and two first-floor galleries are contained in a structure of Montjuïc sandstone with undulating lines. The central part, which reaches the last floor, is a multicolored section with protruding balconies. The top of the building is a crown, like a huge gable, which is at the same level as the roof and helps to conceal the room where there used to be water tanks. This room is currently empty. The top displays a trim with ceramic pieces that has attracted multiple interpretations.
Roof tile.
The roof's arched profile recalls the spine of a dragon with ceramic tiles for scales, and a small triangular window towards the right of the structure simulates the eye. Legend has it that it was once possible to see the Sagrada Família through this window, which was being built simultaneously. As of 2022, the partial view of the Sagrada Família is available from this vantage point, with its spires visible over newer buildings. The tiles were given a metallic sheen to simulate the varying scales of the monster, with the color grading from green on the right side, where the head begins, to deep blue and violet in the center, to red and pink on the left side of the building.
Tower and bulb.
One of the highlights of the façade is a tower topped with a cross of four arms oriented to the cardinal directions. It is a bulbous, root-like structure that evokes plant life. There is a second bulb-shaped structure similarly reminiscent of a thalamus flower, which is represented by a cross with arms that are actually buds announcing the next flowering. The tower is decorated with monograms of Jesus (JHS), Maria (M with the ducal crown) and Joseph (JHP), made of ceramic pieces that stand out golden on the green background that covers the façade. These symbols show the deep religiosity of Gaudí, who was inspired by the contemporaneous construction of his basilica to choose the theme of the holy family.
The bulb was broken when it was delivered, perhaps during transportation. Although the manufacturer committed to re-do the broken parts, Gaudí liked the aesthetic of the broken masonry and asked that the pieces be stuck to the main structure with lime mortar and held in with a brass ring.
Central section.
The central part of the façade evokes the surface of a lake with water lilies, reminiscent of Monet's "Nymphéas", with gentle ripples and reflections caused by the glass and ceramic mosaic. It is a great undulating surface covered with plaster fragments of colored glass discs combined with 330 rounds of polychrome pottery. The discs were designed by Gaudí and Jujol between tests during their stay in Majorca, while working on the restoration of the Cathedral of Palma.
Balcony.
Finally, above the central part of the façade is a smaller balcony, also iron, with a different exterior aesthetic, closer to a local type of lily. Two iron arms were installed here to support a pulley to raise and lower furniture.
Main floor.
The façade of the main floor, made entirely in sandstone, and is supported by two columns. The design is complemented by joinery windows set with multicolored stained glass. In front of the large windows, as if they were pillars that support the complex stone structure, there are six fine columns that seem to simulate the bones of a limb, with an apparent central articulation; in fact, this is a floral decoration. The rounded shapes of the gaps and the lip-like edges carved into the stone surrounding them create a semblance of a fully open mouth, for which the Casa Batlló has been nicknamed the "house of yawns". The structure repeats on the first floor and in the design of two windows at the ends forming galleries, but on the large central window there are two balconies as described above.
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Park Güell
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Park Güell ( ; ) is a complex of parks and gardens in Barcelona with architectural elements, located in the La Salut neighborhood of the Gràcia district in Barcelona, Catalonia, Spain. It is situated on the southern slope of the Turó del Carmel hill, part of the Collserola mountain range, overlooking the city. The separate Parc del Carmel lies on the northern side of the same hill.
In the context of Barcelona's late 19th and early 20th-century urban expansion, Catalan industrialist and art patron Eusebi Güell commissioned architect Antoni Gaudí, a leading figure of the aesthetic movement in Catalan modernism, to design a park.
Construction took place between 1900 and 1914, and the park officially opened to the public in 1926. In 1984, UNESCO designated the park a World Heritage Site, recognizing it as part of the "Works of Antoni Gaudí" collection.
Description.
Park Güell reflects Gaudí's distinctive artistic sensibilities and visual language, marking a specific phase in his development—his naturalist period in the first decade of the 20th century. During this time, Gaudí’s study of nature and organic forms led to innovative structural solutions based on geometric analysis.
These geometric insights gave rise to his imaginative and ornamental style. Rooted in Baroque, Gaudí’s work exhibits structural richness and freedom from the rigidity of classical norms. In Park Güell, he introduced curved and undulating benches—a precursor to the style fully realized in the Sagrada Família.
Originally, Güell and Gaudí envisioned the site as a private residential development of luxurious homes with modern amenities. The park's common spaces—stairways, terraces, gardens—were designed to embody the political and religious ideals of its creators. Symbolic references include political Catalanism (e.g., on the entrance stairway), and Catholicism (e.g., the Monumento al Calvario, initially conceived as a chapel). Classical elements and Greek mythology references are also present.
Origins as a housing development.
The park was originally part of a failed housing development by Count Eusebi Güell, inspired by the English garden city movement. The name "Park" reflects this English influence. The location, a rocky hill called "Muntanya Pelada" (Bare Mountain), contained a large house known as Larrard House. Bordering the upscale La Salut neighborhood, Güell sought to market the area for its clean air and views. The plan included sixty triangular plots for luxury homes. Güell moved into Larrard House in 1906 to promote the project, but only two homes were ever built—neither by Gaudí.
One house, built as a show home in 1904, remained unsold. Güell persuaded Gaudí to purchase it with his savings. Gaudí moved in with his father and niece in 1906. The house, designed by Francesc Berenguer i Mestres, became the Gaudí House Museum in 1963 and was declared a national monument in 1969.
Municipal garden.
Park Güell eventually became a municipal garden. It is reachable by the Barcelona Metro, with Vallcarca and Lesseps being closest but not adjacent. Buses and tour buses also serve the park. Since October 2013, entry to the Monumental Zone (main terrace, mosaics, viaducts, and gate area) requires a ticket, while Barcelona residents enter for free. Tickets often sell out. Entry to Gaudí’s house (La Torre Rosa) is separate, with a discount available for visitors of the Sagrada Família.
The entrance is marked by two whimsical gatehouses forming the Porter's Lodge pavilion. One housed a phone booth; the other now contains a permanent exhibit of the Barcelona City History Museum.
The park's focal point is a terrace bordered by a long, curving bench shaped like a sea serpent. Designed by Josep Maria Jujol, the bench’s ergonomic form creates enclaves to encourage social interaction.
A system of elevated pathways—originally intended for carriages—threads through the park. Designed by Gaudí using local stone, they blend seamlessly with the landscape. Their columns and vaulted supports mimic tree trunks and natural forms. As with his earlier work at Colònia Güell, Gaudí used inverted catenary arches to achieve optimal load-bearing compression.
At the park’s highest point is a hill with steps leading to \"El Turó de les Tres Creus\" (\"Hill of the Three Crosses\")—a calvary of three stone crosses. One points skyward; the other two mark cardinal directions. From here, visitors can view the Sagrada Família, Torre Glòries, Montjuïc, and the Mediterranean.
Park Güell supports a diverse range of wildlife, including non-native parrots and sightings of the short-toed eagle. It is also known for hummingbird hawk moths.
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Casa Milà
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Casa Milà (, ), popularly known as "La Pedrera" (, ; "the stone quarry") in reference to its unconventional rough-hewn appearance, is a "Modernista" building in Barcelona, Catalonia, Spain. It was the last private residence designed by architect Antoni Gaudí and was built between 1906 and 1912.
The building was commissioned in 1906 by and his wife . At the time, it was controversial because of its undulating stone facade, twisting wrought iron balconies, and design by Josep Maria Jujol. Several structural innovations include a self-supporting stone façade, and a free-plan floor, underground garage and the spectacular terrace on the roof.
In 1984, it was declared a World Heritage Site by UNESCO. Since 2013 it has been the headquarters of the Fundació Catalunya La Pedrera, which manages visits to the building, exhibitions and other cultural and educational activities at Casa Milà.
Building history.
Architect.
Antoni Gaudí i Cornet was born on June 25, 1852, in Catalonia, Spain. As a child, Gaudí's health was poor, suffering from rheumatism. Because of this, he was afforded lengthy periods of time resting at his summer house in Riudoms. Here he spent a large portion of his time outdoors, allowing him to deeply study nature. This would become one of the major influences in his architecture to come.
Gaudí was a very practical man and a craftsman at his core. In his work he followed impulses and turned creative plans into reality. His openness to embrace new styles combined with a vivid imagination helped mold new styles of architecture and consequently helped push the limits of construction. Today he is regarded as a pioneer of the modern architecture style.
In 1870, Gaudí moved to Barcelona to study architecture. He was an inconsistent student who showed flashes of brilliance. It took him eight years to graduate due to a mix of health complications, military service as well as other activities.
After completion of his education he became a prolific architect as well as designing gardens, sculptures and all other decorative arts. Gaudí's most famous works consisted of several buildings: Parque Güell; Palacio Güell; Casa Mila; Casa Vicens. He also is attributed for his work on the Crypt of La Sagrada Familia and the Nativity facade. Gaudí's work at the time was both admired and criticized for his bold, innovative solutions.
Gaudí was injured on June 7, 1926, when he was run over by a tram. He later died in the hospital due to his injuries on June 10, 1926, at the age of 73. A few years after his death, his fame became renowned by critics and the general public alike.
Building owners.
Casa Milà was built for Roser Segimón and her husband Pere Milà. Roser Segimón was the wealthy widow of Josep Guardiola, an "Indiano" or "Americano", or former colonist returned from the Americas, who had made his fortune with a coffee plantation in Guatemala. Her second husband, Pere Milà, was a developer known for his flamboyant lifestyle.
Construction process.
In 1905, Milà and Segimón married and on June 9, Roser Segimón bought a house with garden which occupied an area of 1,835 square meters, located on Paseo de Gracia, 92. In September, they commissioned Gaudí for building them a new house with the idea of living in the main floor and renting out the rest of the apartments. On February 2, 1906, the project was presented to the Barcelona City Council and the works began, demolishing the pre-existing building instead of reforming it, as in the case of the Casa Batlló.
The building was completed in December 1910 and the owner asked Gaudí to make a certificate to inhabit the main floor, which the City Council authorized in October 1911, and the couple moved in. On October 31, 1912, Gaudí issued the certificate stating that, in accordance with his plans and his direction, the work had been completed and the whole house was ready to be rented.
Critics and controversies.
The building did not respect any rules of conventional style, for which Gaudí received much criticism. To begin with, the name "La Pedrera" is in fact a nickname assigned by the citizens who disapproved of its unusualness. The unique structure of the building and the relationship between the building's architect and Pere Milà became the object of ridicule for the people of Barcelona and many humorous publications of the time.
Catholic symbols.
Gaudí, a Catholic and a devotee of the Virgin Mary, planned for the Casa Milà to be a spiritual symbol. Overt religious elements include an excerpt from the Rosary on the cornice and planned statues of Mary, specifically Our Lady of the Rosary, and two archangels, St. Michael and St. Gabriel.
However, the Casa Milà was not built entirely to Gaudí's specifications. The local government ordered the demolition of elements that exceeded the height standard for the city, and fined the Milàs for many infractions of building codes. After Semana Trágica, an outbreak of anticlericalism in the city, Milà prudently decided to forgo the religious statues. Gaudí contemplated abandoning the project but a priest persuaded him to continue.
Change of ownership.
In 1940, Milà died. Segimon sold the property in 1946 for 18 million pesetas to Josep Ballvé i Pellisé, known for his department stores on , in partnership with the family of Pío Rubert Laporta. The Compañía Inmobiliaria Provenza, SA (CIPSA) was founded to administer the building. Roser Segimon continued to live on the main floor until her death in 1964.
The new owners divided the first floor facing into five apartments instead of the original two. In 1953, they commissioned to convert 13 rubbish-filled attic laundry rooms to street-facing apartments, leaving a communal hallway on the side facing the courtyards. Some of these two or three room apartments had a loft and were designed and furnished in a typical early 1950s style using brick, ceramic and wood. Items of furniture, such as the , were reminiscent of Eero Saarinen's work.
The insurance company Northern took over the main floor in 1966. By then, Casa Milà had housed a bingo hall, an academy and the offices of Cementos Molins and Inoxcrom among others. Maintenance costs were high and the owners had allowed the building to become dilapidated, causing stones to loosen in 1971. Josep Anton Comas made some emergency repairs, especially to the paintings in the courtyards, while respecting the original design.
Restoration.
Gaudí's work was designated a historic and artistic monument on July 24, 1969. Casa Milà was in poor condition in the early 1980s. It had been painted a dreary brown and many of its interior color schemes had been abandoned or allowed to deteriorate, but it has been restored since including restoring many of the original colors.
In 1984, the building became part of a World Heritage Site encompassing some of Gaudí's works. The Barcelonan city council tried to rent the main floor as an office for the 1992 Olympic bid. Finally, the day before Christmas 1986, Caixa Catalunya bought La Pedrera for 900 million pesetas. On February 19, 1987, urgently needed work began on the restoration and cleaning of the façade. The work was done by the architects Joseph Emilio Hernández-Cros and Rafael Vila. The renovated main floor opened in 1990 as part of the Cultural Olympiad of Barcelona. The floor became an exhibition room with an example of modernism in the Eixample.
Design.
The building is 1,323 m2 per floor on a plot of 1,620 m2. Gaudí made the first sketches in his workshop in the Sagrada Família. He designed the house as a constant curve, both outside and inside, incorporating ruled geometry and naturalistic elements.
Casa Milà consists of two buildings, which are structured around two courtyards that provide light to the nine stories: basement, ground floor, mezzanine, main (or noble) floor, four upper floors, and an attic. The basement was intended to be the garage, the main floor the residence of the Milàs (a flat of all 1,323 m2), and the rest distributed over 20 apartments. The resulting layout is shaped like an asymmetrical "8" because of the different shapes and sizes of the courtyards. The attic housed the laundry and drying areas, forming an insulating space for the building and simultaneously determining the levels of the roof.
One of the most notable elements of the building is the roof, crowned with skylights, staircase exits, fans, and chimneys. All of these elements, constructed out of brick covered with lime, broken marble, or glass have a specific architectural function but are also real sculptures integrated into the building.
The apartments feature plastered ceilings with dynamic reliefs, handcrafted wooden doors, windows, and furniture, as well as hydraulic tiles and various ornamental elements.
The stairways were intended as service entries, with the main access to the apartments by elevator except for the noble floor, where Gaudí added a prominent interior staircase. Gaudí wanted the people who lived in the flats to all know each other. Therefore, there were only elevators on every other floor, so people on different floors would meet one another.
Structure.
Casa Milà is characterized by its self-supporting stone facade, meaning that it is free of load-bearing walls. The facade connects to the internal structure of each floor by means of curved iron beams surrounding the perimeter of each floor. This construction system allows, on one hand, large openings in the facade which give light to the homes, and on the other, free structuring of the different levels, so that internal walls can be added and demolished without affecting the stability of the building. This allows the owners to change their minds at will and to modify, without problems, the interior layout of the homes.
Constructive and decorative items.
Facade.
The facade is composed of large blocks of limestone from the Garraf Massif on the first floor and from the Villefranche quarry for the higher levels. The blocks were cut to follow the plot of the projection of the model, then raised to their location and adjusted to align in a continuous curve to the pieces around them.
The windows of La Pedrera are an integral part of the overall facade design. Gaudí made sure that the windows were of varying sizes, designed to optimize the amount of natural light that could enter the building.
Viewed from the outside the building has three parts: the main body of the six-storey blocks with winding stone floors, two floors set a block back with a different curve, similar to waves, a smoother texture and whiter color, and with small holes that look like embrasures, and finally the body of the roof.
Gaudí's original facade had some of its lower-level ironwork removed. In 1928, the tailor Mosella opened the first store in La Pedrera, and he eliminated the bars. This did not concern anyone, because in the middle of twentieth century, wrought ironwork had little importance. The ironwork was lost until a few years later, when Americans donated one of them to the MoMa, where it is on display.
With restoration initiatives launched in 1987, the facade was rejoined to some pieces of stone that had fallen. In order to respect the fidelity of the original, material was obtained from the Villefranche quarry, even though by then it was no longer operating.
Hall and courtyards.
The building uses a completely original solution to solve the issue of a lobby being too closed and dark. Its open and airy courtyards provide a place of transit and are directly visible to those accessing the building. There are two patios on the side of the Passeig de Gracia and of the street Provence.
Patios, structurally, are key as supporting loads of interior facades. The floor of the courtyard is supported by pillars of cast iron. In the courtyard, there are traditional elliptical beams and girders but Gaudí applied an ingenious solution of using two concentric cylindrical beams with stretched radial beams, like the spokes of a bicycle. They form a point outside of the beam to two points above and below, making the function of the central girder a keystone and working in tension and compression simultaneously. This supported structure is twelve feet in diameter and is considered "the soul of the building" with a clear resemblance to Gothic crypts. The centerpiece was built in a shipyard by Josep Maria Carandell who copied a steering wheel, interpreting Gaudí's intent as to represent the helm of the ship of life.
Access is protected by a massive iron gate with a design attributed to Jujol. It was originally used by both people and cars, as access to the garage is in the basement, now an auditorium.
The two halls are fully polychrome with oil paintings on the plaster surfaces, with eclectic references to mythology and flowers.
During construction there was a problem including a basement as a garage for cars, the new invention that was thrilling the bourgeois at the time. The future neighbor Felix Anthony Meadows, owner of Industrial Linera, requested a change because his Rolls-Royce could not access it. Gaudí agreed to remove a pillar on the ramp that led into the garage so that Felix, who was establishing sales and factory in Parets del Vallès, could go to both places with his car from La Pedrera.
For the floors of Casa Milà, Gaudí used a model of floor forms of square timbers with two colors, and the hydraulic pavement hexagonal pieces of blue and sea motifs that had originally been designed for the Batllo house. The wax was designed in gray by John Bertrand under the supervision of Gaudí who "touched up with their own fingers," in the words of the manufacturer Josep Bay.
Loft.
Like in Casa Batlló, Gaudí shows the application of the catenary arch as a support structure for the roof, a form which he had already used shortly after graduating in the wood frameworks of Mataró's cooperative known as "L'Obrera Mataronense." In this case, Gaudí used the Catalan technique of timbrel, imported from Italy in the fourteenth century.
The attic, where the laundry rooms were located, was a clear room under a Catalan vault roof supported by 270 parabolic vaults of different heights and spaced by about 80 cm. The roof resembles both the ribs of a huge animal and a palm, giving the roof-deck a very unconventional shape similar to a landscape of hills and valleys. The shape and location of the courtyards makes the arches higher when the space is narrowed and lower when the space expands.
The builder Bayó explained its construction: "First the face of a wide wall was filled with mortar and plastered. Then Canaleta indicated the opening of each arch and Bayó put a nail at each starting point of the arch at the top of the wall. From these nails was dangled a chain so that the lowest point coincided with the deflection of the arch. Then the profile displayed on the wall by the chain was drawn and on this profile the carpenter marked and placed the corresponding centering, and the timbrel vault was started with three rows of plane bricks. Gaudí wanted to add a longitudinal axis of bricks connecting all vaults at their keystones".
Roof and chimneys.
The work of Gaudí on the rooftop of La Pedrera brought his experience at Palau Güell together with solutions that were clearly more innovative – this time creating shapes and volumes with more body, more prominence, and less polychromasia.
On the rooftop there are six skylights/staircase exits (four of which were covered with broken pottery and some that ended in a double cross typical of Gaudí), twenty-eight chimneys in several groupings, two half-hidden vents whose function is to renew the air in the building, and four domes that discharged to the facade. The staircases also house the water tanks; some of which are snail-shaped.
The stepped roof of La Pedrera, called "the garden of warriors" by the poet Pere Gimferrer because the chimneys appear to be protecting the skylights, has undergone a radical restoration, removing chimneys added in interventions after Gaudí, television antennas, and other elements that degraded the space. The restoration brought back the splendor to the chimneys and the skylights that were covered with fragments of marble and broken Valencia tiles. One of the chimneys was topped with glass pieces – it was said that Gaudí did that the day after the inauguration of the building, taking advantage of the empty bottles from the party. It was restored with the bases of champagne bottles from the early twentieth century. The repair work has enabled the restoration of the original impact of the overhangs made of stone from Ulldecona with fragments of tiles. This whole set is more colorful than the facade, although here the creamy tones are dominant.
Furniture.
Gaudí, as he had done in Casa Batlló, designed furniture specifically for the main floor. This was part of the concept artwork itself integral to modernism in which the architect assumed responsibility for global issues such as the structure and the facade, as well as every detail of the decor, designing furniture and accessories such as lamps, planters, floors or ceilings.
This was another point of friction with Segimon, who complained that there was no straight wall to place her Steinway piano. Gaudí's response was blunt: "So play the violin." The result of these disagreements has been the loss of the decorative legacy of Gaudí, as most of the furniture was removed due to climate change and the changes she made to the main floor when Gaudí died. Some remain in private collections, including a curtain made of oak 4 m. long by 1.96 m. high in the Museum of Catalan Modernism; and a chair and desktop of Milà.
Gaudí carved oak doors similar to what he had done for the Casa y Bardes, but these were only included on two floors as when Segimon discovered the price, she decided there would be no more at that quality.
Architecture.
"Casa Milà" is part of the UNESCO World Heritage Site "Works of Antoni Gaudí". It was a predecessor of some buildings with a similar biomorphic appearance:
Free exhibitions often are held on the first floor, which also provides some opportunity to see the interior design. There is a charge for entrance to the apartment on the fourth floor and the roof. The other floors are not open to visitors.
Constructive similarities.
Gaudí's La Pedrera was inspired by a mountain, but there is no agreement as to which mountain was the reference model. Joan Bergós thought it was the rocks of Fray Guerau in Prades mountains. Joan Matamala thought that the model could have been St. Miquel del Fai, while the sculptor Vicente Vilarubias believed it was inspired by the cliffs Torrent Pareis in Menorca. Other options include the mountains of Uçhisar in Cappadocia, suggested by Juan Goytisolo, or Mola Gallifa, suggested by Louis Permanyer, based on the fact that Gaudí visited the area in 1885 to escape an outbreak of cholera in Barcelona.
Some people say that the interior layout of La Pedrera comes from studies that Gaudí made of medieval fortresses. This image is reinforced by the seeming appearance of the rooftop chimneys as "sentinels" with great helmets. The structure of the iron door in the lobby does not follow any symmetry, straight or repetitive pattern. Rather, it evokes bubbles of soap that are formed between the hands or the structures of a plant cell.
Criticism and controversy.
The building's unconventional style made it the subject of much criticism. It was given the nickname "La Pedrera", meaning "the quarry". Casa Milà appeared in many satirical magazines. Joan Junceda presented it as a traditional "Easter cake" by means of cartoons in "Patufet". Joaquim Garcia made a joke about the difficulty of setting the damask wrought iron balconies in his magazine. Homeowners in Passeig de Gracia became angry with Milà and ceased to greet him, arguing that the weird building by Gaudí would lower the price of land in the area.
Administrative problems.
Casa Milà also caused some administrative problems. In December 1907 the City Hall stopped work on the building because of a pillar which occupied part of the sidewalk, not respecting the alignment of facades. Again on August 17, 1908, more problems occurred when the building surpassed the predicted height and borders of its construction site by . The Council called for a fine of 100,000 pesetas (approximately 25% of the cost of work) or for the demolition of the attic and roof. The dispute was resolved a year and a half later, December 28, 1909, when the Commission certified that it was a monumental building and thus not required to have a 'strict compliance' with the bylaws.
Design competitions.
The owner entered La Pedrera in the annual sponsored by the Barcelona City Council ("Ayuntament"). Other entries in the competition included two works by Sagnier (Calle Mallorca 264, and one on Corsica and Av. Diagonal), the by architect , and the , designed by . Although the most dramatic and clear favorite was Casa Milà, the jury opined that even though the facades were complete, "there's still a lot left to do before it's fully completed, finalized and in a perfect state of appreciation." The winner in 1910 was Samanillo Perez, for his building which now houses the headquarters of the Circulo Ecuestre.
Design disagreements.
Gaudí's relations with Segimon deteriorated during the construction and decoration of the house. There were many disagreements between them, one example being the monumental bronze virgin del Rosario, which Gaudí wanted as the statue on the front of the building in homage to the name of the owner, that the artist Carles Mani i Roig was to sculpt. The statue was not made although the words "Ave gratia M plena Dominus tecum" were written at the top of the facade. Continuing disagreements led Gaudí to take Milà to court over his fees. The lawsuit was won by Gaudí in 1916, and he gave the 105,000 pesetas he won in the case to charity, stating that "the principles mattered more than money." Milà was having to pay the mortgage.
After Gaudí's death in 1926, Segimon got rid of most of the furniture that Gaudí had designed and covered over parts of Gaudí's designs with new decorations in the style of Louis XVI. La Pedrera was acquired in 1986 by and when restoration was done four years later, some of the original decorations re-emerged.
When the Civil War broke out in July 1936, the Milàs were on vacation. Part of the building was collectivized by the Unified Socialist Party of Catalonia; the Milàs fled the area with some artwork.
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Antiparticle
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In particle physics, every type of particle of "ordinary" matter (as opposed to antimatter) is associated with an antiparticle with the same mass but with opposite physical charges (such as electric charge). For example, the antiparticle of the electron is the positron (also known as an antielectron). While the electron has a negative electric charge, the positron has a positive electric charge, and is produced naturally in certain types of radioactive decay. The opposite is also true: the antiparticle of the positron is the electron.
Some particles, such as the photon, are their own antiparticle. Otherwise, for each pair of antiparticle partners, one is designated as the normal particle (the one that occurs in matter usually interacted with in daily life). The other (usually given the prefix "anti-") is designated the "antiparticle".
Particle–antiparticle pairs can annihilate each other, producing photons; since the charges of the particle and antiparticle are opposite, total charge is conserved. For example, the positrons produced in natural radioactive decay quickly annihilate themselves with electrons, producing pairs of gamma rays, a process exploited in positron emission tomography.
The laws of nature are very nearly symmetrical with respect to particles and antiparticles. For example, an antiproton and a positron can form an antihydrogen atom, which is believed to have the same properties as a hydrogen atom. This leads to the question of why the formation of matter after the Big Bang resulted in a universe consisting almost entirely of matter, rather than being a half-and-half mixture of matter and antimatter. The discovery of charge parity violation helped to shed light on this problem by showing that this symmetry, originally thought to be perfect, was only approximate. The question about how the formation of matter after the Big Bang resulted in a universe consisting almost entirely of matter remains an unanswered one, and explanations so far are not truly satisfactory, overall.
Because charge is conserved, it is not possible to create an antiparticle without either destroying another particle of the same charge (as is for instance the case when antiparticles are produced naturally via beta decay or the collision of cosmic rays with Earth's atmosphere), or by the simultaneous creation of both a particle "and" its antiparticle (pair production), which can occur in particle accelerators such as the Large Hadron Collider at CERN.
Particles and their antiparticles have equal and opposite charges, so that an uncharged particle also gives rise to an uncharged antiparticle. In many cases, the antiparticle and the particle coincide: pairs of photons, Z0 bosons, mesons, and hypothetical gravitons and some hypothetical WIMPs all self-annihilate. However, electrically neutral particles need not be identical to their antiparticles: for example, the neutron and antineutron are distinct.
History.
Experiment.
In 1932, soon after the prediction of positrons by Paul Dirac, Carl D. Anderson found that cosmic-ray collisions produced these particles in a cloud chamber – a particle detector in which moving electrons (or positrons) leave behind trails as they move through the gas. The electric charge-to-mass ratio of a particle can be measured by observing the radius of curling of its cloud-chamber track in a magnetic field. Positrons, because of the direction that their paths curled, were at first mistaken for electrons travelling in the opposite direction. Positron paths in a cloud-chamber trace the same helical path as an electron but rotate in the opposite direction with respect to the magnetic field direction due to their having the same magnitude of charge-to-mass ratio but with opposite charge and, therefore, opposite signed charge-to-mass ratios.
The antiproton and antineutron were found by Emilio Segrè and Owen Chamberlain in 1955 at the University of California, Berkeley. Since then, the antiparticles of many other subatomic particles have been created in particle accelerator experiments. In recent years, complete atoms of antimatter have been assembled out of antiprotons and positrons, collected in electromagnetic traps.
Dirac hole theory.
Solutions of the Dirac equation contain negative energy quantum states. As a result, an electron could always radiate energy and fall into a negative energy state. Even worse, it could keep radiating infinite amounts of energy because there were infinitely many negative energy states available. To prevent this unphysical situation from happening, Dirac proposed that a "sea" of negative-energy electrons fills the universe, already occupying all of the lower-energy states so that, due to the Pauli exclusion principle, no other electron could fall into them. Sometimes, however, one of these negative-energy particles could be lifted out of this Dirac sea to become a positive-energy particle. But, when lifted out, it would leave behind a "hole" in the sea that would act exactly like a positive-energy electron with a reversed charge. These holes were interpreted as "negative-energy electrons" by Paul Dirac and mistakenly identified with protons in his 1930 paper "A Theory of Electrons and Protons" However, these "negative-energy electrons" turned out to be positrons, and not protons.
This picture implied an infinite negative charge for the universea problem of which Dirac was aware. Dirac tried to argue that we would perceive this as the normal state of zero charge. Another difficulty was the difference in masses of the electron and the proton. Dirac tried to argue that this was due to the electromagnetic interactions with the sea, until Hermann Weyl proved that hole theory was completely symmetric between negative and positive charges. Dirac also predicted a reaction + → + , where an electron and a proton annihilate to give two photons. Robert Oppenheimer and Igor Tamm, however, proved that this would cause ordinary matter to disappear too fast. A year later, in 1931, Dirac modified his theory and postulated the positron, a new particle of the same mass as the electron. The discovery of this particle the next year removed the last two objections to his theory.
Within Dirac's theory, the problem of infinite charge of the universe remains. Some bosons also have antiparticles, but since bosons do not obey the Pauli exclusion principle (only fermions do), hole theory does not work for them. A unified interpretation of antiparticles is now available in quantum field theory, which solves both these problems by describing antimatter as negative energy states of the same underlying matter field, i.e. particles moving backwards in time.
Particle–antiparticle annihilation.
If a particle and antiparticle are in the appropriate quantum states, then they can annihilate each other and produce other particles. Reactions such as + → (the two-photon annihilation of an electron-positron pair) are an example. The single-photon annihilation of an electron-positron pair, + → , cannot occur in free space because it is impossible to conserve energy and momentum together in this process. However, in the Coulomb field of a nucleus the translational invariance is broken and single-photon annihilation may occur. The reverse reaction (in free space, without an atomic nucleus) is also impossible for this reason. In quantum field theory, this process is allowed only as an intermediate quantum state for times short enough that the violation of energy conservation can be accommodated by the uncertainty principle. This opens the way for virtual pair production or annihilation in which a one particle quantum state may "fluctuate" into a two particle state and back. These processes are important in the vacuum state and renormalization of a quantum field theory. It also opens the way for neutral particle mixing through processes such as the one pictured here, which is a complicated example of mass renormalization.
Properties.
Quantum states of a particle and an antiparticle are interchanged by the combined application of charge conjugation formula_1, parity formula_2 and time reversal formula_3.
formula_1 and formula_2 are linear, unitary operators, formula_3 is antilinear and antiunitary,
formula_7.
If formula_8 denotes the quantum state of a particle formula_9 with momentum formula_10 and spin formula_11 whose component in the z-direction is formula_12, then one has
formula_13
where formula_14 denotes the charge conjugate state, that is, the antiparticle. In particular a massive particle and its antiparticle transform under the same irreducible representation of the Poincaré group which means the antiparticle has the same mass and the same spin.
If formula_15, formula_16 and formula_17
can be defined separately on the particles and antiparticles, then
formula_18
formula_19
formula_20
where the proportionality sign indicates that there might be a phase on the right hand side.
As formula_21 anticommutes with the charges, formula_22, particle and antiparticle have opposite electric charges q and -q.
"This section draws upon the ideas, language and notation of canonical quantization of a quantum field theory."
Quantum field theory.
One may try to quantize an electron field without mixing the annihilation and creation operators by writing
formula_23
where we use the symbol "k" to denote the quantum numbers "p" and σ of the previous section and the sign of the energy, "E(k)", and "ak" denotes the corresponding annihilation operators. Of course, since we are dealing with fermions, we have to have the operators satisfy canonical anti-commutation relations. However, if one now writes down the Hamiltonian
formula_24
then one sees immediately that the expectation value of "H" need not be positive. This is because "E(k)" can have any sign whatsoever, and the combination of creation and annihilation operators has expectation value 1 or 0.
So one has to introduce the charge conjugate "antiparticle" field, with its own creation and annihilation operators satisfying the relations
formula_25
where "k" has the same "p", and opposite σ and sign of the energy. Then one can rewrite the field in the form
formula_26
where the first sum is over positive energy states and the second over those of negative energy. The energy becomes
formula_27
where "E0" is an infinite negative constant. The vacuum state is defined as the state with no particle or antiparticle, "i.e.", formula_28 and formula_29. Then the energy of the vacuum is exactly "E0". Since all energies are measured relative to the vacuum, H is positive definite. Analysis of the properties of "ak" and "bk" shows that one is the annihilation operator for particles and the other for antiparticles. This is the case of a fermion.
This approach is due to Vladimir Fock, Wendell Furry and Robert Oppenheimer. If one quantizes a real scalar field, then one finds that there is only one kind of annihilation operator; therefore, real scalar fields describe neutral bosons. Since complex scalar fields admit two different kinds of annihilation operators, which are related by conjugation, such fields describe charged bosons.
Feynman–Stückelberg interpretation.
By considering the propagation of the negative energy modes of the electron field backward in time, Ernst Stückelberg reached a pictorial understanding of the fact that the particle and antiparticle have equal mass m and spin J but opposite charges q. This allowed him to rewrite perturbation theory precisely in the form of diagrams. Richard Feynman later gave an independent systematic derivation of these diagrams from a particle formalism, and they are now called Feynman diagrams. Each line of a diagram represents a particle propagating either backward or forward in time. In Feynman diagrams, anti-particles are shown traveling backwards in time relative to normal matter, and vice versa. This technique is the most widespread method of computing amplitudes in quantum field theory today.
Since this picture was first developed by Stückelberg, and acquired its modern form in Feynman's work, it is called the Feynman–Stückelberg interpretation of antiparticles to honor both scientists.
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Arabian Prince
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Kim Renard Nazel (born June 17, 1965), better known by his stage names Arabian Prince or Professor X, is an American rapper and record producer. He was a founding member of N.W.A and contributed to several tracks from "N.W.A. and the Posse" (1987) and their debut studio album "Straight Outta Compton" (1989), the latter of which was released shortly after he left the group.
Early life.
Nazel was born in Compton, California, to the son of Joseph "Skippy" Nazel Jr., an African American author and radio talk show host. His musical background came from his mother, a piano teacher and classical musician. His family tried its best to shelter him, sending him to a Catholic school and keeping him busy with football to keep him away from the gangs. The younger Nazel got his first experience with making music at the radio station his father hosted his talk show on; Nazel used the radio station's equipment to put together mixtapes that he would sell at school. Nazel went on to graduate from Junípero Serra High School in nearby Gardena.
Music career.
Nazel took the stage name of DJ Prince and started selling mixtapes at school. While working at a petshop at a Lennox California Mall, its owner, Sam Nassif, asked him to DJ a party at a community dance hall. He kept performing there for several weekends and the success persuaded Nassif to invest even more in the place, renaming it "The Cave",(And Later "The Basement") where Nazel would continue to host for over three years and even after his N.W.A days. Nassif also funded DJ Prince's first record, "Strange Life".
He changed his stage name when he was 15 years old at the Skateland USA, the same skating venue credited for launching N.W.A a few years later, due to a fan's suggestion. He said about his name:
Arabian Prince started working with Bobby Jimmy & the Critters in 1984. He also produced the hit single and album for J.J. Fad, "Supersonic".
In 1987, he was a founding member of N.W.A, helping with production on some tracks and appearing as a vocalist on "Panic Zone" from "N.W.A. and the Posse" (1987) and the last track off the group's debut studio album "Straight Outta Compton" (1989), "Something 2 Dance 2", a relatively radio-friendly song which was also removed from later pressings of the album due to a dispute. Arabian Prince left N.W.A in late 1988, shortly before the release of "Straight Outta Compton", over royalty and contract disagreements. "I started off as a solo artist", he said, "so I was aware of what a royalty statement was. I knew that when these many records were sold, there is a quarterly statement. When you look at it, you can see how much money was paid and then share it. This was not the case. We were also never paid for touring." Eazy-E, Ice Cube and MC Ren remained as the main performers, DJ Yella was the turntablist and Dr. Dre was the main producer.
After leaving N.W.A, Arabian Prince began a solo career. His first album, "Brother Arab", was released in 1989 with the single "She's Got A Big Posse"; "Where's My Bytches" followed in 1993.
In the mid-2000s, he started releasing music again, with his Professor X project on the Dutch label Clone Records. "I could not release the record under Arabian Prince", he said, "because I already had a single out, so I called myself Professor X on that record." In 2007, he performed as a DJ on the 2K Sports Holiday Bounce Tour with artists from the Stones Throw label. In 2008, Stones Throw released a compilation of his electro-rap material from the 1980s. One of his songs was included on the 2007 video game, "College Hoops 2K8".
In 2015, a biopic about N.W.A. titled "Straight Outta Compton" was released; however, Arabian Prince was not portrayed in the film. After the release film, Prince said to VladTV: "A lot of the scenes in real life, I was there—I'm just not there in the film, which I'm like, if you're gonna write me out of a movie, shoot some other scenes. Don't write scenes where I was there." Some of the pivotal scenes would be choosing the name for the band, the tour and the infamous Detroit concert. He also remembers himself as the main opposer to Jerry Heller about the royalties and the money, a role that in the film was instead given to Ice Cube.
The following year, N.W.A. was inducted into the Rock and Roll Hall of Fame, but again, Arabian Prince was not included nor mentioned.
In 2018, Arabian Prince appeared on the "AmeriKKKant" album of industrial-metal band Ministry. He made a second appearance on Ministry's 2021 album "Moral Hygiene".
Other ventures.
Aside from his music career, he worked in special effects, 3D animation and video games.
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Associative property
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In mathematics, the associative property is a property of some binary operations that rearranging the parentheses in an expression will not change the result. In propositional logic, associativity is a valid rule of replacement for expressions in logical proofs.
Within an expression containing two or more occurrences in a row of the same associative operator, the order in which the operations are performed does not matter as long as the sequence of the operands is not changed. That is (after rewriting the expression with parentheses and in infix notation if necessary), rearranging the parentheses in such an expression will not change its value. Consider the following equations:
formula_1
Even though the parentheses were rearranged on each line, the values of the expressions were not altered. Since this holds true when performing addition and multiplication on any real numbers, it can be said that "addition and multiplication of real numbers are associative operations".
Associativity is not the same as commutativity, which addresses whether the order of two operands affects the result. For example, the order does not matter in the multiplication of real numbers, that is, , so we say that the multiplication of real numbers is a commutative operation. However, operations such as function composition and matrix multiplication are associative, but not (generally) commutative.
Associative operations are abundant in mathematics; in fact, many algebraic structures (such as semigroups and categories) explicitly require their binary operations to be associative. However, many important and interesting operations are non-associative; some examples include subtraction, exponentiation, and the vector cross product. In contrast to the theoretical properties of real numbers, the addition of floating point numbers in computer science is not associative, and the choice of how to associate an expression can have a significant effect on rounding error.
Definition.
Formally, a binary operation formula_2 on a set is called associative if it satisfies the associative law:
formula_3, for all formula_4 in .
Here, ∗ is used to replace the symbol of the operation, which may be any symbol, and even the absence of symbol (juxtaposition) as for multiplication.
formula_5, for all formula_4 in .
The associative law can also be expressed in functional notation thus: formula_7
Generalized associative law.
If a binary operation is associative, repeated application of the operation produces the same result regardless of how valid pairs of parentheses are inserted in the expression. This is called the generalized associative law.
The number of possible bracketings is just the Catalan number, formula_8
, for "n" operations on "n+1" values. For instance, a product of 3 operations on 4 elements may be written (ignoring permutations of the arguments), in formula_9 possible ways:
If the product operation is associative, the generalized associative law says that all these expressions will yield the same result. So unless the expression with omitted parentheses already has a different meaning (see below), the parentheses can be considered unnecessary and "the" product can be written unambiguously as
formula_15
As the number of elements increases, the number of possible ways to insert parentheses grows quickly, but they remain unnecessary for disambiguation.
An example where this does not work is the logical biconditional . It is associative; thus, is equivalent to , but most commonly means , which is not equivalent.
Examples.
Some examples of associative operations include the following.
Propositional logic.
Rule of replacement.
In standard truth-functional propositional logic, "association", or "associativity" are two valid rules of replacement. The rules allow one to move parentheses in logical expressions in logical proofs. The rules (using logical connectives notation) are:
formula_16
and
formula_17
where "formula_18" is a metalogical symbol representing "can be replaced in a proof with".
Truth functional connectives.
"Associativity" is a property of some logical connectives of truth-functional propositional logic. The following logical equivalences demonstrate that associativity is a property of particular connectives. The following (and their converses, since is commutative) are truth-functional tautologies.
formula_19
formula_20
formula_21
Joint denial is an example of a truth functional connective that is "not" associative.
Non-associative operation.
A binary operation formula_22 on a set "S" that does not satisfy the associative law is called non-associative. Symbolically,
formula_23
For such an operation the order of evaluation "does" matter. For example:
formula_24
formula_25
formula_26
formula_27
Also although addition is associative for finite sums, it is not associative inside infinite sums (series). For example,
formula_28
whereas
formula_29
Some non-associative operations are fundamental in mathematics. They appear often as the multiplication in structures called non-associative algebras, which have also an addition and a scalar multiplication. Examples are the octonions and Lie algebras. In Lie algebras, the multiplication satisfies Jacobi identity instead of the associative law; this allows abstracting the algebraic nature of infinitesimal transformations.
Other examples are quasigroup, quasifield, non-associative ring, and commutative non-associative magmas.
Nonassociativity of floating point calculation.
In mathematics, addition and multiplication of real numbers are associative. By contrast, in computer science, addition and multiplication of floating point numbers are "not" associative, as different rounding errors may be introduced when dissimilar-sized values are joined in a different order.
To illustrate this, consider a floating point representation with a 4-bit significand:
Even though most computers compute with 24 or 53 bits of significand, this is still an important source of rounding error, and approaches such as the Kahan summation algorithm are ways to minimise the errors. It can be especially problematic in parallel computing.
Notation for non-associative operations.
In general, parentheses must be used to indicate the order of evaluation if a non-associative operation appears more than once in an expression (unless the notation specifies the order in another way, like formula_30). However, mathematicians agree on a particular order of evaluation for several common non-associative operations. This is simply a notational convention to avoid parentheses.
A left-associative operation is a non-associative operation that is conventionally evaluated from left to right, i.e.,
formula_31
while a right-associative operation is conventionally evaluated from right to left:
formula_32
Both left-associative and right-associative operations occur. Left-associative operations include the following:
formula_33
formula_34
formula_35
This notation can be motivated by the currying isomorphism, which enables partial application.
Right-associative operations include the following:
formula_36Exponentiation is commonly used with brackets or right-associatively because a repeated left-associative exponentiation operation is of little use. Repeated powers would mostly be rewritten with multiplication:
formula_37Formatted correctly, the superscript inherently behaves as a set of parentheses; e.g. in the expression formula_38 the addition is performed before the exponentiation despite there being no explicit parentheses formula_39 wrapped around it. Thus given an expression such as formula_40, the full exponent formula_41 of the base formula_42 is evaluated first. However, in some contexts, especially in handwriting, the difference between formula_43, formula_44 and formula_36 can be hard to see. In such a case, right-associativity is usually implied.
formula_46
formula_47Using right-associative notation for these operations can be motivated by the Curry–Howard correspondence and by the currying isomorphism.
Non-associative operations for which no conventional evaluation order is defined include the following.
formula_48
formula_49
formula_50
formula_51
formula_52
formula_53.(Compare material nonimplication in logic.)
History.
William Rowan Hamilton seems to have coined the term "associative property" around 1844, a time when he was contemplating the non-associative algebra of the octonions he had learned about from John T. Graves.
Relationship with commutativity in certain special cases.
In general, associative operations are not commutative. However, under certain special conditions, it may be the case that associativity implies commutativity. Associative operators defined on an interval of the real number line are commutative if they are continuous and injective in both arguments. A consequence is that every continuous, associative operator on two real inputs that is strictly increasing in each of its inputs is commutative.
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The Apache Software Foundation
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The Apache Software Foundation ( ; ASF) is an American nonprofit corporation (classified as a 501(c)(3) organization in the United States) to support a number of open-source software projects. The ASF was formed from a group of developers of the Apache HTTP Server, and incorporated on March 25, 1999. it includes approximately 1000 members.
The Apache Software Foundation is a decentralized open source community of developers. The software they produce is distributed under the terms of the Apache License, a permissive open-source license for free and open-source software (FOSS). The Apache projects are characterized by a collaborative, consensus-based development process and an open and pragmatic software license, which is to say that it allows developers, who receive the software freely, to redistribute it under non-free terms. Each project is managed by a self-selected team of technical experts who are active contributors to the project. The ASF is a meritocracy, implying that membership of the foundation is granted only to volunteers who have actively contributed to Apache projects.
Among the ASF's objectives are: to provide legal protection to volunteers working on Apache projects, and to prevent the "Apache" brand name from being used by other organizations without permission.
The ASF also holds several ApacheCon conferences each year, highlighting Apache projects and related technology.
History.
The history of the Apache Software Foundation is linked to the Apache HTTP Server, development beginning in February 1993. A group of eight developers started working on enhancing the NCSA HTTPd daemon. They came to be known as the Apache Group. On March 25, 1999, the Apache Software Foundation was formed. The first official meeting of the Apache Software Foundation was held on April 13, 1999. The initial members of the Apache Software Foundation consisted of the Apache Group: Brian Behlendorf, Ken Coar, Miguel Gonzales, Mark Cox, Lars Eilebrecht, Ralf S. Engelschall, Roy T. Fielding, Dean Gaudet, Ben Hyde, Jim Jagielski, Alexei Kosut, Martin Kraemer, Ben Laurie, Doug MacEachern, Aram Mirzadeh, Sameer Parekh, Cliff Skolnick, Marc Slemko, William (Bill) Stoddard, Paul Sutton, Randy Terbush and Dirk-Willem van Gulik. After a series of additional meetings to elect board members and resolve other legal matters regarding incorporation, the effective incorporation date of the Apache Software Foundation was set to June 1, 1999.
Co-founder Brian Behlendorf states how the name 'Apache' was chosen: "I suggested the name Apache partly because the web technologies at the time that were launching were being called cyber this or spider that or something on those themes and I was like we need something a little more interesting, a little more romantic, not to be a cultural appropriator or anything like that, I had just seen a documentary about Geronimo and the last days of a Native American tribe called the Apaches right, who succumbed to the invasion from the West, from the United States, and they were the last tribe to give up their territory and for me that almost romantically represented what I felt we were doing with this web-server project..."
Projects.
Apache divides its software development activities into separate semi-autonomous areas called "top-level projects" (formally known as a "Project Management Committee" in the bylaws), some of which have a number of sub-projects. Unlike some other organizations that host FOSS projects, before a project is hosted at Apache it has to be licensed to the ASF with a grant or contributor agreement. In this way, the ASF gains the necessary intellectual property rights for the development and distribution of all its projects.
Board of directors.
The board of directors of The Apache Software Foundation (ASF) is responsible for management and oversight of the business and affairs of the corporation in accordance with the Bylaws. This includes management of the corporate assets (funds, intellectual property, trademarks, and support equipment), appointment of a President and corporate officers managing the core operations of the ASF, and allocation of corporate resources for the benefit of Apache projects. Technical decision-making authority for every Apache project is assigned to their independent project management committee; the participants in each project provide direction, not the board.
The board is elected annually by the ASF membership.
Since March 6, 2025, the board of directors has been:
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Americans with Disabilities Act of 1990
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The Americans with Disabilities Act of 1990 or ADA () is a civil rights law that prohibits discrimination based on disability. It affords similar protections against discrimination to Americans with disabilities as the Civil Rights Act of 1964, which made discrimination based on race, religion, sex, national origin, and other characteristics illegal, and later sexual orientation and gender identity. In addition, unlike the Civil Rights Act, the ADA also requires covered employers to provide reasonable accommodations to employees with disabilities, and imposes accessibility requirements on public accommodations.
In 1986, the National Council on Disability had recommended the enactment of an Americans with Disabilities Act and drafted the first version of the bill which was introduced in the House and Senate in 1988. A broad bipartisan coalition of legislators supported the ADA, while the bill was opposed by business interests (who argued the bill imposed costs on business) and conservative evangelicals (who opposed protection for individuals with HIV). The final version of the bill was signed into law on July 26, 1990, by President George H. W. Bush. It was later amended in 2008 and signed by President George W. Bush with changes effective as of January 1, 2009.
Disabilities included.
Conditions classed as disabilities under the ADA include both mental and physical conditions. A condition does not need to be severe or permanent to be a disability. Equal Employment Opportunity Commission regulations provide a list of conditions that should easily be concluded to be disabilities: amputation, attention deficit hyperactivity disorder (ADHD), autism, bipolar disorder, blindness, cancer, cerebral palsy, deafness, diabetes, epilepsy, HIV/AIDS, intellectual disability, major depressive disorder, mobility impairments requiring a wheelchair, multiple sclerosis, muscular dystrophy, obsessive–compulsive disorder (OCD), post-traumatic stress disorder (PTSD), and schizophrenia. Other mental or physical health conditions also may be disabilities, depending on what the individual's symptoms would be in the absence of "mitigating measures" such as medication, therapy, assistive devices, or other means of restoring function, during an "active episode" of the condition (if the condition is episodic).
Certain specific conditions that are widely considered anti-social, or tend to result in illegal activity, such as kleptomania, pedophilia, exhibitionism, and voyeurism, are excluded under the definition of "disability" in order to prevent abuse of the statute's purpose. Additionally, sexual orientation is no longer considered a disorder and is also excluded from the definition of "disability". However, in 2022, the United States Court of Appeals for the Fourth Circuit stated that the ADA covers individuals with gender dysphoria, which may aid transgender people in accessing legal protections they otherwise may be unable to.
"See also US labor law and ."
Titles.
Title I—employment.
The ADA states that a "covered entity" shall not discriminate against "a qualified individual with a disability". This applies to job application procedures, hiring, advancement and discharge of employees, job training, and other terms, conditions, and privileges of employment. "Covered entities" include employers with 15 or more employees, as well as employment agencies, labor organizations, and joint labor-management committees. There are strict limitations on when a covered entity can ask job applicants or employees disability-related questions or require them to undergo medical examination, and all medical information must be kept confidential.
Prohibited discrimination may include, among other things, firing or refusing to hire someone based on a real or perceived disability, segregation, and harassment based on a disability. Covered entities are also required to provide reasonable accommodations to job applicants and employees with disabilities. A reasonable accommodation is a change in the way things are typically done that the person needs because of a disability, and can include, among other things, special equipment that allows the person to perform the job, scheduling changes, and changes to the way work assignments are chosen or communicated. An employer is not required to provide an accommodation that would involve undue hardship (excessive difficulty or expense), and the individual who receives the accommodation must still perform the essential functions of the job and meet the normal performance requirements. An employee or applicant who currently engages in the illegal use of drugs is not considered qualified when a covered entity takes adverse action based on such use.
Part of Title I was found unconstitutional by the United States Supreme Court as it pertains to states in the case of "Board of Trustees of the University of Alabama v. Garrett" as violating the sovereign immunity rights of the several states as specified by the Eleventh Amendment to the United States Constitution. The Court determined that state employees cannot sue their employer for violating ADA rules. State employees can, however, file complaints at the Department of Justice or the Equal Employment Opportunity Commission, who can sue on their behalf.
Title II—public entities (and public transportation).
Title II prohibits disability discrimination by all public entities at the local level, e.g., school district, municipal, city, or county, and at state level. Public entities must comply with Title II regulations by the U.S. Department of Justice. These regulations cover access to all programs and services offered by the entity. Access includes physical access described in the ADA Standards for Accessible Design and programmatic access that might be obstructed by discriminatory policies or procedures of the entity.
Title II applies to public transportation provided by public entities through regulations by the U.S. Department of Transportation. It includes the National Railroad Passenger Corporation (Amtrak), along with all other commuter authorities. This section requires the provision of paratransit services by public entities that provide fixed-route services. ADA also sets minimum requirements for space layout in order to facilitate wheelchair securement on public transport.
Title II also applies to all state and local public housing, housing assistance, and housing referrals. The Office of Fair Housing and Equal Opportunity is charged with enforcing this provision.
Title III—public accommodations (and commercial facilities).
Under Title III, no individual may be discriminated against on the basis of disability with regards to the full and equal enjoyment of the goods, services, facilities, or accommodations of any place of public accommodation by any person who owns, leases, or operates a place of public accommodation. Public accommodations include most places of lodging (such as inns and hotels), recreation, transportation, education, and dining, along with stores, care providers, and places of public displays.
Under Title III of the ADA, all new construction (construction, modification or alterations) after the effective date of the ADA (approximately July 1992) must be fully compliant with the Americans With Disabilities Act Accessibility Guidelines (ADAAG) found in the Code of Federal Regulations at 28 C.F.R., Part 36, Appendix "A".
Title III also has applications to existing facilities. One of the definitions of "discrimination" under Title III of the ADA is a "failure to remove" architectural barriers in existing facilities. See . This means that even facilities that have not been modified or altered in any way after the ADA was passed still have obligations. The standard is whether "removing barriers" (typically defined as bringing a condition into compliance with the ADAAG) is "readily achievable", defined as "...easily accomplished without much difficulty or expense".
The statutory definition of "readily achievable" calls for a balancing test between the cost of the proposed alteration and the wherewithal of the business and/or owners of the business. Thus, what might be "readily achievable" for a sophisticated and financially capable corporation might not be readily achievable for a small or local business.
There are exceptions to this title; many private clubs and religious organizations may not be bound by Title III. With regard to historic properties (those properties that are listed or that are eligible for listing in the National Register of Historic Places, or properties designated as historic under state or local law), those facilities must still comply with the provisions of Title III of the ADA to the "maximum extent feasible" but if following the usual standards would "threaten to destroy the historic significance of a feature of the building" then alternative standards may be used.
Under 2010 revisions of Department of Justice regulations, newly constructed or altered swimming pools, wading pools, and spas must have an accessible means of entrance and exit to pools for disabled people. However, the requirement is conditioned on whether providing access through a fixed lift is "readily achievable". Other requirements exist, based on pool size, include providing a certain number of accessible means of entry and exit, which are outlined in Section 242 of the standards. However, businesses are free to consider the differences in the application of the rules depending on whether the pool is new or altered, or whether the swimming pool was in existence before the effective date of the new rule. Full compliance may not be required for existing facilities; Section 242 and 1009 of the 2010 Standards outline such exceptions.
Service animals.
ADA provides explicit coverage for service animals. Guidelines protect persons with disabilities and indemnify businesses from damages related to granting access to service animals. Businesses are allowed to ask if the animal is a service animal and ask what tasks it is trained to perform, but are not allowed to ask the service animal to perform the task nor ask for an animal ID. They cannot ask what the person's disabilities are. A person with a disability cannot be removed from the premises unless one of two things happen: the animal is out of control and its owner cannot control it (e.g., a dog barking uncontrollably), or the animal is a direct threat to someone's health and safety. Allergies and fear of animals are not considered to be such a threat.
Businesses that prepare or serve food must allow service animals and their owners on the premises even if state or local health laws otherwise prohibit animals. Businesses that prepare or serve food are not required to provide care, food, a relief area for service animals. Extra fees for service animals are forbidden. They cannot be discriminated against, such as by isolation from people at a restaurant.
People with disabilities cannot be treated as "less than" other customers. However, if a business normally charges for damages caused by the person to property, damage caused by a service animal can also require compensation.
Auxiliary aids.
The ADA provides explicit coverage for auxiliary aids.
ADA says that "a public accommodation shall take those steps that may be necessary to ensure that no individual with a disability is excluded, denied services, segregated or otherwise treated differently than other individuals because of the absence of auxiliary aids and services, unless the public accommodation can demonstrate that taking those steps would fundamentally alter the nature of the goods, services, facilities, privileges, advantages, or accommodations being offered or would result in an undue burden, i.e., significant difficulty or expense." The term "auxiliary aids and services" includes:
Captions are considered one type of auxiliary aid. Since the passage of the ADA, the use of captioning has expanded. Entertainment, educational, informational, and training materials are captioned for deaf and hard-of-hearing audiences at the time they are produced and distributed. The Television Decoder Circuitry Act of 1990 requires that all televisions larger than 13 inches sold in the United States after July 1993 have a special built-in decoder that enables viewers to watch closed-captioned programming. The Telecommunications Act of 1996 directs the Federal Communications Commission (FCC) to adopt rules requiring closed captioning of most television programming. The FCC's rules on closed captioning became effective January 1, 1998.
Title IV—telecommunications.
Title IV of the ADA amended the Communications Act of 1934 primarily by adding section . This section requires that all telecommunications companies in the U.S. take steps to ensure functionally equivalent services for consumers with disabilities, notably those who are deaf or hard of hearing and those with speech impairments. When Title IV took effect in the early 1990s, it led to the installation of public teletypewriter (TTY) machines and other TDD (telecommunications devices for the deaf). Title IV also led to the creation, in all 50 states and the District of Columbia, of what was then called dual-party relay services and now are known as Telecommunications Relay Services (TRS), such as STS relay. Today, many TRS-mediated calls are made over the Internet by consumers who use broadband connections. Some are Video Relay Service (VRS) calls, while others are text calls. In either variation, communication assistants translate between the signed or typed words of a consumer and the spoken words of others. In 2006, according to the Federal Communications Commission (FCC), VRS calls averaged two million minutes a month.
Title V—miscellaneous provisions.
Title V includes technical provisions. It discusses, for example, the fact that nothing in the ADA amends, overrides or cancels anything in Section 504. Additionally, Title V includes an anti-retaliation or coercion provision. The "Technical Assistance Manual" for the ADA explains this provision:
History.
The ADA has roots in Section 504 of the Rehabilitation Act of 1973.
Drafting.
The law began in the Virginia House of Delegates in 1985 as the Virginians with Disabilities Act—supported by Warren G. Stambaugh—which was passed by the Virginia General Assembly. It is the first iteration of the Americans with Disabilities Act.
In 1986, the National Council on Disability (NCD), an independent federal agency, issued a report, Towards Independence, in which the Council examined incentives and disincentives in federal laws towards increasing the independence and full integration of people with disabilities into U.S. society. Among the disincentives to independence the Council identified was the existence of large remaining gaps in civil rights coverage for people with disabilities in the United States. A principal conclusion of the report was to recommend the adoption of comprehensive civil rights legislation, which became the ADA.
The idea of federal legislation enhancing and extending civil rights legislation to millions of Americans with disabilities gained bipartisan support in late 1988 and early 1989. In early 1989 both Congress and the newly inaugurated Bush White House worked separately, then jointly, to write legislation capable of expanding civil rights without imposing undue harm or costs on those already in compliance with existing rules and laws.
Lobbying.
Over the years, key activists and advocates played an important role in lobbying members of the U.S. Congress to develop and pass the ADA, including Justin Whitlock Dart Jr., Patrisha Wright and others.
Wright is known as "the General" for her work in coordinating the campaign to enact the ADA. She is widely considered the main force behind the campaign lobbying for the ADA.
Support and opposition.
Support.
Senator Bob Dole, who himself had a disability resulting from war injuries, was a vocal supporter and advocate for the bill. Senators Ted Kennedy and Tom Harkin were the chief sponsors of the bill in the Senate. Kennedy described this bill as "an emancipation proclamation for the disabled, and [argued that] America will be a better, fairer, and stronger nation because of it."
Opposition from religious groups.
Conservative evangelicals opposed the ADA because the legislation protected individuals with HIV, which they associated with homosexuality.
The debate over the Americans with Disabilities Act led some religious groups to take opposite positions. The Association of Christian Schools International opposed the ADA in its original form, primarily because the ADA labeled religious institutions "public accommodations" and thus would have required churches to make costly structural changes to ensure access for all. The cost argument advanced by ACSI and others prevailed in keeping religious institutions from being labeled as "public accommodations". Church groups such as the National Association of Evangelicals testified against the ADA's Title I employment provisions on grounds of religious liberty. The NAE believed the regulation of the internal employment of churches was "... an improper intrusion [of] the federal government."
Opposition from business interests.
Many companies, corporations, and business groups opposed the Americans with Disabilities Act, arguing that the legislation would impose costs on businesses. Testifying before Congress, Greyhound Bus Lines stated that the act had the potential to "deprive millions of people of affordable intercity public transportation and thousands of rural communities of their only link to the outside world." The US Chamber of Commerce argued that the costs of the ADA would be "enormous" and have "a disastrous impact on many small businesses struggling to survive." The National Federation of Independent Business, an organization that lobbies for small businesses, called the ADA "a disaster for small business". Pro-business conservative commentators joined in opposition, writing that the Americans with Disabilities Act was "an expensive headache to millions" that would not necessarily improve the lives of people with disabilities.
"Capitol Crawl".
Shortly before the act was passed, disability rights activists with physical disabilities coalesced in front of the Capitol Building, shed their crutches, wheelchairs, powerchairs and other assistive devices, and immediately proceeded to crawl and pull their bodies up all 100 of the Capitol's front steps, without warning. As the activists did so, many of them chanted "ADA now", and "Vote, Now". Some activists who remained at the bottom of the steps held signs and yelled words of encouragement at the "Capitol Crawlers". Jennifer Keelan, a second grader with cerebral palsy, was videotaped as she pulled herself up the steps, using mostly her hands and arms, saying "I'll take all night if I have to." This direct action is reported to have "inconvenienced" several senators and to have pushed them to approve the act. While there are those who do not attribute much overall importance to this action, the "Capitol Crawl" of 1990 is seen by some present-day disability activists in the United States as a central act for encouraging the ADA into law.
Final passage.
Senator Tom Harkin (D-IA) authored what became the final bill and was its chief sponsor in the Senate. Harkin delivered part of his introduction speech in sign language, saying it was so his deaf brother could understand.
President George H. W. Bush, on signing the measure on July 26, 1990, said:
ADA Amendments Act, 2008.
The ADA defines a covered disability as a physical or mental impairment that substantially limits one or more major life activities, a history of having such an impairment, or being regarded as having such an impairment. The Equal Employment Opportunity Commission (EEOC) was charged with interpreting the 1990 law with regard to discrimination in employment. The EEOC developed regulations limiting an individual's impairment to one that "severely or significantly restricts" a major life activity. The ADAAA directed the EEOC to amend its regulations and replace "severely or significantly" with "substantially limits", a more lenient standard.
On September 25, 2008, President George W. Bush signed the ADA Amendments Act of 2008 (ADAAA) into law. The amendment broadened the definition of "disability", thereby extending the ADA's protections to a greater number of people. The ADAAA also added to the ADA examples of "major life activities" including, but not limited to, "caring for oneself, performing manual tasks, seeing, hearing, eating, sleeping, walking, standing, lifting, bending, speaking, breathing, learning, reading, concentrating, thinking, communicating, and working" as well as the operation of several specified "major bodily functions". The act overturned a 1999 US Supreme Court case that held that an employee was not disabled if the impairment could be corrected by mitigating measures; it specifically provides that such impairment must be determined without considering such ameliorative measures. It also overturned the court's finding that an impairment that substantially limits one major life activity must also limit others to be considered a disability.
In 2008, the United States House Committee on Education and Labor stated that the amendment "makes it absolutely clear that the ADA is intended to provide broad coverage to protect anyone who faces discrimination on the basis of disability." Thus the ADAAA led to broader coverage of impaired employees.
Web Content Accessibility Guidelines, 2019.
In October 2019, the Supreme Court declined to resolve a circuit split as to whether websites are covered by the ADA. The Court turned down an appeal from Domino's Pizza and let stand a U.S. 9th Circuit Court of Appeals ruling which held that the Americans with Disabilities Act protects access not just to brick-and-mortar public accommodations, but also to the websites and apps of those businesses.
Impact.
The ADA led to significant improvements in terms of access to public services, accessibility in the built environment, and societal understanding of disability.
Employment.
Between 1991 (after the enactment of the ADA) and 1995, the employment rate of men with disabilities dropped by 7.8% regardless of age, educational level, or type of disability, with the most affected being young, less-educated and intellectually disabled men. Although no causal link between the ADA and that trend has been definitively identified, some researchers have characterized the ADA as ineffectual and argued that it caused this decline by raising the cost of doing business for employers, who quietly avoid hiring people with disabilities for fear of lawsuit. To these employers, hiring people with disabilities became too expensive as they had to spend extra on assistive technology.
From 2015 to 2024, employment trends for workers with disabilities showed mixed progress under the ADA. According to the U.S. Bureau of Labor Statistics, the employment rate for people with disabilities aged 16–64 increased from 17.5% in 2015 to 21.3% in 2023, with record gains in 2023 driven by a tight labor market and increased remote work opportunities, though it remained significantly lower than the 61.8% rate for those without disabilities. The unemployment rate for disabled workers also improved. It dropped to a low of 7.2% in 2023 -- a number that it still twice that of nondisabled workers (3.5%). Policy updates, such as the 2014 Workforce Innovation and Opportunity Act (WIOA), emphasized integrated employment and strengthened affirmative action for federal contractors under Section 503 of the Rehabilitation Act. Barriers, including wage gaps (disabled workers earned 66 cents for every dollar earned by nondisabled workers in 2023) and Section 14(c) of the Fair Labor Standards Act which allows subminimum wages, have drawn criticism from advocates. EEOC data from 2017 showed that 32% of all discrimination charges filed involved disability, highlighting ongoing enforcement challenges
Evasion and unintended consequences.
Edward Jay Epstein blamed the act for the replacement of large single-screen movie palaces with multiplexes with many screens. According to Epstein, the act imposed wheelchair ramp requirements on new or renovated movie theaters with more than 299 seats, so industry leader AMC Theatres and its competitors evaded this by dividing multiplexes as much as possible into small auditoriums with 299 seats or less. Then to fill all those seats, exhibitors began to book the same film across multiple screens with showtimes every hour or half hour. This helped finish off the traditional system of zones and clearances that had resulted in a much larger overall inventory of films (i.e., B movies) in the Golden Age of Hollywood, and Hollywood studios shifted to producing a smaller total number of big-budget blockbuster films to bring foot traffic into multiplexes.
"Professional plaintiffs".
Since enforcement of the act began in July 1992, it has quickly become a major component of employment law. The ADA allows private plaintiffs to receive only injunctive relief (a court order requiring the public accommodation to remedy violations of the accessibility regulations) and attorneys' fees, and does not provide monetary rewards to private plaintiffs who sue non-compliant businesses. Unless a state law, such as the California Unruh Civil Rights Act, provides for monetary damages to private plaintiffs, persons with disabilities do not obtain direct financial benefits from suing businesses that violate the ADA.
The attorneys' fees provision of Title III does provide incentive for lawyers to specialize and engage in serial ADA litigation, but a disabled plaintiff does not obtain a financial reward from attorneys' fees unless they act as their own attorney, or as mentioned above, a disabled plaintiff resides in a state that provides for minimum compensation and court fees in lawsuits. Moreover, there may be a benefit to these private attorneys general who identify and compel the correction of illegal conditions: they may increase the number of public accommodations accessible to persons with disabilities. "Civil rights law depends heavily on private enforcement. Moreover, the inclusion of penalties and damages is the driving force that facilitates voluntary compliance with the ADA." Courts have noted:
However, in states that have enacted laws that allow private individuals to win monetary awards from non-compliant businesses (as of 2008, these include California, Florida, Hawaii, and Illinois), "professional plaintiffs" are typically found. At least one of these plaintiffs in California has been barred by courts from filing lawsuits unless he receives prior court permission. Through the end of fiscal year 1998, 86% of the 106,988 ADA charges filed with and resolved by the Equal Employment Opportunity Commission, were either dropped or investigated and dismissed by EEOC but not without imposing opportunity costs and legal fees on employers.
Case law.
There have been some notable cases regarding the ADA. For example, a major hotel room marketer (Hotels.com) with their business presence on the Internet was sued because their customers with disabilities could not reserve hotel rooms through their website without substantial extra efforts that persons without disabilities were not required to perform. Such lawsuits represent a major potential expansion of the ADA in that they (known as "bricks vs. clicks"), seek to expand the ADA's authority to cyberspace, where entities may not have actual physical facilities that are required to comply.
"Paralyzed Veterans of America v. Ellerbe Becket Architects and Engineers".
One of the first major ADA lawsuits, Paralyzed Veterans of America v. Ellerbe Becket Architects and Engineers (PVA 1996) was focused on the wheelchair accessibility of a stadium project that was still in the design phase, MCI Center (now known as Capital One Arena) in Washington, D.C. Previous to this case, which was filed only five years after the ADA was passed, the DOJ was unable or unwilling to provide clarification on the distribution requirements for accessible wheelchair locations in large assembly spaces. While Section 4.33.3 of ADAAG makes reference to lines of sight, no specific reference is made to seeing over standing patrons. The MCI Center, designed by Ellerbe Becket Architects & Engineers, was designed with too few wheelchair and companion seats, and the ones that were included did not provide sight lines that would enable the wheelchair user to view the playing area while the spectators in front of them were standing. This case and another related case established precedent on seat distribution and sight lines issues for ADA enforcement that continues to present day."
"Green v. State of California".
"Green v. State of California, No. S137770 (Cal. August 23, 2007)" was a case in which the California Supreme Court was faced with deciding whether an employee suing the state is required to prove they are able to perform "essential" job duties, regardless of whether or not there was "reasonable accommodation", or if the employer must prove the person suing was unable to do so. The court ruled the burden was on the employee, not the employer, and reversed a disputed decision by the lower courts. Plaintiff attorney David Greenberg brought forth considerations of the concept that, even in the state of California, employers do not have to employ a worker who is unable to perform "essential job functions" with "reasonable accommodation". Forcing employers to do so "would defy logic and establish a poor public policy in employment matters."
"National Federation of the Blind v. Target Corporation".
"National Federation of the Blind v. Target Corp." was a case where a major retailer, Target Corp., was sued because their web designers failed to design its website to enable persons with low or no vision to use it.
"Board of Trustees of the University of Alabama v. Garrett".
"Board of Trustees of the University of Alabama v. Garrett" was a United States Supreme Court case about Congress's enforcement powers under the Fourteenth Amendment to the Constitution. It decided that Title I of the Americans with Disabilities Act was unconstitutional insofar as it allowed private citizens to sue states for money damages.
"Barden v. The City of Sacramento".
"Barden v. The City of Sacramento", filed in March 1999, claimed that the City of Sacramento failed to comply with the ADA when, while making public street improvements, it did not bring its sidewalks into compliance with the ADA. Certain issues were resolved in federal court. One issue, whether sidewalks were covered by the ADA, was appealed to the 9th Circuit Court of Appeals, which ruled that sidewalks were a "program" under the ADA and must be made accessible to persons with disabilities. The ruling was later appealed to the U.S. Supreme Court, which refused to hear the case, letting stand the ruling of the 9th Circuit.
"Bates v. United Parcel Service, Inc".
"Bates v. United Parcel Service, Inc (UPS;" begun in 1999) was the first equal opportunity employment class action brought on behalf of Deaf and Hard of Hearing workers throughout the country concerning workplace discrimination. It established legal precedent for these employees to be fully covered under the ADA. Key findings included:
The outcome was that UPS agreed to pay a $5.8 million settlement and agreed to a comprehensive accommodations program that was implemented in their facilities throughout the country.
"Spector v. Norwegian Cruise Line Ltd.".
"Spector v. Norwegian Cruise Line Ltd." was decided by the United States Supreme Court in 2005. The defendant argued that as a vessel flying the flag of a foreign nation it was exempt from the requirements of the ADA. This argument was accepted by a federal court in Florida and, subsequently, the Fifth Circuit Court of Appeals. However, the U.S. Supreme Court reversed the ruling of the lower courts on the basis that Norwegian Cruise Lines was a business headquartered in the United States whose clients were predominantly Americans and, more importantly, operated out of port facilities throughout the United States.
"Olmstead v. L.C.".
"Olmstead v. L.C." was a case before the United States Supreme Court in 1999. The two plaintiffs, Lois Curtis and E.W., were institutionalized in Georgia for diagnosed "mental retardation" and schizophrenia. Clinical assessments by the state determined that the plaintiffs could be appropriately treated in a community setting rather than the state institution. The plaintiffs sued the state of Georgia and the institution for being inappropriately treated and housed in the institutional setting rather than being treated in one of the state's community-based treatment facilities.
The Supreme Court decided under Title II of the ADA that mental illness is a form of disability and therefore covered under the ADA, and that unjustified institutional isolation of a person with a disability is a form of discrimination because it "...perpetuates unwarranted assumptions that persons so isolated are incapable or unworthy of participating in community life." The court added, "Confinement in an institution severely diminishes the everyday life activities of individuals, including family relations, social contacts, work options, economic independence, educational advancement, and cultural enrichment."
Therefore, under Title II no person with a disability can be unjustly excluded from participation in or be denied the benefits of services, programs or activities of any public entity.
"Michigan Paralyzed Veterans of America v. The University of Michigan".
"Michigan Paralyzed Veterans of America v. The University of Michigan" was a case filed before the United States District Court for the Eastern District of Michigan. It was filed on behalf of the Michigan Paralyzed Veterans of America against the University of Michigan claiming that Michigan Stadium violated the Americans with Disabilities Act in its $226-million renovation by failing to add enough seats for disabled fans or accommodate the needs for disabled restrooms, concessions and parking. Additionally, the distribution of the accessible seating was at issue, with nearly all the seats being provided in the end-zone areas. The U.S. Department of Justice assisted in the suit, which was settled in March 2008. The settlement required the stadium to add 329 wheelchair seats throughout the stadium by 2010, and an additional 135 accessible seats in clubhouses to go along with the existing 88 wheelchair seats. This case was significant because it set a precedent for the uniform distribution of accessible seating and gave the DOJ the opportunity to clarify previously unclear rules. The agreement now is a blueprint for all stadiums and other public facilities regarding accessibility.
"Toyota Motor Manufacturing, Kentucky, Inc. v. Williams".
"Toyota Motor Manufacturing, Kentucky, Inc. v. Williams", was a case in which the US Supreme Court interpreted the meaning of the phrase "substantially impairs" as used in the Americans with Disabilities Act. It reversed a Sixth Circuit Court of Appeals decision to grant partial summary judgment in favor of the respondent, Ella Williams, that classified her inability to perform manual job-related tasks as a disability. The Court held that the "major life activity" definition for evaluating the performance of manual tasks focuses the inquiry on whether Williams was unable to perform a range of tasks central to most people in carrying out the activities of daily living, not whether Williams was unable to perform her specific job tasks. Therefore, the determination of whether an impairment rises to the level of a disability is not limited to activities in the workplace solely, but rather to manual tasks in life in general. When the Supreme Court applied this standard, it found that the Court of Appeals had incorrectly determined the presence of a disability because it relied solely on her inability to perform specific manual work tasks, which was insufficient in proving the presence of a disability. The Court of Appeals should have taken into account the evidence presented that Williams retained the ability to do personal tasks and household chores, such activities being the nature of tasks most people do in their daily lives, and placed too much emphasis on her job disability. Since the evidence showed that Williams was performing normal daily tasks, it ruled that the Court of Appeals erred when it found that Williams was disabled. This ruling has since been legislatively overturned by the ADA Amendments Act of 2008 (ADAAA). In fact, Congress explicitly cited "Toyota v. Williams" in the text of the ADAAA itself as one of its driving influences for passing the ADAAA.
"US Airways, Inc. v. Barnett".
"US Airways, Inc. v. Barnett" was decided by the US Supreme Court in 2002. This case held that even requests for accommodation that might seem reasonable on their face, e.g., a transfer to a different position, can be rendered unreasonable because it would require a violation of the company's seniority system. While the court held that, in general, a violation of a seniority system renders an otherwise reasonable accommodation unreasonable, a plaintiff can present evidence that, despite the seniority system, the accommodation is reasonable in the specific case at hand, e.g., the plaintiff could offer evidence that the seniority system is so often disregarded that another exception would not make a difference.
Importantly, the court held that the defendant need not provide proof that this particular application of the seniority system should prevail, and that, once the defendant showed that the accommodation violated the seniority system, it fell to Barnett to show it was nevertheless reasonable.
In this case, Barnett was a US Airways employee who injured his back, rendering him physically unable to perform his cargo-handling job. Invoking seniority, he transferred to a less-demanding mailroom job, but this position later became open to seniority-based bidding and was bid on by more senior employees. Barnett requested the accommodation of being allowed to stay on in the less-demanding mailroom job. US Airways denied his request, and he lost his job.
The Supreme Court decision invalidated both the approach of the district court, which found that the mere presence and importance of the seniority system was enough to warrant a summary judgment in favor of US Airways, as well as the circuit court's approach that interpreted 'reasonable accommodation' as 'effective accommodation.'
"Access Now v. Southwest Airlines".
"Access Now, Inc. v. Southwest Airlines Co." was a 2002 case where the District Court decided that the website of Southwest Airlines was not in violation of the Americans with Disabilities Act, because the ADA is concerned with things with a physical existence and thus cannot be applied to cyberspace. Judge Patricia A. Seitz found that the "virtual ticket counter" of the website was a virtual construct, and hence not a "public place of accommodation". As such, "To expand the ADA to cover 'virtual' spaces would be to create new rights without well-defined standards."
"Ouellette v. Viacom International Inc.".
"Ouellette v. Viacom International Inc." (2011) held that a mere online presence does not subject a website to the ADA guidelines. Thus Myspace and YouTube were not liable for a dyslexic man's inability to navigate the site regardless of how impressive the "online theater" is.
"Authors Guild v. HathiTrust".
"Authors Guild v. HathiTrust" was a case in which the District Court decided that the HathiTrust digital library was a transformative, fair use of copyrighted works, making a large number of written text available to those with print disability.
"Zamora-Quezada v. HealthTexas Medical Group".
"Zamora-Quezada v. HealthTexas Medical Group" (begun in 1998) was the first time this act was used against HMOs when a novel lawsuit was filed by Texas attorney Robert Provan against five HMOs for their practice of revoking the contracts of doctors treating disabled patients. In 1999, these HMOs sought to dismiss Provan's lawsuit, but a federal court ruled against them, and the case was settled out of court. Many decisions relating to Provan's unique lawsuit against these HMOs have been cited in other court cases since.
"Campbell v. General Dynamics Government Systems Corp.".
"Campbell v. General Dynamics Government Systems Corp." (2005) concerned the enforceability of a mandatory arbitration agreement contained in a dispute resolution policy linked to an e-mailed company-wide announcement, insofar as it applies to employment discrimination claims brought under the Americans with Disabilities Act.
"Tennessee v. Lane".
"Tennessee v. Lane", 541 U.S. 509 (2004), was a case in the Supreme Court of the United States involving Congress's enforcement powers under section 5 of the Fourteenth Amendment. George Lane was unable to walk after a 1997 car accident in which he was accused of driving on the wrong side of the road. A woman was killed in the crash, and Lane faced misdemeanor charges of reckless driving. The suit was brought about because he was denied access to appear in criminal court because the courthouse had no elevator, even though the court was willing to carry him up the stairs and then willing to move the hearing to the first floor. He refused, citing he wanted to be treated as any other citizen, and was subsequently charged with failure to appear, after appearing at a previous hearing where he dragged himself up the stairs. The court ruled that Congress did have enough evidence that disabled people were being denied those fundamental rights that are protected by the Due Process clause of the Fourteenth Amendment and had the enforcement powers under section 5 of the Fourteenth Amendment. It further ruled that "reasonable accommodations" mandated by the ADA were not unduly burdensome and disproportionate to the harm.
Gender dysphoria.
In 2022, the United States Court of Appeals for the Fourth Circuit stated that the ADA covers individuals with gender dysphoria, which may aid transgender people in accessing legal protections they otherwise may be unable to.
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Apple I
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The Apple Computer 1 (Apple-1), later known predominantly as the Apple I, is an 8-bit personal computer designed by Steve Wozniak and released by the Apple Computer Company (now Apple Inc.) in 1976. The company was initially formed to sell the Apple Iits first product and would later become the world's largest technology company. The idea of starting a company and selling the computer came from Wozniak's friend and Apple co-founder Steve Jobs. A differentiator of the Apple I was that it included video display terminal circuitry, allowing it to connect to a low-cost composite video monitor and keyboard instead of an expensive accompanying terminal. The Apple I and the Sol-20 were some of the earliest home computers to have this capability.
To finance the Apple I's development, Wozniak and Jobs sold some of their possessions for a few hundred dollars. Wozniak demonstrated the first prototype in July 1976 at the Homebrew Computer Club in Palo Alto, California, impressing the Byte Shop, an early computer retailer. After securing an order for 50 computers, Jobs was able to order the parts on credit and deliver the first Apple products after ten days.
The Apple I was one of the first computers available that used the MOS Technology 6502 microprocessor. An expansion included a BASIC interpreter, allowing users to utilize BASIC at home instead of at institutions with mainframe computers, greatly lowering the entry cost for computing with BASIC.
Production was discontinued on September 30, 1977, after the June 10, 1977 introduction of its successor, the Apple II, which "Byte" magazine referred to as part of the "1977 Trinity" of personal computing (along with the PET 2001 from Commodore Business Machines and the TRS-80 Model I from Tandy Corporation). As relatively few computers were made before they were discontinued, coupled with their status as Apple's first product, surviving Apple I units are now displayed in computer museums.
History.
Development.
In 1974, while visiting famous phone phreak John Draper in California, Steve Wozniak watched him connect a modem to the ARPANET – the precursor to the internet – and use a teleprinter to play chess with someone from Boston; this inspired him to make a cheap terminal that used an inexpensive keyboard from Sears and a standard TV. Later in March 1975, Wozniak started attending meetings of the Homebrew Computer Club, which was a major source of inspiration for him. New microcomputers such as the Altair 8800 inspired Wozniak to build a microprocessor into his video terminal circuit to make a complete computer. At the time the only appropriate CPUs available were the Intel 8080, and the Motorola 6800. Of these options, Wozniak preferred the 6800, though he was financially unable to obtain either. Instead, he began designing computers on paper until he could afford a CPU.
When the $25 MOS Technology 6502 was released in late 1975, Wozniak wrote a version of BASIC for it, then began to design a computer for it to run on. The 6502 was developed by many of the same engineers that designed the 6800, as many in Silicon Valley left employers to form their own companies. Wozniak's earlier 6800 computer design needed only minor changes to run on the new processor.
By March 1, 1976, Wozniak completed the basic design of his computer. Wozniak originally offered the design to HP while working there, but it was rejected by the company on five occasions. When he demonstrated his computer at the Homebrew Computer Club, his friend and fellow club regular Steve Jobs was immediately interested in its commercial potential. Wozniak intended to share schematics of the machine for free; however, Jobs advised him to start a business together and sell bare printed circuit boards for the computer, without any components soldered on. Wozniak, at first skeptical, was later convinced by Jobs that even if they were not successful they could at least say to their grandchildren that they had had their own company. To raise the money they needed to build the first batch of the circuit boards, Wozniak sold his HP-65 scientific calculator while Jobs sold his Volkswagen van.
After the company was formed a month later, Jobs and Wozniak gave a presentation of the fully assembled "Apple Computer A" at the Homebrew Computer Club. Paul Terrell, who was starting a new computer shop in Mountain View, California, called the Byte Shop, saw the presentation and was impressed by the machine. Terrell told Jobs that he would order 50 units of the Apple I and pay $500 each on delivery, but only if they came fully assembledhe was not interested in buying bare printed circuit boards with no components.
Jobs took the purchase order from the Byte Shop to national electronic parts distributor Cramer Electronics, and ordered the components needed. When asked by the credit manager how he would pay for the parts, Jobs replied, "I have this purchase order from the Byte Shop chain of computer stores for 50 of my computers and the payment terms are COD. If you give me the parts on net 30-day terms I can build and deliver the computers in that time frame, collect my money from Terrell at the Byte Shop and pay you."
To verify the purchase order, the credit manager called Paul Terrell, who assured him if the computers showed up, Jobs would have more than enough money for the parts order. The two Steves and their small crew spent day and night building and testing the computers, and delivered to Terrell on time. Terrell was surprised to receive a batch of assembled circuit boards, as he had expected complete computers with a case, monitor and keyboard. Nonetheless, he kept his word and paid the two Steves the money promised.
Announcement and sales.
The Apple I went on sale in July 1976 at a price of . Wozniak later said he had no idea about the relation between the number and the number of the beast, and that he came up with the price because he liked "repeating digits" and because it was a one-third markup on the wholesale price. Jobs had managed to get the inventory into the nation's first four storefront microcomputer retailers: Byte Shop (Palo Alto, California), itty bitty machine company (Evanston, Illinois), Data Domain (Bloomington, Indiana), and Computer Mart (New York City).
The first unit produced was used in a high school math class, and donated to Liza Loop's public-access computer center. About 200 units were produced, and all but 25 were sold within nine or ten months.
In April 1977, the price was dropped to $475. It continued to be sold through August 1977, despite the introduction of the Apple II in April 1977, which began shipping in June of that year. In October 1977, the Apple I was officially discontinued and removed from Apple's price list. As Wozniak was the only person who could answer most customer support questions about the computer, the company offered Apple I owners discounts and trade-ins for Apple IIs to persuade them to return their computers. These recovered boards were then destroyed by Apple, contributing to their later rarity.
Both Steve Jobs and Steve Wozniak have stated that Apple did not assign serial numbers to the Apple l. Several boards have been found with numbered stickers affixed to them, which appear to be inspection stickers from the PCB manufacturer/assembler. A batch of boards is known to have numbers hand-written in black permanent marker on the back; these usually appear as "01-00##". As of January 2022, 29 Apple-1s with a serial number are known. The highest known number is . Two original Apple-1s have been analyzed by Professional Sports Authenticator in Los Angeles, concluding that the serial numbers had been hand-written by Steve Jobs.
Hardware.
The Apple I used a MOS Technology 6502 microprocessor running at , and its design was based largely on Wozniak's previous work centered around a Motorola 6800. The unconventional clock speed was chosen to be a fraction () of the NTSC color carrier, which simplified video circuitry. of memory was included on the base machine, which was expandable to on-board and up to by using an add-on card. On-board memory utilized newly available 4Kbit DRAM chips, and was designed to be upgradeable to the next generation of 16Kbit chips for a maximum of on-board memory. An optional $75 plug-in cassette interface card allowed users to store programs on ordinary audio cassette tapes. A BASIC interpreter, originally written by Wozniak, was provided with the cassette interface that let users easily write programs and play simple games. An onboard AC power supply was included.
The Apple I did not come with a case. It could be used bare, although some users chose to build custom (typically wooden) enclosures.
Video and Input.
The Apple I included built-in computer terminal circuitry with composite video output. To use the computer, a user-supplied composite monitor and ASCII-encoded keyboard needed to be connected. If a monitor was not available, a standard television set could be used along with an RF modulator. In comparison, competing machines generally required an expensive dedicated video display terminal or teletypewriter. This, combined with its single-board construction, made the Apple I an elegant and inexpensive machine for its day, though competitors such as the Sol-20 and Sphere 1 offered similar feature sets.
The computer generated its video output using a shift register memory and a Signetics 2513 64×8×5 Character Generator. It was capable of displaying uppercase characters, numbers and basic punctuation and math symbols with a 5x8 pixel font:
Apple Cassette Interface expansion.
A cassette interface was available in the form of an optional add-on for the Apple I's expansion slot. A cassette deck plugged in to the expansion's phone connector ports could be written to and read from as a form of removable storage. The only alternative to the interface for loading programs was typing machine code by hand, making the add-on "ubiquitous".
The expansion came with a free cassette tape containing Steve Wozniak's Integer BASIC interpreter. Other software tapes were supplied "at minimal cost" including ported video games such as "Hamurabi", "Lunar Lander" and "Star Trek".
Conservation.
Only about 200 Apple I boards were produced, and the whereabouts of 62 to 82 are known. After the success of the Apple II, and of Apple broadly, the Apple I was recognized as an important historical computer. According to the 1986 "Apple IIe Owner's Guide", an Apple I was then worth "between $10,000 and $15,000" and a board was reportedly sold for $50,000 in 1999.
In November 2010, an Apple I with a cache of original documents and packaging sold for £133,250 ($) at Christie's auction house in London. The documents included the return label showing Steve Jobs's parents' address, a personally typed and signed letter from Jobs (answering technical questions about the computer), and the invoice (listing "Steven" as the salesman). The computer was brought to Polytechnic University of Turin for restoration.
In October 2014 the Henry Ford Museum purchased an Apple I at a Bonhams auction for . The sale included the keyboard, monitor, cassette decks and a manual. In 2017, an Apple I removed from Steve Jobs's office in 1985 by Apple quality control engineer Don Hutmacher was placed on display at .
On May 30, 2015, an elderly woman reportedly dropped off boxes of electronics for disposal at an electronics recycling center in the Silicon Valley of Northern California. Included in the electronics (removed from her garage after the death of her husband) was an original Apple I computer, which the recycling firm sold for . When a discarded item is sold, it is the company's practice to give 50% of the proceeds to the original owner, but the woman has not been identified.
Apple I computers with original documents and memorabilia have frequently been auctioned for over $300,000 throughout the 2010s and 2020s. The production prototype for the Apple I survives in a badly damaged state and was itself auctioned in 2022 for $677,196.
Replicas.
Several Apple I clones and replicas have been released in recent years. These are created by hobbyists and marketed to the hobbyist/collector community. Availability is usually limited to small runs in response to demand.
Emulation.
Emulation software for the Apple I has been written for modern home computers and for web browsers. It has also been emulated on 1980s era computers including the SAM Coupé and Commodore 64.
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Apatosaurus
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Apatosaurus (; meaning "deceptive lizard") is a genus of herbivorous sauropod dinosaur that lived in North America during the Late Jurassic period. Othniel Charles Marsh described and named the first-known species, A. ajax, in 1877, and a second species, A. louisae, was discovered and named by William H. Holland in 1916. "Apatosaurus" lived about 152 to 151 million years ago (mya), during the late Kimmeridgian to early Tithonian age, and are now known from fossils in the Morrison Formation of modern-day Colorado, Oklahoma, New Mexico, Wyoming, and Utah in the United States. "Apatosaurus" had an average length of , and an average mass of . A few specimens indicate a maximum length of 11–30% greater than average and a mass of approximately .
The cervical vertebrae of "Apatosaurus" are less elongated and more heavily constructed than those of "Diplodocus", a diplodocid like "Apatosaurus", and the bones of the leg are much stockier despite being longer, implying that "Apatosaurus" was a more robust animal. The tail was held above the ground during normal locomotion. "Apatosaurus" had a single claw on each forelimb and three on each hindlimb. The "Apatosaurus" skull, long thought to be similar to "Camarasaurus", is much more similar to that of "Diplodocus". "Apatosaurus" was a generalized browser that likely held its head elevated. To lighten its vertebrae, "Apatosaurus" had air sacs that made the bones internally full of holes. Like that of other diplodocids, its tail may have been used as a whip to create loud noises, or, as more recently suggested, as a sensory organ.
The skull of "Apatosaurus" was confused with that of "Camarasaurus" and "Brachiosaurus" until 1909, when the holotype of "A. louisae" was found, and a complete skull just a few meters away from the front of the neck. Henry Fairfield Osborn disagreed with this association, and went on to mount a skeleton of "Apatosaurus" with a "Camarasaurus" skull cast. "Apatosaurus" skeletons were mounted with speculative skull casts until 1970, when McIntosh showed that more robust skulls assigned to "Diplodocus" were more likely from "Apatosaurus".
"Apatosaurus" is a genus in the family Diplodocidae. It is one of the more basal genera, with only "Amphicoelias" and possibly a new, unnamed genus more primitive. Although the subfamily Apatosaurinae was named in 1929, the group was not used validly until an extensive 2015 study. Only "Brontosaurus" is also in the subfamily, with the other genera being considered synonyms or reclassified as diplodocines. "Brontosaurus" has long been considered a junior synonym of "Apatosaurus"; its type species was reclassified as "A.excelsus" in 1903. A 2015 study concluded that "Brontosaurus" is a valid genus of sauropod distinct from "Apatosaurus", but not all paleontologists agree with this division. As it existed in North America during the late Jurassic, "Apatosaurus" would have lived alongside dinosaurs such as "Allosaurus", "Camarasaurus", "Diplodocus", and "Stegosaurus".
Description.
"Apatosaurus" was a large, long-necked, quadrupedal animal with a long, whip-like tail. Its forelimbs were slightly shorter than its hindlimbs. Most size estimates are based on specimen CM3018, the type specimen of "A.louisae", reaching in length and in body mass. A 2015 study that estimated the mass of volumetric models of "Dreadnoughtus", "Apatosaurus", and "Giraffatitan" estimates CM3018 at , similar in mass to "Dreadnoughtus". Some specimens of "A.ajax" (such as OMNH1670) represent individuals 1130% longer, suggesting masses twice that of CM3018 or , potentially rivaling the largest titanosaurs. However, the upper size estimate of OMNH1670 is likely an exaggeration, with the size estimates revised in 2020 at in length and in body mass based on volumetric analysis.
The skull is small in relation to the size of the animal. The jaws are lined with spatulate (chisel-like) teeth suited to an herbivorous diet. The snout of "Apatosaurus" and similar diplodocoids is squared, with only "Nigersaurus" having a squarer skull. The braincase of "Apatosaurus" is well preserved in specimen BYU17096, which also preserved much of the skeleton. A phylogenetic analysis found that the braincase had a morphology similar to those of other diplodocoids. Some skulls of "Apatosaurus" have been found still in articulation with their teeth. Those teeth that have the enamel surface exposed do not show any scratches on the surface; instead, they display a sugary texture and little wear.
Like those of other sauropods, the neck vertebrae are deeply bifurcated; they carried neural spines with a large trough in the middle, resulting in a wide, deep neck. The vertebral formula for the holotype of "A.louisae" is 15cervicals, 10dorsals, 5sacrals, and 82caudals. The caudal vertebra number may vary, even within species. The cervical vertebrae of "Apatosaurus" and "Brontosaurus" are stouter and more robust than those of other diplodocids and were found to be most similar to "Camarasaurus" by Charles Whitney Gilmore. In addition, they support cervical ribs that extend farther towards the ground than in diplodocines, and have vertebrae and ribs that are narrower towards the top of the neck, making the neck nearly triangular in cross-section. In "Apatosaurus louisae", the atlas-axis complex of the first cervicals is nearly fused. The dorsal ribs are not fused or tightly attached to their vertebrae and are instead loosely articulated. "Apatosaurus" has ten dorsal ribs on either side of the body. The large neck was filled with an extensive system of weight-saving air sacs. "Apatosaurus", like its close relative "Supersaurus", has tall neural spines, which make up more than half the height of the individual bones of its vertebrae. The shape of the tail is unusual for a diplodocid; it is comparatively slender because of the rapidly decreasing height of the vertebral spines with increasing distance from the hips. "Apatosaurus" also had very long ribs compared to most other diplodocids, giving it an unusually deep chest. As in other diplodocids, the tail transformed into a whip-like structure towards the end.
The limb bones are also very robust. Within Apatosaurinae, the scapula of "Apatosaurus louisae" is intermediate in morphology between those of "A.ajax" and "Brontosaurus excelsus". The arm bones are stout, so the humerus of "Apatosaurus" resembles that of "Camarasaurus", as well as "Brontosaurus". However, the humeri of "Brontosaurus" and "A.ajax" are more similar to each other than they are to "A.louisae". In 1936, Charles Gilmore noted that previous reconstructions of "Apatosaurus" forelimbs erroneously proposed that the radius and ulna could cross; in life they would have remained parallel. "Apatosaurus" had a single large claw on each forelimb, a feature shared by all sauropods more derived than "Shunosaurus". The first three toes had claws on each hindlimb. The phalangeal formula is 2-1-1-1-1, meaning the innermost finger (phalanx) on the forelimb has two bones and the next has one. The single manual claw bone (ungual) is slightly curved and squarely truncated on the anterior end. The pelvic girdle includes the robust ilia, and the fused (co-ossified) pubes and ischia. The femora of "Apatosaurus" are very stout and represent some of the most robust femora of any member of Sauropoda. The tibia and fibula bones are different from the slender bones of "Diplodocus" but are nearly indistinguishable from those of "Camarasaurus". The fibula is longer and slenderer than the tibia. The foot of "Apatosaurus" has three claws on the innermost digits; the digit formula is 3-4-5-3-2. The first metatarsal is the stoutest, a feature shared among diplodocids.
Discovery and species.
Initial discovery.
The first "Apatosaurus" fossils were discovered by Arthur Lakes, a local miner, and his friend Henry C. Beckwith in the spring of 1877 in Morrison, a town in the eastern foothills of the Rocky Mountains in Jefferson County, Colorado. Arthur Lakes wrote to Othniel Charles Marsh, Professor of Paleontology at Yale University, and Edward Drinker Cope, a paleontologist based in Philadelphia, about the discovery until eventually collecting several fossils and sending them to both paleontologists. Marsh named "Atlantosaurus montanus" based on some of the fossils sent and hired Lakes to collect the rest of the material at Morrison and send it to Yale, while Cope attempted to hire Lakes as well but was rejected. One of the best specimens collected by Lakes in 1877 was a well preserved partial postcranial skeleton, including many vertebrae, and a partial braincase (YPM VP 1860), which was sent to Marsh and named "Apatosaurus ajax" in November 1877. The composite term "Apatosaurus" comes from the Greek words ' ()/' () meaning "deception"/"deceptive", and "" () meaning "lizard"; thus, "deceptive lizard". Marsh gave it this name based on the chevron bones, which are dissimilar to those of other dinosaurs; instead, the chevron bones of "Apatosaurus" showed similarities with those of mosasaurs, most likely that of the representative species "Mosasaurus". By the end of excavations at Lakes' quarry in Morrison, several partial specimens of "Apatosaurus" had been collected, but only the type specimen of "A. ajax" can be confidently referred to the species.
During excavation and transportation, the bones of the holotype skeleton were mixed with those of another Apatosaurine individual originally described as "Atlantosaurus immanis"; as a consequence, some elements cannot be ascribed to either specimen with confidence. Marsh distinguished the new genus "Apatosaurus" from "Atlantosaurus" on the basis of the number of sacral vertebrae, with "Apatosaurus" possessing three and "Atlantosaurus" four. Recent research shows that traits usually used to distinguish taxa at this time were actually widespread across several taxa, causing many of the taxa named to be invalid, like "Atlantosaurus". Two years later, Marsh announced the discovery of a larger and more complete specimen (YPM VP 1980) from Como Bluff, Wyoming, he gave this specimen the name "Brontosaurus excelsus". Also at Como Bluff, the Hubbell brothers working for Edward Drinker Cope collected a tibia, fibula, scapula, and several caudal vertebrae along with other fragments belonging to "Apatosaurus" in 1877–78 at Cope's Quarry 5 at the site. Later in 1884, Othniel Marsh named "Diplodocus lacustris" based on a chimeric partial dentary, snout, and several teeth collected by Lakes in 1877 at Morrison. In 2013, it was suggested that the dentary of "D. lacustris" and its teeth were actually from "Apatosaurus ajax" based on its proximity to the type braincase of "A. ajax". All specimens currently considered "Apatosaurus" were from the Morrison Formation, the location of the excavations of Marsh and Cope.
Second Dinosaur Rush and skull issue.
After the end of the Bone Wars, many major institutions in the eastern United States were inspired by the depictions and finds by Marsh and Cope to assemble their own dinosaur fossil collections. The competition to mount the first sauropod skeleton specifically was the most intense, with the American Museum of Natural History, Carnegie Museum of Natural History, and Field Museum of Natural History all sending expeditions to the west to find the most complete sauropod specimen, bring it back to the home institution, and mount it in their fossil halls. The American Museum of Natural History was the first to launch an expedition, finding a well preserved skeleton (AMNH 460), which is occasionally assigned to "Apatosaurus", is considered nearly complete; only the head, feet, and sections of the tail are missing, and it was the first sauropod skeleton mounted. The specimen was found north of Medicine Bow, Wyoming, in 1898 by Walter Granger, and took the entire summer to extract. To complete the mount, sauropod feet that were discovered at the same quarry and a tail fashioned to appear as Marsh believed it shouldbut which had too few vertebraewere added. In addition, a sculpted model of what the museum thought the skull of this massive creature might look like was made. This was not a delicate skull like that of "Diplodocus"which was later found to be more accuratebut was based on "the biggest, thickest, strongest skull bones, lower jaws and tooth crowns from three different quarries". These skulls were likely those of "Camarasaurus", the only other sauropod for which good skull material was known at the time. The mount construction was overseen by Adam Hermann, who failed to find "Apatosaurus" skulls. Hermann was forced to sculpt a stand-in skull by hand. Osborn said in a publication that the skull was "largely conjectural and based on that of "Morosaurus"" (now "Camarasaurus").
In 1903, Elmer Riggs published a study that described a well-preserved skeleton of a diplodocid from the Grand River Valley near Fruita, Colorado, Field Museum of Natural History specimen P25112. Riggs thought that the deposits were similar in age to those of the Como Bluff in Wyoming from which Marsh had described "Brontosaurus". Most of the skeleton was found, and after comparison with both "Brontosaurus" and "Apatosaurus ajax", Riggs realized that the holotype of "A.ajax" was immature, and thus the features distinguishing the genera were not valid. Since "Apatosaurus" was the earlier name, "Brontosaurus" should be considered a junior synonym of "Apatosaurus". Because of this, Riggs recombined "Brontosaurus excelsus" as "Apatosaurus excelsus". Based on comparisons with other species proposed to belong to "Apatosaurus", Riggs also determined that the Field Columbian Museum specimen was likely most similar to "A.excelsus".
Despite Riggs' publication, Henry Fairfield Osborn, who was a strong opponent of Marsh and his taxa, labeled the "Apatosaurus" mount of the American Museum of Natural History "Brontosaurus". Because of this decision the name "Brontosaurus" was commonly used outside of scientific literature for what Riggs considered "Apatosaurus", and the museum's popularity meant that "Brontosaurus" became one of the best known dinosaurs, even though it was invalid throughout nearly all of the 20th and early 21st centuries.
It was not until 1909 that an "Apatosaurus" skull was found during the first expedition, led by Earl Douglass, to what would become known as the Carnegie Quarry at Dinosaur National Monument. The skull was found a short distance from a skeleton (specimen CM3018) identified as the new species "Apatosaurus louisae", named after Louise Carnegie, wife of Andrew Carnegie, who funded field research to find complete dinosaur skeletons in the American West. The skull was designated CM11162; it was very similar to the skull of "Diplodocus". Another smaller skeleton of "A.louisae" was found nearby CM11162 and CM3018. The skull was accepted as belonging to the "Apatosaurus" specimen by Douglass and Carnegie Museum director William H. Holland, although other scientistsmost notably Osbornrejected this identification. Holland defended his view in 1914 in an address to the Paleontological Society of America, yet he left the Carnegie Museum mount headless. While some thought Holland was attempting to avoid conflict with Osborn, others suspected Holland was waiting until an articulated skull and neck were found to confirm the association of the skull and skeleton. After Holland's death in 1934, museum staff placed a cast of a "Camarasaurus" skull on the mount.
While most other museums were using cast or sculpted "Camarasaurus" skulls on "Apatosaurus" mounts, the Yale Peabody Museum decided to sculpt a skull based on the lower jaw of a "Camarasaurus", with the cranium based on Marsh's 1891 illustration of the skull. The skull also included forward-pointing nasalssomething unusual for any dinosaurand fenestrae differing from both the drawing and other skulls.
No "Apatosaurus" skull was mentioned in literature until the 1970s when John Stanton McIntosh and David Berman redescribed the skulls of "Diplodocus" and "Apatosaurus". They found that though he never published his opinion, Holland was almost certainly correct, that "Apatosaurus" had a "Diplodocus"-like skull. According to them, many skulls long thought to pertain to "Diplodocus" might instead be those of "Apatosaurus". They reassigned multiple skulls to "Apatosaurus" based on associated and closely associated vertebrae. Even though they supported Holland, it was noted that "Apatosaurus" might have possessed a "Camarasaurus"-like skull, based on a disarticulated "Camarasaurus"-like tooth found at the precise site where an "Apatosaurus" specimen was found years before. On October20, 1979, after the publications by McIntosh and Berman, the first true skull of "Apatosaurus" was mounted on a skeleton in a museum, that of the Carnegie. In 1998, it was suggested that the Felch Quarry skull that Marsh had included in his 1896 skeletal restoration instead belonged to "Brachiosaurus". This was supported in 2020 with a redescription of the brachiosaurid material found at the Felch Quarry.
Recent discoveries and reassessment.
In 2011, the first specimen of "Apatosaurus" where a skull was found articulated with its cervical vertebrae was described. This specimen, CMCVP7180, was found to differ in both skull and neck features from "A.louisae", but shared many features of the cervical vertebrae with "A.ajax". Another well-preserved skull is Brigham Young University specimen 17096, a well-preserved skull and skeleton, with a preserved braincase. The specimen was found in Cactus Park Quarry in western Colorado. In 2013, Matthew Mossbrucker and several other authors published an abstract that described a premaxilla and maxilla from Lakes' original quarry in Morrison and referred the material to "Apatosaurus ajax."
Almost all modern paleontologists agreed with Riggs that the two dinosaurs should be classified together in a single genus. According to the rules of the ICZN (which governs the scientific names of animals), the name "Apatosaurus", having been published first, has priority as the official name; "Brontosaurus" was considered a junior synonym and was therefore long discarded from formal use. Despite this, at least one paleontologistRobert T. Bakkerargued in the 1990s that "A.ajax" and "A.excelsus" were in fact sufficiently distinct for the latter to merit a separate genus.
In 2015, Emanuel Tschopp, Octávio Mateus, and Roger Benson released a paper on diplodocoid systematics, and proposed that genera could be diagnosed by thirteen differing characters, and species separated based on six. The minimum number for generic separation was chosen based on the fact that "A.ajax" and "A.louisae" differ in twelve characters, and "Diplodocus carnegiei" and "D.hallorum" differ in eleven characters. Thus, thirteen characters were chosen to validate the separation of genera. The six differing features for specific separation were chosen by counting the number of differing features in separate specimens generally agreed to represent one species, with only one differing character in "D.carnegiei" and "A.louisae", but five differing features in "B.excelsus". Therefore, Tschopp etal. argued that "Apatosaurus excelsus", originally classified as "Brontosaurus excelsus", had enough morphological differences from other species of "Apatosaurus" that it warranted being reclassified as a separate genus again. The conclusion was based on a comparison of 477 morphological characteristics across 81 different dinosaur individuals. Among the many notable differences are the widerand presumably strongerneck of "Apatosaurus" species compared to "B.excelsus". Other species previously assigned to "Apatosaurus", such as "Elosaurus parvus" and "Eobrontosaurus yahnahpin" were also reclassified as "Brontosaurus". Some features proposed to separate "Brontosaurus" from "Apatosaurus" include: posterior dorsal vertebrae with the centrum longer than wide; the scapula rear to the acromial edge and the distal blade being excavated; the acromial edge of the distal scapular blade bearing a rounded expansion; and the ratio of the proximodistal length to transverse breadth of the astragalus 0.55 or greater. Sauropod expert Michael D'Emic pointed out that the criteria chosen were to an extent arbitrary and that they would require abandoning the name "Brontosaurus" again if newer analyzes obtained different results. Mammal paleontologist Donald Prothero criticized the mass media reaction to this study as superficial and premature, concluding that he would keep "Brontosaurus" in quotes and not treat the name as a valid genus.
Valid species.
Many species of "Apatosaurus" have been designated from scant material. Marsh named as many species as he could, which resulted in many being based upon fragmentary and indistinguishable remains. In 2005, Paul Upchurch and colleagues published a study that analyzed the species and specimen relationships of "Apatosaurus". They found that "A.louisae" was the most basal species, followed by FMNHP25112, and then a polytomy of "A.ajax", "A.parvus", and "A.excelsus". Their analysis was revised and expanded with many additional diplodocid specimens in 2015, which resolved the relationships of "Apatosaurus" slightly differently, and also supported separating "Brontosaurus" from "Apatosaurus".
The cladogram below is the result of an analysis by Tschopp, Mateus, and Benson (2015). The authors analyzed most diplodocid type specimens separately to deduce which specimen belonged to which species and genus.
Classification.
"Apatosaurus" is a member of the family Diplodocidae, a clade of gigantic sauropod dinosaurs. The family includes some of the longest creatures ever to walk the earth, including "Diplodocus", "Supersaurus", and "Barosaurus". "Apatosaurus" is sometimes classified in the subfamily Apatosaurinae, which may also include "Suuwassea", "Supersaurus", and "Brontosaurus". Othniel Charles Marsh described "Apatosaurus" as allied to "Atlantosaurus" within the now-defunct group Atlantosauridae. In 1878, Marsh raised his family to the rank of suborder, including "Apatosaurus", "Atlantosaurus", "Morosaurus" (="Camarasaurus") and "Diplodocus". He classified this group within Sauropoda, a group he erected in the same study. In 1903, Elmer S. Riggs said the name Sauropoda would be a junior synonym of earlier names; he grouped "Apatosaurus" within Opisthocoelia. Sauropoda is still used as the group name. In 2011, John Whitlock published a study that placed "Apatosaurus" a more basal diplodocid, sometimes less basal than "Supersaurus".
Cladogram of the Diplodocidae after Tschopp, Mateus, and Benson (2015).
Paleobiology.
It was believed throughout the 19th and early 20th centuries that sauropods like "Apatosaurus" were too massive to support their own weight on dry land. It was theorized that they lived partly submerged in water, perhaps in swamps. More recent findings do not support this; sauropods are now thought to have been fully terrestrial animals. A study of diplodocid snouts showed that the square snout, large proportion of pits, and fine, subparallel scratches of the teeth of "Apatosaurus" suggests it was a ground-height, nonselective browser. It may have eaten ferns, cycadeoids, seed ferns, horsetails, and algae. Stevens and Parish (2005) speculate that these sauropods fed from riverbanks on submerged water plants.
A 2015 study of the necks of "Apatosaurus" and "Brontosaurus" found many differences between them and other diplodocids, and that these variations may have shown that the necks of "Apatosaurus" and "Brontosaurus" were used for intraspecific combat. Various uses for the single claw on the forelimb of sauropods have been proposed. One suggestion is that they were used for defense, but their shape and size make this unlikely. It was also possible they were for feeding, but the most probable use for the claw was grasping objects such as tree trunks when rearing.
Trackways of sauropods like "Apatosaurus" show that they may have had a range of around per day, and that they could potentially have reached a top speed of per hour. The slow locomotion of sauropods may be due to their minimal muscling, or to recoil after strides. A trackway of a juvenile has led some to believe that they were capable of bipedalism, though this is disputed.
Neck posture.
Diplodocids like "Apatosaurus" are often portrayed with their necks held high up in the air, allowing them to browse on tall trees. Some studies state diplodocid necks were less flexible than previously believed, because the structure of the neck vertebrae would not have allowed the neck to bend far upward, and that sauropods like "Apatosaurus" were adapted to low browsing or ground feeding.
Other studies by Taylor find that all tetrapods appear to hold their necks at the maximum possible vertical extension when in a normal, alert posture; they argue the same would hold true for sauropods barring any unknown, unique characteristics that set the soft tissue anatomy of their necks apart from that of other animals. "Apatosaurus", like "Diplodocus", would have held its neck angled upward with the head pointing downward in a resting posture. Kent Stevens and Michael Parrish (1999 and 2005) state "Apatosaurus" had a great feeding range; its neck could bend into a U-shape laterally. The neck's range of movement would have also allowed the head to feed at the level of the feet.
Matthew Cobley "et al." (2013) dispute this, finding that large muscles and cartilage would have limited movement of the neck. They state the feeding ranges for sauropods like "Diplodocus" were smaller than previously believed, and the animals may have had to move their whole bodies around to better access areas where they could browse vegetation. As such, they might have spent more time foraging to meet their minimum energy needs. The conclusions of Cobley "etal." are disputed by Taylor, who analyzed the amount and positioning of intervertebral cartilage to determine the flexibility of the neck of "Apatosaurus" and "Diplodocus". He found that the neck of "Apatosaurus" was very flexible.
Physiology.
Given the large body mass and long neck of sauropods like "Apatosaurus", physiologists have encountered problems determining how these animals breathed. Beginning with the assumption that, like crocodilians, "Apatosaurus" did not have a diaphragm, the dead-space volume (the amount of unused air remaining in the mouth, trachea, and air tubes after each breath) has been estimated at for a specimen. Paladino calculates its tidal volume (the amount of air moved in or out during a single breath) at with an avian respiratory system, if mammalian, and if reptilian.
On this basis, its respiratory system would likely have been parabronchi, with multiple pulmonary air sacs as in avian lungs, and a flow-through lung. An avian respiratory system would need a lung volume of about compared with a mammalian requirement of , which would exceed the space available. The overall thoracic volume of "Apatosaurus" has been estimated at , allowing for a , four-chambered heart and a lung capacity. That would allow about for the necessary tissue. Evidence for the avian system in "Apatosaurus" and other sauropods is also present in the pneumaticity of the vertebrae. Though this plays a role in reducing the weight of the animal, Wedel (2003) states they are also likely connected to air sacs, as in birds.
James Spotila "et al." (1991) concludes that the large body size of sauropods would have made them unable to maintain high metabolic rates because they would not have been able to release enough heat. They assumed sauropods had a reptilian respiratory system. Wedel says that an avian system would have allowed it to dump more heat. Some scientists state that the heart would have had trouble sustaining sufficient blood pressure to oxygenate the brain. Others suggest that the near-horizontal posture of the head and neck would have eliminated the problem of supplying blood to the brain because it would not have been elevated.
James Farlow (1987) calculates that an "Apatosaurus"-sized dinosaur about would have possessed of fermentation contents, though he cautions that the regression equation being used is based on living mammals which are much smaller and physiologically different. Assuming "Apatosaurus" had an avian respiratory system and a reptilian resting-metabolism, Frank Paladino etal. (1997) estimate the animal would have needed to consume only about of water per day.
Growth.
A 1999 microscopic study of "Apatosaurus" and "Brontosaurus" bones concluded the animals grew rapidly when young and reached near-adult sizes in about 10years. In 2008, a study on the growth rates of sauropods was published by Thomas Lehman and Holly Woodward. They said that by using growth lines and length-to-mass ratios, "Apatosaurus" would have grown to 25t (25 long tons; 28 short tons) in 15years, with growth peaking at in a single year. An alternative method, using limb length and body mass, found "Apatosaurus" grew per year, and reached its full mass before it was about 70years old. These estimates have been called unreliable because the calculation methods are not sound; old growth lines would have been obliterated by bone remodeling. One of the first identified growth factors of "Apatosaurus" was the number of sacral vertebrae, which increased to five by the time of the creature's maturity. This was first noted in 1903 and again in 1936.
Long-bone histology enables researchers to estimate the age that a specific individual reached. A study by Eva Griebeler etal. (2013) examined long-bone histological data and concluded the "Apatosaurus" sp.SMA0014 weighed , reached sexual maturity at 21years, and died aged 28. The same growth model indicated "Apatosaurus" sp.BYU 601–17328 weighed , reached sexual maturity at 19years, and died aged 31.
Juveniles.
Compared with most sauropods, a relatively large amount of juvenile material is known from "Apatosaurus". Multiple specimens in the OMNH are from juveniles of an undetermined species of "Apatosaurus"; this material includes partial shoulder and pelvic girdles, some vertebrae, and limb bones. OMNH juvenile material is from at least two different age groups and based on overlapping bones likely comes from more than three individuals. The specimens exhibit features that distinguish "Apatosaurus" from its relatives, and thus likely belong to the genus. Juvenile sauropods tend to have proportionally shorter necks and tails, and a more pronounced forelimb-hindlimb disparity than found in adult sauropods.
Tail.
The estimated tail length of "Apatosaurus" is approximately 54% of the total body length, with the tail sometimes hypothesized to be capable of functioning like a very long, tapering bullwhip. An article published in 1997 reported research of the mechanics of "Apatosaurus" tails through computer simulation by Nathan Myhrvold and paleontologist Philip J. Currie. This computer modeling suggested diplodocids were capable of producing a whiplike cracking sound of over 200 decibels, comparable to the volume of a cannon being fired.
A pathology has been identified on the tail of "Apatosaurus", caused by a growth defect. Two caudal vertebrae are seamlessly fused along the entire articulating surface of the bone, including the arches of the neural spines. This defect might have been caused by the lack or inhibition of the substance that forms intervertebral disks or joints. It has been proposed that the whips could have been used in combat and defense, but the tails of diplodocids were quite light and narrow compared to "Shunosaurus" and mamenchisaurids, and thus to injure another animal with the tail would severely injure the tail itself. More recently, Baron (2020) considers the use of the tail as a bullwhip unlikely because of the potentially catastrophic muscle and skeletal damage such speeds could cause on the large and heavy tail. Instead, he proposes that the tails might have been used as a tactile organ to keep in touch with the individuals behind and on the sides in a group while migrating, which could have augmented cohesion and allowed communication among individuals while limiting more energetically demanding activities like stopping to search for dispersed individuals, turning to visually check on individuals behind, or communicating vocally.
Paleoecology.
The Morrison Formation is a sequence of shallow marine and alluvial sediments which, according to radiometric dating, dates from between 156.3mya at its base, and 146.8mya at the top, placing it in the late Oxfordian, Kimmeridgian, and early Tithonian stages of the Late Jurassic period. This formation is interpreted as originating in a locally semiarid environment with distinct wet and dry seasons. The Morrison Basin, where dinosaurs lived, stretched from New Mexico to Alberta and Saskatchewan; it was formed when the precursors to the Front Range of the Rocky Mountains started pushing up to the west. The deposits from their east-facing drainage basins were carried by streams and rivers and deposited in swampy lowlands, lakes, river channels, and floodplains. This formation is similar in age to the Lourinhã Formation in Portugal and the Tendaguru Formation in Tanzania.
"Apatosaurus" was the second most common sauropod in the Morrison Formation ecosystem, after "Camarasaurus". "Apatosaurus" may have been more solitary than other Morrison Formation dinosaurs. Fossils of the genus have only been found in the upper levels of the formation. Those of "Apatosaurus ajax" are known exclusively from the upper Brushy Basin Member, about 152–151 mya. "A.louisae" fossils are rare, known only from one site in the upper Brushy Basin Member; they date to the late Kimmeridgian stage, about 151mya. Additional "Apatosaurus" remains are known from similarly aged or slightly younger rocks, but they have not been identified as any particular species, and thus may instead belong to "Brontosaurus".
The Morrison Formation records a time when the local environment was dominated by gigantic sauropod dinosaurs. Dinosaurs known from the Morrison Formation include the theropods "Allosaurus", "Ceratosaurus", "Ornitholestes", and "Torvosaurus"; the sauropods "Brontosaurus", "Brachiosaurus", "Camarasaurus", and "Diplodocus"; and the ornithischians "Camptosaurus", "Dryosaurus", and "Stegosaurus". "Apatosaurus" is commonly found at the same sites as "Allosaurus", "Camarasaurus", "Diplodocus", and "Stegosaurus". "Allosaurus" accounted for 70–75% of theropod specimens and was at the top trophic level of the Morrison food web. Many of the dinosaurs of the Morrison Formation are of the same genera as those seen in Portuguese rocks of the Lourinhã Formationmainly "Allosaurus", "Ceratosaurus", and "Torvosaurus"or have a close counterpart"Brachiosaurus" and "Lusotitan", "Camptosaurus" and "Draconyx", and "Apatosaurus" and "Dinheirosaurus". Other vertebrates that are known to have shared this paleo-environment include ray-finned fishes, frogs, salamanders, turtles, sphenodonts, lizards, terrestrial and aquatic crocodylomorphs, and several species of pterosaur. Shells of bivalves and aquatic snails are also common. The flora of the period has been evidenced in fossils of green algae, fungi, mosses, horsetails, cycads, ginkgoes, and several families of conifers. Vegetation varied from river-lining forests of tree ferns with fern understory (gallery forests), to fern savannas with occasional trees such as the "Araucaria"-like conifer "Brachyphyllum".
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Allosaurus
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Allosaurus ( ) is an extinct genus of theropod dinosaur that lived 155 to 145 million years ago during the Late Jurassic period (Kimmeridgian to late Tithonian ages). The first fossil remains that could definitively be ascribed to this genus were described in 1877 by Othniel C. Marsh. The name "Allosaurus" means "different lizard", alluding to its lightweight , which Marsh believed were unique. The genus has a very complicated taxonomy and includes at least three valid species, the best known of which is "A. fragilis". The bulk of "Allosaurus" remains come from North America's Morrison Formation, with material also known from the Alcobaça, Bombarral, and Lourinhã formations in Portugal. It was known for over half of the 20th century as "Antrodemus", but a study of the abundant remains from the Cleveland-Lloyd Dinosaur Quarry returned the name "Allosaurus" to prominence. As one of the first well-known theropod dinosaurs, it has long attracted attention outside of paleontological circles.
"Allosaurus" was a large bipedal predator for its time. Its skull was light, robust, and equipped with dozens of sharp, serrated teeth. It averaged in length for "A. fragilis", with the largest specimens estimated as being long. Relative to the large and powerful legs, its three-fingered hands were small and the body was balanced by a long, muscular tail. It is classified in the family Allosauridae. As the most abundant large predator of the Morrison Formation, "Allosaurus" was at the top of the food chain and probably preyed on large herbivorous dinosaurs such as ornithopods, stegosaurids, and sauropods. Scientists have debated whether "Allosaurus" had cooperative social behavior and hunted in packs or was a solitary predator that forms congregations, with evidence supporting either side.
History of discovery.
Initial finds and naming of "Allosaurus".
The discovery and early study of "Allosaurus" is complicated by the multiplicity of names coined during the Bone Wars of the late 19th century. The first described fossil in this history was a bone obtained secondhand by Ferdinand V. Hayden in 1869. It came from Middle Park, near Granby, Colorado, probably from Morrison Formation rocks. The locals had identified such bones as "petrified horse hoofs". Hayden sent his specimen to Joseph Leidy, who identified it as half of a tail vertebra and tentatively assigned it to the European dinosaur genus "Poekilopleuron" as "Poicilopleuron" "valens". He later decided it deserved its own genus, "Antrodemus".
"Allosaurus" itself is based on YPM 1930, a small collection of fragmentary bones including parts of three vertebrae, a rib fragment, a tooth, a toe bone, and the shaft of the right (upper arm bone). Othniel Charles Marsh gave these remains the name "Allosaurus fragilis" in 1877. "Allosaurus" comes from the Greek words "/", meaning "strange" or "different", and "/", meaning "lizard" or "reptile". Marsh chose the name 'different lizard' because he believed that the vertebrae were different from those of other dinosaurs due to their lightweight construction. The species epithet "fragilis" is Latin for "fragile", again referring to the lightening features in the vertebrae. The bones were collected from the Morrison Formation of Garden Park, north of Cañon City. Marsh and Edward Drinker Cope, who were in scientific competition with each other, went on to coin several other genera based on similarly sparse material that are now thought to be synonyms of "Allosaurus". These include Marsh's "Creosaurus" and "Labrosaurus", as well as Cope's "Epanterias".
In their haste, Cope and Marsh did not always follow up on their discoveries (or, more commonly, those made by their subordinates). For example, after the discovery by Benjamin Mudge of the holotype specimen of "Allosaurus" in Colorado, Marsh elected to concentrate work in Wyoming. When work resumed at Garden Park in 1883, M. P. Felch found an almost complete "Allosaurus" and several partial skeletons. In addition, one of Cope's collectors, H. F. Hubbell, found a specimen in the Como Bluff area of Wyoming in 1879, but apparently did not mention its completeness and Cope never unpacked it. Upon unpacking it in 1903 (several years after Cope had died), it was found to be one of the most complete theropod specimens then known and the skeleton, now cataloged as AMNH 5753, was put on public view in 1908. This is the well-known mount poised over a partial "Apatosaurus" skeleton as if scavenging it, illustrated as such in a painting by Charles R. Knight. Although notable as the first free-standing mount of a theropod dinosaur and often illustrated and photographed, it has never been scientifically described.
Renaming to "Antrodemus" and early discoveries at Dinosaur National Monument.
The many names coined by Cope and Marsh complicated later research, with the situation further compounded by the terse descriptions they provided. Even at the time, authors such as Samuel W. Williston suggested that too many names had been coined. For example, Williston pointed out in 1901 that Marsh had never been able to adequately distinguish "Allosaurus" from "Creosaurus". The most influential early attempt to sort out the situation was produced by Charles W. Gilmore in 1920. He came to the conclusion that the tail vertebra named "Antrodemus" by Leidy was indistinguishable from those of "Allosaurus" and that "Antrodemus" should be the preferred name because, as the older name, it had priority. "Antrodemus" became the accepted name for this familiar genus for over 50 years, until James H. Madsen published on the Cleveland-Lloyd specimens and concluded that "Allosaurus" should be used because "Antrodemus" was based on material with poor, if any, diagnostic features and locality information. For example, the geological formation that the single bone of "Antrodemus" came from is unknown.
Marsh had named two additional "Allosaurus" species, "A. medius" and "A. lucaris". "A. medius" was named in 1888 for various specimens from the Early Cretaceous Arundel Formation of Maryland, although most of the remains were removed by Richard Swann Lull to the new ornithopod species "Dryosaurus grandis", restricting the species to a single tooth. This tooth was later transferred to "Dryptosaurus" but is now thought to be an indeterminate theropod. "A. lucaris" was given to a partial skeleton in 1878. Marsh later decided it warranted its own genus, "Labrosaurus", but this has not been accepted, and "A. lucaris" is regarded as another specimen of "A. fragilis".
In 1909, Earl Douglass from the Carnegie Museum discovered what should later become Dinosaur National Monument in Utah. Until 2022, Douglass and his team excavated over of fossils of multiple dinosaur species from a single quarry, including several "Allosaurus" specimens. Among these finds is CM 11844, which was collected between 1913 and 1915 and comprises much of the skeleton and a fragmentary skull. Since 1938, this skeleton is on display at the Carnegie Museum. During the summer of 1924, the University of Utah uncovered DINO 2560, the best preserved "Allosaurus" specimen known at that time. The skull of this particularly large individual is on exhibit at the Dinosaur National Monument.
Cleveland-Lloyd discoveries and "Big Al".
Although sporadic work at what became known as Utah's Cleveland-Lloyd Dinosaur Quarry had taken place as early as 1927 and the fossil site itself was described by William L. Stokes in 1945, major operations did not begin there until 1960. Madsen led a cooperative effort between 1960 and 1965 involving nearly 40 institutions, during which thousands of bones were recovered from the site. The quarry is notable for the predominance of "Allosaurus" remains: the quarry preserves a minimum of 73 individual dinosaurs and at least 46 of those are "A. fragilis". The great quantity of well-preserved "Allosaurus" remains has allowed this genus to be known in great detail, making it among the best-known of all theropods. Skeletal remains from the quarry pertain to individuals of almost all ages and sizes, from less than to long. Because its fossils are common at both this quarry and others in the state, "Allosaurus" was designated as the state fossil of Utah in 1988.
In the early 1990s, a Swiss team led by Kirby Siber set out for commercial fossil excavations at Howe Ranch Quarry, Wyoming. This quarry had originally been worked on in 1934 by Barnum Brown and his crew, who collected more than 30 tons of bones, mostly of sauropods. Because the Swiss team could not locate additional specimens in the quarry, they explored the surrounding area, where they discovered "Big Al" (MOR 693) in 1991: a 95% complete, partially articulated "Allosaurus" specimen. However, because the new site was located on public land, the excavation was taken over by a joint Museum of the Rockies and University of Wyoming Geological Museum team. The specimen, now on exhibit at the Museum of the Rockies, belonged to an individual of about in length. This was below the average size for "Allosaurus", as it was a subadult estimated at only 87% grown. The Swiss team later excavated a second "Allosaurus", "Big Al II" (SMA 0005), on private land on Howe Ranch, which is exhibited at the Aathal Dinosaur Museum in Switzerland.
In 1991, Brooks Britt argued that there were at least two species of "Allosaurus": A robust species with a short and high skull and pointed lacrimal horns, and a more gracile species with a long and low skull and rounded lacrimal horns. The robust species is geologically younger from localities such as Dry Mesa Quarry and Garden Park, while the gracile species, found at the Cleveland-Lloyd and at Dinosaur National Monument, is older. Already in 1988, Gregory S. Paul made a similar distinction in a popular book, in which he referred to the gracile species as "A. fragilis" and to the robust species as "A. atrox", using a species originally described by Marsh as "Creosaurus atrox". However, a series of statistical analyses by David K. Smith between 1996 and 1999 suggested that the differences seen in the Morrison Formation material can be attributed to individual variation.
"Epanterias".
Epanterias was described by Edward Drinker Cope in 1878 with type species "Epanterias amplexus". This genus is based on what is now AMNH 5767, parts of three vertebrae, a coracoid, and a metatarsal. Although Cope thought it was a sauropod, it was later shown to be a theropod. Gregory S. Paul reassessed the material as pertaining to a large species of "Allosaurus" in 1988 (which he classified as "Allosaurus amplexus"). Other authors have gone further and considered "E. amplexus" as simply a large individual of "Allosaurus fragilis". In 2010, Gregory S. Paul and Kenneth Carpenter noted that the "E. amplexus" specimen comes from higher in the Morrison Formation than the type specimen of "Allosaurus fragilis", and is therefore "probably a different taxon". They also considered its holotype specimen undiagnostic and classified it as a "nomen dubium".
The generic epithet translates to "buttressed" in Greek, in reference to the vertebrae. The word "amplexus" refers to the copulatory position of amphibians in which males clasp their mates. Therefore, the specific epithet means "clasping buttressed vertebrae" in Latin.
Portuguese discoveries.
"Allosaurus" is known from at least three localities in Portugal, from rocks of the Lourinhã, Bombarral, and Alcobaça formations. The first specimen (MNHNUL/AND.001), a partial skeleton that includes an articulated hindlimb and pelvis, was found in 1988 near the village of Andrés in the District of Leiria during the construction of a warehouse. Reported in 1999 and assigned to the species "A. fragilis", it was the first "Allosaurus" specimen to be found outside of North America. "A. fragilis" became the first dinosaur species known from both Europe and North America, suggesting faunal exchange between the two continents. This site has been worked on again between 2005 and 2010, resulting in the discovery of at least two more "Allosaurus" individuals, including many skull bones. In 2005, a single maxilla was reported from the Guimarota coal mine, a locality well-known for its fossils of Mesozoic mammals; this fossil was assigned to "Allosaurus" but not to any particular species.
In 2006, Octávio Mateus and colleagues reported a partial skull and three neck vertebrae (ML 415) from the Vale Frades beach in Lourinhã. As this specimen differed from North American "Allosaurus" fossils, they assigned it to a new species, "A. europaeus". These authors also assigned the Andrés specimen to this species, though solely based on the fact that it was found in Portugal. The presence of a separate "Allosaurus" species in Europe would suggest that faunal interchange between the continents was interrupted, possibly due to the opening of the Atlantic Ocean. The status of "A. europaeus" was controversially discussed in the subsequent years, with different studies arguing that the species is a synonym of "A. fragilis", a "nomen dubium" (doubtful name), or in need of re-evaluation. In 2024, André Burigo and Mateus re-described the Vale Frades specimen and carried out further fossil preparation that exposed additional bones. These authors identified nine unique features supporting the validity "A. europaeus". A 2025 study by Elisabete Malafaia and colleagues described the Andrés specimens in detail, including a newly discovered set of skull bones. Their analysis of the relationships between individual "Allosaurus" skulls instead suggested that "A. europaeus" is a synonym of "A. fragilis" because the Andrés specimens were more closely related to some North American specimens than to the Vale Frades specimen.
"A. jimmadseni" and "A. anax".
On July 15, 1990, George Engelmann discovered toe bones and some tail vertebrae weathering out of the rock while conducting an inventory of fossils at Dinosaur National Monument. Staff of the National Monument began excavating the new specimen later that year; the conditions where difficult because of its location in a steeply inclined rock face that, with ongoing excavation, became vertical. In 1994, much of the excavated skeleton was flown out via helicopter in single block weighing . The skull, which was still missing, was only located two years later, in 1996, with the help of novel radiological surveying techniques that detect gamma radiation from radioactive minerals which accumulate in bones during fossilization. The specimen, DINO 11541, is one of the most complete theropod skeletons recovered from the Late Jurassic. In 2000, Daniel Chure described the specimen in his PhD thesis, arguing that it represents a new species, "A. jimmadseni". However, as the thesis did not meet the requirements of the International Commission on Zoological Nomenclature (ICZN), it remained an invalid "nomen nudum" ("naked name") until Chure and Mark Loewen formally described the species in 2020. These authors assigned several other specimens to "A. jimmadseni", including the original "Big Al" individual (MOR 693). The name "jimmadseni" honors Madsen for his contributions to the taxonomy of the genus, notably his 1976 work.
The issue of species and potential synonyms was historically complicated by the type specimen of "Allosaurus fragilis" (YPM 1930) being extremely fragmentary. Because of this, several scientists have interpreted the type specimen as potentially dubious, meaning the genus "Allosaurus" itself or at least the species "A. fragilis" would be a "nomen dubium" ("dubious name", based on a specimen too incomplete to compare to other specimens or to classify). To address this situation, Gregory S. Paul and Kenneth Carpenter (2010) submitted a petition to the ICZN to have the name "A. fragilis" officially transferred to the more complete specimen USNM 4734 (as a neotype), a decision that was ratified by the ICZN on December 29, 2023.
In 1995, Chure created the taxon "Saurophaganax maximus" for giant allosaurid remains from western Oklahoma. These remains had been known as "Saurophagus", but that name was already in use, leading Chure to propose a substitute. Smith, in his 1998 analysis of variation, concluded that "S. maximus" was not different enough from "Allosaurus" to be a separate genus, but did warrant its own species, "A. maximus". This reassignment was rejected in a review of basal tetanurans. A 2024 reassessment by Andy Danison and colleagues suggested that the "Saurophaganax" specimen is a chimera that combines the bones of "Allosaurus" with those of a sauropod. The holotype of "Saurophaganax" itself, a neural arch, cannot be confidently be assigned to a theropod, making it a "nomen dubium". The "Allosaurus" bones, however, were found to be distinct enough to warrant a new species of "Allosaurus", "A. anax". The name is Greek for , and also alludes to the name change from "Saurophagus" to "Saurophaganax".
Description.
"Allosaurus" was a typical large theropod, having a massive skull on a short neck, a long, slightly sloping tail, and reduced forelimbs. "Allosaurus fragilis", the best-known species, had an average length of and mass of , with the largest definitive "Allosaurus" specimen (AMNH 680) estimated at long, with an estimated weight of . In his 1976 monograph on "Allosaurus", James H. Madsen mentioned a range of bone sizes which he interpreted to show a maximum length of . As with dinosaurs in general, weight estimates are debatable, and since 1980 have ranged between , , and approximately for modal adult weight (not maximum). John Foster, a specialist on the Morrison Formation, suggests that is reasonable for large adults of "A. fragilis", but that is a closer estimate for individuals represented by the average-sized thigh bones he has measured. Using the subadult specimen nicknamed "Big Al", since assigned to the species "Allosaurus jimmadseni", researchers using computer modeling arrived at a best estimate of for the individual, but by varying parameters they found a range from approximately to approximately . A separate computational project estimated the adaptive optimum body mass in "Allosaurus" to be ~2,345 kg. "A. europaeus" has been measured up to in length and in body mass.
Several gigantic specimens have been attributed to "Allosaurus", but may in fact belong to other genera. The dubious genus "Saurophaganax" (OMNH 1708) was estimated to reach around in length, and its single species was sometimes included in the genus "Allosaurus" as "Allosaurus maximus". However, a 2024 study concluded that some material assigned to "Saurophaganax" actually belonged to a diplodocid sauropod with the material confidently assigned to Allosauridae belonging to a new species of "Allosaurus", "A. anax", and the body mass of this species was tentatively estimated around based on fragmentary material. Another potential specimen of "Allosaurus", once assigned to the genus "Epanterias" (AMNH 5767), may have measured in length. A more recent discovery is a partial skeleton from the Peterson Quarry in Morrison rocks of New Mexico; this large allosaurid was suggested to be a potential specimen of "Saurophaganax" prior to this taxon's 2024 reassessment.
David K. Smith, examining "Allosaurus" fossils by quarry, found that the Cleveland-Lloyd Dinosaur Quarry (Utah) specimens are generally smaller than those from Como Bluff (Wyoming) or Brigham Young University's Dry Mesa Quarry (Colorado), but the shapes of the bones themselves did not vary between the sites. A later study by Smith incorporating Garden Park (Colorado) and Dinosaur National Monument (Utah) specimens found no justification for multiple species based on skeletal variation; skull variation was most common and was gradational, suggesting individual variation was responsible. Further work on size-related variation again found no consistent differences, although the Dry Mesa material tended to clump together on the basis of the astragalus, an ankle bone. Kenneth Carpenter, using skull elements from the Cleveland-Lloyd site, found wide variation between individuals, calling into question previous species-level distinctions based on such features as the shape of the horns, and the proposed differentiation of "A. jimmadseni" based on the shape of the jugal. A study published by Motani et al., in 2020 suggests that "Allosaurus" was also sexually dimorphic in the width of the femur's head against its length.
Skull.
The skull and teeth of "Allosaurus" were modestly proportioned for a theropod of its size. Paleontologist Gregory S. Paul gives a length of for a skull belonging to an individual he estimates at long. Each premaxilla (the bones that formed the tip of the snout) held five teeth with D-shaped cross-sections, and each maxilla (the main tooth-bearing bones in the upper jaw) had between 14 and 17 teeth; the number of teeth does not exactly correspond to the size of the bone. Each dentary (the tooth-bearing bone of the lower jaw) had between 14 and 17 teeth, with an average count of 16. The teeth became shorter, narrower, and more curved toward the back of the skull. All of the teeth had saw-like edges. They were shed easily, and were replaced continually, making them common fossils. Its skull was light, robust and equipped with dozens of sharp, serrated teeth.
The skull had a pair of horns above and in front of the eyes. These horns were composed of extensions of the lacrimal bones, and varied in shape and size. There were also lower paired ridges running along the top edges of the nasal bones that led into the horns. The horns were probably covered in a keratin sheath and may have had a variety of functions, including acting as sunshades for the eyes, being used for display, and being used in combat against other members of the same species (although they were fragile). There was a ridge along the back of the skull roof for muscle attachment, as is also seen in tyrannosaurids.
Inside the lacrimal bones were depressions that may have held glands, such as salt glands. Within the maxillae were sinuses that were better developed than those of more basal theropods such as "Ceratosaurus" and "Marshosaurus"; they may have been related to the sense of smell, perhaps holding something like Jacobson's organs. The roof of the braincase was thin, perhaps to improve thermoregulation for the brain. The skull and lower jaws had joints that permitted motion within these units. In the lower jaws, the bones of the front and back halves loosely articulated, permitting the jaws to bow outward and increasing the animal's gape. The braincase and frontals may also have had a joint.
Postcranial skeleton.
"Allosaurus" had nine vertebrae in the neck, 14 in the back, and five in the sacrum supporting the hips. The number of tail vertebrae is unknown and varied with individual size; James Madsen estimated about 50, while Gregory S. Paul considered that to be too many and suggested 45 or less. There were hollow spaces in the neck and anterior back vertebrae. Such spaces, which are also found in modern theropods (that is, the birds), are interpreted as having held air sacs used in respiration. The rib cage was broad, giving it a barrel chest, especially in comparison to less derived theropods like "Ceratosaurus". "Allosaurus" had gastralia (belly ribs), but these are not common findings, and they may have ossified poorly. In one published case, the gastralia show evidence of injury during life. A furcula (wishbone) was also present, but has only been recognized since 1996; in some cases furculae were confused with gastralia. The ilium, the main hip bone, was massive, and the pubic bone had a prominent foot that may have been used for both muscle attachment and as a prop for resting the body on the ground. Madsen noted that in about half of the individuals from the Cleveland-Lloyd Dinosaur Quarry, independent of size, the pubes had not fused to each other at their foot ends. He suggested that this was a sexual characteristic, with females lacking fused bones to make egg-laying easier. This proposal has not attracted further attention, however.
The forelimbs of "Allosaurus" were short in comparison to the hindlimbs (only about 35% the length of the hindlimbs in adults) and had three fingers per hand, tipped with large, strongly curved and pointed claws. The arms were powerful, and the forearm was somewhat shorter than the upper arm (1:1.2 ulna/humerus ratio). The wrist had a version of the semilunate carpal also found in more derived theropods like maniraptorans. Of the three fingers, the innermost (or thumb) was the largest, and diverged from the others. The phalangeal formula is 2-3-4-0-0, meaning that the innermost finger (phalange) has two bones, the next has three, and the third finger has four. The legs were not as long or suited for speed as those of tyrannosaurids, and the claws of the toes were less developed and more hoof-like than those of earlier theropods. Each foot had three weight-bearing toes and an inner dewclaw, which Madsen suggested could have been used for grasping in juveniles. There was also what is interpreted as the splint-like remnant of a fifth (outermost) metatarsal, perhaps used as a lever between the Achilles tendon and foot.
Skin.
Skin impressions from "Allosaurus" have been described. One impression, from a juvenile specimen, measures 30 cm² and is associated with the anterior dorsal ribs/pectoral region. The impression shows small scales measuring 1–3 mm in diameter. A skin impression from the "Big Al Two" specimen, associated with the base of the tail, measures 20 cm × 20 cm and shows large scales measuring up to 2 cm in diameter. However, it has been noted that these scales are more similar to those of sauropods, and due to the presence of non-theropod remains associated with the tail of "Big Al Two" there is a possibility that this skin impression is not from "Allosaurus".
Another "Allosaurus" fossil features a skin impression from the mandible, showing scales measuring 1–2 mm in diameter. The same fossil also preserves skin measuring 20 × 20 cm from the ventral side of the neck, showing scutate scales measuring 0.5 cm wide and 11 cm long. A small skin impression from an "Allosaurus" skull has been reported but never described.
Classification.
"Allosaurus" was an allosaurid, a member of a family of large theropods within the larger group Carnosauria. The family name Allosauridae was created for this genus in 1878 by Othniel Charles Marsh, but the term was largely unused until the 1970s in favor of Megalosauridae, another family of large theropods that eventually became a wastebasket taxon. This, along with the use of "Antrodemus" for "Allosaurus" during the same period, is a point that needs to be remembered when searching for information on "Allosaurus" in publications that predate James Madsen's 1976 monograph. Major publications using the name "Megalosauridae" instead of "Allosauridae" include Gilmore, 1920, von Huene, 1926, Romer, 1956 and 1966, Steel, 1970, and Walker, 1964.
Following the publication of Madsen's influential monograph, Allosauridae became the preferred family assignment, but it too was not strongly defined. Semi-technical works used Allosauridae for a variety of large theropods, usually those that were larger and better-known than megalosaurids. Typical theropods that were thought to be related to "Allosaurus" included "Indosaurus", "Piatnitzkysaurus", "Piveteausaurus", "Yangchuanosaurus", "Acrocanthosaurus", "Chilantaisaurus", "Compsosuchus", "Stokesosaurus", and "Szechuanosaurus". Given modern knowledge of theropod diversity and the advent of cladistic study of evolutionary relationships, none of these theropods is now recognized as an allosaurid, although several, like "Acrocanthosaurus" and "Yangchuanosaurus", are members of closely related families.
Below is a cladogram based on the analysis of Benson et al. in 2010.
Allosauridae is one of four families in Allosauroidea; the other three are Neovenatoridae, Carcharodontosauridae and Sinraptoridae. Allosauridae has at times been proposed as ancestral to the Tyrannosauridae (which would make it paraphyletic), one example being Gregory S. Paul's "Predatory Dinosaurs of the World", but this has been rejected, with tyrannosaurids identified as members of a separate branch of theropods, the Coelurosauria.
Paleobiology.
Life history.
The wealth of "Allosaurus" fossils, from nearly all ages of individuals, allows scientists to study how the animal grew and how long its lifespan may have been. Remains may reach as far back in the lifespan as eggs—crushed eggs from Colorado have been suggested as those of "Allosaurus". Based on histological analysis of limb bones, bone deposition appears to stop at around 22 to 28 years, which is comparable to that of other large theropods like "Tyrannosaurus". From the same analysis, its maximum growth appears to have been at age 15, with an estimated growth rate of about 150 kilograms (330 lb) per year.
Medullary bone tissue (endosteally derived, ephemeral, mineralization located inside the medulla of the long bones in gravid female birds) has been reported in at least one "Allosaurus" specimen, a shin bone from the Cleveland-Lloyd Quarry. Today, this bone tissue is only formed in female birds that are laying eggs, as it is used to supply calcium to shells. Its presence in the "Allosaurus" individual has been used to establish sex and show it had reached reproductive age. However, other studies have called into question some cases of medullary bone in dinosaurs, including this "Allosaurus" individual. Data from extant birds suggested that the medullary bone in this "Allosaurus" individual may have been the result of a bone pathology instead. However, with the confirmation of medullary tissue indicating sex in a specimen of "Tyrannosaurus", it may be possible to ascertain whether or not the "Allosaurus" in question was indeed female.
The discovery of a juvenile specimen with a nearly complete hindlimb shows that the legs were relatively longer in juveniles, and the lower segments of the leg (shin and foot) were relatively longer than the thigh. These differences suggest that younger "Allosaurus" were faster and had different hunting strategies than adults, perhaps chasing small prey as juveniles, then becoming ambush hunters of large prey upon adulthood. The thigh bone became thicker and wider during growth, and the cross-section less circular, as muscle attachments shifted, muscles became shorter, and the growth of the leg slowed. These changes imply that juvenile legs has less predictable stresses compared with adults, which would have moved with more regular forward progression. Conversely, the skull bones appear to have generally grown isometrically, increasing in size without changing in proportion.
Feeding.
Most paleontologists accept "Allosaurus" as an active predator of large animals. There is dramatic evidence for allosaur attacks on "Stegosaurus", including an "Allosaurus" tail vertebra with a partially healed puncture wound that fits a "Stegosaurus" tail spike, and a "Stegosaurus" neck plate with a U-shaped wound that correlates well with an "Allosaurus" snout. Sauropods seem to be likely candidates as both live prey and as objects of scavenging, based on the presence of scrapings on sauropod bones fitting allosaur teeth well and the presence of shed allosaur teeth with sauropod bones. However, as Gregory Paul noted in 1988, "Allosaurus" was probably not a predator of fully grown sauropods, unless it hunted in packs, as it had a modestly sized skull and relatively small teeth, and was greatly outweighed by contemporaneous sauropods. Another possibility is that it preferred to hunt juveniles instead of fully grown adults. Research in the 1990s and the first decade of the 21st century may have found other solutions to this question. Robert T. Bakker, comparing "Allosaurus" to Cenozoic saber-toothed carnivorous mammals, found similar adaptations, such as a reduction of jaw muscles and increase in neck muscles, and the ability to open the jaws extremely wide. Although "Allosaurus" did not have saber teeth, Bakker suggested another mode of attack that would have used such neck and jaw adaptations: the short teeth in effect became small serrations on a saw-like cutting edge running the length of the upper jaw, which would have been driven into prey. This type of jaw would permit slashing attacks against much larger prey, with the goal of weakening the victim.
Similar conclusions were drawn by another study using finite element analysis on an "Allosaurus" skull. According to their biomechanical analysis, the skull was very strong but had a relatively small bite force. By using jaw muscles only, it could produce a bite force of 805 to 8,724 N, but the skull could withstand nearly 55,500 N of vertical force against the tooth row. The authors suggested that "Allosaurus" used its skull like a machete against prey, attacking open-mouthed, slashing flesh with its teeth, and tearing it away without splintering bones, unlike "Tyrannosaurus", which is thought to have been capable of damaging bones. They also suggested that the architecture of the skull could have permitted the use of different strategies against different prey; the skull was light enough to allow attacks on smaller and more agile ornithopods, but strong enough for high-impact ambush attacks against larger prey like stegosaurids and sauropods. Their interpretations were challenged by other researchers, who found no modern analogs to a hatchet attack and considered it more likely that the skull was strong to compensate for its open construction when absorbing the stresses from struggling prey. The original authors noted that "Allosaurus" itself has no modern equivalent, that the tooth row is well-suited to such an attack, and that articulations in the skull cited by their detractors as problematic actually helped protect the palate and lessen stress. Another possibility for handling large prey is that theropods like "Allosaurus" were "flesh grazers" which could take bites of flesh out of living sauropods that were sufficient to sustain the predator so it would not have needed to expend the effort to kill the prey outright. This strategy would also potentially have allowed the prey to recover and be fed upon in a similar way later. An additional suggestion notes that ornithopods were the most common available dinosaurian prey, and that "Allosaurus" may have subdued them by using an attack similar to that of modern big cats: grasping the prey with their forelimbs, and then making multiple bites on the throat to crush the trachea. This is compatible with other evidence that the forelimbs were strong and capable of restraining prey. Studies done by Stephen Lautenschager et al. from the University of Bristol also indicate "Allosaurus" could open its jaws quite wide and sustain considerable muscle force. When compared with "Tyrannosaurus" and the therizinosaurid "Erlikosaurus" in the same study, it was found that "Allosaurus" had a wider gape than either; the animal was capable of opening its jaws to a 92-degree angle at maximum. The findings also indicate that large carnivorous dinosaurs, like modern carnivores, had wider jaw gapes than herbivores.
A biomechanical study published in 2013 by Eric Snively and colleagues found that "Allosaurus" had an unusually low attachment point on the skull for the longissimus capitis superficialis neck muscle compared to other theropods such as "Tyrannosaurus". This would have allowed the animal to make rapid and forceful vertical movements with the skull. The authors found that vertical strikes as proposed by Bakker and Rayfield are consistent with the animal's capabilities. They also found that the animal probably processed carcasses by vertical movements in a similar manner to falcons, such as kestrels: The animal could have gripped prey with the skull and feet, then pulled back and up to remove flesh. This differs from the prey-handling envisioned for tyrannosaurids, which probably tore flesh with lateral shakes of the skull, similar to crocodilians. In addition, "Allosaurus" was able to "move its head and neck around relatively rapidly and with considerable control", at the cost of power.
Other aspects of feeding include the eyes, arms, and legs. The shape of the skull of "Allosaurus" limited potential binocular vision to 20° of width, slightly less than that of modern crocodilians. As with crocodilians, this may have been enough to judge prey distance and time attacks. The arms, compared with those of other theropods, were suited for both grasping prey at a distance or clutching it close, and the articulation of the claws suggests that they could have been used to hook things. Finally, the top speed of "Allosaurus" has been estimated at per hour.
A paper on the cranio-dental morphology of "Allosaurus" and how it worked has deemed the hatchet jaw attack unlikely, reinterpreting the unusually wide gape as an adaptation to allow "Allosaurus" to deliver a muscle-driven bite to large prey, with the weaker jaw muscles being a trade-off to allow for the widened gape.
Sauropod carrion may also have been important to large theropods in the Morrison Formation. Forensic techniques indicate that sauropod carcasses were targeted by "Allosaurus" at all stages of decomposition, indicating that late-stage decay pathogens were not a significant deterrent. A survey of sauropod bones from the Morrison Formation also reported widespread bite marks on sauropod bones in low-economy regions, which suggests that large theropods scavenged large sauropods when available, with the scarcity of such bite marks on the remains of smaller bones being potentially attributable to much more complete consumption of smaller or adolescent sauropods and on ornithischians, which would have been more commonly taken as live prey. A single dead adult "Barosaurus" or "Brachiosaurus" would have had enough calories to sustain multiple large theropods for weeks or months, though the vast majority of the Morrison's sauropod fossil record consisted of much smaller-bodied taxa such as "Camarasaurus lentus" or "Diplodocus".
It has also been argued that disabled individuals such as Big Al and Big Al II were physically incapable of hunting due to their numerous injuries but were able to survive nonetheless as scavengers of giant sauropod-falls, Interestingly, a recent review of paleopathologies in theropods may support this conclusion. The researchers found a positive association between allosaurids and fractures to the appendicular skeleton, while tyrannosaurs had a statistically negative association with these types of injuries. The fact that allosaurs were more likely to survive and heal even when severe fractures limited their locomotion abilities can be explained, in part, by different resource accessibility paradigms for the two groups, as allosauroids generally lived in sauropod-inhabited ecosystems, some of which, including the Morrison, have been interpreted as arid and highly water-stressed environments; however, the water-stressed nature of the Morrison has been heavily criticized in several more recent works on the basis of fossil evidence for the presence of extensive forest cover and aquatic ecosystems.
Social behavior.
It has been speculated since the 1970s that "Allosaurus" preyed on sauropods and other large dinosaurs by hunting in groups.
Such a depiction is common in semitechnical and popular dinosaur literature. Robert T. Bakker has extended social behavior to parental care, and has interpreted shed allosaur teeth and chewed bones of large prey animals as evidence that adult allosaurs brought food to lairs for their young to eat until they were grown, and prevented other carnivores from scavenging on the food. However, there is actually little evidence of gregarious behavior in theropods, and social interactions with members of the same species would have included antagonistic encounters, as shown by injuries to gastralia and bite wounds to skulls (the pathologic lower jaw named "Labrosaurus ferox" is one such possible example). Such head-biting may have been a way to establish dominance in a pack or to settle territorial disputes.
Although "Allosaurus" may have hunted in packs, it has been argued that "Allosaurus" and other theropods had largely aggressive interactions instead of cooperative interactions with other members of their own species. The study in question noted that cooperative hunting of prey much larger than an individual predator, as is commonly inferred for theropod dinosaurs, is rare among vertebrates in general, and modern diapsid carnivores (including lizards, crocodiles, and birds) rarely cooperate to hunt in such a way. Instead, they are typically territorial and will kill and cannibalize intruders of the same species, and will also do the same to smaller individuals that attempt to eat before they do when aggregated at feeding sites. According to this interpretation, the accumulation of remains of multiple "Allosaurus" individuals at the same site; e.g., in the Cleveland–Lloyd Quarry, are not due to pack hunting, but to the fact that "Allosaurus" individuals were drawn together to feed on other disabled or dead allosaurs, and were sometimes killed in the process. This could explain the high proportion of juvenile and subadult allosaurs present, as juveniles and subadults are disproportionally killed at modern group feeding sites of animals like crocodiles and Komodo dragons. The same interpretation applies to Bakker's lair sites. There is some evidence for cannibalism in "Allosaurus", including "Allosaurus" shed teeth found among rib fragments, possible tooth marks on a shoulder blade, and cannibalized allosaur skeletons among the bones at Bakker's lair sites. On the other hand, pathological analysis done by Foth "et al." argued evidence of surviving serious injuries may support gregariousness in "Allosaurus".
Brain and senses.
The brain of "Allosaurus", as interpreted from spiral CT scanning of an endocast, was more consistent with crocodilian brains than those of the other living archosaurs, birds. The structure of the vestibular apparatus indicates that the skull was held nearly horizontal, as opposed to strongly tipped up or down. The structure of the inner ear was like that of a crocodilian, indicating that "Allosaurus" was more adapted to hear lower frequencies and would have had difficulty hearing subtle sounds. The olfactory bulbs were large and well suited for detecting odors, but were typical for an animal of its size.
Paleopathology.
The specimen "Big Al" is well-known for its numerous injuries. Nineteen of its bones were broken or showed signs of serious infection, which may have contributed to "Big Al's" death. Pathologic bones included five ribs, five vertebrae, and four bones of the feet. A particular problem for the living animal was infection and trauma to the right foot that probably affected movement and may have also predisposed the other foot to injury because of a change in gait. "Big Al" had an infection on the first phalanx on the third toe that was afflicted by an involucrum. The infection was long-lived, perhaps up to six months.
"Allosaurus" was one of only two theropods examined in a 2001 study to exhibit a tendon avulsion, and in both cases the avulsion occurred on the forelimb. When the researchers looked for stress fractures, they found that "Allosaurus" had a significantly greater number of stress fractures than "Albertosaurus", "Ornithomimus" or "Archaeornithomimus". Of the 47 hand bones the researchers studied, three were found to contain stress fractures. Of the feet, 281 bones were studied and 17 were found to have stress fractures. The stress fractures in the foot bones "were distributed to the proximal phalanges" and occurred across all three weight-bearing toes in "statistically indistinguishable" numbers. Since the lower end of the third metatarsal would have contacted the ground first while an allosaur was running, it would have borne the most stress. If the allosaurs' stress fractures were caused by damage accumulating while walking or running this bone should have experience more stress fractures than the others. The lack of such a bias in the examined "Allosaurus" fossils indicates an origin for the stress fractures from a source other than running. The authors conclude that these fractures occurred during interaction with prey, like an allosaur trying to hold struggling prey with its feet. The abundance of stress fractures and avulsion injuries in "Allosaurus" provide evidence for "very active" predation-based rather than scavenging diets.
The left scapula and fibula of an "Allosaurus fragilis" specimen cataloged as USNM 4734 are both pathological, both probably due to healed fractures. The specimen USNM 8367 preserved several pathological gastralia which preserve evidence of healed fractures near their middle. Some of the fractures were poorly healed and "formed pseudoarthroses". A specimen with a fractured rib was recovered from the Cleveland-Lloyd Quarry. Another specimen had fractured ribs and fused vertebrae near the end of the tail. An apparent subadult male "Allosaurus fragilis" was reported to have extensive pathologies, with a total of fourteen separate injuries.
Additionally, a subadult "Allosaurus" individual that suffered from spondyloarthropathy has been discovered in Dana Quarry in Wyoming. This finding represents the first known fossil evidence of spondyloarthropathy occurring in a theropod.
Other pathologies reported in "Allosaurus" include:
Paleoecology.
Distribution.
"Allosaurus" is known from the Morrison Formation of the American West and from the Alcobaça, Bombarral, and Lourinhã formations in Portugal. Both the North American and European occurrences date to the Kimmeridgian to Tithonian ages of the Late Jurassic. "Allosaurus" has also been reported from several other countries such as Russia ("A. sibiricus"), Tanzania ("A. tendagurensis"), and Switzerland ("A. meriani"), though these specimens are no longer assigned to the genus.
The Morrison Formation covers an area of 1.2 million km², and "Allosaurus" is found across this range. It occurs in the Salt Wash and Brushy Basin members and their equivalents, being absent only in the oldest part of the formation. Most specimens are not yet assigned to any particular species. According to a 2024 study by Susannah Maidment, "A. fragilis" and "A. jimmadseni" appear to have been contemporaneous but separated geographically, with "A. fragilis" concentrated in the south and east of the Morrison basin and "A. jimmadseni" in the north and west. Borth species occur together only at Dry Mesa quarry. The species "A. anax" is only known from the Kenton 1 Quarry in western Oklahoma from rocks of the Kenton Member, a locally recognised member equivalent to the Brushy Basin Member. "Allosaurus" is the most common theropod in the Morrison Formation, accounting for 70 to 75% of theropod specimens.
Paleoenvironment.
The Morrison Formation is interpreted as a semiarid environment with distinct wet and dry seasons, and flat floodplains. Vegetation varied from river-lining forests of conifers, tree ferns, and ferns (gallery forests), to fern savannas with occasional trees such as the "Araucaria"-like conifer "Brachyphyllum". Animal fossils discovered include bivalves, snails, ray-finned fishes, frogs, salamanders, turtles, sphenodonts, lizards, terrestrial and aquatic crocodylomorphs, several species of pterosaur, numerous dinosaur species, and early mammals such as docodonts, multituberculates, symmetrodonts, and triconodonts. Dinosaurs known from the Morrison include the theropods "Ceratosaurus", "Ornitholestes", "Tanycolagreus", and "Torvosaurus", the sauropods "Haplocanthosaurus", "Camarasaurus", "Cathetosaurus", "Brachiosaurus", "Suuwassea", "Apatosaurus", "Brontosaurus", "Barosaurus", "Diplodocus", "Supersaurus", "Amphicoelias", and "Maraapunisaurus", and the ornithischians "Camptosaurus", "Dryosaurus", and "Stegosaurus". "Allosaurus" is commonly found at the same sites as "Apatosaurus", "Camarasaurus", "Diplodocus", and "Stegosaurus". The Late Jurassic formations of Portugal where "Allosaurus" is present are interpreted as having been similar to the Morrison, but with a stronger marine influence. Many of the dinosaurs of the Morrison Formation are the same genera as those seen in Portuguese rocks (mainly "Allosaurus", "Ceratosaurus", "Torvosaurus", and "Stegosaurus"), or have a close counterpart ("Brachiosaurus" and "Lusotitan", "Camptosaurus" and "Draconyx").
"Allosaurus" was at the top trophic level of the Morrison food chain. It coexisted with fellow large theropods "Ceratosaurus" and "Torvosaurus" in both the United States and Portugal. According to Robert Bakker, the three appear to have had different ecological niches, based on anatomy and the location of fossils. "Ceratosaurus" and "Torvosaurus" may have preferred to be active around waterways, and had lower, thinner bodies that would have given them an advantage in forest and underbrush terrains, whereas "Allosaurus" was more compact, with longer legs, faster but less maneuverable, and seems to have preferred dry floodplains. "Ceratosaurus", better known than "Torvosaurus", differed noticeably from "Allosaurus" in functional anatomy by having a taller, narrower skull with large, broad teeth.
Taphonomy.
Utah's Cleveland-Lloyd quarry is unusual in that about 66% of the vertebrate fossils belong to a single species of carnivore, "A. fragilis", and that the bones are (no longer connected to each other) and well-mixed. More papers have been published on how this site may have formed than on any other fossil tetrapod site. A popular idea is that the site was a predator trap to which the "Allosaurus" were attracted and became mired. In this case, the carcasses could have accumulated over a longer period of time. Other studies postulated a single catastrophe as the cause, such as a severe drought during which an "Allosaurus" population congregated around a water hole and, by their presence, deterred other dinosaurs. The disarticulation of the bones has been explained with trampling by other dinosaurs; movements of the sediment; scavenging; up-welling water; or repeated reworking and re-deposition of the bones. It is also possible that the "Allosaurus" population died elsewhere for unknown reasons and that their bones were washed into the site.
A bone assemblage in the Upper Jurassic Mygatt-Moore Quarry preserves an unusually high occurrence of theropod bite marks, most of which can be attributed to "Allosaurus" and "Ceratosaurus", while others could have been made by "Torvosaurus" given the size of the striations. While the position of the bite marks on the herbivorous dinosaurs is consistent with predation or early access to remains, bite marks found on "Allosaurus" material suggest scavenging, either from the other theropods or from another "Allosaurus". The unusually high concentration of theropod bite marks compared to other assemblages could be explained either by a more complete utilization of resources during a dry season by theropods, or by a collecting bias in other localities.
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AK-47
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The AK-47, officially known as the Avtomat Kalashnikova (; also known as the Kalashnikov or just AK), is an assault rifle that is chambered for the 7.62×39mm cartridge. Developed in the Soviet Union by Russian small-arms designer Mikhail Kalashnikov, it is the originating firearm of the Kalashnikov (or "AK") family of rifles. After more than seven decades since its creation, the AK-47 model and its variants remain one of the most popular and widely used firearms in the world.
Design work on the AK-47 began in 1945. It was presented for official military trials in 1947, and, in 1948, the fixed-stock version was introduced into active service for selected units of the Soviet Army. In early 1949, the AK was officially accepted by the Soviet Armed Forces and used by the majority of the member states of the Warsaw Pact.
The model and its variants owe their global popularity to their reliability under harsh conditions, low production cost (compared to contemporary weapons), availability in virtually every geographic region, and ease of use. The AK has been manufactured in many countries and has seen service with armed forces as well as irregular forces and insurgencies throughout the world. , "of the estimated 500 million firearms worldwide, approximately 100 million belong to the Kalashnikov family, three-quarters of which are AK-47s". The model is the basis for the development of many other types of individual, crew-served, and specialized firearms.
History.
Origins.
During World War II, the Sturmgewehr 44 rifle used by German forces made a deep impression on their Soviet counterparts. The select-fire rifle was chambered for a new intermediate cartridge, the 7.92×33mm Kurz, and combined the firepower of a submachine gun with the range and accuracy of a rifle. On 15 July 1943, an earlier model of the Sturmgewehr was demonstrated before the People's Commissariat of Arms of the USSR. The Soviets were impressed with the weapon and immediately set about developing an intermediate caliber fully automatic rifle of their own, to replace the PPSh-41 submachine guns and outdated Mosin–Nagant bolt-action rifles that armed most of the Soviet Army.
The Soviets soon developed the 7.62×39mm M43 cartridge, used in the semi-automatic SKS carbine and the RPD light machine gun. Shortly after World War II, the Soviets developed the AK-47 rifle, which quickly replaced the SKS in Soviet service. Introduced in 1959, the AKM is a lighter stamped steel version and the most ubiquitous variant of the entire AK series of firearms. In the 1960s, the Soviets introduced the RPK light machine gun, an AK-type weapon with a stronger receiver, a longer heavy barrel, and a bipod, that eventually replaced the RPD light machine gun.
Concept.
Mikhail Kalashnikov began his career as a weapon designer in 1941 while recuperating from a shoulder wound that he received during the Battle of Bryansk. Kalashnikov himself stated..."I was in the hospital, and a soldier in the bed beside me asked: 'Why do our soldiers have only one rifle for two or three of our men when the Germans have automatics?' So I designed one. I was a soldier, and I created a machine gun for a soldier. It was called an Avtomat Kalashnikova, the automatic weapon of Kalashnikov—AK—and it carried the year of its first manufacture, 1947."
The AK-47 is best described as a hybrid of previous rifle technology innovations. "Kalashnikov decided to design an automatic rifle combining the best features of the American M1 Garand and the German StG 44." Kalashnikov's team had access to these weapons and did not need to "reinvent the wheel". Kalashnikov himself observed: "A lot of Russian Army soldiers ask me how one can become a constructor, and how new weaponry is designed. These are very difficult questions. Each designer seems to have his own paths, his own successes and failures. But one thing is clear: before attempting to create something new, it is vital to have a good appreciation of everything that already exists in this field. I myself have had many experiences confirming this to be so."
Some claimed that Kalashnikov copied designs like Bulkin's TKB-415 or Simonov's AVS-31.
Early designs.
Kalashnikov started work on a submachine gun design in 1942 and a light machine gun design in 1943. Early in 1944, Kalashnikov was given some 7.62×39mm M43 cartridges and informed that other designers were working on weapons for this new Soviet small-arms cartridge. It was suggested that a new weapon might well lead to greater things. He then undertook work on the new rifle. In 1944, he entered a design competition with this new 7.62×39mm, semi-automatic, gas-operated, long-stroke piston carbine, strongly influenced by the American M1 Garand. The new rifle was in the same class as the SKS-45 carbine, with a fixed magazine and gas tube above the barrel. However, the new Kalashnikov design lost out to a Simonov design.
In 1946, a new design competition was initiated to develop a new rifle. Kalashnikov submitted a gas-operated rifle with a short-stroke gas piston above the barrel, a breechblock mechanism similar to his 1944 carbine, and a curved 30-round magazine. Kalashnikov's rifles, the AK-1 (with a milled receiver) and AK-2 (with a stamped receiver) proved to be reliable weapons and were accepted to a second round of competition along with other designs.
These prototypes (also known as the AK-46) had a rotary bolt, a two-part receiver with separate trigger unit housing, dual controls (separate safety and fire selector switches), and a non-reciprocating charging handle located on the left side of the weapon. This design had many similarities to the StG 44. In late 1946, as the rifles were being tested, one of Kalashnikov's assistants, Aleksandr Zaitsev, suggested a major redesign to improve reliability. At first, Kalashnikov was reluctant, given that their rifle had already fared better than its competitors. Eventually, however, Zaitsev managed to persuade Kalashnikov.
In November 1947, the new prototypes (AK-47s) were completed. The rifle used a long-stroke gas piston above the barrel. The upper and lower receivers were combined into a single receiver. The selector and safety were combined into a single control lever/dust cover on the right side of the rifle and the bolt handle was attached to the bolt carrier. This simplified the design and production of the rifle. The first army trial series began in early 1948. The new rifle proved to be reliable under a wide range of conditions and possessed convenient handling characteristics. In 1949, it was adopted by the Soviet Army as the "7.62 mm Kalashnikov rifle (AK)".
Further development.
There were many difficulties during the initial phase of production. The first production models had stamped sheet metal receivers with a milled trunnion and butt stock insert and a stamped body. Difficulties were encountered in welding the guide and ejector rails, causing high rejection rates. Instead of halting production, a heavy machined receiver was substituted for the sheet metal receiver. Even though production of these milled rifles started in 1951, they were officially referred to as AK-49, based on the date their development started, but they are widely known in the collectors' and current commercial market as "Type 2 AK-47". This was a more costly process, but the use of machined receivers accelerated production as tooling and labor for the earlier Mosin–Nagant rifle's machined receiver were easily adapted. Partly because of these problems, the Soviets were not able to distribute large numbers of the new rifles to soldiers until 1956. During this time, production of the interim SKS rifle continued.
Once the manufacturing difficulties of non-milled receivers had been overcome, a redesigned version designated the AKM (M for "modernized" or "upgraded"; in Russian: []) was introduced in 1959. This new model used a stamped sheet metal receiver and featured a slanted muzzle brake on the end of the barrel to compensate for muzzle rise under recoil. In addition, a hammer retarder was added to prevent the weapon from firing out of battery (without the bolt being fully closed), during rapid or fully automatic fire. This is also sometimes referred to as a "cyclic rate reducer", or simply "rate reducer", as it also has the effect of reducing the number of rounds fired per minute during fully automatic fire. The rifle was also roughly one-third lighter than the previous model.
Most licensed and unlicensed productions of the Kalashnikov assault rifle abroad were of the AKM variant, partially due to the much easier production of the stamped receiver. This model is the most commonly encountered, having been produced in much greater quantities. All rifles based on the Kalashnikov design are often colloquially referred to as "AK-47s" in the West and some parts of Asia, although this is only correct when applied to rifles based on the original three receiver types. In most former Eastern Bloc countries, the weapon is known simply as the "Kalashnikov" or "AK". The differences between the milled and stamped receivers includes the use of rivets rather than welds on the stamped receiver, as well as the placement of a small dimple above the magazine well for stabilization of the magazine.
Replacement.
In 1974, the Soviets began replacing their AK-47 and AKM rifles with a newer design, the AK-74, which uses 5.45×39mm ammunition. This new rifle and cartridge had only started to be manufactured in Eastern European nations when the Soviet Union collapsed, drastically slowing the production of the AK-74 and other weapons of the former Soviet bloc.
Design.
The AK-47 was designed to be a simple, reliable fully automatic rifle that could be manufactured quickly and cheaply, using mass production methods that were state of the art in the Soviet Union during the late 1940s. The AK-47 uses a long-stroke gas system generally associated with high reliability in adverse conditions. The large gas piston, generous clearance between moving parts, and tapered cartridge case design allow the gun to endure large amounts of foreign matter and fouling without failing to cycle.
Cartridge.
The AK fires the 7.62×39mm cartridge with a muzzle velocity of .
The cartridge weight is , and the projectile weight is . The original Soviet M43 bullets are 123-grain boat-tail bullets with a copper-plated steel jacket, a large steel core, and some lead between the core and the jacket. The AK has excellent penetration when shooting through heavy foliage, walls, or a common vehicle's metal body and into an opponent attempting to use these things as cover. The 7.62×39mm M43 projectile does not generally fragment when striking an opponent and has an unusual tendency to remain intact even after making contact with bone. The 7.62×39mm round produces significant wounding in cases where the bullet tumbles (yaws) in tissue, but produces relatively minor wounds in cases where the bullet exits before beginning to yaw. In the absence of yaw, the M43 round can pencil through tissue with relatively little injury.
Most, if not all, of the 7.62×39mm ammunition found today is of the upgraded M67 variety. This variety deleted the steel insert, shifting the center of gravity rearward, and allowing the projectile to destabilize (or yaw) at about , nearly earlier in tissue than the M43 round. This change also reduces penetration in ballistic gelatin to ~ for the newer M67 round versus ~ for the older M43 round. However, the wounding potential of M67 is mostly limited to the small permanent wound channel the bullet itself makes, especially when the bullet yaws.
Operating mechanism.
To fire, the operator inserts a loaded magazine, pulls back and releases the charging handle, and then pulls the trigger. In semi-automatic, the firearm fires only once, requiring the trigger to be released and depressed again for the next shot. In fully automatic, the rifle continues to fire automatically cycling fresh rounds into the chamber until the magazine is exhausted or pressure is released from the trigger. After ignition of the cartridge primer and propellant, rapidly expanding propellant gases are diverted into the gas cylinder above the barrel through a vent near the muzzle. The build-up of gases inside the gas cylinder drives the long-stroke piston and bolt carrier rearward and a cam guide machined into the underside of the bolt carrier, along with an ejector spur on the bolt carrier rail guide, rotates the bolt approximately 35° and unlocks it from the barrel extension via a camming pin on the bolt. The moving assembly has about of free travel, which creates a delay between the initial recoil impulse of the piston and the bolt unlocking sequence, allowing gas pressures to drop to a safe level before the seal between the chamber and the bolt is broken. The AK-47 does not have a gas valve; excess gases are ventilated through a series of radial ports in the gas cylinder. Unlike many other rifle platforms, such as the AR-15 platform, the Kalashnikov platform bolt locking lugs are chamfered allowing for primary extraction upon bolt rotation which aids reliable feeding and extraction, albeit not with that much force due to the short distance the bolt carrier travels before acting on the locking lug. The Kalashnikov platform then uses an extractor claw along with a fin shaped ejector to eject the spent cartridge case.
Barrel.
The rifle received a barrel with a chrome-lined bore and four right-hand grooves at a 240 mm (1 in 9.45 in) or 31.5 calibers rifling twist rate. The gas block contains a gas channel that is installed at a slanted angle with the bore axis. The muzzle is threaded for the installation of various muzzle devices such as a muzzle brake or a blank-firing adaptor.
Gas block.
The gas block of the AK-47 features a cleaning rod capture or sling loop. Gas relief ports that alleviate gas pressure are placed horizontally in a row on the gas cylinder.
Fire selector.
The fire selector is a large lever located on the right side of the rifle; it acts as a dust cover and prevents the charging handle from being pulled fully to the rear when it is on safe. It is operated by the shooter's right fore-fingers and has three settings: safe (up), full-auto (center), and semi-auto (down). The reason for this is that a soldier under stress will push the selector lever down with considerable force, bypassing the full-auto stage and setting the rifle to semi-auto. To set the AK-47 to full-auto requires the deliberate action of centering the selector lever. To operate the fire selector lever, right-handed shooters have to briefly remove their right hand from the pistol grip, which is ergonomically sub-optimal. Some AK-type rifles also have a more traditional selector lever on the left side of the receiver, just above the pistol grip. This lever is operated by the shooter's right thumb and has three settings: safe (forward), full-auto (center), and semi-auto (backward).
Sights.
The AK-47 uses a notched rear tangent iron sight calibrated in increments from . The front sight is a post adjustable for elevation in the field. Horizontal adjustment requires a special drift tool and is done by the armory before the issue or if the need arises by an armorer after the issue. The sight line elements are approximately over the bore axis. The "point-blank range" battle zero setting "П" standing for "постоянная" (constant) on the 7.62×39mm AK-47 rear tangent sight element corresponds to a zero. These settings mirror the Mosin–Nagant and SKS rifles, which the AK-47 replaced. For the AK-47 combined with service cartridges, the 300 m battle zero setting limits the apparent "bullet rise" within approximately relative to the line of sight. Soldiers are instructed to fire at any target within this range by simply placing the sights on the center of mass (the belt buckle, according to Russian and former Soviet doctrine) of the enemy target. Any errors in range estimation are tactically irrelevant, as a well-aimed shot will hit the torso of the enemy soldier. Some AK-type rifles have a front sight with a flip-up luminous dot that is calibrated at , for improved night fighting.
Furniture.
The AK-47 was originally equipped with a buttstock, handguard, and an upper heat guard made from solid wood. With the introduction of the Type 3 receiver the buttstock, lower handguard, and upper heat guard were manufactured from birch plywood laminates. Such engineered woods are stronger and resist warping better than the conventional one-piece patterns, do not require lengthy maturing, and are cheaper. The wooden furniture was finished with the Russian amber shellac finishing process. AKS and AKMS models featured a downward-folding metal butt-stock similar to that of the German MP40 submachine-gun, for use in the restricted space in the BMP infantry combat vehicle, as well as by paratroops. All 100 series AKs use plastic furniture with side-folding stocks.
Magazines.
The standard magazine capacity is 30 rounds. There are also 10-, 20-, and 40-round box magazines, as well as 75-round drum magazines.
The AK-47's standard 30-round magazines have a pronounced curve that allows them to smoothly feed ammunition into the chamber. Their heavy steel construction combined with "feed-lips" (the surfaces at the top of the magazine that control the angle at which the cartridge enters the chamber) machined from a single steel billet makes them highly resistant to damage. These magazines are so strong that "Soldiers have been known to use their mags as hammers, and even bottle openers". This contributes to the AK-47 magazine being more reliable but makes it heavier than US and NATO magazines.
The early slab-sided steel AK-47 30-round detachable box magazines had sheet-metal bodies and weighed empty. The later steel AKM 30-round magazines had lighter sheet-metal bodies with prominent reinforcing ribs weighing empty. To further reduce weight, a lightweight magazine with an aluminum body with a prominent reinforcing waffle rib pattern weighing empty was developed for the AKM that proved to be too fragile, and the small issued amount of these magazines were quickly withdrawn from service. As a replacement steel-reinforced 30-round plastic 7.62×39mm box magazines were introduced. These rust-colored magazines weigh empty and are often mistakenly identified as being made of Bakelite (a phenolic resin), but were fabricated from two parts of AG-S4 molding compound (a glass-reinforced phenol-formaldehyde binder impregnated composite), assembled using an epoxy resin adhesive. Noted for their durability, these magazines did however compromise the rifle's camouflage and lacked the small horizontal reinforcing ribs running down both sides of the magazine body near the front that were added on all later plastic magazine generations. A second-generation steel-reinforced dark-brown (color shades vary from maroon to plum to near black) 30-round 7.62×39mm magazine was introduced in the early 1980s, fabricated from ABS plastic. The third generation steel-reinforced 30-round 7.62×39mm magazine is similar to the second generation, but is darker colored and has a matte non-reflective surface finish. The current issue is a steel-reinforced matte true black non- reflective surface finished 7.62×39mm 30-round magazine, fabricated from ABS plastic weighing empty.
Early steel AK-47 magazines are long; the later ribbed steel AKM and newer plastic 7.62×39mm magazines are about shorter.
The transition from steel to mainly plastic magazines yields a significant weight reduction and allows a soldier to carry more ammunition for the same weight.
All 7.62×39mm AK magazines are backward compatible with older AK variants.
10.12 kg (22.3 lb) is the maximum amount of ammo that the average soldier can comfortably carry. It also allows for the best comparison of the three most common 7.62×39mm AK magazines.
Most Yugoslavian and some East German AK magazines were made with cartridge followers that hold the bolt open when empty; however, most AK magazine followers allow the bolt to close when the magazine is empty.
Accessories.
Accessories supplied with the rifle include a long 6H3 bayonet featuring a long spear point blade. The AK-47 bayonet is installed by slipping the diameter muzzle ring around the muzzle and latching the handle down on the bayonet lug under the front sight base.
All current model AKM rifles can mount under-barrel 40 mm grenade launchers such as the GP-25 and its variants, which can fire up to 20 rounds per minute and have an effective range of up to 400 meters. The main grenade is the VOG-25 (VOG-25M) fragmentation grenade which has a 6 m (9 m) (20 ft (30 ft)) lethality radius. The VOG-25P/VOG-25PM ("jumping") variant explodes above the ground.
The AK-47 can also mount a (rarely used) cup-type grenade launcher, the Kalashnikov grenade launcher that fires standard RGD-5 Soviet hand grenades. The maximum effective range is approximately 150 meters. This launcher can also be used to launch tear gas and riot control grenades.
All current AKs (100 series) and some older models have side rails for mounting a variety of scopes and sighting devices, such as the PSO-1 Optical Sniper Sight. The side rails allow for the removal and remounting of optical accessories without interfering with the zeroing of the optic. However, the 100 series side folding stocks cannot be folded with the optics mounted.
Characteristics.
Service life.
The AK-47 and its variants have been and are made in dozens of countries, with "quality ranging from finely engineered weapons to pieces of questionable workmanship." As a result, the AK-47 has a service/system life of approximately 6,000, to 10,000, to 15,000 rounds. The AK-47 was designed to be a cheap, simple, easy-to-manufacture rifle, perfectly matching Soviet military doctrine that treats equipment and weapons as disposable items. As units are often deployed without adequate logistical support and dependent on "battlefield cannibalization" for resupply, it is more cost-effective to replace rather than repair weapons.
The AK-47 has small parts and springs that need to be replaced every few thousand rounds. However, "Every time it is disassembled beyond the field stripping stage, it will take some time for some parts to regain their fit, and some parts may tend to shake loose and fall out when firing the weapon. Some parts of the AK-47 line are riveted together. Repairing these can be quite a hassle since the end of the rivet has to be ground off and a new one set after the part is replaced."
Variants.
For the further developed AK models, see Kalashnikov rifles.
Production.
Manufacturing countries of AK-47 and its variants in alphabetical order.
A private company Kalashnikov Concern (formerly Izhmash) from Russia has repeatedly claimed that the majority of foreign manufacturers are producing AK-type rifles without proper licensing.
Accuracy potential.
US military method.
The AK-47's accuracy is generally sufficient to hit an adult male torso out to about , though even experts firing from prone or bench rest positions at this range were observed to have difficulty placing ten consecutive rounds on target. Later designs did not significantly improve the rifle's accuracy. An AK can fire a 10-shot group of at , and at The newer stamped-steel receiver AKM models, while more rugged and less prone to metal fatigue, are less accurate than the forged/milled receivers of their predecessors: the milled AK-47s are capable of shooting groups at , whereas the stamped AKMs are capable of shooting groups at .
The best shooters can hit a man-sized target at within five shots (firing from a prone or bench rest position) or ten shots (standing).
The single-shot hit-probability on the NATO E-type Silhouette Target (a human upper body half and head silhouette) of the AK-47 and the later developed AK-74, M16A1, and M16A2 rifles were measured by the US military under ideal proving ground conditions in the 1980s as follows:
Under worst field exercise circumstances, the hit probabilities for all the tested rifles were drastically reduced, from 34% at 50m down to 3–4% at 600m with no significant differences between weapons at each range.
Russian method.
The following table represents the Russian circular error probable method for determining accuracy, which involves drawing two circles on the target, one for the maximum vertical dispersion of hits and one for the maximum horizontal dispersion of hits. They then disregard the hits on the outer part of the target and only count half of the hits (50% or R50) on the inner part of the circles. This significantly reduces the overall diameter of the groups. They then use both the vertical and horizontal measurements of the reduced groups to measure accuracy. When the R50 results are doubled, the hit probability increases to 93.7%.
The vertical and horizontal mean (R50) deviations with service ammunition at for AK platforms are.
Users.
Illicit trade.
Throughout the world, the AK and its variants are commonly used by governments, revolutionaries, terrorists, criminals, and civilians alike. In some countries, such as Somalia, Rwanda, Mozambique, Congo, and Tanzania, the prices for Black Market AKs are between $30 and $125 per weapon and prices have fallen in the last few decades due to mass counterfeiting. In Kenya, "an AK-47 fetches five head of cattle (about 10,000 Kenya shillings or 100 US dollars) when offered for barter, but costs almost half that price when cash is paid". There are places around the world where AK-type weapons can be purchased on the black market "for as little as $6, or traded for a chicken or a sack of grain".
The AK-47 has also spawned a cottage industry of sorts and has been copied and manufactured (one gun at a time) in small shops around the world (see Khyber Pass Copy). The estimated numbers of AK-type weapons vary greatly. The Small Arms Survey suggests that "between 70 and 100 million of these weapons have been produced since 1947". The World Bank estimates that out of the 500 million total firearms available worldwide, 100 million are of the Kalashnikov family, and 75 million are AK-47s. Because AK-type weapons have been made in many countries, often illicitly, it is impossible to know how many exist.
Conflicts.
The AK-47 has been used in the following conflicts:
Cultural influence and impact.
During the Cold War, the Soviet Union and the People's Republic of China, as well as United States and other NATO nations supplied arms and technical knowledge to numerous countries and rebel forces around the world. During this time the Western countries used relatively expensive automatic rifles, such as the FN FAL, the HK G3, the M14, and the M16. In contrast, the Russians and Chinese used the AK-47; its low production cost and ease of manufacture allow them to make AKs in vast numbers.
In the pro-communist states, the AK-47 became a symbol of the Third World revolution. They were utilized in the Cambodian Civil War and the Cambodian–Vietnamese War. During the 1980s, the Soviet Union became the principal arms dealer to countries embargoed by Western nations, including Middle Eastern nations such as Libya and Syria, which welcomed Soviet Union backing against Israel. After the fall of the Soviet Union, AK-47s were sold both openly and on the black market to any group with cash, including drug cartels and dictatorial states, and more recently they have been seen in the hands of Islamist groups such as Al-Qaeda, ISIL, and the Taliban in Afghanistan and Iraq, and leftist groups such as FARC and Ejército de Liberación Nacional guerrillas in Colombia.
In Russia, the Kalashnikov is a tremendous source of national pride. "The family of the inventor of the world's most famous rifle, Mikhail Kalashnikov, has authorized German engineering company MMI to use the well-known Kalashnikov name on a variety of not-so-deadly goods." In recent years, Kalashnikov Vodka has been marketed with souvenir bottles in the shape of the AK-47 Kalashnikov. There are also Kalashnikov watches, umbrellas, and knives.
The Kalashnikov Museum (also called the AK-47 museum) opened on 4 November 2004 in Izhevsk, Udmurt Republic. This city is in the Ural Region of Russia. The museum chronicles the biography of General Kalashnikov and documents the invention of the AK-47. The museum complex of Kalashnikov's small arms, a series of halls, and multimedia exhibitions are devoted to the evolution of the AK-47 rifle and attracts 10,000 monthly visitors. Nadezhda Vechtomova, the museum director, stated in an interview that the purpose of the museum is to honor the ingenuity of the inventor and the hard work of the employees and to "separate the weapon as a weapon of murder from the people who are producing it and to tell its history in our country".
On 19 September 2017 a monument of Kalashnikov was unveiled in central Moscow. A protester, later detained by police, attempted to unfurl a banner reading "a creator of weapons is a creator of death".
The proliferation of this weapon is reflected by more than just numbers. The AK-47 is included on the flag of Mozambique and its emblem, an acknowledgment that the country gained its independence in large part through the effective use of their AK-47s. It is also found in the coats of arms of East Timor, Zimbabwe and the revolution era Burkina Faso, as well as in the flags of Hezbollah, Syrian Resistance, FARC-EP, the New People's Army, TKP/TIKKO and the International Revolutionary People's Guerrilla Forces.
US and Western Europe countries frequently associate the AK-47 with their enemies, both Cold War era and present-day. For example, Western works of fiction (movies, television, novels, video games) often portray criminals, gang members, insurgents, and terrorists using AK-47s as the weapon of choice. Conversely, throughout the developing world, the AK-47 can be positively attributed with revolutionaries against foreign occupation, imperialism, or colonialism.
In Ireland the AK-47 is associated with The Troubles due to its extensive use by republican paramilitaries during this period. In 2013, a decommissioned AK-47 was included in the "A History of Ireland in 100 Objects" collection.
The AK-47 made an appearance in US popular culture as a recurring focus in the Nicolas Cage film "Lord of War" (2005). Numerous monologues in the movie focus on the weapon, and its effects on global conflict and the gun running market.
In Iraq and Afghanistan, private military company contractors from the UK and other countries used the AK-47 and its variants along with Western firearms such as the AR-15.
In 2006, the Colombian musician and peace activist César López devised the "escopetarra", an AK converted into a guitar. One sold for US$17,000 in a fundraiser held to benefit the victims of anti-personnel mines, while another was exhibited at the United Nations' Conference on Disarmament.
In Mexico, the AK-47 is known as "Cuerno de Chivo" (literally "Goat's Horn") because of its curved magazine design. It is one of the weapons of choice of Mexican drug cartels. It is sometimes mentioned in Mexican folk music lyrics.
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1349
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7903804
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https://en.wikipedia.org/wiki?curid=1349
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Atanasoff–Berry computer
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The Atanasoff–Berry computer (ABC) was the first automatic electronic digital computer. The device was limited by the technology of the day. The ABC's priority is debated among historians of computer technology, because it was neither programmable, nor Turing-complete. Conventionally, the ABC would be considered the first electronic ALU (arithmetic logic unit) which is integrated into every modern processor's design.
Its unique contribution was to make computing faster by being the first to use vacuum tubes to do arithmetic calculations. Prior to this, slower electro-mechanical methods were used by Konrad Zuse's Z1 computer, and the simultaneously developed Harvard Mark I. The first electronic, programmable, digital machine, the Colossus computer from 1943 to 1945, used similar tube-based technology as ABC.
Overview.
Conceived in 1937, the machine was built by Iowa State College mathematics and physics professor John Vincent Atanasoff with the help of graduate student Clifford Berry. It was designed only to solve systems of linear equations and was successfully tested in 1942. However, its intermediate result storage mechanism, a paper card writer/reader, was not perfected, and when John Vincent Atanasoff left Iowa State College for World War II assignments, work on the machine was discontinued. The ABC pioneered important elements of modern computing, including binary arithmetic and electronic switching elements, but its special-purpose nature and lack of a changeable, stored program distinguish it from modern computers. The computer was designated an IEEE Milestone in 1990.
Atanasoff and Berry's computer work was not widely known until it was rediscovered in the 1960s, amid patent disputes over the first instance of an electronic computer. At that time ENIAC, that had been created by John Mauchly and J. Presper Eckert, was considered to be the first computer in the modern sense, but in 1973 a U.S. District Court invalidated the ENIAC patent and concluded that the ENIAC inventors had derived the subject matter of the electronic digital computer from Atanasoff. When, in the mid-1970s, the secrecy surrounding the British World War II development of the Colossus computers that pre-dated ENIAC, was lifted and Colossus was described at a conference in Los Alamos, New Mexico, in June 1976, John Mauchly and Konrad Zuse were reported to have been astonished.
Design and construction.
According to Atanasoff's account, several key principles of the Atanasoff–Berry computer were conceived in a sudden insight after a long nighttime drive to Rock Island, Illinois, during the winter of 1937–38. The ABC innovations included electronic computation, binary arithmetic, parallel processing, regenerative capacitor memory, and a separation of memory and computing functions. The mechanical and logic design was worked out by Atanasoff over the next year. A grant application to build a proof of concept prototype was submitted in March 1939 to the Agronomy department, which was also interested in speeding up computation for economic and research analysis. $5,000 of further funding () to complete the machine came from the nonprofit Research Corporation of New York City.
The ABC was built by Atanasoff and Berry in the basement of the physics building at Iowa State College from 1939 to 1942. The initial funds were released in September, and the 11-tube prototype was first demonstrated in October 1939. A December demonstration prompted a grant for construction of the full-scale machine. The ABC was built and tested over the next two years. A January 15, 1941, story in the "Des Moines Register" announced the ABC as "an electrical computing machine" with more than 300 vacuum tubes that would "compute complicated algebraic equations" (but gave no precise technical description of the computer). The system weighed more than . It contained approximately of wire, 280 dual-triode vacuum tubes, 31 thyratrons, and was about the size of a desk.
It was not programmable, which distinguishes it from more general machines of the same era, such as Konrad Zuse's 1941 Z3 (or earlier iterations) and the Colossus computers of 1943–1945. Nor did it implement the stored-program architecture, first implemented in the Manchester Baby of 1948, required for fully general-purpose practical computing machines.
The machine was, however, the first to implement:
The memory of the Atanasoff–Berry computer was a system called "regenerative capacitor memory", which consisted of a pair of drums, each containing 1600 capacitors that rotated on a common shaft once per second. The capacitors on each drum were organized into 32 "bands" of 50 (30 active bands and two spares in case a capacitor failed), giving the machine a speed of 30 additions/subtractions per second. Data was represented as 50-bit binary fixed-point numbers. The electronics of the memory and arithmetic units could store and operate on 60 such numbers at a time (3000 bits).
The alternating current power-line frequency of 60 Hz was the primary clock rate for the lowest-level operations.
The arithmetic logic functions were fully electronic, implemented with vacuum tubes. The family of logic gates ranged from inverters to two- and three-input gates. The input and output levels and operating voltages were compatible between the different gates. Each gate consisted of one inverting vacuum-tube amplifier, preceded by a resistor divider input network that defined the logical function. The control logic functions, which only needed to operate once per drum rotation and therefore did not require electronic speed, were electromechanical, implemented with relays.
The ALU operated on only one bit of each number at a time; it kept the carry/borrow bit in a capacitor for use in the next AC cycle.
Although the Atanasoff–Berry computer was an important step up from earlier calculating machines, it was not able to run entirely automatically through an entire problem. An operator was needed to operate the control switches to set up its functions, much like the electro-mechanical calculators and unit record equipment of the time. Selection of the operation to be performed, reading, writing, converting to or from binary to decimal, or reducing a set of equations was made by front-panel switches and, in some cases, jumpers.
There were two forms of input and output: primary user input and output and an intermediate results output and input. The intermediate results storage allowed operation on problems too large to be handled entirely within the electronic memory. (The largest problem that could be solved without the use of the intermediate output and input was two simultaneous equations, a trivial problem.)
Intermediate results were binary, written onto paper sheets by electrostatically modifying the resistance at 1500 locations to represent 30 of the 50-bit numbers (one equation). Each sheet could be written or read in one second. The reliability of the system was limited to about 1 error in 100,000 calculations by these units, primarily attributed to lack of control of the sheets' material characteristics. In retrospect, a solution could have been to add a parity bit to each number as written. This problem was not solved by the time Atanasoff left the university for war-related work.
Primary user input was decimal, via standard IBM 80-column punched cards, and output was decimal, via a front-panel display.
Function.
The ABC was designed for a specific purpose the solution of systems of simultaneous linear equations. It could handle systems with up to 29 equations, a difficult problem for the time. Problems of this scale were becoming common in physics, the department in which John Atanasoff worked. The machine could be fed two linear equations with up to 29 variables and a constant term and eliminate one of the variables. This process would be repeated manually for each of the equations, which would result in a system of equations with one fewer variable. Then the whole process would be repeated to eliminate another variable.
George W. Snedecor, the head of Iowa State's Statistics Department, was very likely the first user of an electronic digital computer to solve real-world mathematics problems. He submitted many of these problems to Atanasoff.
Patent dispute.
On June 26, 1947, J. Presper Eckert and John Mauchly were the first to file for patent on a digital computing device (ENIAC), much to the surprise of Atanasoff. The ABC had been examined by John Mauchly in June 1941, and Isaac Auerbach, a former student of Mauchly's, alleged that it influenced his later work on ENIAC, although Mauchly denied this. The ENIAC patent did not issue until 1964, and by 1967 Honeywell sued Sperry Rand in an attempt to break the ENIAC patents, arguing that the ABC constituted prior art. The United States District Court for the District of Minnesota released its judgement on October 19, 1973, finding in "Honeywell v. Sperry Rand" that the ENIAC patent was a derivative of John Atanasoff's invention.
Campbell-Kelly and Aspray conclude:
The case was legally resolved on October 19, 1973, when U.S. District Judge Earl R. Larson held the ENIAC patent invalid, ruling that the ENIAC derived many basic ideas from the Atanasoff–Berry computer. Judge Larson explicitly stated:
Herman Goldstine, one of the original developers of ENIAC wrote:
Replica.
The original ABC was eventually dismantled in 1948, when the university converted the basement to classrooms, and all of its pieces except for one memory drum were discarded.
In 1997, a team of researchers led by Delwyn Bluhm and John Gustafson from Ames Laboratory (located on the Iowa State University campus) finished building a working replica of the Atanasoff–Berry computer at a cost of $350,000 (equivalent to $ in ). The replica ABC was on display in the first floor lobby of the Durham Center for Computation and Communication at Iowa State University and was subsequently exhibited at the Computer History Museum.
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1354
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1301264607
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https://en.wikipedia.org/wiki?curid=1354
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Andes
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The Andes ( ), Andes Mountains or Andean Mountain Range (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long and wide (widest between 18°S and 20°S latitude) and has an average height of about . The Andes extend from south to north through seven South American countries: Argentina, Chile, Bolivia, Peru, Ecuador, Colombia, and Venezuela.
Along their length, the Andes are split into several ranges, separated by intermediate depressions. The Andes are the location of several high plateaus—some of which host major cities such as Arequipa, Bogotá, Cali, Medellín, El Alto, La Paz, Mérida, Santiago and Sucre. The Altiplano Plateau is the world's second highest after the Tibetan Plateau. These ranges are in turn grouped into three major divisions based on climate: the Tropical Andes, the Dry Andes, and the Wet Andes.
The Andes are the highest mountain range outside of Asia. The range's highest peak, Argentina's Aconcagua, rises to an elevation of about above sea level. The peak of Chimborazo in the Ecuadorian Andes is farther from the Earth's center than any other location on the Earth's surface, due to the equatorial bulge resulting from the Earth's rotation. The world's highest volcanoes are in the Andes, including Ojos del Salado on the Chile–Argentina border, which rises to .
The Andes are also part of the American Cordillera, a chain of mountain ranges (cordillera) that consists of an almost continuous sequence of mountain ranges that form the western "backbone" of the Americas and Antarctica.
Etymology.
The etymology of the word "Andes" has been debated. The majority consensus is that it derives from the Quechua word "east" as in "Antisuyu" (Quechua for "east region"), one of the four regions of the Inca Empire.
The term "cordillera" comes from the Spanish word "cordel" "rope" and is used as a descriptive name for several contiguous sections of the Andes, as well as the entire Andean range, and the combined mountain chain along the western part of the North and South American continents.
Geography.
The Andes can be divided into three sections:
At the northern end of the Andes, the separate Sierra Nevada de Santa Marta range is often, but not always, treated as part of the Northern Andes.
The Leeward Antilles islands Aruba, Bonaire, and Curaçao, which lie in the Caribbean Sea off the coast of Venezuela, were formerly thought to represent the submerged peaks of the extreme northern edge of the Andes range, but ongoing geological studies indicate that such a simplification does not do justice to the complex tectonic boundary between the South American and Caribbean plates.
Geology.
The Andes are an orogenic belt of mountains along the Pacific Ring of Fire, a zone of volcanic activity that encompasses the Pacific rim of the Americas as well as the Asia-Pacific region. The Andes are the result of tectonic plate processes extending during the Mesozoic and Tertiary eras, caused by the subduction of oceanic crust beneath the South American Plate as the Nazca Plate and South American Plate converge. These processes were accelerated by the effects of climate. As the uplift of the Andes created a rain shadow on the western fringes of Chile, ocean currents and prevailing winds carried moisture away from the Chilean coast. This caused some areas of the subduction zone to be sediment-starved, which in turn prevented the subducting plate from having a well lubricated surface. These factors increased the rate of contractional coastal uplift in the Andes. The main cause of the rise of the Andes is the contraction of the western rim of the South American Plate due to the subduction of the Nazca Plate and the Antarctic Plate. To the east, the Andes range is bounded by several sedimentary basins, such as the Orinoco Basin, the Amazon Basin, the Madre de Dios Basin, and the Gran Chaco, that separate the Andes from the ancient cratons in eastern South America. In the south, the Andes share a long boundary with the former Patagonia Terrane. To the west, the Andes end at the Pacific Ocean, although the Peru–Chile Trench can be considered their ultimate western limit. From a geographical approach, the Andes are considered to have their western boundaries marked by the appearance of coastal lowlands and less-rugged topography. The Andes also contain large quantities of iron ore located in many mountains within the range.
The Andean orogen has a series of bends or oroclines. The Bolivian Orocline is a seaward-concave bending in the coast of South America and the Andes Mountains at about 18° S. At this point, the orientation of the Andes turns from northwest in Peru to south in Chile and Argentina. The Andean segments north and south of the Orocline have been rotated 15° counter-clockwise to 20° clockwise respectively. The Bolivian Orocline area overlaps with the area of the maximum width of the Altiplano Plateau, and according to Isacks (1988) the Orocline is related to crustal shortening. The specific point at 18° S where the coastline bends is known as the Arica Elbow. Further south lies the Maipo Orocline, a more subtle orocline between 30° S and 38°S with a seaward-concave break in the trend at 33° S. Near the southern tip of the Andes lies the Patagonian Orocline.
Orogeny.
The western rim of the South American Plate has been the place of several pre-Andean orogenies since at least the late Proterozoic and early Paleozoic, when several terranes and microcontinents collided and amalgamated with the ancient cratons of eastern South America, by then the South American part of Gondwana.
The formation of the modern Andes began with the events of the Triassic, when Pangaea began the breakup that resulted in developing several rifts. The development continued through the Jurassic Period. It was during the Cretaceous Period that the Andes began to take their present form, by the uplifting, faulting, and folding of sedimentary and metamorphic rocks of the ancient cratons to the east. The rise of the Andes has not been constant, as different regions have had different degrees of tectonic stress, uplift, and erosion.
Across the Drake Passage lie the mountains of the Antarctic Peninsula south of the Scotia Plate, which appear to be a continuation of the Andes chain.
The far east regions of the Andes experience a series of changes resulting from the Andean orogeny. Parts of the Sunsás Orogen in Amazonian craton disappeared from the surface of the earth, being overridden by the Andes. The Sierras de Córdoba, where the effects of the ancient Pampean orogeny can be observed, owe their modern uplift and relief to the Andean orogeny in the Tertiary. Further south in southern Patagonia, the onset of the Andean orogeny caused the Magallanes Basin to evolve from being an extensional back-arc basin in the Mesozoic to being a contractional foreland basin in the Cenozoic.
Seismic activity.
Tectonic forces above the subduction zone along the entire west coast of South America where the Nazca Plate and a part of the Antarctic Plate are sliding beneath the South American Plate continue to produce an ongoing orogenic event resulting in minor to major earthquakes and volcanic eruptions to this day. Many high-magnitude earthquakes have been recorded in the region, such as the 2010 Maule earthquake (M8.8), the 2015 Illapel earthquake (M8.2), and the 1960 Valdivia earthquake (M9.5), which as of 2024 was the strongest ever recorded on seismometers.
The amount, magnitude, and type of seismic activity varies greatly along the subduction zone. These differences are due to a wide range of factors, including friction between the plates, angle of subduction, buoyancy of the subducting plate, rate of subduction, and hydration value of the mantle material. The highest rate of seismic activity is observed in the central portion of the boundary, between 33°S and 35°S. In this area, the angle of subduction is very low, meaning the subducting plate is nearly horizontal. Studies of mantle hydration across the subduction zone have shown a correlation between increased material hydration and lower-magnitude, more frequent seismic activity. Zones exhibiting dehydration instead are thought to have a higher potential for larger, high-magnitude earthquakes in the future.
The mountain range is also a source of shallow intraplate earthquakes within the South American Plate. The largest such earthquake (as of 2024) struck Peru in 1947 and measured 7.5. In the Peruvian Andes, these earthquakes display normal (1946), strike-slip (1976), and reverse (1969, 1983) mechanisms. The Amazonian Craton is actively underthrusted beneath the sub-Andes region of Peru, producing thrust faults. In Colombia, Ecuador, and Peru, thrust faulting occurs along the sub-Andes due in response to contraction brought on by subduction, while in the high Andes, normal faulting occurs in response to gravitational forces.
In the extreme south, a major transform fault separates Tierra del Fuego from the small Scotia Plate.
Volcanism.
The Andes range has many active volcanoes distributed in four volcanic zones separated by areas of inactivity. The Andean volcanism is a result of the subduction of the Nazca Plate and Antarctic Plate underneath the South American Plate. The belt is subdivided into four main volcanic zones that are separated from each other by volcanic gaps. The volcanoes of the belt are diverse in terms of activity style, products, and morphology. Although some differences can be explained by which volcanic zone a volcano belongs to, there are significant differences inside volcanic zones and even between neighboring volcanoes. Despite being a typical location for calc-alkalic and subduction volcanism, the Andean Volcanic Belt has a large range of volcano-tectonic settings, such as rift systems, extensional zones, transpressional faults, subduction of mid-ocean ridges, and seamount chains apart from a large range of crustal thicknesses and magma ascent paths, and different amount of crustal assimilations.
Ore deposits and evaporites.
The Andes Mountains host large ore and salt deposits, and some of their eastern fold and thrust belts act as traps for commercially exploitable amounts of hydrocarbons. In the forelands of the Atacama Desert, some of the largest porphyry copper mineralizations occur, making Chile and Peru the first- and second-largest exporters of copper in the world. Porphyry copper in the western slopes of the Andes has been generated by hydrothermal fluids (mostly water) during the cooling of plutons or volcanic systems. The porphyry mineralization further benefited from the dry climate that reduced the disturbing actions of meteoric water. The dry climate in the central western Andes has also led to the creation of extensive saltpeter deposits that were extensively mined until the invention of synthetic nitrates. Yet another result of the dry climate are the salars of Atacama and Uyuni, the former being the largest source of lithium and the latter the world's largest reserve of the element. Early Mesozoic and Neogene plutonism in Bolivia's Cordillera Central created the Bolivian tin belt as well as the famous, now mostly depleted, silver deposits of Cerro Rico de Potosí.
Climate.
The Andes Mountains is connected to the climate of South America, particularly through the hyper-arid conditions of the adjacent Atacama Desert. The Atacama Bench, a prominent low-relief feature along the Pacific seaboard, serves as a key geomorphological record of the long-term interplay between Andean tectonics and Cenozoic climate. While the initial uplift and shortening of the Andes were driven by the subduction of the Nazca Plate beneath the South American Plate, arid climate acted as an important feedback mechanism. Reduced erosion rates in the increasingly arid Atacama region may have effectively stopped tectonic activity in certain parts of the mountain range. This lack of erosion could have facilitated the eastward propagation of deformation, leading to the widening of the Andean orogen over time. Thus, the Atacama Desert and its geological features, like the Atacama Bench, offer critical insights into the coupled evolution of the Andes Mountains and the changing regional climate.
History.
The Andes Mountains, initially inhabited by hunter-gatherers, experienced the development of agriculture and the rise of politically centralized civilizations, which culminated in the establishment of the century-long Inca Empire. This all changed in the 16th century, when the Spanish conquistadors colonized the mountains in advance of the mining economy.
In the tide of anti-imperialist nationalism, the Andes became the scene of a series of independence wars in the 19th century, when rebel forces swept through the region to overthrow Spanish colonial rule. Since then, many former Spanish territories have become five independent Andean states.
Climate and hydrology.
The climate in the Andes varies greatly depending on latitude, altitude, and proximity to the sea. Temperature, atmospheric pressure, and humidity decrease in higher elevations. The southern section is rainy and cool, while the central section is dry. The northern Andes are typically rainy and warm, with an average temperature of in Colombia. The climate is known to change drastically in rather short distances. Rainforests exist just kilometers away from the snow-covered peak of Cotopaxi. The mountains have a large effect on the temperatures of nearby areas. The snow line depends on the location. It is between in the tropical Ecuadorian, Colombian, Venezuelan, and northern Peruvian Andes, rising to in the drier mountains of southern Peru and northern Chile south to about 30°S before descending to on Aconcagua at 32°S, at 40°S, at 50°S, and only in Tierra del Fuego at 55°S; from 50°S, several of the larger glaciers descend to sea level.
The Andes of Chile and Argentina can be divided into two climatic and glaciological zones: the Dry Andes and the Wet Andes. Since the Dry Andes extend from the latitudes of the Atacama Desert to the area of the Maule River, precipitation is more sporadic, and there are strong temperature oscillations. The line of equilibrium may shift drastically over short periods of time, leaving a whole glacier in the ablation area or in the accumulation area.
In the high Andes of Central Chile and Mendoza Province, rock glaciers are larger and more common than glaciers; this is due to the high exposure to solar radiation. In these regions, glaciers occur typically at higher altitudes than rock glaciers. The lowest active rock glaciers occur at 900 m a.s.l. in Aconcagua.
Though precipitation increases with height, there are semiarid conditions in the nearly highest mountains of the Andes. This dry steppe climate is considered to be typical of the subtropical position at 32–34° S. The valley bottoms have no woods, just dwarf scrub. The largest glaciers, for example the Plomo Glacier and the Horcones Glaciers, do not even reach in length and have only insignificant ice thickness. At glacial times, however, 20,000 years ago, the glaciers were over ten times longer. On the east side of this section of the Mendozina Andes, they flowed down to and on the west side to about above sea level. The massifs of Aconcagua (), Tupungato (), and Nevado Juncal () are tens of kilometres away from each other and were connected by a joint ice stream network. The Andes' dendritic glacier arms, components of valley glaciers, were up to long and over thick, and spanned a vertical distance of . The climatic glacier snowline (ELA) was lowered from to at glacial times.
Flora.
The Andean region cuts across several natural and floristic regions, due to its extension, from Caribbean Venezuela to cold, windy, and wet Cape Horn passing through the hyperarid Atacama Desert. Rainforests and tropical dry forests used to encircle much of the northern Andes but are now greatly diminished, especially in the Chocó and inter-Andean valleys of Colombia. Opposite the humid Andean slopes are the relatively dry Andean slopes in most of western Peru, Chile, and Argentina. Along with several Interandean Valles, they are typically dominated by deciduous woodland, shrub and xeric vegetation, reaching the extreme in the slopes near the virtually lifeless Atacama Desert.
About 30,000 species of vascular plants live in the Andes, with roughly half being endemic to the region, surpassing the diversity of any other hotspot. The small tree "Cinchona pubescens", a source of quinine that is used to treat malaria, is found widely in the Andes as far south as Bolivia. Other important crops that originated from the Andes are tobacco and potatoes. The high-altitude "Polylepis" forests and woodlands are found in the Andean areas of Colombia, Ecuador, Peru, Bolivia, and Chile. These trees, by locals referred to as Queñua, Yagual, and other names, can be found at altitudes of above sea level. It remains unclear if the patchy distribution of these forests and woodlands is natural, or the result of clearing that began during the Incan period. Regardless, in modern times, the clearance has accelerated, and the trees are now considered highly endangered, with some believing that as little as 10% of the original woodland remains.
Fauna.
The Andes are rich in fauna: With almost 1,000 species, of which roughly 2/3 are endemic to the region, the Andes are the most important region in the world for amphibians. The diversity of animals in the Andes is high, with almost 600 species of mammals (13% endemic), more than 1,700 species of birds (about 1/3 endemic), more than 600 species of reptiles (about 45% endemic), and almost 400 species of fish (about 1/3 endemic).
The vicuña and guanaco can be found living in the Altiplano, while the closely related domesticated llama and alpaca are widely kept by locals as pack animals and for their meat and wool. The crepuscular (active during dawn and dusk) chinchillas, two threatened members of the rodent order, inhabit the Andes' alpine regions. The Andean condor, the largest bird of its kind in the Western Hemisphere, occurs throughout much of the Andes but generally in very low densities. Other animals found in the relatively open habitats of the high Andes include the huemul, cougar, foxes in the genus "Pseudalopex", and, for birds, certain species of tinamous (notably members of the genus "Nothoprocta"), Andean goose, giant coot, flamingos (mainly associated with hypersaline lakes), lesser rhea, Andean flicker, diademed sandpiper-plover, miners, sierra-finches and diuca-finches.
Lake Titicaca hosts several endemics, among them the highly endangered Titicaca flightless grebe and Titicaca water frog. A few species of hummingbirds, notably some hillstars, can be seen at altitudes above , but far higher diversities can be found at lower altitudes, especially in the humid Andean forests ("cloud forests") growing on slopes in Colombia, Ecuador, Peru, Bolivia, and far northwestern Argentina. These forest-types, which includes the Yungas and parts of the Chocó, are very rich in flora and fauna, although few large mammals exist, exceptions being the threatened mountain tapir, spectacled bear, and yellow-tailed woolly monkey.
Birds of humid Andean forests include mountain toucans, quetzals, and the Andean cock-of-the-rock, while mixed-species flocks dominated by tanagers and furnariids are commonly seen—in contrast to several vocal but typically cryptic species of wrens, tapaculos, and antpittas.
A number of species such as the royal cinclodes and white-browed tit-spinetail are associated with "Polylepis", and consequently also threatened.
Human activity.
The Andes Mountains form a north–south axis of cultural influences. A long series of cultural development culminated in the expansion of the Inca civilization and Inca Empire in the central Andes during the 15th century. The Incas formed this civilization through imperialistic militarism as well as careful and meticulous governmental management. The government sponsored the construction of aqueducts and roads in addition to pre-existing installations. Some of these constructions still exist today.
Devastated by European diseases and by civil war, the Incas were defeated in 1532 by an alliance composed of tens of thousands of allies from nations they had subjugated (e.g. Huancas, Chachapoyas, Cañaris) and a small army of 180 Spaniards led by Francisco Pizarro. One of the few Inca sites the Spanish never found in their conquest was Machu Picchu, which lay hidden on a peak on the eastern edge of the Andes where they descend to the Amazon. The main surviving languages of the Andean peoples are those of the Quechua and Aymara language families. Woodbine Parish and Joseph Barclay Pentland surveyed a large part of the Bolivian Andes from 1826 to 1827.
Cities.
In modern times, the largest cities in the Andes are Bogotá, with a metropolitan population of over ten million, and Santiago, Medellín, Cali, and Quito. Lima is a coastal city adjacent to the Andes and is the largest city of all Andean countries. It is the seat of the Andean Community of Nations.
La Paz, Bolivia's seat of government, is the highest capital city in the world, at an elevation of approximately . Parts of the La Paz conurbation, including the city of El Alto, extend up to .
Other cities in or near the Andes include Bariloche, Catamarca, Jujuy, Mendoza, Salta, San Juan, Tucumán, and Ushuaia in Argentina; Calama and Rancagua in Chile; Cochabamba, Oruro, Potosí, Sucre, Tarija, and Yacuiba in Bolivia; Arequipa, Cajamarca, Cusco, Huancayo, Huánuco, Huaraz, Juliaca, and Puno in Peru; Ambato, Cuenca, Ibarra, Latacunga, Loja, Riobamba, and Tulcán in Ecuador; Armenia, Cúcuta, Bucaramanga, Duitama, Ibagué, Ipiales, Manizales, Palmira, Pasto, Pereira, Popayán, Rionegro, Sogamoso, Tunja, and Villavicencio in Colombia; and Barquisimeto, La Grita, Mérida, San Cristóbal, Tovar, Trujillo, and Valera in Venezuela. The cities of Caracas, Valencia, and Maracay are in the Venezuelan Coastal Range, which is a debatable extension of the Andes at the northern extremity of South America.
Transportation.
Cities and large towns are connected with asphalt-paved roads, while smaller towns are often connected by dirt roads, which may require a four-wheel-drive vehicle.
The rough terrain has historically put the costs of building highways and railroads that cross the Andes out of reach of most neighboring countries, even with modern civil engineering practices. For example, the main crossover of the Andes between Argentina and Chile is still accomplished through the Paso Internacional Los Libertadores. Only recently have the ends of some highways that came rather close to one another from the east and the west been connected. Much of the transportation of passengers is done via aircraft.
There is one railroad that connects Chile with Peru via the Andes, however, and there are others that make the same connection via southern Bolivia.
There are multiple highways in Bolivia that cross the Andes. Some of these were built during a period of war between Bolivia and Paraguay, in order to transport Bolivian troops and their supplies to the war front in the lowlands of southeastern Bolivia and western Paraguay.
For decades, Chile claimed ownership of land on the eastern side of the Andes. These claims were given up in about 1870 during the War of the Pacific between Chile and the allied Bolivia and Peru, in a diplomatic deal to keep Peru out of the war. The Chilean Army and Chilean Navy defeated the combined forces of Bolivia and Peru, and Chile took over Bolivia's only province on the Pacific Coast, some land from Peru that was returned to Peru decades later. Bolivia has been completely landlocked ever since. It mostly uses seaports in eastern Argentina and Uruguay for international trade because its diplomatic relations with Chile have been suspended since 1978.
Because of the tortuous terrain in places, villages and towns in the mountains—to which travel via motorized vehicles is of little use—are still located in the high Andes of Chile, Bolivia, Peru, and Ecuador. Locally, the relatives of the camel, the llama, and the alpaca continue to carry out important uses as pack animals, but this use has generally diminished in modern times. Donkeys, mules, and horses are also useful.
Agriculture.
The ancient peoples of the Andes such as the Incas have practiced irrigation techniques for over 6,000 years. Because of the mountain slopes, terracing has been a common practice. Terracing, however, was only extensively employed after Incan imperial expansions to fuel their expanding realm. The potato holds a very important role as an internally consumed staple crop. Maize was also an important crop for these people, and was used for the production of chicha, important to Andean native people. Currently, tobacco, cotton, quinoa, and coffee are the main export crops. Coca, despite eradication programs in some countries, remains an important crop for legal local use in a mildly stimulating herbal tea, and illegally for the production of cocaine.
Irrigation.
In unirrigated land, pasture is the most common type of land use. In the rainy season (summer), part of the rangeland is used for cropping (mainly potatoes, barley, broad beans, and wheat).
Irrigation is helpful in advancing the sowing data of the summer crops, which guarantees an early yield in periods of food shortage. Also, by early sowing, maize can be cultivated higher up in the mountains (up to ). In addition, it makes cropping in the dry season (winter) possible and allows the cultivation of frost-resistant vegetable crops like onion and carrot.
Mining.
The Andes rose to fame for their mineral wealth during the Spanish conquest of South America. Although Andean Amerindian peoples crafted ceremonial jewelry of gold and other metals, the mineralizations of the Andes were first mined on a large scale after the Spanish arrival. Potosí in present-day Bolivia and Cerro de Pasco in Peru were among the principal mines of the Spanish Empire in the New World. Río de la Plata and Argentina derive their names from the silver of Potosí.
Currently, mining in the Andes of Chile and Peru places these countries as the first and second major producers of copper in the world. Peru also contains the 4th-largest goldmine in the world: the Yanacocha. The Bolivian Andes principally produce tin, although historically silver mining had a huge impact on the economy of 17th-century Europe. In Chile in the higher portions of the Andes there are only mining districs dominated by large-scale mining, while medium and small-scale mining is more common at lower altitudes. For mines in the high Andes there are logistical difficulties in the use of sea water, in addition to increased probabilities of extreme weather events that may disrupt water supply. The gold deposits of the El Indio Gold Belt tend to lie along the Argentina–Chile border and next to or below glaciers and gold mining there have thus issues relating to the bi-nationality and their environmental impacts on glaciers.
Mining in the cold conditions in the Andes pose also difficult conditions for outdoor workers such as pallaqueras and for the batteries of electrified machinery.
There is a long history of mining in the Andes, from the Spanish silver mines in Potosí in the 16th century to the vast current porphyry copper deposits of Chuquicamata and Escondida in Chile and Toquepala in Peru. Other metals, including iron, gold, and tin, in addition to non-metallic resources are important. The Andes have a vast supply of lithium; Argentina, Bolivia, and Chile have the three largest reserves in the world respectively.
Peaks.
This list contains some of the major peaks in the Andes mountain range. The highest peak is Aconcagua of Argentina.
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Ancylopoda
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Ancylopoda is a group of browsing, herbivorous, mammals in the Perissodactyla that show long, curved and cleft claws. Morphological evidence indicates the Ancylopoda diverged from the tapirs, rhinoceroses and horses (Euperissodactyla) after the Brontotheria; however, earlier authorities such as Osborn sometimes considered the Ancylopoda to be outside Perissodactyla or, as was popular more recently, to be related to Brontotheriidae.
"Macrotherium", which is typically from the middle Miocene of Sansan, in Gers, France, may indicate a distinct genus. Limb-bones resembling those of "Macrotherium", but relatively stouter, have been described from the Pliocene beds of Attica and Samos as "Ancylotherium". In the Americas, the names "Morothorium" and "Moropus" have been applied to similar bones, in the belief that they indicated xenarthrans. "Macrotherium magnum" must have been an animal of about in length.
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Anchor
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An anchor is a device, normally made of metal, used to secure a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin "", which itself comes from the Greek ().
Anchors can either be temporary or permanent. Permanent anchors are used in the creation of a mooring, and are rarely moved; a specialist service is normally needed to move or maintain them. Vessels carry one or more temporary anchors, which may be of different designs and weights.
A sea anchor is a drag device, not in contact with the seabed, used to minimize drift of a vessel relative to the water. A drogue is a drag device used to slow or help steer a vessel running before a storm in a following or overtaking sea, or when crossing a bar in a breaking sea.
Anchoring.
Anchors achieve holding power either by "hooking" into the seabed, or weight, or a combination of the two. The weight of the anchor chain can be more than that of the anchor and is critical to proper holding. Permanent moorings use large masses (commonly a block or slab of concrete) resting on the seabed. Semi-permanent mooring anchors (such as mushroom anchors) and large ship's anchors derive a significant portion of their holding power from their weight, while also hooking or embedding in the bottom. Modern anchors for smaller vessels have metal "flukes" that hook on to rocks on the bottom or bury themselves in soft seabed.
The vessel is attached to the anchor by the "rode" (also called a "cable" or a "warp"). It can be made of rope, chain or a combination of rope and chain. The ratio of the length of rode to the water depth is known as the scope.
Holding ground is the area of sea floor that holds an anchor, and thus the attached ship or boat. Different types of anchor are designed to hold in different types of holding ground. Some bottom materials hold better than others; for instance, hard sand holds well, shell holds poorly. Holding ground may be fouled with obstacles. An anchorage location may be chosen for its holding ground. In poor holding ground, only the weight of an anchor and chain matters; in good holding ground, it is able to dig in, and the holding power can be significantly higher.
The basic anchoring consists of determining the location, dropping the anchor, laying out the scope, setting the hook, and assessing where the vessel ends up. The ship seeks a location that is sufficiently protected; has suitable holding ground, enough depth at low tide and enough room for the boat to swing.
The location to drop the anchor should be approached from down wind or down current, whichever is stronger. As the chosen spot is approached, the vessel should be stopped or even beginning to drift back. The anchor should initially be lowered quickly but under control until it is on the bottom (see anchor windlass). The vessel should continue to drift back, and the cable should be veered out under control (slowly) so it is relatively straight.
Once the desired scope is laid out, the vessel should be gently forced astern, usually using the auxiliary motor but possibly by backing a sail. A hand on the anchor line may telegraph a series of jerks and jolts, indicating the anchor is dragging, or a smooth tension indicative of digging in. As the anchor begins to dig in and resist backward force, the engine may be throttled up to get a thorough set. If the anchor continues to drag, or sets after having dragged too far, it should be retrieved and moved back to the desired position (or another location chosen.)
Using an anchor weight, kellet or sentinel.
Lowering a concentrated, heavy weight down the anchor line – rope or chain – directly in front of the bow to the seabed behaves like a heavy chain rode and lowers the angle of pull on the anchor. If the weight is suspended off the seabed it acts as a spring or shock absorber to dampen the sudden actions that are normally transmitted to the anchor and can cause it to dislodge and drag. In light conditions, a kellet reduces the swing of the vessel considerably. In heavier conditions these effects disappear as the rode becomes straightened and the weight ineffective. Known as an "anchor chum weight" or "angel" in the UK.
Forked moor.
Using two anchors set approximately 45° apart, or wider angles up to 90°, from the bow is a strong mooring for facing into strong winds. To set anchors in this way, first one anchor is set in the normal fashion. Then, taking in on the first cable as the boat is motored into the wind and letting slack while drifting back, a second anchor is set approximately a half-scope away from the first on a line perpendicular to the wind. After this second anchor is set, the scope on the first is taken up until the vessel is lying between the two anchors and the load is taken equally on each cable.
This moor also to some degree limits the range of a vessel's swing to a narrower oval. Care should be taken that other vessels do not swing down on the boat due to the limited swing range.
Bow and stern.
(Not to be mistaken with the "Bahamian moor", below.) In the "bow and stern" technique, an anchor is set off each the bow and the stern, which can severely limit a vessel's swing range and also align it to steady wind, current or wave conditions. One method of accomplishing this moor is to set a bow anchor normally, then drop back to the limit of the bow cable (or to double the desired scope, e.g. 8:1 if the eventual scope should be 4:1, 10:1 if the eventual scope should be 5:1, etc.) to lower a stern anchor. By taking up on the bow cable the stern anchor can be set. After both anchors are set, tension is taken up on both cables to limit the swing or to align the vessel.
Bahamian moor.
Similar to the above, a "Bahamian moor" is used to sharply limit the swing range of a vessel, but allows it to swing to a current. One of the primary characteristics of this technique is the use of a swivel as follows: the first anchor is set normally, and the vessel drops back to the limit of anchor cable. A second anchor is attached to the end of the anchor cable, and is dropped and set. A swivel is attached to the middle of the anchor cable, and the vessel connected to that.
The vessel now swings in the middle of two anchors, which is acceptable in strong reversing currents, but a wind perpendicular to the current may break out the anchors, as they are not aligned for this load.
Backing an anchor.
Also known as "tandem anchoring", in this technique two anchors are deployed in line with each other, on the same rode. With the foremost anchor reducing the load on the aft-most, this technique can develop great holding power and may be appropriate in "ultimate storm" circumstances. It does not limit swinging range, and might not be suitable in some circumstances. There are complications, and the technique requires careful preparation and a level of skill and experience above that required for a single anchor.
Kedging.
"Kedging" or "warping" is a technique for moving or turning a ship by using a relatively light anchor.
In yachts, a kedge anchor is an anchor carried in addition to the main, or bower, anchor, and usually stowed aft. Every yacht should carry at least two anchors – the main or "bower" anchor and a second lighter "kedge" anchor. It is used occasionally when it is necessary to limit the turning circle as the yacht swings when it is anchored, such as in a narrow river or a deep pool in an otherwise shallow area. Kedge anchors are sometimes used to recover vessels that have run aground.
For ships, a kedge may be dropped while a ship is underway, or carried out in a suitable direction by a tender or ship's boat to enable the ship to be winched off if aground or swung into a particular heading, or even to be held steady against a tidal or other stream.
Historically, it was of particular relevance to sailing warships that used them to outmaneuver opponents when the wind had dropped but might be used by any vessel in confined, shoal water to place it in a more desirable position, provided she had enough manpower.
Club hauling.
Club hauling is an archaic technique. When a vessel is in a narrow channel or on a lee shore so that there is no room to tack the vessel in a conventional manner, an anchor attached to the lee quarter may be dropped from the lee bow. This is deployed when the vessel is head to wind and has lost headway. As the vessel gathers sternway the strain on the cable pivots the vessel around what is now the weather quarter turning the vessel onto the other tack. The anchor is then normally cut away (the ship's momentum prevents recovery without aborting the maneuver).
Multiple anchor patterns.
When it is necessary to moor a ship or floating platform with precise positioning and alignment, such as when drilling the seabed, for some types of salvage work, and for some types of diving operation, several anchors are set in a pattern which allows the vessel to be positioned by shortening and lengthening the scope of the anchors, and adjusting the tension on the rodes. The anchors are usually laid in prearranged positions by an anchor tender, and the moored vessel uses its own winches to adjust position and tension.
Similar arrangements are used for some types of single buoy moorings, like the catenary anchor leg mooring (CALM) used for loading and unloading liquid cargoes.
Weighing anchor.
Since all anchors that embed themselves in the bottom require the strain to be along the seabed, anchors can be broken out of the bottom by shortening the rope until the vessel is directly above the anchor; at this point the anchor chain is "up and down", in naval parlance. If necessary, motoring slowly around the location of the anchor also helps dislodge it. Anchors are sometimes fitted with a trip line attached to the crown, by which they can be unhooked from underwater hazards.
The term "aweigh" describes an anchor when it is hanging on the rope and not resting on the bottom. This is linked to the term "to weigh anchor", meaning to lift the anchor from the sea bed, allowing the ship or boat to move. An anchor is described as "aweigh" when it has been broken out of the bottom and is being hauled up to be "stowed". "Aweigh" should not be confused with "under way", which describes a vessel that is not "moored" to a dock or "anchored", whether or not the vessel is moving through the water. "Aweigh" is also often confused with "away", which is incorrect.
History.
Evolution of the anchor.
The earliest anchors were probably rocks, and many rock anchors have been found dating from at least the Bronze Age. Pre-European Māori waka (canoes) used one or more hollowed stones, tied with flax ropes, as anchors. Many modern moorings still rely on a large rock as the primary element of their design. However, using pure weight to resist the forces of a storm works well only as a permanent mooring; a large enough rock would be nearly impossible to move to a new location.
The ancient Greeks used baskets of stones, large sacks filled with sand, and wooden logs filled with lead. According to Apollonius Rhodius and Stephen of Byzantium, anchors were formed of stone, and Athenaeus states that they were also sometimes made of wood. Such anchors held the vessel merely by their weight and by their friction along the bottom.
Fluked anchors.
Iron was afterwards introduced for the construction of anchors, and an improvement was made by forming them with teeth, or "flukes", to fasten themselves into the bottom. This is the iconic anchor shape most familiar to non-sailors.
This form has been used since antiquity. The Roman Nemi ships of the 1st century AD used this form. The Viking Ladby ship (probably 10th century) used a fluked anchor of this type, made of iron, which would have had a wooden stock mounted perpendicular to the shank and flukes to make the flukes contact the bottom at a suitable angle to hook or penetrate.
Admiralty anchor.
The Admiralty Pattern anchor, or simply "Admiralty", also known as a "Fisherman", consists of a central shank with a ring or shackle for attaching the rode (the rope, chain, or cable connecting the ship and the anchor). At the other end of the shank there are two arms, carrying the flukes, while the stock is mounted to the shackle end, at ninety degrees to the arms. When the anchor lands on the bottom, it generally falls over with the arms parallel to the seabed. As a strain comes onto the rope, the stock digs into the bottom, canting the anchor until one of the flukes catches and digs into the bottom.
The Admiralty Anchor is an entirely independent reinvention of a classical design, as seen in one of the Nemi ship anchors. This basic design remained unchanged for centuries, with the most significant changes being to the overall proportions, and a move from stocks made of wood to iron stocks in the late 1830s and early 1840s.
Since one fluke always protrudes up from the set anchor, there is a great tendency of the rode to foul the anchor as the vessel swings due to wind or current shifts. When this happens, the anchor may be pulled out of the bottom, and in some cases may need to be hauled up to be re-set. In the mid-19th century, numerous modifications were attempted to alleviate these problems, as well as improve holding power, including one-armed mooring anchors. The most successful of these "patent anchors", the Trotman Anchor, introduced a pivot at the centre of the crown where the arms join the shank, allowing the "idle" upper arm to fold against the shank. When deployed the lower arm may fold against the shank tilting the tip of the fluke upwards, so each fluke has a tripping palm at its base, to hook on the bottom as the folded arm drags along the seabed, which unfolds the downward oriented arm until the tip of the fluke can engage the bottom.
Handling and storage of these anchors requires special equipment and procedures. Once the anchor is hauled up to the hawsepipe, the ring end is hoisted up to the end of a timber projecting from the bow known as the cathead. The crown of the anchor is then hauled up with a heavy tackle until one fluke can be hooked over the rail. This is known as "catting and fishing" the anchor. Before dropping the anchor, the fishing process is reversed, and the anchor is dropped from the end of the cathead.
Stockless anchor.
The stockless anchor, patented in England in 1821, represented the first significant departure in anchor design in centuries. Although their holding-power-to-weight ratio is significantly lower than admiralty pattern anchors, their ease of handling and stowage aboard large ships led to almost universal adoption. In contrast to the elaborate stowage procedures for earlier anchors, stockless anchors are simply hauled up until they rest with the shank inside the hawsepipes, and the flukes against the hull (or inside a recess in the hull called the anchor box).
While there are numerous variations, stockless anchors consist of a set of heavy flukes connected by a pivot or ball and socket joint to a shank. Cast into the crown of the anchor is a set of tripping palms, projections that drag on the bottom, forcing the main flukes to dig in.
Small boat anchors.
Until the mid-20th century, anchors for smaller vessels were either scaled-down versions of admiralty anchors, or simple grapnels. As new designs with greater holding-power-to-weight ratios were sought, a great variety of anchor designs have emerged. Many of these designs are still under patent, and other types are best known by their original trademarked names.
Grapnel anchor / drag.
A traditional design, the grapnel is merely a shank (no stock) with four or more tines, also known as a "drag". It has a benefit in that, no matter how it reaches the bottom, one or more tines are aimed to set. In coral, or rock, it is often able to set quickly by hooking into the structure, but may be more difficult to retrieve. A grapnel is often quite light, and may have additional uses as a tool to recover gear lost overboard. Its weight also makes it relatively easy to move and carry, however its shape is generally not compact and it may be awkward to stow unless a collapsing model is used.
Grapnels rarely have enough fluke area to develop much hold in sand, clay, or mud. It is not unknown for the anchor to foul on its own rode, or to foul the tines with refuse from the bottom, preventing it from digging in. On the other hand, it is quite possible for this anchor to find such a good hook that, without a trip line from the crown, it is impossible to retrieve.
Herreshoff anchor.
Designed by yacht designer L. Francis Herreshoff, this is essentially the same pattern as an admiralty anchor, albeit with small diamond-shaped flukes or palms. The novelty of the design lay in the means by which it could be broken down into three pieces for stowage. In use, it still presents all the issues of the admiralty pattern anchor.
Northill anchor.
Originally designed as a lightweight anchor for seaplanes, this design consists of two plough-like blades mounted to a shank, with a folding stock crossing through the crown of the anchor.
CQR plough anchor.
Many manufacturers produce a plough-type anchor, so-named after its resemblance to an agricultural plough. All such anchors are copied from the original CQR ("Coastal Quick Release", or "Clyde Quick Release", later rebranded as 'secure' by Lewmar), a 1933 design patented in the UK by mathematician Geoffrey Ingram Taylor.
Plough anchors stow conveniently in a roller at the bow, and have been popular with cruising sailors and private boaters. Ploughs can be moderately good in all types of seafloor, though not exceptional in any. Contrary to popular belief, the CQR's hinged shank is not to allow the anchor to turn with direction changes rather than breaking out, but actually to prevent the shank's weight from disrupting the fluke's orientation while setting. The hinge can wear out and may trap a sailor's fingers. Some later plough anchors have a rigid shank, such as the Lewmar's "Delta".
A plough anchor has a fundamental flaw: like its namesake, the agricultural plough, it digs in but then tends to break out back to the surface. Plough anchors sometimes have difficulty setting at all, and instead skip across the seafloor. By contrast, modern efficient anchors tend to be "scoop" types that dig ever deeper.
Delta anchor.
The Delta anchor was derived from the CQR. It was patented by Philip McCarron, James Stewart, and Gordon Lyall of British marine manufacturer Simpson-Lawrence Ltd in 1992. It was designed as an advance over the anchors used for floating systems such as oil rigs. It retains the weighted tip of the CQR but has a much higher fluke area to weight ratio than its predecessor. The designers also eliminated the sometimes troublesome hinge. It is a plough anchor with a rigid, arched shank. It is described as "self-launching" because it can be dropped from a bow roller simply by paying out the rode, without manual assistance. This is an oft copied design with the European Brake and Australian Sarca Excel being two of the more notable ones. Although it is a plough type anchor, it sets and holds reasonably well in hard bottoms.
Danforth anchor.
American Richard Danforth invented the Danforth Anchor in the 1940s for use aboard landing craft. It uses a stock at the crown to which two large flat triangular flukes are attached. The stock is hinged so the flukes can orient toward the bottom (and on some designs may be adjusted for an optimal angle depending on the bottom type). Tripping palms at the crown act to tip the flukes into the seabed. The design is a burying variety, and once well set can develop high resistance. Its lightweight and compact flat design make it easy to retrieve and relatively easy to store; some anchor rollers and hawsepipes can accommodate a fluke-style anchor.
A Danforth does not usually penetrate or hold in gravel or weeds. In boulders and coral it may hold by acting as a hook. If there is much current, or if the vessel is moving while dropping the anchor, it may "kite" or "skate" over the bottom due to the large fluke area acting as a sail or wing.
The FOB HP anchor designed in Brittany in the 1970s is a Danforth variant designed to give increased holding through its use of rounded flukes setting at a 30° angle.
The Fortress is an American aluminum alloy Danforth variant that can be disassembled for storage and it features an adjustable 32° and 45° shank/fluke angle to improve holding capability in common sea bottoms such as hard sand and soft mud. This anchor performed well in a 1989 US Naval Sea Systems Command (NAVSEA) test and in an August 2014 holding power test that was conducted in the soft mud bottoms of the Chesapeake Bay.
Bruce or claw anchor.
This claw-shaped anchor was designed by Peter Bruce from Scotland in the 1970s. Bruce gained his early reputation from the production of large-scale commercial anchors for ships and fixed installations such as oil rigs. It was later scaled down for small boats, and copies of this popular design abound. The Bruce and its copies, known generically as "claw type anchors", have been adopted on smaller boats (partly because they stow easily on a bow roller) but they are most effective in larger sizes. Claw anchors are quite popular on charter fleets as they have a high chance to set on the first try in many bottoms. They have the reputation of not breaking out with tide or wind changes, instead slowly turning in the bottom to align with the force.
Bruce anchors can have difficulty penetrating weedy bottoms and grass. They offer a fairly low holding-power-to-weight ratio and generally have to be oversized to compete with newer types.
Scoop type anchors.
Three time circumnavigator German Rolf Kaczirek invented the Bügel Anker in the 1980s. Kaczirek wanted an anchor that was self-righting without necessitating a ballasted tip. Instead, he added a roll bar and switched out the plough share for a flat blade design. As none of the innovations of this anchor were patented, copies of it abound.
Alain Poiraud of France introduced the scoop type anchor in 1996. Similar in design to the Bügel anchor, Poiraud's design features a concave fluke shaped like the blade of a shovel, with a shank attached parallel to the fluke, and the load applied toward the digging end. It is designed to dig into the bottom like a shovel, and dig deeper as more pressure is applied. The common challenge with all the scoop type anchors is that they set so well, they can be difficult to weigh.
Permanent anchors.
These are used where the vessel is permanently or semi-permanently sited, for example in the case of lightvessels or channel marker buoys. The anchor needs to hold the vessel in all weathers, including the most severe storm, but needs to be lifted only occasionally, at most – for example, only if the vessel is to be towed into port for maintenance. An alternative to using an anchor under these circumstances, especially if the anchor need never be lifted at all, may be to use a pile that is driven into the seabed.
Permanent anchors come in a wide range of types and have no standard form. A slab of rock with an iron staple in it to attach a chain to would serve the purpose, as would any dense object of appropriate weight (for instance, an engine block). Modern moorings may be anchored by augers, which look and act like oversized screws drilled into the seabed, or by barbed metal beams pounded in (or even driven in with explosives) like pilings, or by a variety of other non-mass means of getting a grip on the bottom. One method of building a mooring is to use three or more conventional anchors laid out with short lengths of chain attached to a swivel, so no matter which direction the vessel moves, one or more anchors are aligned to resist the force.
Mushroom.
The mushroom anchor is suitable where the seabed is composed of silt or fine sand. It was invented by Robert Stevenson, for use by an 82-ton converted fishing boat, "Pharos", which was used as a lightvessel between 1807 and 1810 near to Bell Rock whilst the lighthouse was being constructed. It was equipped with a 1.5-ton example.
It is shaped like an inverted mushroom, the head becoming buried in the silt. A counterweight is often provided at the other end of the shank to lay it down before it becomes buried.
A mushroom anchor normally sinks in the silt to the point where it has displaced its own weight in bottom material, thus greatly increasing its holding power. These anchors are suitable only for a silt or mud bottom, since they rely upon suction and cohesion of the bottom material, which rocky or coarse sand bottoms lack. The holding power of this anchor is at best about twice its weight until it becomes buried, when it can be as much as ten times its weight. They are available in sizes from about 5 kg up to several tons.
Deadweight.
A deadweight is an anchor that relies solely on being a heavy weight. It is usually just a large block of concrete or stone at the end of the chain. Its holding power is defined by its weight underwater (i.e., taking its buoyancy into account) regardless of the type of seabed, although suction can increase this if it becomes buried. Consequently, deadweight anchors are used where mushroom anchors are unsuitable, for example in rock, gravel or coarse sand. An advantage of a deadweight anchor over a mushroom is that if it does drag, it continues to provide its original holding force. The disadvantage of using deadweight anchors in conditions where a mushroom anchor could be used is that it needs to be around ten times the weight of the equivalent mushroom anchor.
Auger.
Auger anchors can be used to anchor permanent moorings, floating docks, fish farms, etc. These anchors, which have one or more slightly pitched self-drilling threads, must be screwed into the seabed with the use of a tool, so require access to the bottom, either at low tide or by use of a diver. Hence they can be difficult to install in deep water without special equipment.
Weight for weight, augers have a higher holding than other permanent designs, and so can be cheap and relatively easily installed, although difficult to set in extremely soft mud.
High-holding-types.
There is a need in the oil-and-gas industry to resist large anchoring forces when laying pipelines and for drilling vessels. These anchors are installed and removed using a support tug and pennant/pendant wire. Some examples are the Stevin range supplied by Vrijhof Ankers. Large plate anchors such as the Stevmanta are used for permanent moorings.
Anchoring gear.
The elements of anchoring gear include the anchor, the cable (also called a "rode"), the method of attaching the two together, the method of attaching the cable to the ship, charts, and a method of learning the depth of the water.
Vessels may carry a number of anchors: "bower anchors" are the main anchors used by a vessel and normally carried at the bow of the vessel. A "kedge anchor" is a light anchor used for warping an anchor, also known as "kedging", or more commonly on yachts for mooring quickly or in benign conditions. A "stream anchor", which is usually heavier than a "kedge anchor", can be used for kedging or warping in addition to temporary mooring and restraining stern movement in tidal conditions or in waters where vessel movement needs to be restricted, such as rivers and channels.
Charts are vital to good anchoring. Knowing the location of potential dangers, as well as being useful in estimating the effects of weather and tide in the anchorage, is essential in choosing a good place to drop the hook. One can get by without referring to charts, but they are an important tool and a part of good anchoring gear, and a skilled mariner would not choose to anchor without them.
Anchor rode.
The anchor rode (or "cable" or "warp") that connects the anchor to the vessel is usually made up of chain, rope, or a combination of those. Large ships use only chain rode. Smaller craft might use a rope/chain combination or an all chain rode. All rodes should have some chain; chain is heavy but it resists abrasion from coral, sharp rocks, or shellfish beds, whereas a rope warp is susceptible to abrasion and can fail in a short time when stretched against an abrasive surface. The weight of the chain also helps keep the direction of pull on the anchor closer to horizontal, which improves holding, and absorbs part of snubbing loads. Where weight is not an issue, a heavier chain provides better holding by forming a catenary curve through the water and resting as much of its length on the bottom as would not be lifted by tension of the mooring load. Any changes to the tension are accommodated by additional chain being lifted or settling on the bottom, and this absorbs shock loads until the chain is straight, at which point the full load is taken by the anchor. Additional dissipation of shock loads can be achieved by fitting a snubber between the chain and a bollard or cleat on deck. This also reduces shock loads on the deck fittings, and the vessel usually lies more comfortably and quietly.
Being strong and elastic, nylon rope is the most suitable as an anchor rode. Polyester (terylene) is stronger but less elastic than nylon. Both materials sink, so they avoid fouling other craft in crowded anchorages and do not absorb much water. Neither breaks down quickly in sunlight. Elasticity helps absorb shock loading, but causes faster abrasive wear when the rope stretches over an abrasive surface, like a coral bottom or a poorly designed chock. Polypropylene ("polyprop") is not suited to rodes because it floats and is much weaker than nylon, being barely stronger than natural fibres. Some grades of polypropylene break down in sunlight and become hard, weak, and unpleasant to handle. Natural fibres such as manila or hemp are still used in developing nations but absorb a lot of water, are relatively weak, and rot, although they do give good handling grip and are often relatively cheap. Ropes that have little or no elasticity are not suitable as anchor rodes. Elasticity is partly a function of the fibre material and partly of the rope structure.
All anchors should have chain at least equal to the boat's length. Some skippers prefer an all chain warp for greater security on coral or sharp edged rock bottoms. The chain should be shackled to the warp through a steel eye or spliced to the chain using a chain splice. The shackle pin should be securely wired or moused. Either galvanized or stainless steel is suitable for eyes and shackles, galvanized steel being the stronger of the two. Some skippers prefer to add a swivel to the rode. There is a school of thought that says these should not be connected to the anchor itself, but should be somewhere in the chain. However, most skippers connect the swivel directly to the anchor.
Scope.
Scope is the ratio of length of the rode to the depth of the water measured from the highest point (usually the anchor roller or bow chock) to the seabed, making allowance for the highest expected tide. When making this ratio large enough, one can ensure that the pull on the anchor is as horizontal as possible. This will make it unlikely for the anchor to break out of the bottom and drag, if it was properly embedded in the seabed to begin with. When deploying chain, a large enough scope leads to a load that is entirely horizontal, whilst an anchor rode made only of rope will never achieve a strictly horizontal pull.
In moderate conditions, the ratio of rode to water depth should be 4:1 – where there is sufficient swing-room, a greater scope is always better. In rougher conditions it should be up to twice this with the extra length giving more stretch and a smaller angle to the bottom to resist the anchor breaking out. For example, if the water is deep, and the anchor roller is above the water, then the 'depth' is 9 meters (~30 feet). The amount of rode to let out in moderate conditions is thus 36 meters (120 feet). (For this reason, it is important to have a reliable and accurate method of measuring the depth of water.)
When using a rope rode, there is a simple way to estimate the scope: The ratio of bow height of the rode to length of rode above the water while lying back hard on the anchor is the same or less than the scope ratio. The basis for this is simple geometry (Intercept Theorem): The ratio between two sides of a triangle stays the same regardless of the size of the triangle as long as the angles do not change.
Generally, the rode should be between 5 and 10 times the depth to the seabed, giving a scope of 5:1 or 10:1; the larger the number, the shallower the angle is between the cable and the seafloor, and the less upwards force is acting on the anchor. A 10:1 scope gives the greatest holding power, but also allows for much more drifting about due to the longer amount of cable paid out. Anchoring with sufficient scope and/or heavy chain rode brings the direction of strain close to parallel with the seabed. This is particularly important for light, modern anchors designed to bury in the bottom, where scopes of 5:1 to 7:1 are common, whereas heavy anchors and moorings can use a scope of 3:1, or less. Some modern anchors, such as the Ultra holds with a scope of 3:1; but, unless the anchorage is crowded, a longer scope always reduces shock stresses.
A major disadvantage of the concept of scope is that it does not take into account the fact that a chain is forming a catenary when hanging between two points (i.e., bow roller and the point where the chain hits the seabed), and thus is a non-linear curve (in fact, a cosh() function), whereas scope is a linear function. As a consequence, in deep water the scope needed will be less, whilst in very shallow water the scope must be chosen much larger to achieve the same pulling angle at the anchor shank. For this reason, the British Admiralty does not use a linear scope formula, but a square root formula instead.
A couple of online calculators exist to work out the amount of chain and rope needed to achieve a (possibly nearly) horizontal pull at the anchor shank, and the associated anchor load.
As symbol.
An anchor frequently appears on the flags and coats of arms of institutions involved with the sea, as well as of port cities and seacoast regions and provinces in various countries. There also exists in heraldry the "Anchored Cross", or Mariner's Cross, a stylized cross in the shape of an anchor. The symbol can be used to signify 'fresh start' or 'hope'.
The Mariner's Cross is also referred to as St. Clement's Cross, in reference to the way this saint was killed (being tied to an anchor and thrown from a boat into the Black Sea in 102). Anchored crosses are occasionally a feature of coats of arms in which context they are referred to by the heraldic terms "anchry" or "ancre".
The Unicode anchor (Miscellaneous Symbols) is represented by: .
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Anbar (town)
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Anbar (, ) was an ancient and medieval town in central Iraq. It played a role in the Roman–Persian Wars of the 3rd–4th centuries, and briefly became the capital of the Abbasid Caliphate before the founding of Baghdad in 762. It remained a moderately prosperous town through the 10th century, but quickly declined thereafter. As a local administrative centre, it survived until the 14th century, but was later abandoned.
Its ruins are near modern Fallujah. The city gives its name to the Al-Anbar Governorate.
History.
Origins.
The city is located on the left bank of the Middle Euphrates, at the junction with the Nahr Isa canal, the first of the navigable canals that link the Euphrates to the River Tigris to the east. The origins of the city are unknown, but ancient, perhaps dating to the Babylonian era and even earlier: the local artificial mound of Tell Aswad dates to .
Sasanian period.
The town was originally known as Misiche (Greek: ), Mesiche (), or Massice ( mšyk; mšyk). As a major crossing point of the Euphrates, and occupying the northernmost point of the complex irrigation network of the Sawad, the town was of considerable strategic significance. As the western gate to central Mesopotamia, it was fortified by the Sasanian ruler Shapur I () to shield his capital, Ctesiphon, from the Roman Empire. After his decisive victory over the Roman emperor Gordian III at the Battle of Misiche in 244, Shapur renamed the town to Peroz-Shapur ("Pērōz-Šāpūr" or "Pērōz-Šābuhr", from , meaning "victorious Shapur"; in ; in ). It became known as Pirisapora or Bersabora () to the Greeks and Romans.
The city was fortified by a double wall, possibly through the use of Roman prisoner labour; it was sacked and burned after an agreement with its garrison in March 363 by the Roman emperor Julian during his invasion of the Sasanian Empire. It was rebuilt by Shapur II. By 420, it is attested as a bishopric, both for the Church of the East and for the Syriac Orthodox Church. The town's garrison was Persian, but it also contained sizeable Arab and Jewish populations. Anbar was adjacent or identical to the Babylonian Jewish center of Nehardea (), and lies a short distance from the present-day town of Fallujah, formerly the Babylonian Jewish center of Pumbedita ().
Islamic period.
The city fell to the Rashidun Caliphate in July 633, after a fiercely fought siege. When Ali ibn Abi Talib (r. 656–661) passed through the city, he was warmly welcomed by ninety-thousand Jews who then lived there, and he "received them with great friendliness."
The Arabs retained the name ("Fīrūz Shābūr") for the surrounding district, but the town itself became known as Anbar (Middle Persian word for "granary" or "storehouse") from the granaries in its citadel, a name that had appeared already during the 6th century. According to Baladhuri, the third mosque to be built in Iraq was erected in the city by Sa'd ibn Abi Waqqas. Ibn Abi Waqqas initially considered Anbar as a candidate for the location of one of the first Muslim garrison towns, but the fever and fleas endemic in the area persuaded him otherwise.
According to medieval Arabic sources, most of the inhabitants of the town migrated north to found the city of Hdatta south of Mosul. The famous governor al-Hajjaj ibn Yusuf cleared the canals of the city.
Abu'l-Abbas as-Saffah (), the founder of the Abbasid Caliphate, made it his capital in 752, constructing a new town half a "farsakh" () to the north for his Khurasani troops. There he died and was buried at the palace he had built. His successor, al-Mansur (), remained in the city until the founding of Baghdad in 762. The Abbasids also dug the great Nahr Isa canal to the south of the city, which carried water and commerce east to Baghdad. The Nahr al-Saqlawiyya or Nahr al-Qarma canal, which branches off from the Euphrates to the west of the city, is sometimes erroneously held to be the Nahr Isa, but it is more likely that it is to be identified with the pre-Islamic Nahr al-Rufayl.
It continued to be a place of much importance throughout the Abbasid period. Caliph Harun al-Rashid () stayed at the town in 799 and in 803. The town's prosperity was founded on agricultural activities, but also on trade between Iraq and Syria. The town was still prosperous in the early 9th century, but the decline of Abbasid authority during the later 9th century exposed it to Bedouin attacks in 882 and 899. In 927, the Qarmatians under Abu Tahir al-Jannabi sacked the city during their invasion of Iraq, and the devastation was compounded by another Bedouin attack two years later. The town's decline accelerated after that: while the early 10th-century geographer Istakhri still calls the town modest but populous, with the ruins of the buildings of as-Saffah still visible, Ibn Hawqal and al-Maqdisi, who wrote a generation later, attest to its decline, and the diminution of its population.
The town was sacked again in 1262 by the Mongols under Kerboka. The Ilkhanids retained Anbar as an administrative centre, a role it retained until the first half of the 14th century; the Ilkhanid minister Shams al-Din Juvayni had a canal dug from the city to Najaf, and the city was surrounded by a wall of sun-dried bricks.
Ecclesiastical history.
Anbar used to host an Assyrian community from the fifth century: the town was the seat of a bishopric of the Church of the East. The names of fourteen of its bishops of the period 486–1074 are known, three of whom became Chaldean Patriarchs of Babylon.
Titular see.
Anbar is listed by the Catholic Church as a titular see of the Chaldean Catholic Church, established as titular bishopric in 1980.
It has had the following incumbents:
Today.
It is now entirely deserted, occupied only by mounds of ruins, whose great number indicate the city's former importance. Its ruins are northwest of Fallujah, with a circumference of some . The remains include traces of the late medieval wall, a square fortification, and the early Islamic mosque.
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Anazarbus
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Anazarbus, also known as Justinopolis (, medieval Ain Zarba; modern Anavarza; ), was an ancient Cilician city. Under the late Roman Empire, it was the capital of Cilicia Secunda. Roman emperor Justinian I rebuilt the city in 527 after a strong earthquake hit it. It was destroyed in 1374 by the forces of the Mamluk Empire, after their conquest of Cilician Armenia.
Location.
It was situated in Anatolia in modern Turkey, in the present Çukurova (or classical Aleian plain) about 15 km west of the main stream of the present Ceyhan River (or classical Pyramus river) and near its tributary the Sempas Su.
A lofty isolated ridge formed its acropolis. Though some of the masonry in the ruins is certainly pre-Roman, the Suda's identification of it with Cyinda, famous as a treasure city in the wars of Eumenes of Cardia, cannot be accepted in the face of Strabo's express location of Cyinda in western Cilicia.
History.
According to the "Suda", the original name of the place was Cyinda or Kyinda or Quinda (); and that it was next called Diocaesarea (Διοκαισάρεια). A city in Cilicia called Kundu rebelled against the Assyrian king Esarhaddon in 7th century BC, but it's unclear if there is a connection. At least it's known a city called Anazarbus (Ἀνάζαρβος) and Anazarba (Ἀνάζαρβα) and Anazarbon (Ἀνάζαρβον), situated on the river Pyramus, existed in the first century BC and was a part of the small client-kingdom of Tarcondimotus I until it was annexed by Rome. How the city obtained the name is a matter of conjecture. According to Stephanus of Byzantium, after the city was destroyed by an earthquake, the emperor Nerva sent thither one Anazarbus, a man of senatorial rank, who rebuilt the city, and gave to it his name. This account cannot be accurate, as Valesius remarks, for it was called Anazarbus in Pliny's time. There are three writers of antiquity from this city. Pedanius Dioscorides is called a native of Anazarbus; but the period of Dioscorides is not certain. It was also the home of the poet Oppian and the historian Asclepiades of Anazarba. Its later name was Caesarea ad Anazarbum, and there are many medals of the place in which it is both named Anazarbus and Caesarea at or under Anazarbus. On the division of Cilicia it became the chief place of the Roman province of Cilicia Secunda, with the title of Metropolis. Early in the sixth century, in the reign of Eastern Roman emperor Justin I, it was named Justinopolis or Ioustinoupolis (Ἰουστινούπολις). The city suffered from an earthquake in 526 and was rebuilt by Justinian I and renamed Justinianopolis or Ioustinianoupolis (Ἰουστινιανούπολις); but the old name persisted, and when Thoros I, king of Lesser Armenia, made it his capital early in the 12th century, it was known as Anazarva.
Its great natural strength and situation, not far from the mouth of the Sis pass, and near the great road which debouched from the Cilician Gates, made Anazarbus play a considerable part in the struggles between the Eastern Roman Empire and the early Muslim invaders. It had been rebuilt by Harun al-Rashid in 796, refortified at great expense by the Hamdanid Sayf al-Dawla (mid-10th century) and again destroyed in 962 by Nikephoros II Phokas. In the 11th century it was again a major fortress, comparable to Tarsos and Marash, and belonged to the realm of Philaretos Brachamios before it was captured around 1084 by the Seljuk Turks. In late 1097 or early 1098 it was captured by the armies of the First Crusade and after the conquest of Antioch it was incorporated into Bohemond of Taranto's Principality of Antioch.
The site briefly exchanged hands between the Byzantine Empire and Armenians, until it was formally part of the Armenian Kingdom of Cilicia. Anazarbus was one of a chain of Armenian fortifications stretching through Cilicia. The castle of Sis (modern Kozan, Adana) lies to the north while Tumlu Castle and Yilankale are to the south, and the fortresses of Amouda and Sarvandikar are to the east. The Mamluk Empire of Egypt finally destroyed the city in 1374.
Remains.
The Crusaders are probably responsible for the construction of an impressive donjon atop the center of the outcrop. Most of the remaining fortifications, including the curtain walls, massive horseshoe-shaped towers, undercrofts, cisterns, and free-standing structures date from the Armenian periods of occupation, which began with the arrival of the Rubenid Baron T‛oros I, . Within the fortress are two Armenian chapels and the magnificent (but severely damaged) three-aisle church built by T‛oros I to celebrate his conquests. The church was once surrounded by a continuous, well-executed dedicatory inscription in Armenian.
The present wall of the lower city is of late construction. It encloses a mass of ruins conspicuous in which are a fine triumphal arch, the colonnades of two streets, a gymnasium, etc. A stadium and a theatre lie outside the walls to the south. The remains of the acropolis fortifications are very interesting, including roads and ditches hewn in the rock. There are no notable structures in the upper town. For picturesqueness the site is not equaled in Cilicia, and it is worthwhile to trace the three fine aqueducts to their sources. A necropolis on the escarpment to the south of the curtain wall can also be seen complete with signs of illegal modern excavations.
A modest Turkish farming village (Dilekkaya) lies to the southwest of the ancient city. A small outdoor museum with some of the artifacts collected in the area can be viewed for a small fee. Also nearby are some beautiful mosaics discovered in a farmers field.
A visit in December 2002 showed that the three aqueducts mentioned above have been nearly completely destroyed. Only small, isolated sections are left standing with the largest portion lying in a pile of rubble that stretches the length of where the aqueducts once stood. A powerful earthquake that struck the area in 1945 is thought to be responsible for the destruction.
In 2013, excavations uncovered the first known colonnaded double-lane road of the ancient world, 34 meters wide and 2700 meters long, also uncovered the ruins of a church and a bathhouse.
In 2017, archaeologists discovered a limestone statue of the goddess Hygieia and the god Eros. The statue is thought to date to the third or fourth century B.C.
Ecclesiastical history.
Anazarbus was the capital and so also from 553 (the date of the Second Council of Constantinople) the metropolitan see of the Late Roman province of Cilicia Secunda.
In the 4th century, one of the bishops of Anazarbus was Athanasius, a "consistent expounder of the theology of Arius." His theological opponent, Athanasius of Alexandria, in "De Synodis" 17, 1 refers to Anazarbus as Ναζαρβῶν.
Maximin of Anazarbus attended the Council of Chalcedon.
A 6th century "Notitia Episcopatuum" indicates that it had as suffragan sees Epiphania, Alexandria Minor, Irenopolis, Flavias, Castabala and Aegeae. Rhosus was also subject to Anazarbus, but after the 6th century was made exempt, and Mopsuestia was raised to the rank of autocephalous metropolitan see, though without suffragans.
Latin Catholic titular see.
The titular archbishopric was revived in the 18th century as a see of the Latin Catholic church, Anazarbus.
It is vacant, having had the following incumbents, generally of the highest (Metropolitan) rank, "with an episcopal (lowest rank) exception:"
Armenian Catholic titular see.
In the 19th century, an Armenian Catholic titular bishopric of Anazarbus (of the Armenians) (Anazarbus degli Armeni in Curiate Italian) was established.
It was a suppressed in 1933, having had a single incumbent, of the intermediary (archiepiscopal) rank :
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Anagram
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An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once. For example, the word "anagram" itself can be rearranged into the phrase "nag a ram"; which is an Easter egg suggestion in Google after searching for the word "anagram".
The original word or phrase is known as the "subject" of the anagram. Any word or phrase that exactly reproduces the letters in another order is an anagram. Someone who creates anagrams may be called an "anagrammatist", and the goal of a serious or skilled anagrammatist is to produce anagrams that reflect or comment on their subject.
Examples.
Anagrams may be created as a commentary on the subject. They may be a parody, a criticism or satire. For example:
An anagram may also be a synonym of the original word or phrase. For example:
An anagram that has a meaning opposed to that of the original word or phrase is called an "antigram". For example:
They can sometimes change from a proper noun or personal name into an appropriate sentence:
They can change part of speech, such as the adjective "silent" to the verb "listen".
"Anagrams" itself can be anagrammatized as "Ars magna" (Latin, 'the great art').
History.
Anagrams can be traced back to the time of the ancient Greeks, and were used to find the hidden and mystical meaning in names.
They were popular throughout Europe during the Middle Ages, for example with the poet and composer Guillaume de Machaut. They are said to date back at least to the Greek poet Lycophron, in the third century BCE; but this relies on an account of Lycophron given by John Tzetzes in the 12th century.
In the Talmudic and Midrashic literature, anagrams were used to interpret the Hebrew Bible, notably by Eleazar of Modi'im. Later, Kabbalists took this up with enthusiasm, calling anagrams "temurah".
Anagrams in Latin were considered witty over many centuries. "Est vir qui adest", explained below, was cited as the example in Samuel Johnson's "A Dictionary of the English Language". They became hugely popular in the early modern period, especially in Germany.
Any historical material on anagrams must always be interpreted in terms of the assumptions and spellings that were current for the language in question. In particular, spelling in English only slowly became fixed. There were attempts to regulate anagram formation, an important one in English being that of George Puttenham's "Of the Anagram or Posy Transposed" in "The Art of English Poesie" (1589).
Influence of Latin.
As a literary game when Latin was the common property of the literate, Latin anagrams were prominent. Two examples are the change of "Ave Maria, gratia plena, Dominus tecum" (Latin: Hail Mary, full of grace, the Lord [is] with you) into "Virgo serena, pia, munda et immaculata" (Latin: Serene virgin, pious, clean and spotless), and the anagrammatic answer to Pilate's question, "Quid est veritas?" (Latin: What is truth?), namely, "Est vir qui adest" (Latin: It is the man who is here). The origins of these are not documented.
Latin continued to influence letter values (such as I = J, U = V and W = VV). There was an ongoing tradition of allowing anagrams to be "perfect" if the letters were all used once, but allowing for these interchanges. This can be seen in a popular Latin anagram against the Jesuits: "Societas Jesu" turned into "Vitiosa seces" (Latin: Cut off the wicked things). Puttenham, in the time of Elizabeth I, wished to start from "Elissabet Anglorum Regina" (Latin: Elizabeth Queen of the English), to obtain "Multa regnabis ense gloria" (Latin: By thy sword shalt thou reign in great renown); he explains carefully that H is "a note of aspiration only and no letter", and that Z in Greek or Hebrew is a mere SS. The rules were not completely fixed in the 17th century. William Camden in his "Remains" commented, singling out some letters—Æ, K, W, and Z—not found in the classical Roman alphabet:
Early modern period.
When it comes to the 17th century and anagrams in English or other languages, there is a great deal of documented evidence of learned interest. The lawyer Thomas Egerton was praised through the anagram "gestat honorem" ('he carries honor'); the physician George Ent took the anagrammatic motto "genio surget" ('he rises through spirit/genius'), which requires his first name as "Georgius". James I's courtiers discovered in "James Stuart" "a just master", and converted "Charles James Stuart" into "Claims Arthur's seat" (even at that point in time, the letters I and J were more-or-less interchangeable). Walter Quin, tutor to the future Charles I, worked hard on multilingual anagrams on the name of father James. A notorious murder scandal, the Overbury case, threw up two imperfect anagrams that were aided by typically loose spelling and were recorded by Simonds D'Ewes: "Francis Howard" (for Frances Carr, Countess of Somerset, her maiden name spelled in a variant) became "Car findes a whore", with the letters E hardly counted, and the victim Thomas Overbury, as "Thomas Overburie", was written as "O! O! a busie murther" (an old form of "murder"), with a V counted as U.
William Drummond of Hawthornden, in an essay "On the Character of a Perfect Anagram", tried to lay down rules for permissible substitutions (such as S standing for Z) and letter omissions. William Camden provided a definition of "Anagrammatisme" as "a dissolution of a name truly written into his letters, as his elements, and a new connection of it by artificial transposition, without addition, subtraction or change of any letter, into different words, making some perfect sense appliable (i.e., applicable) to the person named." Dryden in "MacFlecknoe" disdainfully called the pastime the "torturing of one poor word ten thousand ways".
"Eleanor Audeley", wife of Sir John Davies, is said to have been brought before the High Commission in 1634 for extravagances, stimulated by the discovery that her name could be transposed to "Reveale, O Daniel", and to have been laughed out of court by another anagram submitted by Sir John Lambe, the dean of the Arches, "Dame Eleanor Davies", "Never soe mad a ladie".
An example from France was a flattering anagram for Cardinal Richelieu, comparing him to Hercules or at least one of his hands (Hercules being a kingly symbol), where "Armand de Richelieu" became "Ardue main d'Hercule" ("difficult hand of Hercules").
Modern period.
Examples from the 19th century are the transposition of "Horatio Nelson" into "Honor est a Nilo" (Latin: Honor is from the Nile); and of "Florence Nightingale" into "Flit on, cheering angel". The Victorian love of anagramming as recreation is alluded to by the mathematician Augustus De Morgan using his own name as an example; "Great Gun, do us a sum!" is attributed to his son William De Morgan, but a family friend John Thomas Graves was prolific, and a manuscript with over 2,800 has been preserved.
With the advent of surrealism as a poetic movement, anagrams regained the artistic respect they had had in the Baroque period. The German poet Unica Zürn, who made extensive use of anagram techniques, came to regard obsession with anagrams as a "dangerous fever", because it created isolation of the author. The surrealist leader André Breton coined the anagram "Avida Dollars" for Salvador Dalí, to tarnish his reputation by the implication of commercialism.
Applications.
While anagramming is certainly a recreation first, there are ways in which anagrams are put to use, and these can be more serious, or at least not quite frivolous and formless. For example, psychologists use anagram-oriented tests, often called "anagram solution tasks", to assess the implicit memory of young adults and adults alike.
Establishment of priority.
Natural philosophers (astronomers and others) of the 17th century transposed their discoveries into Latin anagrams, to establish their priority. In this way they laid claim to new discoveries before their results were ready for publication.
Galileo used ' for ' (Latin: I have observed the most distant planet to have a triple form) for discovering the rings of Saturn in 1610. Galileo announced his discovery that Venus had phases like the Moon in the form ' (Latin: These immature ones have already been read in vain by me -oy), that is, when rearranged, ' (Latin: The Mother of Loves [= Venus] imitates the figures of Cynthia [= the moon]). In both cases, Johannes Kepler had solved the anagrams incorrectly, assuming they were talking about the Moons of Mars (') and a red spot on Jupiter ('), respectively. By coincidence, he turned out to be right about the actual objects existing.
In 1656, Christiaan Huygens, using a better telescope than those available to Galileo, figured that Galileo's earlier observations of Saturn actually meant it had a ring (Galileo's tools were only sufficient to see it as bumps) and, like Galileo, had published an anagram, '. Upon confirming his observations, three years later he revealed it to mean ' (Latin: It [Saturn] is surrounded by a thin, flat, ring, nowhere touching, inclined to the ecliptic).
When Robert Hooke discovered Hooke's law in 1660, he first published it in anagram form, ', for ' (Latin: as the extension, so the force).
Pseudonyms.
Anagrams are connected to pseudonyms, by the fact that they may conceal or reveal, or operate somewhere in between like a mask that can establish identity. For example, Jim Morrison used an anagram of his name in the Doors song "L.A. Woman", calling himself "Mr. Mojo Risin'". The use of anagrams and fabricated personal names may be to circumvent restrictions on the use of real names, as happened in the 18th century when Edward Cave wanted to get around restrictions imposed on the reporting of the House of Commons. In a genre such as farce or parody, anagrams as names may be used for pointed and satiric effect.
Pseudonyms adopted by authors are sometimes transposed forms of their names; thus "Calvinus" becomes "Alcuinus" (here V = U) or "François Rabelais" = "Alcofribas Nasier". The name "Voltaire" of François Marie Arouet fits this pattern, and is allowed to be an anagram of "Arouet, l[e] j[eune]" (U = V, J = I) that is, "Arouet the younger". Other examples include:
Several of these are "imperfect anagrams", letters having been left out in some cases for the sake of easy pronunciation.
Titles.
Anagrams used for titles afford scope for some types of wit. Examples:
Coincidences.
In Hebrew, the name "Gernot Zippe" (גרנוט ציפה), the inventor of the Zippe-type centrifuge, is an anagram of the word "centrifuge" (צנטריפוגה).
The sentence "Name is Anu Garg", referring to anagrammer and founder of wordsmith.org Anu Garg, can be rearranged to spell "Anagram genius".
Games and puzzles.
Anagrams are in themselves a recreational activity, but they also make up part of many other games, puzzles and game shows. The Jumble is a puzzle found in many newspapers in the United States requiring the unscrambling of letters to find the solution. Cryptic crossword puzzles frequently use anagrammatic clues, usually indicating that they are anagrams by the inclusion of a descriptive term like "confused" or "in disarray". An example would be "Businessman burst into tears (9 letters)". The solution, "stationer", is an anagram of "into tears", the letters of which have "burst" out of their original arrangement to form the name of a type of "businessman".
Numerous other games and contests involve some element of anagram formation as a basic skill. Some examples:
Ciphers.
Multiple anagramming is a technique used to solve some kinds of cryptograms, such as a permutation cipher, a transposition cipher, and the Jefferson disk. Solutions may be computationally found using a Jumble algorithm.
Methods of construction.
Sometimes, it is possible to "see" anagrams in words, unaided by tools, though the more letters involved the more difficult this becomes. The difficulty is that for a word of different letters, there are (factorial of ) different permutations and so different anagrams of the word. Anagram dictionaries can also be used. Computer programs, known as "anagram search", "anagram servers", and "anagram solvers", among other names, offer a much faster route to creating anagrams, and a large number of these programs are available on the Internet. Some programs use the Anatree algorithm to compute anagrams efficiently.
The program or server carries out an exhaustive search of a database of words, to produce a list containing every possible combination of words or phrases from the input word or phrase using a jumble algorithm. Some programs (such as "Lexpert") restrict to one-word answers. Many anagram servers (for example, The Words Oracle) can control the search results, by excluding or including certain words, limiting the number or length of words in each anagram, or limiting the number of results. Anagram solvers are often banned from online anagram games. The disadvantage of computer anagram solvers, especially when applied to multi-word anagrams, is their poor understanding of the meaning of the words they are manipulating. They usually cannot filter out meaningful or appropriate anagrams from large numbers of nonsensical word combinations. Some servers attempt to improve on this using statistical techniques that try to combine only words that appear together often. This approach provides only limited success since it fails to recognize ironic and humorous combinations.
Some anagrammatists indicate the method they used. Anagrams constructed without the aid of a computer are noted as having been done "manually" or "by hand"; those made by utilizing a computer may be noted "by machine" or "by computer", or may indicate the name of the computer program (using "Anagram Genius").
There are also a few "natural" instances: English words unconsciously created by switching letters around. The French "chaise longue" ("long chair") became the American "chaise lounge" by metathesis (transposition of letters and/or sounds). It has also been speculated that the English "curd" comes from the Latin "crudus" ("raw"). Similarly, the ancient English word for bird was "brid".
Notable anagrammatists.
The French king Louis XIII had a man named Thomas Billon appointed as his Royal Anagrammatist with an annual salary of 1,200 livres. Among contemporary anagrammers, Anu Garg, created an Internet Anagram Server in 1994 together with the satirical anagram-based newspaper "The Anagram Times". Mike Keith has anagrammed the complete text of "Moby Dick". He, along with Richard Brodie, has published "The Anagrammed Bible" that includes anagrammed version of many books of the Bible. Popular television personality Dick Cavett is known for his anagrams of famous celebrities such as Alec Guinness and Spiro Agnew.
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Anadyr (river)
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The Anadyr (; Yukaghir: Онандырь; ) is a river in the far northeast of Siberia which flows into the Gulf of Anadyr of the Bering Sea and drains much of the interior of Chukotka Autonomous Okrug. Its basin corresponds to the Anadyrsky District of Chukotka.
Geography.
The Anadyr is long and has a basin of . It is frozen from October to late May and has a maximum flow in June with the snowmelt. It is navigable in small boats for about to near Markovo. West of Markovo it is in the Anadyr Highlands (moderate mountains and valleys with a few trees) and east of Markovo it moves into the Anadyr Lowlands (very flat treeless tundra with lakes and bogs). The drop from Markovo to the sea is less than .
It rises at about 67°N latitude and 171°E longitude in the Anadyr Highlands, near the headwaters of the Maly Anyuy, flows southwest receiving the waters of the rivers Yablon and Yeropol, turns east around the Shchuchy Range and passes Markvovo and the old site of Anadyrsk, turns north and east and receives the Mayn from the south, thereby encircling the Lebediny Zakaznik, turns northeast to receive the Belaya from the north in the Parapol-Belsky Lowlands, then past Ust-Belaya it turns southeast into the Anadyr Lowlands past the Ust-Tanyurer Zakaznik and receives the Tanyurer from the north. At Lake Krasnoye, it turns east and flows into the Onemen Bay of the Anadyr Estuary. If the Onemen Bay is considered part of the river, it also receives the Velikaya from the south and the Kanchalan from the north. Other important tributaries are the Yablon, Yeropol and Mamolina from the right and the Chineyveyem and Ubiyenka from the left.
Its basin is surrounded by the Amguema and Palyavaam basins to the north, the Bolshoy Anyuy, Oloy and Kolyma basins to the northwest, and the Penzhina basin to the southwest.
History.
In 1648, Semyon Dezhnev reached the mouth of the Anadyr after being shipwrecked on the coast. In 1649, he went upriver and built winter quarters at Anadyrsk. For the next 100 years, the Anadyr was the main route from the Arctic to the Pacific and Kamchatka. In the 18th century, the Anadyr was described by the polar explorer Dmitry Laptev.
Ecology.
The country through which it passes is thinly populated, and is dominated by tundra, with a rich variety of plant life. Much of the region's landscapes are dominated by rugged mountains. For nine months of the year the ground is covered with snow, and the frozen rivers become navigable roads. George Kennan, an American working on the Western Union Telegraph Expedition in the late 1860s, found that dog sled travel on the lower Anadyr was limited by lack of firewood.
Reindeer, upon which the local inhabitants subsisted, were once found in considerable numbers, but the domestic reindeer population has collapsed dramatically since the reorganization and privatization of state-run collective farms beginning in 1992. As herds of domestic reindeer have declined, herds of wild caribou have increased.
There are ten species of salmon inhabiting the Anadyr river basin. Every year, on the last Sunday in April, there is an ice fishing competition in the frozen estuarine waters of the Anadyr's mouth. This festival is locally known as Korfest.
The area is a summering place for a number of migratory birds including brent geese, Eurasian wigeons, and the pintails of California.
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André-Marie Ampère
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André-Marie Ampère (, ; ; 20 January 177510 June 1836) was a French physicist and mathematician who was one of the founders of the science of classical electromagnetism, which he referred to as "electrodynamics". He is also the inventor of numerous applications, such as the solenoid (a term coined by him) and the electrical telegraph. As an autodidact, Ampère was a member of the French Academy of Sciences and professor at the École polytechnique and the Collège de France.
The SI unit of electric current, the ampere (A), is named after him. His name is also one of the 72 names inscribed on the Eiffel Tower. The term "kinematic" is the English version of his "cinématique", which he constructed from the Greek "kinema" ("movement, motion"), itself derived from "kinein" ("to move").
Biography.
Early life.
André-Marie Ampère was born on 20 January 1775 in Lyon to Jean-Jacques Ampère, a prosperous businessman, and Jeanne Antoinette Desutières-Sarcey Ampère, during the height of the French Enlightenment. He spent his childhood and adolescence at the family property at Poleymieux-au-Mont-d'Or near Lyon. Jean-Jacques Ampère, a successful merchant, was an admirer of the philosophy of Jean-Jacques Rousseau, whose theories of education (as outlined in his treatise "Émile") were the basis of Ampère's education. Rousseau believed that young boys should avoid formal schooling and pursue instead a "direct education from nature." Ampère's father actualized this ideal by allowing his son to educate himself within the walls of his well-stocked library. French Enlightenment masterpieces such as Georges-Louis Leclerc, comte de Buffon's "Histoire naturelle, générale et particulière" (begun in 1749) and Denis Diderot and Jean le Rond d'Alembert's "Encyclopédie" (volumes added between 1751 and 1772) thus became Ampère's schoolmasters. The young Ampère, however, soon resumed his Latin lessons, which enabled him to master the works of Leonhard Euler and Daniel Bernoulli.
French Revolution.
In addition, Ampère used his access to the latest books to begin teaching himself advanced mathematics at age 12. In later life Ampère claimed that he knew as much about mathematics and science when he was eighteen as ever he knew, but as a polymath, his reading embraced history, travels, poetry, philosophy, and the natural sciences. His mother was a devout Catholic, so Ampère was also initiated into the Catholic faith along with Enlightenment science. The French Revolution (1789–99) that began during his youth was also influential: Ampère's father was called into public service by the new revolutionary government, becoming a local judge ("juge de paix") in a small town near Lyon. When the Jacobin faction seized control of the Revolutionary government in 1792, his father Jean-Jacques Ampère resisted the new political tides, and he was guillotined on 24 November 1793, as part of the Jacobin purges of the period.
In 1796, Ampère met Julie Carron and, in 1799, they were married. Ampère took his first regular job in 1799 as a mathematics teacher, which gave him the financial security to marry Carron and father his first child, Jean-Jacques (named after his father), the next year. (Jean-Jacques Ampère eventually achieved his own fame as a scholar of languages.) Ampère's maturation corresponded with the transition to the Napoleonic regime in France, and the young father and teacher found new opportunities for success within the technocratic structures favoured by the new French First Consul. In 1802, Ampère was appointed a professor of physics and chemistry at the École Centrale in Bourg-en-Bresse, leaving his ailing wife and infant son in Lyon. He used his time in Bourg to research mathematics, producing "Considérations sur la théorie mathématique du jeu" (1802; "Considerations on the Mathematical Theory of Games"), a treatise on mathematical probability that he sent to the Paris Academy of Sciences in 1803.
Teaching career.
After the death of his wife in July 1803, Ampère moved to Paris, where he began a tutoring post at the new École Polytechnique in 1804. Despite his lack of formal qualifications, Ampère was appointed a professor of mathematics at the school in 1809. As well as holding positions at this school until 1828, in 1819 and 1820 Ampère offered courses in philosophy and astronomy, respectively, at the University of Paris, and in 1824 he was elected to the prestigious chair in experimental physics at the Collège de France. In 1814, Ampère was invited to join the class of mathematicians in the new "Institut Impérial", the umbrella under which the reformed state Academy of Sciences would sit.
Ampère engaged in a diverse array of scientific inquiries during the years leading up to his election to the academy—writing papers and engaging in topics from mathematics and philosophy to chemistry and astronomy, which was customary among the leading scientific intellectuals of the day. Ampère claimed that "at eighteen years he found three culminating points in his life, his First Communion, the reading of Antoine Leonard Thomas's "Eulogy of Descartes", and the Taking of the Bastille. On the day of his wife's death he wrote two verses from the Psalms, and the prayer, 'O Lord, God of Mercy, unite me in Heaven with those whom you have permitted me to love on earth.' In times of duress he would take refuge in the reading of the Bible and the Fathers of the Church."
A lay Catholic, he took for a time into his family the young student Frédéric Ozanam (1813–1853), one of the founders of the Conference of Charity, later known as the Society of Saint Vincent de Paul. Ozanam would much later be beatified by Pope John Paul II in 1998. Through Ampère, Ozanam had contact with leaders of the neo-Catholic movement, such as François-René de Chateaubriand, Jean-Baptiste Henri Lacordaire, and Charles Forbes René de Montalembert.
Work in electromagnetism.
In September 1820, Ampère's friend and eventual eulogist François Arago showed the members of the French Academy of Sciences the surprising discovery by Danish physicist Hans Christian Ørsted that a magnetic needle is deflected by an adjacent electric current. Ampère began developing a mathematical and physical theory to understand the relationship between electricity and magnetism. Furthering Ørsted's experimental work, Ampère showed that two parallel wires carrying electric currents attract or repel each other, depending on whether the currents flow in the same or opposite directions, respectively - this laid the foundation of electrodynamics. He also applied mathematics in generalizing physical laws from these experimental results. The most important of these was the principle that came to be called Ampère's law, which states that the mutual action of two lengths of current-carrying wire is proportional to their lengths and to the intensities of their currents. Ampère also applied this same principle to magnetism, showing the harmony between his law and French physicist Charles Augustin de Coulomb's law of electric action. Ampère's devotion to, and skill with, experimental techniques anchored his science within the emerging fields of experimental physics.
Ampère also provided a physical understanding of the electromagnetic relationship, theorizing the existence of an "electrodynamic molecule" (the forerunner of the idea of the electron) that served as the component element of both electricity and magnetism. Using this physical explanation of electromagnetic motion, Ampère developed a physical account of electromagnetic phenomena that was both empirically demonstrable and mathematically predictive. Almost 100 years later, in 1915, Albert Einstein together with Wander Johannes de Haas made the proof of the correctness of Ampère's hypothesis through the Einstein–de Haas effect. In 1827, Ampère published his magnum opus, "Mémoire sur la théorie mathématique des phénomènes électrodynamiques uniquement déduite de l'experience" (Memoir on the Mathematical Theory of Electrodynamic Phenomena, Uniquely Deduced from Experience), the work that coined the name of his new science, "electrodynamics", and became known ever after as its founding treatise.
In 1827, Ampère was elected a Foreign Member of the Royal Society and in 1828, a foreign member of the Royal Swedish Academy of Science. Probably the highest recognition came from James Clerk Maxwell, who in his "Treatise on Electricity and Magnetism" named Ampère "the Newton of electricity".
Honours.
Legacy.
An international convention, signed at the 1881 International Exposition of Electricity, established the ampere as one of the standard units of electrical measurement, in recognition of his contribution to the creation of modern electrical science and along with the coulomb, volt, ohm, watt and farad, which are named, respectively, after Ampère's contemporaries Charles-Augustin de Coulomb of France, Alessandro Volta of Italy, Georg Ohm of Germany, James Watt of Scotland and Michael Faraday of England. Ampère's name is one of the 72 names inscribed on the Eiffel Tower.
Many streets and squares are named after Ampère, as are schools, a Lyon metro station, a graphics processing unit microarchitecture, a mountain on the moon and an electric ferry in Norway.
Writings.
Partial translations:
Complete translations:
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Ammonia
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Ammonia is an inorganic chemical compound of nitrogen and hydrogen with the formula . A stable binary hydride and the simplest pnictogen hydride, ammonia is a colourless gas with a distinctive pungent smell. It is widely used in fertilizers, refrigerants, explosives, cleaning agents, and is a precursor for numerous chemicals. Biologically, it is a common nitrogenous waste, and it contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to fertilisers. Around 70% of ammonia produced industrially is used to make fertilisers in various forms and composition, such as urea and diammonium phosphate. Ammonia in pure form is also applied directly into the soil.
Ammonia, either directly or indirectly, is also a building block for the synthesis of many chemicals. In many countries, it is classified as an extremely hazardous substance. Ammonia is toxic, causing damage to cells and tissues. For this reason it is excreted by most animals in the urine, in the form of dissolved urea.
Ammonia is produced biologically in a process called nitrogen fixation, but even more is generated industrially by the Haber process. The process helped revolutionize agriculture by providing cheap fertilizers. The global industrial production of ammonia in 2021 was 235 million tonnes. Industrial ammonia is transported by road in tankers, by rail in tank wagons, by sea in gas carriers, or in cylinders. Ammonia occurs in nature and has been detected in the interstellar medium.
Ammonia boils at at a pressure of one atmosphere, but the liquid can often be handled in the laboratory without external cooling. Household ammonia or ammonium hydroxide is a solution of ammonia in water.
Etymology.
The name "ammonia" is derived from the name of the Egyptian deity "Amun" ("Ammon" in Greek) since priests and travelers of those temples would burn soils rich in ammonium chloride, which came from animal dung and urine. Pliny, in Book XXXI of his Natural History, refers to a salt named "hammoniacum", so called because of the proximity of its source to the Temple of Jupiter Amun (Greek Ἄμμων "Ammon") in the Roman province of Cyrenaica. However, the description Pliny gives of the salt does not conform to the properties of ammonium chloride. According to Herbert Hoover's commentary in his English translation of Georgius Agricola's "De re metallica", it is likely to have been common sea salt. In any case, that salt ultimately gave ammonia and ammonium compounds their name.
Natural occurrence (abiological).
Traces of ammonia/ammonium are found in rainwater. Ammonium chloride (sal ammoniac), and ammonium sulfate are found in volcanic districts. Crystals of ammonium bicarbonate have been found in Patagonia guano.
Ammonia is found throughout the Solar System on Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto, among other places: on smaller, icy bodies such as Pluto, ammonia can act as a geologically important antifreeze, as a mixture of water and ammonia can have a melting point as low as if the ammonia concentration is high enough and thus allow such bodies to retain internal oceans and active geology at a far lower temperature than would be possible with water alone. Substances containing ammonia, or those that are similar to it, are called "ammoniacal".
Properties.
Ammonia is a colourless gas with a characteristically pungent smell. It is lighter than air, its density being 0.589 times that of air. It is easily liquefied due to the strong hydrogen bonding between molecules. Gaseous ammonia turns to a colourless liquid, which boils at , and freezes to colourless crystals at . Little data is available at very high temperatures and pressures, but the liquid-vapor critical point occurs at 405 K and 11.35 MPa.
Solid.
The crystal symmetry is cubic, Pearson symbol cP16, space group P213 No.198, lattice constant 0.5125 nm.
Liquid.
Liquid ammonia possesses strong ionising powers reflecting its high "ε" of 22 at . Liquid ammonia has a very high standard enthalpy change of vapourization (23.5 kJ/mol; for comparison, water's is 40.65 kJ/mol, methane 8.19 kJ/mol and phosphine 14.6 kJ/mol) and can be transported in pressurized or refrigerated vessels; however, at standard temperature and pressure liquid anhydrous ammonia will vaporize.
Solvent properties.
Ammonia readily dissolves in water. In an aqueous solution, it can be expelled by boiling. The aqueous solution of ammonia is basic, and may be described as aqueous ammonia or ammonium hydroxide. The maximum concentration of ammonia in water (a saturated solution) has a specific gravity of 0.880 and is often known as '.880 ammonia'.
Liquid ammonia is a widely studied nonaqueous ionising solvent. Its most conspicuous property is its ability to dissolve alkali metals to form highly coloured, electrically conductive solutions containing solvated electrons. Apart from these remarkable solutions, much of the chemistry in liquid ammonia can be classified by analogy with related reactions in aqueous solutions. Comparison of the physical properties of with those of water shows has the lower melting point, boiling point, density, viscosity, dielectric constant and electrical conductivity. These differences are attributed at least in part to the weaker hydrogen bonding in . The ionic self-dissociation constant of liquid at −50 °C is about 10−33.
Liquid ammonia is an ionising solvent, although less so than water, and dissolves a range of ionic compounds, including many nitrates, nitrites, cyanides, thiocyanates, metal cyclopentadienyl complexes and metal bis(trimethylsilyl)amides. Most ammonium salts are soluble and act as acids in liquid ammonia solutions. The solubility of halide salts increases from fluoride to iodide. A saturated solution of ammonium nitrate (Divers' solution, named after Edward Divers) contains 0.83 mol solute per mole of ammonia and has a vapour pressure of less than 1 bar even at . However, few oxyanion salts with other cations dissolve.
Liquid ammonia will dissolve all of the alkali metals and other electropositive metals such as Ca, Sr, Ba, Eu and Yb (also Mg using an electrolytic process). At low concentrations (<0.06 mol/L), deep blue solutions are formed: these contain metal cations and solvated electrons, free electrons that are surrounded by a cage of ammonia molecules.
These solutions are strong reducing agents. At higher concentrations, the solutions are metallic in appearance and in electrical conductivity. At low temperatures, the two types of solution can coexist as phases.
Redox properties of liquid ammonia.
The range of thermodynamic stability of liquid ammonia solutions is very narrow, as the potential for oxidation to dinitrogen, "E"° (), is only +0.04 V. In practice, both oxidation to dinitrogen and reduction to dihydrogen are slow. This is particularly true of reducing solutions: the solutions of the alkali metals mentioned above are stable for several days, slowly decomposing to the metal amide and dihydrogen. Most studies involving liquid ammonia solutions are done in reducing conditions; although oxidation of liquid ammonia is usually slow, there is still a risk of explosion, particularly if transition metal ions are present as possible catalysts.
Structure.
The ammonia molecule has a trigonal pyramidal shape, as predicted by the valence shell electron pair repulsion theory (VSEPR theory) with an experimentally determined bond angle of 106.7°. The central nitrogen atom has five outer electrons with an additional electron from each hydrogen atom. This gives a total of eight electrons, or four electron pairs that are arranged tetrahedrally. Three of these electron pairs are used as bond pairs, which leaves one lone pair of electrons. The lone pair repels more strongly than bond pairs; therefore, the bond angle is not 109.5°, as expected for a regular tetrahedral arrangement, but 106.7°. This shape gives the molecule a dipole moment and makes it polar. The molecule's polarity, and especially its ability to form hydrogen bonds, makes ammonia highly miscible with water. The lone pair makes ammonia a base, a proton acceptor. Ammonia is moderately basic; a 1.0 M aqueous solution has a pH of 11.6, and if a strong acid is added to such a solution until the solution is neutral (), 99.4% of the ammonia molecules are protonated. Temperature and salinity also affect the proportion of ammonium . The latter has the shape of a regular tetrahedron and is isoelectronic with methane.
The ammonia molecule readily undergoes nitrogen inversion at room temperature; a useful analogy is an umbrella turning itself inside out in a strong wind. The energy barrier to this inversion is 24.7 kJ/mol, and the resonance frequency is 23.79 GHz, corresponding to microwave radiation of a wavelength of 1.260 cm. The absorption at this frequency was the first microwave spectrum to be observed and was used in the first maser.
Amphotericity.
One of the most characteristic properties of ammonia is its basicity. Ammonia is considered to be a weak base. It combines with acids to form ammonium salts; thus, with hydrochloric acid it forms ammonium chloride (sal ammoniac); with nitric acid, ammonium nitrate, etc. Perfectly dry ammonia gas will not combine with perfectly dry hydrogen chloride gas; moisture is necessary to bring about the reaction.
As a demonstration experiment under air with ambient moisture, opened bottles of concentrated ammonia and hydrochloric acid solutions produce a cloud of ammonium chloride, which seems to appear 'out of nothing' as the salt aerosol forms where the two diffusing clouds of reagents meet between the two bottles.
The salts produced by the action of ammonia on acids are known as the and all contain the ammonium ion ().
Although ammonia is well known as a weak base, it can also act as an extremely weak acid. It is a protic substance and is capable of formation of amides (which contain the ion). For example, lithium dissolves in liquid ammonia to give a blue solution (solvated electron) of lithium amide:
Self-dissociation.
Like water, liquid ammonia undergoes molecular autoionisation to form its acid and base conjugates:
Ammonia often functions as a weak base, so it has some buffering ability. Shifts in pH will cause more or fewer ammonium cations () and amide anions () to be present in solution. At standard pressure and temperature,
Combustion.
Ammonia does not burn readily or sustain combustion, except under narrow fuel-to-air mixtures of 15–28% ammonia by volume in air. When mixed with oxygen, it burns with a pale yellowish-green flame. Ignition occurs when chlorine is passed into ammonia, forming nitrogen and hydrogen chloride; if chlorine is present in excess, then the highly explosive nitrogen trichloride () is also formed.
The combustion of ammonia to form nitrogen and water is exothermic:
The standard enthalpy change of combustion, Δ"H"°c, expressed per mole of ammonia and with condensation of the water formed, is −382.81 kJ/mol. Dinitrogen is the thermodynamic product of combustion: all nitrogen oxides are unstable with respect to and , which is the principle behind the catalytic converter. Nitrogen oxides can be formed as kinetic products in the presence of appropriate catalysts, a reaction of great industrial importance in the production of nitric acid:
A subsequent reaction leads to :
The combustion of ammonia in air is very difficult in the absence of a catalyst (such as platinum gauze or warm chromium(III) oxide), due to the relatively low heat of combustion, a lower laminar burning velocity, high auto-ignition temperature, high heat of vapourization, and a narrow flammability range. However, recent studies have shown that efficient and stable combustion of ammonia can be achieved using swirl combustors, thereby rekindling research interest in ammonia as a fuel for thermal power production. The flammable range of ammonia in dry air is 15.15–27.35% and in 100% relative humidity air is 15.95–26.55%. For studying the kinetics of ammonia combustion, knowledge of a detailed reliable reaction mechanism is required, but this has been challenging to obtain.
Precursor to organonitrogen compounds.
Ammonia is a direct or indirect precursor to most manufactured nitrogen-containing compounds. It is the precursor to nitric acid, which is the source for most N-substituted aromatic compounds.
Amines can be formed by the reaction of ammonia with alkyl halides or, more commonly, with alcohols:
Its ring-opening reaction with ethylene oxide give ethanolamine, diethanolamine, and triethanolamine.
Amides can be prepared by the reaction of ammonia with carboxylic acid and their derivatives. For example, ammonia reacts with formic acid (HCOOH) to yield formamide () when heated. Acyl chlorides are the most reactive, but the ammonia must be present in at least a twofold excess to neutralise the hydrogen chloride formed. Esters and anhydrides also react with ammonia to form amides. Ammonium salts of carboxylic acids can be dehydrated to amides by heating to 150–200 °C as long as no thermally sensitive groups are present.
Other organonitrogen compounds include alprazolam, ethanolamine, ethyl carbamate and hexamethylenetetramine.
Precursor to inorganic nitrogenous compounds.
Nitric acid is generated via the Ostwald process by oxidation of ammonia with air over a platinum catalyst at , ≈9 atm. Nitric oxide and nitrogen dioxide are intermediate in this conversion:
Nitric acid is used for the production of fertilisers, explosives, and many organonitrogen compounds.
The hydrogen in ammonia is susceptible to replacement by a myriad substituents.
Ammonia gas reacts with metallic sodium to give sodamide, .
With chlorine, monochloramine is formed.
Pentavalent ammonia is known as λ5-amine, nitrogen pentahydride decomposes spontaneously into trivalent ammonia (λ3-amine) and hydrogen gas at normal conditions. This substance was once investigated as a possible solid rocket fuel in 1966.
Ammonia is also used to make the following compounds:
Ammonia is a ligand forming metal ammine complexes. For historical reasons, ammonia is named ammine in the nomenclature of coordination compounds. One notable ammine complex is cisplatin (, a widely used anticancer drug. Ammine complexes of chromium(III) formed the basis of Alfred Werner's revolutionary theory on the structure of coordination compounds. Werner noted only two isomers ("fac"- and "mer"-) of the complex could be formed, and concluded the ligands must be arranged around the metal ion at the vertices of an octahedron.
Ammonia forms 1:1 adducts with a variety of Lewis acids such as , phenol, and . Ammonia is a hard base (HSAB theory) and its E & C parameters are EB = 2.31 and CB = 2.04. Its relative donor strength toward a series of acids, versus other Lewis bases, can be illustrated by C-B plots.
Detection and determination.
Ammonia in solution.
Ammonia and ammonium salts can be readily detected, in very minute traces, by the addition of Nessler's solution, which gives a distinct yellow colouration in the presence of the slightest trace of ammonia or ammonium salts. The amount of ammonia in ammonium salts can be estimated quantitatively by distillation of the salts with sodium (NaOH) or potassium hydroxide (KOH), the ammonia evolved being absorbed in a known volume of standard sulfuric acid and the excess of acid then determined volumetrically; or the ammonia may be absorbed in hydrochloric acid and the ammonium chloride so formed precipitated as ammonium hexachloroplatinate, .
Gaseous ammonia.
Sulfur sticks are burnt to detect small leaks in industrial ammonia refrigeration systems. Larger quantities can be detected by warming the salts with a caustic alkali or with quicklime, when the characteristic smell of ammonia will be at once apparent. Ammonia is an irritant and irritation increases with concentration; the permissible exposure limit is 25 ppm, and lethal above 500 ppm by volume. Higher concentrations are hardly detected by conventional detectors, the type of detector is chosen according to the sensitivity required (e.g. semiconductor, catalytic, electrochemical). Holographic sensors have been proposed for detecting concentrations up to 12.5% in volume.
In a laboratorial setting, gaseous ammonia can be detected by using concentrated hydrochloric acid or gaseous hydrogen chloride. A dense white fume (which is ammonium chloride vapor) arises from the reaction between ammonia and HCl(g).
Ammoniacal nitrogen (NH3–N).
Ammoniacal nitrogen (NH3–N) is a measure commonly used for testing the quantity of ammonium ions, derived naturally from ammonia, and returned to ammonia via organic processes, in water or waste liquids. It is a measure used mainly for quantifying values in waste treatment and water purification systems, as well as a measure of the health of natural and man-made water reserves. It is measured in units of mg/L (milligram per litre).
History.
The ancient Greek historian Herodotus mentioned that there were outcrops of salt in an area of Libya that was inhabited by a people called the 'Ammonians' (now the Siwa oasis in northwestern Egypt, where salt lakes still exist). The Greek geographer Strabo also mentioned the salt from this region. However, the ancient authors Dioscorides, Apicius, Arrian, Synesius, and Aëtius of Amida described this salt as forming clear crystals that could be used for cooking and that were essentially rock salt. "Hammoniacus sal" appears in the writings of Pliny, although it is not known whether the term is equivalent to the more modern sal ammoniac (ammonium chloride).
The fermentation of urine by bacteria produces a solution of ammonia; hence fermented urine was used in Classical Antiquity to wash cloth and clothing, to remove hair from hides in preparation for tanning, to serve as a mordant in dyeing cloth, and to remove rust from iron. It was also used by ancient dentists to wash teeth.
In the form of sal ammoniac (نشادر, "nushadir"), ammonia was important to the Muslim alchemists. It was mentioned in the "Book of Stones", likely written in the 9th century and attributed to Jābir ibn Hayyān. It was also important to the European alchemists of the 13th century, being mentioned by Albertus Magnus. It was also used by dyers in the Middle Ages in the form of fermented urine to alter the colour of vegetable dyes. In the 15th century, Basilius Valentinus showed that ammonia could be obtained by the action of alkalis on sal ammoniac. At a later period, when sal ammoniac was obtained by distilling the hooves and horns of oxen and neutralizing the resulting carbonate with hydrochloric acid, the name 'spirit of hartshorn' was applied to ammonia.
Gaseous ammonia was first isolated by Joseph Black in 1756 by reacting "sal ammoniac" (ammonium chloride) with "calcined magnesia" (magnesium oxide). It was isolated again by Peter Woulfe in 1767, by Carl Wilhelm Scheele in 1770 and by Joseph Priestley in 1773 and was termed by him 'alkaline air'. Eleven years later in 1785, Claude Louis Berthollet ascertained its composition.
The production of ammonia from nitrogen in the air (and hydrogen) was invented by Fritz Haber and Robert LeRossignol. The patent was sent in 1909 (USPTO Nr 1,202,995) and awarded in 1916. Later, Carl Bosch developed the industrial method for ammonia production (Haber–Bosch process). It was first used on an industrial scale in Germany during World War I, following the allied blockade that cut off the supply of nitrates from Chile. The ammonia was used to produce explosives to sustain war efforts. The Nobel Prize in Chemistry 1918 was awarded to Fritz Haber "for the synthesis of ammonia from its elements".
Before the availability of natural gas, hydrogen as a precursor to ammonia production was produced via the electrolysis of water or using the chloralkali process.
With the advent of the steel industry in the 20th century, ammonia became a byproduct of the production of coking coal.
Applications.
Fertiliser.
In the US , approximately 88% of ammonia was used as fertilisers either as its salts, solutions or anhydrously. When applied to soil, it helps provide increased yields of crops such as maize and wheat. 30% of agricultural nitrogen applied in the US is in the form of anhydrous ammonia, and worldwide, 110 million tonnes are applied each year.
Solutions of ammonia ranging from 16% to 25% are used in the fermentation industry as a source of nitrogen for microorganisms and to adjust pH during fermentation.
Refrigeration–R717.
Because of ammonia's vapourization properties, it is a useful refrigerant. It was commonly used before the popularisation of chlorofluorocarbons (Freons). Anhydrous ammonia is widely used in industrial refrigeration applications and hockey rinks because of its high energy efficiency and low cost. It suffers from the disadvantage of toxicity, and requiring corrosion resistant components, which restricts its domestic and small-scale use. Along with its use in modern vapour-compression refrigeration it is used in a mixture along with hydrogen and water in absorption refrigerators. The Kalina cycle, which is of growing importance to geothermal power plants, depends on the wide boiling range of the ammonia–water mixture.
Ammonia coolant is also used in the radiators aboard the International Space Station in loops that are used to regulate the internal temperature and enable temperature-dependent experiments. The ammonia is under sufficient pressure to remain liquid throughout the process. Single-phase ammonia cooling systems also serve the power electronics in each pair of solar arrays.
The potential importance of ammonia as a refrigerant has increased with the discovery that vented CFCs and HFCs are potent and stable greenhouse gases.
Antimicrobial agent for food products.
As early as in 1895, it was known that ammonia was 'strongly antiseptic; it requires 1.4 grams per litre to preserve beef tea (broth).' In one study, anhydrous ammonia destroyed 99.999% of zoonotic bacteria in three types of animal feed, but not silage. Anhydrous ammonia is currently used commercially to reduce or eliminate microbial contamination of beef.
Lean finely textured beef (popularly known as 'pink slime') in the beef industry is made from fatty beef trimmings (c. 50–70% fat) by removing the fat using heat and centrifugation, then treating it with ammonia to kill "E. coli". The process was deemed effective and safe by the US Department of Agriculture based on a study that found that the treatment reduces "E. coli" to undetectable levels. There have been safety concerns about the process as well as consumer complaints about the taste and smell of ammonia-treated beef.
Fuel.
Ammonia has been used as fuel, and is a proposed alternative to fossil fuels and hydrogen, especially in maritime transport. Being liquid at ambient temperature under its own vapour pressure and having high volumetric and gravimetric energy density, ammonia is considered a suitable carrier for hydrogen, and may be cheaper than direct transport of liquid hydrogen.
Compared to hydrogen, ammonia is easier to store. Compared to hydrogen as a fuel, ammonia is much more energy efficient, and could be produced, stored and delivered at a much lower cost than hydrogen, which must be kept compressed or as a cryogenic liquid. The raw energy density of liquid ammonia is 11.5 MJ/L, which is about a third that of diesel. Ammonia can also be converted back to hydrogen to be used to power hydrogen fuel cells, or it may be used directly within high-temperature solid oxide direct ammonia fuel cells to provide efficient power sources that do not emit greenhouse gases. Ammonia to hydrogen conversion can be achieved through the sodium amide process or the catalytic decomposition of ammonia using solid catalysts.
Ammonia production currently creates 1.8% of global emissions. 'Green ammonia' is ammonia produced by using green hydrogen (hydrogen produced by electrolysis with electricity from renewable energy), whereas 'blue ammonia' is ammonia produced using blue hydrogen (hydrogen produced by steam methane reforming) where the carbon dioxide has been captured and stored. In a world first in 2020, Saudi Arabia shipped 40 metric tons of liquid 'blue ammonia' to Japan for use as a fuel. It was produced as a by-product by petrochemical industries, and can be burned without giving off greenhouse gases. Its energy density by volume is nearly double that of liquid hydrogen. If the process of creating it can be scaled up via purely renewable resources, producing green ammonia, it could make a major difference in avoiding climate change.
Ships and maritime transport.
Green ammonia is considered as a potential fuel for new ships, including future container ships. Ammonia is expected to increase in usage as a fuel source for shipping The IEA forecasts that ammonia will meet approximately 45% of shipping fuel demands by 2050.
In 2020, the companies DSME and MAN Energy Solutions announced the construction of an ammonia-based ship, DSME plans to commercialize it by 2025. The use of ammonia as a potential alternative fuel for aircraft jet engines is also being explored. Japan is implementing a plan to develop ammonia co-firing technology that can increase the use of ammonia in power generation, as part of efforts to assist domestic and other Asian utilities to accelerate their transition to carbon neutrality. In October 2021, the first International Conference on Fuel Ammonia (ICFA2021) was held.
In June 2022, IHI Corporation succeeded in reducing greenhouse gases by over 99% during combustion of liquid ammonia in a 2,000-kilowatt-class gas turbine achieving truly -free power generation.
In July 2022, Quad nations of Japan, the U.S., Australia and India agreed to promote technological development for clean-burning hydrogen and ammonia as fuels at the security grouping's first energy meeting. , however, significant amounts of are produced. Nitrous oxide may also be a problem as it is a "greenhouse gas that is known to possess up to 300 times the Global Warming Potential (GWP) of carbon dioxide".
Vehicles, aviation and space.
Ammonia engines or ammonia motors, using ammonia as a working fluid, have been proposed and occasionally used. The principle is similar to that used in a fireless locomotive, but with ammonia as the working fluid, instead of steam or compressed air. Ammonia engines were used experimentally in the 19th century by Goldsworthy Gurney in the UK and the St. Charles Streetcar Line in New Orleans in the 1870s and 1880s, and during World War II ammonia was used to power buses in Belgium.
Ammonia is sometimes proposed as a practical alternative to fossil fuel for internal combustion engines. However, ammonia cannot be easily used in existing Otto cycle engines because of its very narrow flammability range. Despite this, several tests have been run. Its high octane rating of 120 and low flame temperature allows the use of high compression ratios without a penalty of high production. Since ammonia contains no carbon, its combustion cannot produce carbon dioxide, carbon monoxide, hydrocarbons, or soot. At high temperature and in the presence of a suitable catalyst ammonia decomposes into its constituent elements. Decomposition of ammonia is a slightly endothermic process requiring 23 kJ/mol (5.5 kcal/mol) of ammonia, and yields hydrogen and nitrogen gas.
Rocket engines have also been fueled by ammonia. The Reaction Motors XLR99 rocket engine that powered the hypersonic research aircraft used liquid ammonia. Although not as powerful as other fuels, it left no soot in the reusable rocket engine, and its density approximately matches the density of the oxidiser, liquid oxygen, which simplified the aircraft's design.
Power stations.
The company ACWA Power and the city of Neom have announced the construction of a green hydrogen and ammonia plant in 2020.
Other.
Remediation of gaseous emissions.
Ammonia is used to scrub from the burning of fossil fuels, and the resulting product is converted to ammonium sulfate for use as fertiliser. Ammonia neutralises the nitrogen oxide () pollutants emitted by diesel engines. This technology, called SCR (selective catalytic reduction), relies on a vanadia-based catalyst.
Ammonia may be used to mitigate gaseous spills of phosgene.
Stimulant.
Ammonia, as the vapour released by smelling salts, has found significant use as a respiratory stimulant. Ammonia is commonly used in the illegal manufacture of methamphetamine through a Birch reduction. The Birch method of making methamphetamine is dangerous because the alkali metal and liquid ammonia are both extremely reactive, and the temperature of liquid ammonia makes it susceptible to explosive boiling when reactants are added.
Textile.
Liquid ammonia is used for treatment of cotton materials, giving properties like mercerisation, using alkalis. In particular, it is used for prewashing of wool.
Lifting gas.
At standard temperature and pressure, ammonia is less dense than atmosphere and has approximately 45–48% of the lifting power of hydrogen or helium. Ammonia has sometimes been used to fill balloons as a lifting gas. Because of its relatively high boiling point (compared to helium and hydrogen), ammonia could potentially be refrigerated and liquefied aboard an airship to reduce lift and add ballast (and returned to a gas to add lift and reduce ballast).
Fuming.
Ammonia has been used to darken quartersawn white oak in Arts & Crafts and Mission-style furniture. Ammonia fumes react with the natural tannins in the wood and cause it to change colour.
Safety.
The US Occupational Safety and Health Administration (OSHA) has set a 15-minute exposure limit for gaseous ammonia of 35 ppm by volume in the environmental air and an 8-hour exposure limit of 25 ppm by volume. The National Institute for Occupational Safety and Health (NIOSH) recently reduced the IDLH (Immediately Dangerous to Life or Health, the level to which a healthy worker can be exposed for 30 minutes without suffering irreversible health effects) from 500 to 300 ppm based on recent more conservative interpretations of original research in 1943. Other organisations have varying exposure levels. US Navy Standards [U.S. Bureau of Ships 1962] maximum allowable concentrations (MACs): for continuous exposure (60 days) is 25 ppm; for exposure of 1 hour is 400 ppm.
Ammonia vapour has a sharp, irritating, pungent odor that acts as a warning of potentially dangerous exposure. The average odor threshold is 5 ppm, well below any danger or damage. Exposure to very high concentrations of gaseous ammonia can result in lung damage and death. Ammonia is regulated in the US as a non-flammable gas, but it meets the definition of a material that is toxic by inhalation and requires a hazardous safety permit when transported in quantities greater than .
Liquid ammonia is dangerous because it is hygroscopic and because it can cause caustic burns. See for more information.
Toxicity.
The toxicity of ammonia solutions does not usually cause problems for humans and other mammals, as a specific mechanism exists to prevent its build-up in the bloodstream. Ammonia is converted to carbamoyl phosphate by the enzyme carbamoyl phosphate synthetase, and then enters the urea cycle to be either incorporated into amino acids or excreted in the urine. Fish and amphibians lack this mechanism, as they can usually eliminate ammonia from their bodies by direct excretion. Ammonia even at dilute concentrations is highly toxic to aquatic animals, and for this reason it is classified as "dangerous for the environment". Atmospheric ammonia plays a key role in the formation of fine particulate matter.
Ammonia is a constituent of tobacco smoke.
Coking wastewater.
Ammonia is present in coking wastewater streams, as a liquid by-product of the production of coke from coal. In some cases, the ammonia is discharged to the marine environment where it acts as a pollutant. The Whyalla Steelworks in South Australia is one example of a coke-producing facility that discharges ammonia into marine waters.
Aquaculture.
Ammonia toxicity is believed to be a cause of otherwise unexplained losses in fish hatcheries. Excess ammonia may accumulate and cause alteration of metabolism or increases in the body pH of the exposed organism. Tolerance varies among fish species. At lower concentrations, around 0.05 mg/L, un-ionised ammonia is harmful to fish species and can result in poor growth and feed conversion rates, reduced fecundity and fertility and increase stress and susceptibility to bacterial infections and diseases. Exposed to excess ammonia, fish may suffer loss of equilibrium, hyper-excitability, increased respiratory activity and oxygen uptake and increased heart rate. At concentrations exceeding 2.0 mg/L, ammonia causes gill and tissue damage, extreme lethargy, convulsions, coma, and death. Experiments have shown that the lethal concentration for a variety of fish species ranges from 0.2 to 2.0 mg/L.
During winter, when reduced feeds are administered to aquaculture stock, ammonia levels can be higher. Lower ambient temperatures reduce the rate of algal photosynthesis so less ammonia is removed by any algae present. Within an aquaculture environment, especially at large scale, there is no fast-acting remedy to elevated ammonia levels. Prevention rather than correction is recommended to reduce harm to farmed fish and in open water systems, the surrounding environment.
Storage information.
Similar to propane, anhydrous ammonia boils below room temperature when at atmospheric pressure. A storage vessel capable of is suitable to contain the liquid. Ammonia is used in numerous different industrial applications requiring carbon or stainless steel storage vessels. Ammonia with at least 0.2% by weight water content is not corrosive to carbon steel. carbon steel construction storage tanks with 0.2% by weight or more of water could last more than 50 years in service. Experts warn that ammonium compounds not be allowed to come in contact with bases (unless in an intended and contained reaction), as dangerous quantities of ammonia gas could be released.
Laboratory.
The hazards of ammonia solutions depend on the concentration: 'dilute' ammonia solutions are usually 5–10% by weight (< 5.62 mol/L); 'concentrated' solutions are usually prepared at >25% by weight. A 25% (by weight) solution has a density of 0.907 g/cm3, and a solution that has a lower density will be more concentrated. The European Union classification of ammonia solutions is given in the table.
The ammonia vapour from concentrated ammonia solutions is severely irritating to the eyes and the respiratory tract, and experts warn that these solutions only be handled in a fume hood. Saturated ('0.880'–see "") solutions can develop a significant pressure inside a closed bottle in warm weather, and experts also warn that the bottle be opened with care. This is not usually a problem for 25% ('0.900') solutions.
Experts warn that ammonia solutions not be mixed with halogens, as toxic and/or explosive products are formed. Experts also warn that prolonged contact of ammonia solutions with silver, mercury or iodide salts can also lead to explosive products: such mixtures are often formed in qualitative inorganic analysis, and that it needs to be lightly acidified but not concentrated (<6% w/v) before disposal once the test is completed.
Laboratory use of anhydrous ammonia (gas or liquid).
Anhydrous ammonia is classified as toxic (T) and dangerous for the environment (N). The gas is flammable (autoignition temperature: 651 °C) and can form explosive mixtures with air (16–25%). The permissible exposure limit (PEL) in the United States is 50 ppm (35 mg/m3), while the IDLH concentration is estimated at 300 ppm. Repeated exposure to ammonia lowers the sensitivity to the smell of the gas: normally the odour is detectable at concentrations of less than 50 ppm, but desensitised individuals may not detect it even at concentrations of 100 ppm. Anhydrous ammonia corrodes copper- and zinc-containing alloys, which makes brass fittings not appropriate for handling the gas. Liquid ammonia can also attack rubber and certain plastics.
Ammonia reacts violently with the halogens. Nitrogen triiodide, a primary high explosive, is formed when ammonia comes in contact with iodine. Ammonia causes the explosive polymerisation of ethylene oxide. It also forms explosive fulminating compounds with compounds of gold, silver, mercury, germanium or tellurium, and with stibine. Violent reactions have also been reported with acetaldehyde, hypochlorite solutions, potassium ferricyanide and peroxides.
Production.
Ammonia has one of the highest rates of production of any inorganic chemical. Production is sometimes expressed in terms of "fixed nitrogen". Global production was estimated as being 160 million tonnes in 2020 (147 tons of fixed nitrogen). China accounted for 26.5% of that, followed by Russia at 11.0%, the United States at 9.5%, and India at 8.3%.
Before the start of World War I, most ammonia was obtained by the dry distillation of nitrogenous vegetable and animal waste products, including camel dung, where it was distilled by the reduction of nitrous acid and nitrites with hydrogen; in addition, it was produced by the distillation of coal, and also by the decomposition of ammonium salts by alkaline hydroxides such as quicklime:
For small scale laboratory synthesis, one can heat urea and calcium hydroxide or sodium hydroxide:
Electrochemical.
The electrochemical synthesis of ammonia involves the reductive formation of lithium nitride, which can be protonated to ammonia, given a proton source. The first use of this chemistry was reported in 1930, where lithium solutions in ethanol were used to produce ammonia at pressures of up to 1000 bar, with ethanol acting as the proton source. Beyond simply mediating proton transfer to the nitrogen reduction reaction, ethanol has been found to play a multifaceted role, influencing electrolyte transformations and contributing to the formation of the solid electrolyte interphase, which enhances overall reaction efficiency.
In 1994, Tsuneto et al. used lithium electrodeposition in tetrahydrofuran to synthesize ammonia at more moderate pressures with reasonable Faradaic efficiency. Subsequent studies have further explored the ethanol–tetrahydrofuran system for electrochemical ammonia synthesis.
In 2020, a solvent-agnostic gas diffusion electrode was shown to improve nitrogen transport to the reactive lithium. production rates of up to and Faradaic efficiencies of up to 47.5 ± 4% at ambient temperature and 1 bar pressure were achieved.
In 2021, it was demonstrated that ethanol could be replaced with a tetraalkyl phosphonium salt. The study observed production rates of at 69 ± 1% Faradaic efficiency experiments under 0.5 bar hydrogen and 19.5 bar nitrogen partial pressure at ambient temperature. Technology based on this electrochemistry is being developed for commercial fertiliser and fuel production.
In 2022, ammonia was produced via the lithium mediated process in a continuous-flow electrolyzer also demonstrating the hydrogen gas as proton source. The study synthesized ammonia at 61 ± 1% Faradaic efficiency at a current density of −6 mA/cm2 at 1 bar and room temperature.
Biochemistry and medicine.
Ammonia is essential for life. For example, it is required for the formation of amino acids and nucleic acids, fundamental building blocks of life. Ammonia is however quite toxic. Nature thus uses carriers for ammonia. Within a cell, glutamate serves this role. In the bloodstream, glutamine is a source of ammonia.
Ethanolamine, required for cell membranes, is the substrate for ethanolamine ammonia-lyase, which produces ammonia:
Ammonia is both a metabolic waste and a metabolic input throughout the biosphere. It is an important source of nitrogen for living systems. Although atmospheric nitrogen abounds (more than 75%), few living creatures are capable of using atmospheric nitrogen in its diatomic form, gas. Therefore, nitrogen fixation is required for the synthesis of amino acids, which are the building blocks of protein. Some plants rely on ammonia and other nitrogenous wastes incorporated into the soil by decaying matter. Others, such as nitrogen-fixing legumes, benefit from symbiotic relationships with rhizobia bacteria that create ammonia from atmospheric nitrogen.
In humans, inhaling ammonia in high concentrations can be fatal. Exposure to ammonia can cause headaches, edema, impaired memory, seizures and coma as it is neurotoxic in nature.
Biosynthesis.
In certain organisms, ammonia is produced from atmospheric nitrogen by enzymes called nitrogenases. The overall process is called nitrogen fixation. Intense effort has been directed toward understanding the mechanism of biological nitrogen fixation. The scientific interest in this problem is motivated by the unusual structure of the active site of the enzyme, which consists of an ensemble.
Ammonia is also a metabolic product of amino acid deamination catalyzed by enzymes such as glutamate dehydrogenase 1. Ammonia excretion is common in aquatic animals. In humans, it is quickly converted to urea (by liver), which is much less toxic, particularly less basic. This urea is a major component of the dry weight of urine. Most reptiles, birds, insects, and snails excrete uric acid solely as nitrogenous waste.
Physiology.
Ammonia plays a role in both normal and abnormal animal physiology. It is biosynthesised through normal amino acid metabolism and is toxic in high concentrations. The liver converts ammonia to urea through a series of reactions known as the urea cycle. Liver dysfunction, such as that seen in cirrhosis, may lead to elevated amounts of ammonia in the blood (hyperammonemia). Likewise, defects in the enzymes responsible for the urea cycle, such as ornithine transcarbamylase, lead to hyperammonemia. Hyperammonemia contributes to the confusion and coma of hepatic encephalopathy, as well as the neurological disease common in people with urea cycle defects and organic acidurias.
Ammonia is important for normal animal acid/base balance. After formation of ammonium from glutamine, α-ketoglutarate may be degraded to produce two bicarbonate ions, which are then available as buffers for dietary acids. Ammonium is excreted in the urine, resulting in net acid loss. Ammonia may itself diffuse across the renal tubules, combine with a hydrogen ion, and thus allow for further acid excretion.
Excretion.
Ammonium ions are a toxic waste product of metabolism in animals. In fish and aquatic invertebrates, it is excreted directly into the water. In mammals, sharks, and amphibians, it is converted in the urea cycle to urea, which is less toxic and can be stored more efficiently. In birds, reptiles, and terrestrial snails, metabolic ammonium is converted into uric acid, which is solid and can therefore be excreted with minimal water loss.
Extraterrestrial occurrence.
Ammonia has been detected in the atmospheres of the giant planets Jupiter, Saturn, Uranus and Neptune, along with other gases such as methane, hydrogen, and helium. The interior of Saturn may include frozen ammonia crystals. It is found on Deimos and Phobos–the two moons of Mars.
Interstellar space.
Ammonia was first detected in interstellar space in 1968, based on microwave emissions from the direction of the galactic core. This was the first polyatomic molecule to be so detected. The sensitivity of the molecule to a broad range of excitations and the ease with which it can be observed in a number of regions has made ammonia one of the most important molecules for studies of molecular clouds. The relative intensity of the ammonia lines can be used to measure the temperature of the emitting medium.
The following isotopic species of ammonia have been detected: , , , and . The detection of triply deuterated ammonia was considered a surprise as deuterium is relatively scarce. It is thought that the low-temperature conditions allow this molecule to survive and accumulate.
Since its interstellar discovery, has proved to be an invaluable spectroscopic tool in the study of the interstellar medium. With a large number of transitions sensitive to a wide range of excitation conditions, has been widely astronomically detected–its detection has been reported in hundreds of journal articles. Listed below is a sample of journal articles that highlights the range of detectors that have been used to identify ammonia.
The study of interstellar ammonia has been important to a number of areas of research in the last few decades. Some of these are delineated below and primarily involve using ammonia as an interstellar thermometer.
Interstellar formation mechanisms.
The interstellar abundance for ammonia has been measured for a variety of environments. The []/[] ratio has been estimated to range from 10−7 in small dark clouds up to 10−5 in the dense core of the Orion molecular cloud complex. Although a total of 18 total production routes have been proposed, the principal formation mechanism for interstellar is the reaction:
The rate constant, "k", of this reaction depends on the temperature of the environment, with a value of formula_1 at 10 K. The rate constant was calculated from the formula . For the primary formation reaction, and . Assuming an abundance of formula_2and an electron abundance of 10−7 typical of molecular clouds, the formation will proceed at a rate of in a molecular cloud of total density .
All other proposed formation reactions have rate constants of between two and 13 orders of magnitude smaller, making their contribution to the abundance of ammonia relatively insignificant. As an example of the minor contribution other formation reactions play, the reaction:
has a rate constant of 2.2. Assuming densities of 105 and []/[] ratio of 10−7, this reaction proceeds at a rate of 2.2, more than three orders of magnitude slower than the primary reaction above.
Some of the other possible formation reactions are:
Interstellar destruction mechanisms.
There are 113 total proposed reactions leading to the destruction of . Of these, 39 were tabulated in extensive tables of the chemistry among C, N and O compounds. A review of interstellar ammonia cites the following reactions as the principal dissociation mechanisms:
with rate constants of 4.39×10−9 and 2.2×10−9, respectively. The above equations (, ) run at a rate of 8.8×10−9 and 4.4×10−13, respectively. These calculations assumed the given rate constants and abundances of []/[] = 10−5, []/[] = 2×10−5, []/[] = 2×10−9, and total densities of "n" = 105, typical of cold, dense, molecular clouds. Clearly, between these two primary reactions, equation () is the dominant destruction reaction, with a rate ≈10,000 times faster than equation (). This is due to the relatively high abundance of .
Single antenna detections.
Radio observations of from the Effelsberg 100-m Radio Telescope reveal that the ammonia line is separated into two components–a background ridge and an unresolved core. The background corresponds well with the locations previously detected CO. The 25 m Chilbolton telescope in England detected radio signatures of ammonia in H II regions, HNH2O masers, H–H objects, and other objects associated with star formation. A comparison of emission line widths indicates that turbulent or systematic velocities do not increase in the central cores of molecular clouds.
Microwave radiation from ammonia was observed in several galactic objects including W3(OH), Orion A, W43, W51, and five sources in the galactic centre. The high detection rate indicates that this is a common molecule in the interstellar medium and that high-density regions are common in the galaxy.
Interferometric studies.
VLA observations of in seven regions with high-velocity gaseous outflows revealed condensations of less than 0.1 pc in L1551, S140, and Cepheus A. Three individual condensations were detected in Cepheus A, one of them with a highly elongated shape. They may play an important role in creating the bipolar outflow in the region.
Extragalactic ammonia was imaged using the VLA in IC 342. The hot gas has temperatures above 70 K, which was inferred from ammonia line ratios and appears to be closely associated with the innermost portions of the nuclear bar seen in CO. was also monitored by VLA toward a sample of four galactic ultracompact HII regions: G9.62+0.19, G10.47+0.03, G29.96−0.02, and G31.41+0.31. Based upon temperature and density diagnostics, it is concluded that in general such clumps are probably the sites of massive star formation in an early evolutionary phase prior to the development of an ultracompact HII region.
Infrared detections.
Absorption at 2.97 micrometres due to solid ammonia was recorded from interstellar grains in the Becklin–Neugebauer Object and probably in NGC 2264-IR as well. This detection helped explain the physical shape of previously poorly understood and related ice absorption lines.
A spectrum of the disk of Jupiter was obtained from the Kuiper Airborne Observatory, covering the 100 to 300 cm−1 spectral range. Analysis of the spectrum provides information on global mean properties of ammonia gas and an ammonia ice haze.
A total of 149 dark cloud positions were surveyed for evidence of 'dense cores' by using the (J,K) = (1,1) rotating inversion line of NH3. In general, the cores are not spherically shaped, with aspect ratios ranging from 1.1 to 4.4. It is also found that cores with stars have broader lines than cores without stars.
Ammonia has been detected in the Draco Nebula and in one or possibly two molecular clouds, which are associated with the high-latitude galactic infrared cirrus. The finding is significant because they may represent the birthplaces for the Population I metallicity B-type stars in the galactic halo that could have been borne in the galactic disk.
Observations of nearby dark clouds.
By balancing and stimulated emission with spontaneous emission, it is possible to construct a relation between excitation temperature and density. Moreover, since the transitional levels of ammonia can be approximated by a 2-level system at low temperatures, this calculation is fairly simple. This premise can be applied to dark clouds, regions suspected of having extremely low temperatures and possible sites for future star formation. Detections of ammonia in dark clouds show very narrow linesindicative not only of low temperatures, but also of a low level of inner-cloud turbulence. Line ratio calculations provide a measurement of cloud temperature that is independent of previous CO observations. The ammonia observations were consistent with CO measurements of rotation temperatures of ≈10 K. With this, densities can be determined, and have been calculated to range between 104 and 105 cm−3 in dark clouds. Mapping of gives typical clouds sizes of 0.1 pc and masses near 1 solar mass. These cold, dense cores are the sites of future star formation.
UC HII regions.
Ultra-compact HII regions are among the best tracers of high-mass star formation. The dense material surrounding UCHII regions is likely primarily molecular. Since a complete study of massive star formation necessarily involves the cloud from which the star formed, ammonia is an invaluable tool in understanding this surrounding molecular material. Since this molecular material can be spatially resolved, it is possible to constrain the heating/ionising sources, temperatures, masses, and sizes of the regions. Doppler-shifted velocity components allow for the separation of distinct regions of molecular gas that can trace outflows and hot cores originating from forming stars.
Extragalactic detection.
Ammonia has been detected in external galaxies, and by simultaneously measuring several lines, it is possible to directly measure the gas temperature in these galaxies. Line ratios imply that gas temperatures are warm (≈50 K), originating from dense clouds with sizes of tens of parsecs. This picture is consistent with the picture within our Milky Way galaxyhot dense molecular cores form around newly forming stars embedded in larger clouds of molecular material on the scale of several hundred parsecs (giant molecular clouds; GMCs).
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Amethyst
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Amethyst is a violet variety of quartz. The name comes from the Koine Greek from - , "not" and (Ancient Greek) / (Modern Greek), "intoxicate", a reference to the belief that the stone protected its owner from drunkenness. Ancient Greeks wore amethyst and carved drinking vessels from it in the belief that it would prevent intoxication.
Amethyst, a semiprecious stone, is often used in jewelry.
It occurs mostly in association with calcite, quartz, smoky quartz, hematite, pyrite, fluorite, goethite, agate and chalcedony.
Structure.
Amethyst is a violet variety of quartz () and owes its violet color to irradiation, impurities of iron () and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions.
The irradiation causes the iron ions that replace Si in the lattice to lose an electron and form a color center.
Amethyst is a three-dimensional network of tetrahedra where the silicon atoms are in the center and are surrounded by four oxygen atoms located at the vertices of a tetrahedron. This structure is quite rigid and results in quartz's hardness and resistance to weathering. The hardness of the mineral is the same as quartz, thus making it suitable for use in jewelry.
Hue and tone.
Amethyst occurs in primary hues from a light lavender or pale violet to a deep purple. Amethyst may exhibit one or both secondary hues, red and blue.
High-quality amethyst can be found in Siberia, Sri Lanka, Brazil, Uruguay, and the Far East. The ideal grade, called "Deep Siberian", has a primary purple hue of around 75–80%, with 15–20% blue and (depending on the light source) red secondary hues.
"Rose de France" is defined by its markedly light shade of the purple, reminiscent of a lavender / lilac shade. These pale colors were once considered undesirable, but have recently become popular due to intensive marketing.
Green quartz is sometimes called "green amethyst"; the scientific name is prasiolite.
Other names for green quartz are "vermarine" and "lime citrine".
Amethyst frequently shows color zoning, with the most intense color typically found at the crystal terminations. One of gem cutters' tasks is to make a finished product with even color. Sometimes, only a thin layer of a natural, uncut amethyst is violet colored, or the color is very uneven. The uncut gem may have only a small portion that is suitable for faceting.
The color of amethyst has been demonstrated to result from substitution by irradiation of trivalent iron (Fe3+) for silicon in the structure, in the presence of trace elements of large ionic radius, and to a certain extent, the amethyst color can naturally result from displacement of transition elements even if the iron concentration is low. Natural amethyst is dichroic in reddish violet and bluish violet, but when heated, turns yellow-orange, yellow-brown, or dark brownish and may resemble citrine, but loses its dichroism, unlike genuine citrine. When partially heated, amethyst can result in ametrine.
Amethyst can fade in tone if overexposed to light sources, and can be artificially darkened with adequate irradiation. It does not fluoresce under either short-wave or long-wave UV light.
Geographic distribution.
Amethyst is found in many locations around the world. Between 2000 and 2010, the greatest production was from Marabá and Pau d'Arco, Pará, and the Paraná Basin, Rio Grande do Sul, Brazil; Sandoval, Santa Cruz, Bolivia; Artigas, Uruguay; Kalomo, Zambia; and Thunder Bay, Ontario. Lesser amounts are found in many other locations in Africa, Brazil, Spain, Argentina, Russia, Afghanistan, South Korea, Mexico, and the United States.
Amethyst is produced in abundance in the state of Rio Grande do Sul in Brazil where it occurs in large geodes within volcanic rocks.
Many of the hollow agates of southwestern Brazil and Uruguay contain a crop of amethyst crystals in the interior. Artigas, Uruguay and neighboring Brazilian state Rio Grande do Sul are large world producers, with lesser quantities mined in Minas Gerais and Bahia states.
Amethyst is also found and mined in South Korea. The large opencast amethyst vein at Maissau, Lower Austria, was historically important, but is no longer included among significant producers. Much fine amethyst comes from Russia, especially near Mursinka in the Ekaterinburg district, where it occurs in drusy cavities in granitic rocks. Amethyst was historically mined in many localities in south India, though these are no longer significant producers. One of the largest global amethyst producers is Zambia in southern Africa, with an annual production around 1000 tons.
Amethyst occurs at many localities in the United States. The most important production is at Four Peaks, Gila and Maricopa Counties, Arizona, and Jackson's Crossroads, Wilkes County, Georgia.
Smaller occurrences have been reported in the Red Feather Lakes, near Fort Collins, Colorado; Amethyst Mountain, Texas; Yellowstone National Park; Delaware County, Pennsylvania; Haywood County, North Carolina; Deer Hill and Stow, Maine, and in the Lake Superior region of Minnesota, Wisconsin, and Michigan.
Amethyst is relatively common in the Canadian provinces of Ontario and Nova Scotia. The largest amethyst mine in North America is located in Thunder Bay, Ontario.
Amethyst is the official state gemstone of South Carolina. Several South Carolina amethysts are on display at the Smithsonian Museum of Natural History.
History.
Amethyst was used as a gemstone by the ancient Egyptians and was largely employed in antiquity for intaglio engraved gems.
The ancient Greeks believed amethyst gems could prevent intoxication,
while medieval European soldiers wore amethyst amulets as protection in battle in the belief that amethysts heal people and keep them cool-headed.
Beads of amethyst were found in Anglo-Saxon graves in England.
Anglican bishops wear an episcopal ring often set with an amethyst, an allusion to the description of the Apostles as "not drunk" at Pentecost in Acts 2:15.
A large geode, or "amethyst-grotto", from near Santa Cruz in southern Brazil was presented at a 1902 exhibition in Düsseldorf, Germany.
Synthetic amethyst.
Synthetic (laboratory-grown) amethyst is produced by a synthesis method called hydrothermal growth, which grows the crystals inside a high-pressure autoclave.
Synthetic amethyst is made to imitate the best quality amethyst. Its chemical and physical properties are the same as those of natural amethyst, and it cannot be differentiated with absolute certainty without advanced gemmological testing (which is often cost-prohibitive). On the other hand, if some inexactness is acceptable, one test based on "Brazil law twinning" (a form of quartz twinning where right- and left-hand quartz structures are combined in a single crystal) can be used to identify most synthetic amethyst rather easily. Synthesizing twinned amethyst is possible, but this type is not available in large quantities in the market.
Treated amethyst is produced by gamma ray, X-ray, or electron-beam irradiation of clear quartz (rock crystal), which has been first doped with ferric impurities. Exposure to heat partially cancels the irradiation effects and amethyst generally becomes yellow or even green. Much of the citrine, cairngorm, or yellow quartz of jewelry is said to be merely "burnt amethyst".
Cultural history.
Ancient Greece.
The Greek word may be translated as "not drunken", from Greek , "not" + , "intoxicated". Amethyst was considered to be a strong antidote against drunkenness.
In his poem "L'Amethyste, ou les Amours de Bacchus et d'Amethyste" (Amethyst or the loves of Bacchus and Amethyste), the French poet Rémy Belleau (1528–1577) invented a myth in which Bacchus, the god of intoxication, of wine, and grapes was pursuing a maiden named Amethyste, who refused his affections. Amethyste prayed to the gods to remain chaste, a prayer which the chaste goddess Diana answered, transforming her into a white stone. Humbled by Amethyste's desire to remain chaste, Bacchus poured wine over the stone as an offering, dyeing the crystals purple.
Variations of the story include that Dionysus had been insulted by a mortal and swore to slay the next mortal who crossed his path, creating fierce tigers to carry out his wrath. The mortal turned out to be a beautiful young woman, Amethystos, who was on her way to pay tribute to Artemis. Her life was spared by Artemis, who transformed the maiden into a statue of pure crystalline quartz to protect her from the brutal claws. Dionysus wept tears of wine in remorse for his action at the sight of the beautiful statue. The god's tears then stained the quartz purple.
This myth and its variations are not found in classical sources. However, the goddess Rhea does present Dionysus with an amethyst stone to preserve the wine-drinker's sanity in historical text.
Other cultural associations.
Tibetans consider amethyst sacred to the Buddha and make prayer beads from it. Amethyst is considered the birthstone of February.
In the Middle Ages, it was considered a symbol of royalty and used to decorate English regalia. In the Old World, amethyst was considered one of the cardinal gems, in that it was one of the five gemstones considered precious above all others, until large deposits were found in Brazil.
Value.
Until the 18th century, amethyst was included in the cardinal, or most valuable, gemstones (along with diamond, sapphire, ruby, and emerald), but since the discovery of extensive deposits in locations such as Brazil, it has lost most of its value. It is now considered a semiprecious stone.
Collectors look for depth of color, possibly with red flashes if cut conventionally.
As amethyst is readily available in large structures, the value of the gem is not primarily defined by carat weight. This is different from most gemstones, since the carat weight typically exponentially increases the value of the stone. The biggest factor in the value of amethyst is the color displayed.
The highest-grade amethyst (called "deep Russian") is exceptionally rare. When one is found, its value is dependent on the demand of collectors; however, the highest-grade sapphires or rubies are still orders of magnitude more expensive than amethyst.
Handling and care.
The most suitable setting for gem amethyst is a prong or a bezel setting. The channel method must be used with caution.
Amethyst has a good hardness, and handling it with proper care will prevent any damage to the stone. Amethyst is sensitive to strong heat and may lose or change its colour when exposed to prolonged heat or light. Polishing the stone or cleaning it by ultrasonic or steamer must be done with caution.
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Albertosaurus
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Albertosaurus (; meaning "Alberta lizard") is a genus of large tyrannosaurid theropod dinosaur that lived in northwestern North America during the early to middle Maastrichtian age of the Late Cretaceous period, about 71 million years ago. The type species, "A. sarcophagus", was apparently restricted in range to the modern-day Canadian province of Alberta, after which the genus is named, although an indeterminate species ("cf. "Albertosaurus" sp.") has been discovered in the Corral de Enmedio and Packard Formations of Mexico. Scientists disagree on the content of the genus and some recognize "Gorgosaurus libratus" as a second species.
As a tyrannosaurid, "Albertosaurus" was a bipedal predator with short arms, two-fingered hands, and a massive head with dozens of large, sharp teeth, a strong sense of smell, powerful binocular vision, and a bone crushing bite force. It may have even been the apex predator in its local ecosystem. While "Albertosaurus" was certainly large for a theropod, it was still much smaller than its larger and more famous relative "Tyrannosaurus rex", growing up to in length and weighing .
Since the first discovery in 1884, fossils of more than 30 individuals have been recovered that provide scientists with a more detailed knowledge of "Albertosaurus" anatomy than what is available for most other tyrannosaurids. The discovery of 26 individuals in one particular site provides evidence of gregarious behavior and allows for studies of ontogeny and population biology. These are near impossible with lesser-known dinosaurs because their remains are rarer and more fragmentary when compared to those of "Albertosaurus".
History of discovery.
Naming.
"Albertosaurus" was named by Henry Fairfield Osborn in a one-page note at the end of his 1905 description of "Tyrannosaurus rex". Its namesake is Alberta, the Canadian province established the very same year where the first remains were found. The generic name also incorporates the Greek word /"sauros", meaning "lizard", which is the most common suffix in dinosaur names. The type species is "Albertosaurus sarcophagus" and the specific name is derived from the Ancient Greek term σαρκοφάγος ('), meaning "flesh-eating", and having the same etymology as the funeral container with which it shares its name, which is a combination of the Greek words σαρξ/' ("flesh") and /"" ("to eat"). More than 30 specimens of all ages are known to science.
Early discoveries.
The type specimen is a partial skull collected on June 9, 1884, from an outcrop of the Horseshoe Canyon Formation alongside the Red Deer River in Alberta. It was recovered by an expedition of the Geological Survey of Canada, led by the famous geologist Joseph Burr Tyrrell. Due to a lack of specialised equipment, the almost complete skull could only be partially secured. In 1889, Tyrrell's colleague Thomas Chesmer Weston found an incomplete smaller skull associated with some skeletal material at a location nearby. The two skulls were assigned to the preexisting species "Laelaps incrassatus" by Edward Drinker Cope in 1892. Although the name "Laelaps" was preoccupied by a genus of mite and had been changed to "Dryptosaurus" in 1877 by Othniel Charles Marsh, Cope stubbornly refused to recognize the new name created by his archrival. However, Lawrence Lambe used the name "Dryptosaurus incrassatus" instead of "Laelaps incrassatus" when he described the remains in detail in 1903 and 1904, which was a combination first coined by Oliver Perry Hay in 1902.
Shortly later, Osborn pointed out that "D. incrassatus" was based on generic tyrannosaurid teeth, so the two Horseshoe Canyon skulls could not be confidently referred to that species. The Horseshoe Canyon skulls also differed markedly from the remains of "D. aquilunguis", type species of "Dryptosaurus", so Osborn gave them the new name "Albertosaurus sarcophagus" in 1905. He did not describe the remains in any great detail, citing Lambe's complete description the year before. Both specimens, the holotype CMN 5600 and the paratype CMN 5601, are stored in the Canadian Museum of Nature in Ottawa. By the early twenty-first century, some concerns had arisen that, due to the damaged state of the holotype, "Albertosaurus" might be a "nomen dubium" that could only be used for the type specimen itself because other fossils could not reliably be assigned to it. However, in 2010, Thomas Carr established that the holotype, the paratype, and comparable later finds all shared a single common unique trait, or autapomorphy. The possession of an enlarged pneumatic opening in the back rim of the side of the palatine bone proves that "Albertosaurus" is a valid taxon.
Dry Island bone bed.
On August 11, 1910, American paleontologist Barnum Brown discovered the remains of a large group of "Albertosaurus" at another quarry alongside the Red Deer River. Because of the large number of bones and the limited time available, Brown's party did not collect every specimen, but made sure to collect remains from all of the individuals that they could identify in the bone bed. Among the bones deposited in the American Museum of Natural History collections in New York City are seven sets of right metatarsals, along with two isolated toe bones that did not match any of the metatarsals in size. This indicated the presence of at least nine individuals in the quarry. Palaeontologist Philip J. Currie of the Royal Tyrrell Museum of Palaeontology rediscovered the bonebed in 1997 and resumed fieldwork at the site, which is now located inside Dry Island Buffalo Jump Provincial Park. Further excavation from 1997 to 2005 turned up the remains of 13 more individuals of various ages, including a diminutive two-year-old and a very old individual estimated at over long. None of these individuals are known from complete skeletons and most are represented by remains in both museums. Excavations continued until 2008, when the minimum number of individuals present had been established at 12 (on the basis of preserved elements that occur only once in a skeleton) and at 26 if mirrored elements were counted when differing in size due to ontogeny. A total of 1,128 "Albertosaurus" bones had been secured, which is the largest concentration of large theropod fossils known from the Cretaceous.
Other discoveries.
In 1911, Barnum Brown, during the second year of the American Museum of Natural History's operations in Alberta, uncovered a fragmentary partial "Albertosaurus" skull at the Red Deer River near Tolman Bridge (specimen AMNH 5222).
William Parks described a new species in 1928, "Albertosaurus arctunguis", based on a partial skeleton lacking a skull that was excavated by Gus Lindblad and Ralph Hornell near the Red Deer River in 1923, but this species has been considered identical to "A. sarcophagus" since 1970. Parks' specimen (ROM 807) is housed in the Royal Ontario Museum in Toronto.
No "Albertosaurus" fossils were found from 1926 to 1972, but there has been an increase in findings since then. Apart from the Dry Island bonebed, six more skulls and skeletons have since been discovered in Alberta and are housed in various Canadian museums. Specimen RTMP 81.010.001 was found in 1978 by amateur paleontologist Maurice Stefanuk. RTMP 85.098.001 was found by Stefanuk on June 16, 1985. RTMP 86.64.001 was found in December 1985. RTMP 86.205.001 was found in 1986. RTMP 97.058.0001 was found in 1996 and then there is CMN 11315. Unfortunately, none of these skeletons were found with complete skulls. Fossils have also been reported from the American states of Montana, New Mexico, Wyoming, and Missouri, but they are doubted to be from "A. sarcophagus" and may not even belong to the genus "Albertosaurus".
Two specimens from "cf "Albertosaurus" ".sp" have been found in Mexico (Packard Formation and Corral de Enmedio Formation).
"Gorgosaurus libratus".
In 1913, paleontologist Charles H. Sternberg recovered another tyrannosaurid skeleton from the slightly older Dinosaur Park Formation in Alberta. Lawrence Lambe named this dinosaur "Gorgosaurus libratus" in 1914. Other specimens were later found in Alberta and the US state of Montana. Finding no significant differences to separate the two taxa (due mostly to a lack of good "Albertosaurus" skull material), Dale Russell declared the name "Gorgosaurus" a junior synonym of "Albertosaurus", which had been named first, and "G. libratus" was renamed "Albertosaurus libratus" in 1970. A species distinction was maintained because of the age difference. The addition extended the temporal range of the genus "Albertosaurus" earlier by several million years and its geographic range southwards by hundreds of kilometres.
In 2003, Philip J. Currie, benefiting from much more extensive finds and a general increase in anatomical knowledge of theropods, compared several tyrannosaurid skulls and came to the conclusion that the two species are more distinct than previously thought. As the two species are sister taxa, they are more closely related to each other than to any other species of tyrannosaurid. Recognizing this, Currie nevertheless recommended that "Albertosaurus" and "Gorgosaurus" be kept as separate genera, as he concluded that they were no more similar than "Daspletosaurus" and "Tyrannosaurus", which are almost always separated. In addition to this, several albertosaurine specimens have been recovered from Alaska and New Mexico. Currie suggested that the "Albertosaurus"-"Gorgosaurus" situation may be clarified once these are fully described. Most authors have followed Currie's recommendation, but some have not.
Other species.
In 1930, Anatoly Nikolaevich Riabinin named "Albertosaurus pericolosus" based on a tooth from China that probably belonged to "Tarbosaurus". In 1932, Friedrich von Huene renamed "Dryptosaurus incrassatus", not considered a "nomen dubium" by him, to "Albertosaurus incrassatus". Because he had identified "Gorgosaurus" with "Albertosaurus", in 1970, Russell also renamed "Gorgosaurus sternbergi" (Matthew & Brown 1922) into "Albertosaurus sternbergi" and "Gorgosaurus lancensis" (Gilmore 1946) into "Albertosaurus lancensis". The former species is today seen as a juvenile form of "Gorgosaurus libratus" and the latter is seen as either identical to "Tyrannosaurus" or representing a separate genus, "Nanotyrannus". In 1988, Gregory S. Paul based "Albertosaurus megagracilis" on a small tyrannosaurid skeleton, specimen LACM 28345, from the Hell Creek Formation of Montana. It was renamed "Dinotyrannus" in 1995, but is now thought to represent a juvenile "Tyrannosaurus rex". Also in 1988, Paul renamed "Alectrosaurus olseni" (Gilmore 1933) into "Albertosaurus olseni", but this has found no general acceptance. In 1989, "Gorgosaurus novojilovi" (Maleev 1955) was renamed by Bryn Mader and Robert Bradley as "Albertosaurus novojilovi".
On two occasions, species based on valid "Albertosaurus" material were reassigned to a different genus, "Deinodon". In 1922, William Diller Matthew renamed "A. sarcophagus" into "Deinodon sarcophagus". In 1939, German paleontologist Oskar Kuhn renamed "A. arctunguis" into "Deinodon arctunguis".
Description.
"Albertosaurus" was a fairly large bipedal predator, but smaller than "Tarbosaurus" and "Tyrannosaurus rex". Typical "Albertosaurus" adults measured up to long and weighed between in body mass.
"Albertosaurus" shared a similar body appearance with all other tyrannosaurids, "Gorgosaurus" in particular. Typical for a theropod, "Albertosaurus" was bipedal and balanced its large, heavy head and torso with a long, muscular tail. However, tyrannosaurid forelimbs were extremely small for their body size and retained only two functional fingers, the second being longer than the first. The legs were long and ended in a four-toed foot on which the first toe, the hallux, was very short and did not reach the ground. The third toe was longer than the rest. "Albertosaurus" may have been able to reach walking speeds of 14–21 km/hour (8–13 mi/hour). At least for the younger individuals, a high running speed is plausible.
Two skin impressions from "Albertosaurus" are known, and both show scales. One patch was found associated with some gastralic ribs and the impression of a long, unknown bone, indicating that the patch is from the belly. The scales are pebbly and gradually become larger and somewhat hexagonal in shape. Also preserved are two larger feature scales, placed 4.5 cm apart from each other, making "Albertosaurus", along with "Carnotaurus", the only known theropods with preserved feature scales. Another skin impression is from an unknown part of the body. These scales are small, diamond-shaped, and arranged in rows.
Skull and teeth.
The massive skull of "Albertosaurus", which was perched on a muscular, short, S-shaped neck, was about long in the largest adults. Wide openings in the skull, called fenestrae, provided space for muscle attachment sites and sensory organs that reduced its overall weight. Its long jaws contained, both sides combined, 58 or more banana-shaped teeth. Larger tyrannosaurids possessed fewer teeth, but "Gorgosaurus" had 62. Unlike most theropods, "Albertosaurus" and other tyrannosaurids were heterodont, with teeth of different forms depending on their position in the mouth. The premaxillary teeth at the tip of the upper jaw, four per side, were much smaller than the rest, more closely packed, and D-shaped in cross section. Like with "Tyrannosaurus rex", the maxillary (cheek) teeth of "Albertosaurus" were adapted in general form to resist lateral forces exerted by a struggling prey animal. The bite force of "Albertosaurus" was less formidable, however, with the maximum force, by the back teeth, reaching 3,413 Newtons. Above the eyes were short bony crests that may have been brightly coloured in life and possibly used, by males in particular, in courtship to attract a mate.
In 2001, William Abler observed that "Albertosaurus" tooth serrations resemble a crack in the tooth ending in a round void called an ampulla. Tyrannosaurid teeth were used as holdfasts for pulling flesh off a body, so when a tyrannosaur pulled back on a piece of meat, the tension could cause a purely crack-like serration to spread through the tooth. However, the presence of the ampulla distributed these forces over a larger surface area and lessened the risk of damage to the tooth under strain. The presence of incisions ending in voids has parallels in human engineering. Guitar makers use incisions ending in voids to, as Abler describes, "impart alternating regions of flexibility and rigidity" to wood that they work on. The use of a drill to create an "ampulla" of sorts and prevent the propagation of cracks through material is also used to protect aircraft surfaces. Abler demonstrated that a plexiglass bar with incisions called "kerfs" and drilled holes was more than 25% stronger than one with only regularly placed incisions. Unlike tyrannosaurs, more ancient predators, like phytosaurs and "Dimetrodon", had no adaptations to prevent the crack-like serrations of their teeth from spreading when subjected to the forces of feeding.
Classification and systematics.
"Albertosaurus" is a member of the theropod family Tyrannosauridae, specifically the subfamily Albertosaurinae. Its closest relative is the slightly older "Gorgosaurus libratus" (sometimes called "Albertosaurus libratus"; see below). These two species are the only described albertosaurines, but other undescribed species may exist. Thomas Holtz found "Appalachiosaurus" to be an albertosaurine in 2004, but his more recent unpublished work places it as a basal eotyrannosaurian just outside of Tyrannosauridae, in agreement with other authors.
The other major subfamily of tyrannosaurids is Tyrannosaurinae, which includes members like "Daspletosaurus", "Tarbosaurus", and "Tyrannosaurus". Compared with the more robust tyrannosaurines, albertosaurines had slender builds, with proportionately smaller skulls and longer bones of the lower legs (tibia) and feet (metatarsals and phalanges).
Below is the cladogram of Tyrannosauridae based on the phylogenetic analysis conducted by Loewen "et al." in 2013.
Palaeobiology.
Growth pattern.
Most age categories of "Albertosaurus" are represented in the fossil record. Using bone histology, the age of an individual animal at the time of death can often be determined, allowing growth rates to be estimated and compared with other species. The youngest known "Albertosaurus" is a two-year-old discovered in the Dry Island bonebed, which would have weighed about 50 kilograms (110 lb) and measured slightly more than long. The specimen from the same quarry is 28 years old, the oldest and largest one known. When specimens of intermediate age and size are plotted on a graph, an "S"-shaped growth curve results, with the most rapid growth occurring in a four-year period ending around the sixteenth year of life, a pattern also seen in other tyrannosaurids. The growth rate during this phase was per year, based on an adult weighing 1.3 tonnes. Other studies have suggested higher adult weights, which would affect the magnitude of the growth rate, but not the overall pattern. Tyrannosaurids similar in size to "Albertosaurus" had similar growth rates, although the much larger "Tyrannosaurus rex" grew at almost five times this rate ( per year) at its peak. The end of the rapid growth phase suggests the onset of sexual maturity in "Albertosaurus", although growth continued at a slower rate throughout the animals' lives. Sexual maturation while still actively growing appears to be a shared trait among small and large dinosaurs, as well as in large mammals like humans and elephants. This pattern of relatively early sexual maturation differs strikingly from the pattern in birds, which delay their sexual maturity until after they have finished growing.
During growth, thickening of the tooth morphology changed so much that, had the association of young and adult skeletons on the Dry Island bonebed not proven that they belonged to the same taxon, the teeth of juveniles would likely have been identified by statistical analysis as those of a different species.
Life history.
Most known "Albertosaurus" individuals were aged 14 years or older at the time of death. Juvenile animals are rarely fossilized for several reasons, mainly preservation bias, where the smaller bones of younger animals were less likely to be preserved by fossilization than the larger bones of adults, and collection bias, where smaller fossils are less likely to be noticed by collectors in the field. Young "Albertosaurus" are relatively large for juvenile animals, but their remains are still rare in the fossil record when compared to adults. It has been suggested that this phenomenon is a consequence of life history, rather than bias, and that fossils of juvenile "Albertosaurus" are rare because they simply did not die as often as adults did.
A hypothesis of "Albertosaurus" life history postulates that hatchlings died in large numbers, but have not been preserved in the fossil record because of their small size and fragile construction. After just two years, juveniles were larger than any other predator in the region, aside from adult "Albertosaurus", and more fleet-footed than most of their prey animals. This resulted in a dramatic decrease in their mortality rate and a corresponding rarity of fossil remains. Mortality rates doubled at age twelve, perhaps the result of the physiological demands of the rapid growth phase, and then doubled again with the onset of sexual maturity between the ages of fourteen and sixteen. This elevated mortality rate continued throughout adulthood, perhaps due to the high physiological demands of procreation, including stress and injuries received during intraspecific competition for mates and resources, and the eventual, ever-increasing effects of senescence. The higher mortality rate in adults may explain their more common preservation. Very large animals were rare because few individuals survived long enough to attain such size. High infant mortality rates, followed by reduced mortality among juveniles and a sudden increase in mortality after sexual maturity, with very few animals reaching maximum size, is a pattern observed in many modern large mammals, including elephants, African buffalo, and rhinoceros. The same pattern is also seen in other tyrannosaurids. The comparison with modern animals and other tyrannosaurids lends support to this life history hypothesis, but bias in the fossil record may still play a large role, especially since more than two-thirds of all "Albertosaurus" specimens are known from the exact same locality.
Social behaviour.
The Dry Island bonebed discovered by Barnum Brown and his crew contains the remains of 26 "Albertosaurus", the most individuals found in one locality of any large Cretaceous theropod and the second-most of any large theropod dinosaur behind the "Allosaurus" assemblage at the Cleveland-Lloyd Dinosaur Quarry in Utah. The group seems to be composed of one very old adult, eight adults between 17 and 23 years old, seven sub-adults undergoing their rapid growth phases at between 12 and 16 years old, and six juveniles between the ages of 2 and 11 years old that had not yet reached the growth phase.
The near-absence of herbivore remains and the similar state of preservation common to the many individuals at the "Albertosaurus" bonebed quarry led Currie to conclude that the locality was not a predator trap, such as the La Brea Tar Pits in California, and that all of the preserved animals died at the same time. Currie claims this as evidence of pack behavior. Other scientists are skeptical, observing that the animals may have been driven together by a drought, flood, or other reasons.
There is plentiful evidence for gregarious behaviour among herbivorous dinosaurs, including ceratopsians and hadrosaurs. However, only rarely are so many dinosaurian predators found at the same site. Small theropods, like "Deinonychus" and "Coelophysis", have been found in aggregations, as have larger predators, such as "Allosaurus" and "Mapusaurus". There is some evidence of gregarious behaviour in other tyrannosaurids as well, as fragmentary remains of smaller individuals were found alongside "Sue", the "Tyrannosaurus" mounted in the Field Museum of Natural History in Chicago, and a bonebed in the Two Medicine Formation of Montana contains at least three specimens of "Daspletosaurus" preserved alongside several hadrosaurs. These findings may corroborate the evidence for social behaviour in "Albertosaurus", although some or all of the above localities may represent temporary or unnatural aggregations. Others have speculated that, instead of social groups, at least some of these finds represent Komodo dragon-like mobbing of carcasses, where aggressive competition leads to some of the predators being killed and even cannibalized. The evidence of cannibalism was later reported in 2024 by Coppock and Currie.
Currie has also speculated on the pack-hunting habits of "Albertosaurus". The leg proportions of the smaller individuals were comparable to those of ornithomimids, which were probably among the fastest dinosaurs. Younger "Albertosaurus" were probably equally fleet-footed or at least faster than their prey. Currie hypothesized that the younger members of the pack may have been responsible for driving their prey towards the adults, who were larger and more powerful, but also slower. Juveniles may also have had different lifestyles than adults, filling predator niches between the enormous adults and the smaller contemporaneous theropods, the largest of which were two orders of magnitude smaller than adult "Albertosaurus" in mass. A similar situation is observed in modern Komodo dragons, with hatchlings beginning life as small insectivores before growing to become the dominant predators on their islands. However, as the preservation of behaviour in the fossil record is exceedingly rare, these ideas cannot readily be tested. In 2010, Currie, though still favouring the hunting pack hypothesis, admitted that the concentration could have been brought about by other causes, such as a slowly rising water level during an extended flood.
Palaeopathology.
In 2009, researchers hypothesized that smooth-edged holes found in the fossil jaws of tyrannosaurid dinosaurs, such as "Albertosaurus", were caused by a parasite similar to "Trichomonas gallinae", which infects birds. They suggested that tyrannosaurids transmitted the infection by biting each other and that the infection impaired their ability to eat.
In 2001, Bruce Rothschild and others published a study examining evidence for stress fractures and tendon avulsions in theropod dinosaurs and the implications for their behavior. They found that only one of the 319 "Albertosaurus" foot bones checked for stress fractures actually had them and none of the four hand bones did. The scientists found that stress fractures were "significantly" less common in "Albertosaurus" than in the carnosaur "Allosaurus". ROM 807, the holotype of "A. arctunguis" (now referred to "A. sarcophagus"), had a deep hole in the iliac blade, although the describer of the species did not recognize this as pathological. The specimen also contains some exostosis on the fourth left metatarsal. In 1970, two of the five "Albertosaurus sarcophagus" specimens with humeri were reported by Dale Russel as having pathological damage to them.
In 2010, the health of the Dry Island "Albertosaurus" assembly was reported upon. Most specimens showed no sign of disease. On three phalanges of the foot, strange bony spurs that consisted of abnormal ossifications of the tendons, so-called enthesophytes, were present, but their cause is unknown. Two ribs and a belly-rib showed signs of breaking and healing. One adult specimen had a left lower jaw showing a puncture wound and both healed and unhealed bite marks. The low number of abnormalities compares favourably with the health condition of a "Majungasaurus" population of which it was established, in 2007, that 19% of individuals showed bone pathologies.
Palaeoecology.
Most fossils of "Albertosaurus sarcophagus" are known from the upper Horseshoe Canyon Formation in Alberta. These younger units of this geologic formation date to the early Maastrichtian age of the Late Cretaceous period, about 70 to 68 million years ago. Immediately below this formation is the Bearpaw Shale, a marine formation representing a section of the Western Interior Seaway. The Inland Sea was receding as the climate cooled and sea levels subsided towards the end of the Cretaceous, thus exposing land that had previously been underwater. It was not a smooth process, however, and the seaway would periodically rise to cover parts of the region throughout Horseshoe Canyon before finally receding altogether in the years after. Due to the changing sea levels, many different environments are represented in the Horseshoe Canyon Formation, including offshore and near-shore marine habitats and coastal habitats, such as lagoons, estuaries, and tidal flats. Numerous coal seams represent ancient peat swamps. Like most of the other vertebrate fossils from the formation, "Albertosaurus" remains are found in deposits laid down in the deltas and floodplains of large rivers during the later half of Horseshoe Canyon times.
The fauna of the Horseshoe Canyon Formation is well-known, as vertebrate fossils, including those of dinosaurs, are very common. Sharks, rays, sturgeons, bowfins, gars, and the gar-like "Aspidorhynchus" made up the fish fauna. Mammals included multituberculates and the marsupial "Didelphodon". The saltwater plesiosaur "Leurospondylus" has been found in marine sediments in the Horseshoe Canyon, while freshwater environments were populated by turtles, "Champsosaurus", and crocodilians like "Leidyosuchus" and "Stangerochampsa". Dinosaurs dominate the fauna, especially hadrosaurs, which make up half of all dinosaurs known. These include the genera "Edmontosaurus", "Saurolophus", and "Hypacrosaurus". Ceratopsians and ornithomimids were also very common, together making up another third of the known fauna. Along with much rarer ankylosaurians and pachycephalosaurs, all of these animals would have been prey for a diverse array of carnivorous theropods, including troodontids, dromaeosaurids, and caenagnathids. Intermingled with the "Albertosaurus" remains of the Dry Island bonebed, the bones of the small theropod "Albertonykus" were found. Adult "Albertosaurus" were the apex predators in their environment, with intermediate niches possibly filled by juvenile "Albertosaurus".
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Assembly language
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In computing, assembly language (alternatively assembler language or symbolic machine code), often referred to simply as assembly and commonly abbreviated as ASM or asm, is any low-level programming language with a very strong correspondence between the instructions in the language and the architecture's machine code instructions. Assembly language usually has one statement per machine instruction (1:1), but constants, comments, assembler directives, symbolic labels of, e.g., memory locations, registers, and macros are generally also supported.
The first assembly code in which a language is used to represent machine code instructions is found in Kathleen and Andrew Donald Booth's 1947 work, "Coding for A.R.C.". Assembly code is converted into executable machine code by a utility program referred to as an "assembler". The term "assembler" is generally attributed to Wilkes, Wheeler and Gill in their 1951 book "The Preparation of Programs for an Electronic Digital Computer", who, however, used the term to mean "a program that assembles another program consisting of several sections into a single program". The conversion process is referred to as "assembly", as in "assembling" the source code. The computational step when an assembler is processing a program is called "assembly time".
Because assembly depends on the machine code instructions, each assembly language is specific to a particular computer architecture.
Sometimes there is more than one assembler for the same architecture, and sometimes an assembler is specific to an operating system or to particular operating systems. Most assembly languages do not provide specific syntax for operating system calls, and most assembly languages can be used universally with any operating system, as the language provides access to all the real capabilities of the processor, upon which all system call mechanisms ultimately rest. In contrast to assembly languages, most high-level programming languages are generally portable across multiple architectures but require interpreting or compiling, much more complicated tasks than assembling.
In the first decades of computing, it was commonplace for both systems programming and application programming to take place entirely in assembly language. While still irreplaceable for some purposes, the majority of programming is now conducted in higher-level interpreted and compiled languages. In "No Silver Bullet", Fred Brooks summarised the effects of the switch away from assembly language programming: "Surely the most powerful stroke for software productivity, reliability, and simplicity has been the progressive use of high-level languages for programming. Most observers credit that development with at least a factor of five in productivity, and with concomitant gains in reliability, simplicity, and comprehensibility."
Today, it is typical to use small amounts of assembly language code within larger systems implemented in a higher-level language, for performance reasons or to interact directly with hardware in ways unsupported by the higher-level language. For instance, just under 2% of version 4.9 of the Linux kernel source code is written in assembly; more than 97% is written in C.
Assembly language syntax.
Assembly language uses a mnemonic to represent, e.g., each low-level machine instruction or opcode, each directive, typically also each architectural register, flag, etc. Some of the mnemonics may be built-in and some user-defined. Many operations require one or more operands in order to form a complete instruction. Most assemblers permit named constants, registers, and labels for program and memory locations, and can calculate expressions for operands. Thus, programmers are freed from tedious repetitive calculations and assembler programs are much more readable than machine code. Depending on the architecture, these elements may also be combined for specific instructions or addressing modes using offsets or other data as well as fixed addresses. Many assemblers offer additional mechanisms to facilitate program development, to control the assembly process, and to aid debugging.
Some are column oriented, with specific fields in specific columns; this was very common for machines using punched cards in the 1950s and early 1960s. Some assemblers have free-form syntax, with fields separated by delimiters, e.g., punctuation, white space. Some assemblers are hybrid, with, e.g., labels, in a specific column and other fields separated by delimiters; this became more common than column-oriented syntax in the 1960s.
Key concepts.
Assembler.
An assembler program creates object code by translating combinations of mnemonics and syntax for operations and addressing modes into their numerical equivalents. This representation typically includes an "operation code" ("opcode") as well as other control bits and data. The assembler also calculates constant expressions and resolves symbolic names for memory locations and other entities. The use of symbolic references is a key feature of assemblers, saving tedious calculations and manual address updates after program modifications. Most assemblers also include macro facilities for performing textual substitution – e.g., to generate common short sequences of instructions as inline, instead of "called" subroutines.
Some assemblers may also be able to perform some simple types of instruction set-specific optimizations. One concrete example of this may be the ubiquitous x86 assemblers from various vendors. Called jump-sizing, most of them are able to perform jump-instruction replacements (long jumps replaced by short or relative jumps) in any number of passes, on request. Others may even do simple rearrangement or insertion of instructions, such as some assemblers for RISC architectures that can help optimize a sensible instruction scheduling to exploit the CPU pipeline as efficiently as possible.
Assemblers have been available since the 1950s, as the first step above machine language and before high-level programming languages such as Fortran, Algol, COBOL and Lisp. There have also been several classes of translators and semi-automatic code generators with properties similar to both assembly and high-level languages, with Speedcode as perhaps one of the better-known examples.
There may be several assemblers with different syntax for a particular CPU or instruction set architecture. For instance, an instruction to add memory data to a register in a x86-family processor might be codice_1, in original "Intel syntax", whereas this would be written codice_2 in the "AT&T syntax" used by the GNU Assembler. Despite different appearances, different syntactic forms generally generate the same numeric machine code. A single assembler may also have different modes in order to support variations in syntactic forms as well as their exact semantic interpretations (such as FASM-syntax, TASM-syntax, ideal mode, etc., in the special case of x86 assembly programming).
Number of passes.
There are two types of assemblers based on how many passes through the source are needed (how many times the assembler reads the source) to produce the object file.
In both cases, the assembler must be able to determine the size of each instruction on the initial passes in order to calculate the addresses of subsequent symbols. This means that if the size of an operation referring to an operand defined later depends on the type or distance of the operand, the assembler will make a pessimistic estimate when first encountering the operation, and if necessary, pad it with one or more
"no-operation" instructions in a later pass or the errata. In an assembler with peephole optimization, addresses may be recalculated between passes to allow replacing pessimistic code with code tailored to the exact distance from the target.
The original reason for the use of one-pass assemblers was memory size and speed of assembly – often a second pass would require storing the symbol table in memory (to handle forward references), rewinding and rereading the program source on tape, or rereading a deck of cards or punched paper tape. Later computers with much larger memories (especially disc storage), had the space to perform all necessary processing without such re-reading. The advantage of the multi-pass assembler is that the absence of errata makes the linking process (or the program load if the assembler directly produces executable code) faster.
Example: in the following code snippet, a one-pass assembler would be able to determine the address of the backward reference BKWD when assembling statement S2, but would not be able to determine the address of the forward reference FWD when assembling the branch statement S1; indeed, FWD may be undefined. A two-pass assembler would determine both addresses in pass 1, so they would be known when generating code in pass 2.
B
EQU *
EQU *
B
High-level assemblers.
More sophisticated high-level assemblers provide language abstractions such as:
See Language design below for more details.
Assembly language.
A program written in assembly language consists of a series of mnemonic processor instructions and meta-statements (known variously as declarative operations, directives, pseudo-instructions, pseudo-operations and pseudo-ops), comments and data. Assembly language instructions usually consist of an opcode mnemonic followed by an operand, which might be a list of data, arguments or parameters. Some instructions may be "implied", which means the data upon which the instruction operates is implicitly defined by the instruction itself—such an instruction does not take an operand. The resulting statement is translated by an assembler into machine language instructions that can be loaded into memory and executed.
For example, the instruction below tells an x86/IA-32 processor to move an immediate 8-bit value into a register. The binary code for this instruction is 10110 followed by a 3-bit identifier for which register to use. The identifier for the "AL" register is 000, so the following machine code loads the "AL" register with the data 01100001.
10110000 01100001
This binary computer code can be made more human-readable by expressing it in hexadecimal as follows.
B0 61
Here, codice_3 means "Move a copy of the following value into "AL"", and codice_4 is a hexadecimal representation of the value 01100001, which is 97 in decimal. Assembly language for the 8086 family provides the mnemonic MOV (an abbreviation of "move") for instructions such as this, so the machine code above can be written as follows in assembly language, complete with an explanatory comment if required, after the semicolon. This is much easier to read and to remember.
MOV AL, 61h ; Load AL with 97 decimal (61 hex)
In some assembly languages (including this one) the same mnemonic, such as MOV, may be used for a family of related instructions for loading, copying and moving data, whether these are immediate values, values in registers, or memory locations pointed to by values in registers or by immediate (a.k.a. direct) addresses. Other assemblers may use separate opcode mnemonics such as L for "move memory to register", ST for "move register to memory", LR for "move register to register", MVI for "move immediate operand to memory", etc.
If the same mnemonic is used for different instructions, that means that the mnemonic corresponds to several different binary instruction codes, excluding data (e.g. the codice_5 in this example), depending on the operands that follow the mnemonic. For example, for the x86/IA-32 CPUs, the Intel assembly language syntax codice_6 represents an instruction that moves the contents of register "AH" into register "AL". The hexadecimal form of this instruction is:
88 E0
The first byte, 88h, identifies a move between a byte-sized register and either another register or memory, and the second byte, E0h, is encoded (with three bit-fields) to specify that both operands are registers, the source is "AH", and the destination is "AL".
In a case like this where the same mnemonic can represent more than one binary instruction, the assembler determines which instruction to generate by examining the operands. In the first example, the operand codice_5 is a valid hexadecimal numeric constant and is not a valid register name, so only the codice_3 instruction can be applicable. In the second example, the operand codice_9 is a valid register name and not a valid numeric constant (hexadecimal, decimal, octal, or binary), so only the codice_10 instruction can be applicable.
Assembly languages are always designed so that this sort of lack of ambiguity is universally enforced by their syntax. For example, in the Intel x86 assembly language, a hexadecimal constant must start with a numeral digit, so that the hexadecimal number 'A' (equal to decimal ten) would be written as codice_11 or codice_12, not codice_9, specifically so that it cannot appear to be the name of register "AH". (The same rule also prevents ambiguity with the names of registers "BH", "CH", and "DH", as well as with any user-defined symbol that ends with the letter "H" and otherwise contains only characters that are hexadecimal digits, such as the word "BEACH".)
Returning to the original example, while the x86 opcode 10110000 (codice_3) copies an 8-bit value into the "AL" register, 10110001 (codice_15) moves it into "CL" and 10110010 (codice_16) does so into "DL". Assembly language examples for these follow.
MOV AL, 1h ; Load AL with immediate value 1
MOV CL, 2h ; Load CL with immediate value 2
MOV DL, 3h ; Load DL with immediate value 3
The syntax of MOV can also be more complex as the following examples show.
MOV EAX, [EBX] ; Move the 4 bytes in memory at the address contained in EBX into EAX
MOV [ESI+EAX], CL ; Move the contents of CL into the byte at address ESI+EAX
MOV DS, DX ; Move the contents of DX into segment register DS
In each case, the MOV mnemonic is translated directly into one of the opcodes 88-8C, 8E, A0-A3, B0-BF, C6 or C7 by an assembler, and the programmer normally does not have to know or remember which.
Transforming assembly language into machine code is the job of an assembler, and the reverse can at least partially be achieved by a disassembler. Unlike high-level languages, there is a one-to-one correspondence between many simple assembly statements and machine language instructions. However, in some cases, an assembler may provide "pseudoinstructions" (essentially macros) which expand into several machine language instructions to provide commonly needed functionality. For example, for a machine that lacks a "branch if greater or equal" instruction, an assembler may provide a pseudoinstruction that expands to the machine's "set if less than" and "branch if zero (on the result of the set instruction)". Most full-featured assemblers also provide a rich macro language (discussed below) which is used by vendors and programmers to generate more complex code and data sequences. Since the information about pseudoinstructions and macros defined in the assembler environment is not present in the object program, a disassembler cannot reconstruct the macro and pseudoinstruction invocations but can only disassemble the actual machine instructions that the assembler generated from those abstract assembly-language entities. Likewise, since comments in the assembly language source file are ignored by the assembler and have no effect on the object code it generates, a disassembler is always completely unable to recover source comments.
Each computer architecture has its own machine language. Computers differ in the number and type of operations they support, in the different sizes and numbers of registers, and in the representations of data in storage. While most general-purpose computers are able to carry out essentially the same functionality, the ways they do so differ; the corresponding assembly languages reflect these differences.
Multiple sets of mnemonics or assembly-language syntax may exist for a single instruction set, typically instantiated in different assembler programs. In these cases, the most popular one is usually that supplied by the CPU manufacturer and used in its documentation.
Two examples of CPUs that have two different sets of mnemonics are the Intel 8080 family and the Intel 8086/8088. Because Intel claimed copyright on its assembly language mnemonics (on each page of their documentation published in the 1970s and early 1980s, at least), some companies that independently produced CPUs compatible with Intel instruction sets invented their own mnemonics. The Zilog Z80 CPU, an enhancement of the Intel 8080A, supports all the 8080A instructions plus many more; Zilog invented an entirely new assembly language, not only for the new instructions but also for all of the 8080A instructions. For example, where Intel uses the mnemonics "MOV", "MVI", "LDA", "STA", "LXI", "LDAX", "STAX", "LHLD", and "SHLD" for various data transfer instructions, the Z80 assembly language uses the mnemonic "LD" for all of them. A similar case is the NEC V20 and V30 CPUs, enhanced copies of the Intel 8086 and 8088, respectively. Like Zilog with the Z80, NEC invented new mnemonics for all of the 8086 and 8088 instructions, to avoid accusations of infringement of Intel's copyright. (It is questionable whether such copyrights can be valid, and later CPU companies such as AMD and Cyrix republished Intel's x86/IA-32 instruction mnemonics exactly with neither permission nor legal penalty.) It is doubtful whether in practice many people who programmed the V20 and V30 actually wrote in NEC's assembly language rather than Intel's; since any two assembly languages for the same instruction set architecture are isomorphic (somewhat like English and Pig Latin), there is no requirement to use a manufacturer's own published assembly language with that manufacturer's products.
"Hello, world!" on x86 Linux.
In 32-bit assembly language for Linux on an x86 processor, "Hello, world!" can be printed like this.
section .text
global _start
_start:
mov edx,len ; length of string, third argument to write()
mov ecx,msg ; address of string, second argument to write()
mov ebx,1 ; file descriptor (standard output), first argument to write()
mov eax,4 ; system call number for write()
int 0x80 ; system call trap
mov ebx,0 ; exit code, first argument to exit()
mov eax,1 ; system call number for exit()
int 0x80 ; system call trap
section .data
msg db 'Hello, world!', 0xa
len equ $ - msg
Language design.
Basic elements.
There is a large degree of diversity in the way the authors of assemblers categorize statements and in the nomenclature that they use. In particular, some describe anything other than a machine mnemonic or extended mnemonic as a pseudo-operation (pseudo-op). A typical assembly language consists of 3 types of instruction statements that are used to define program operations:
Opcode mnemonics and extended mnemonics.
Instructions (statements) in assembly language are generally very simple, unlike those in high-level languages. Generally, a mnemonic is a symbolic name for a single executable machine language instruction (an opcode), and there is at least one opcode mnemonic defined for each machine language instruction. Each instruction typically consists of an "operation" or "opcode" plus zero or more "operands". Most instructions refer to a single value or a pair of values. Operands can be immediate (value coded in the instruction itself), registers specified in the instruction or implied, or the addresses of data located elsewhere in storage. This is determined by the underlying processor architecture: the assembler merely reflects how this architecture works. "Extended mnemonics" are often used to specify a combination of an opcode with a specific operand, e.g., the System/360 assemblers use as an extended mnemonic for with a mask of 15 and ("NO OPeration" – do nothing for one step) for with a mask of 0.
"Extended mnemonics" are often used to support specialized uses of instructions, often for purposes not obvious from the instruction name. For example, many CPU's do not have an explicit NOP instruction, but do have instructions that can be used for the purpose. In 8086 CPUs the instruction is used for , with being a pseudo-opcode to encode the instruction . Some disassemblers recognize this and will decode the instruction as . Similarly, IBM assemblers for System/360 and System/370 use the extended mnemonics and for and with zero masks. For the SPARC architecture, these are known as "synthetic instructions".
Some assemblers also support simple built-in macro-instructions that generate two or more machine instructions. For instance, with some Z80 assemblers the instruction is recognized to generate followed by . These are sometimes known as "pseudo-opcodes".
Mnemonics are arbitrary symbols; in 1985 the IEEE published Standard 694 for a uniform set of mnemonics to be used by all assemblers. The standard has since been withdrawn.
Data directives.
There are instructions used to define data elements to hold data and variables. They define the type of data, the length and the alignment of data. These instructions can also define whether the data is available to outside programs (programs assembled separately) or only to the program in which the data section is defined. Some assemblers classify these as pseudo-ops.
Assembly directives.
Assembly directives, also called pseudo-opcodes, pseudo-operations or pseudo-ops, are commands given to an assembler "directing it to perform operations other than assembling instructions". Directives affect how the assembler operates and "may affect the object code, the symbol table, the listing file, and the values of internal assembler parameters". Sometimes the term "pseudo-opcode" is reserved for directives that generate object code, such as those that generate data.
The names of pseudo-ops often start with a dot to distinguish them from machine instructions. Pseudo-ops can make the assembly of the program dependent on parameters input by a programmer, so that one program can be assembled in different ways, perhaps for different applications. Or, a pseudo-op can be used to manipulate presentation of a program to make it easier to read and maintain. Another common use of pseudo-ops is to reserve storage areas for run-time data and optionally initialize their contents to known values.
Symbolic assemblers let programmers associate arbitrary names ("labels" or "symbols") with memory locations and various constants. Usually, every constant and variable is given a name so instructions can reference those locations by name, thus promoting self-documenting code. In executable code, the name of each subroutine is associated with its entry point, so any calls to a subroutine can use its name. Inside subroutines, GOTO destinations are given labels. Some assemblers support "local symbols" which are often lexically distinct from normal symbols (e.g., the use of "10$" as a GOTO destination).
Some assemblers, such as NASM, provide flexible symbol management, letting programmers manage different namespaces, automatically calculate offsets within data structures, and assign labels that refer to literal values or the result of simple computations performed by the assembler. Labels can also be used to initialize constants and variables with relocatable addresses.
Assembly languages, like most other computer languages, allow comments to be added to program source code that will be ignored during assembly. Judicious commenting is essential in assembly language programs, as the meaning and purpose of a sequence of binary machine instructions can be difficult to determine. The "raw" (uncommented) assembly language generated by compilers or disassemblers is quite difficult to read when changes must be made.
Macros.
Many assemblers support "predefined macros", and others support "programmer-defined" (and repeatedly re-definable) macros involving sequences of text lines in which variables and constants are embedded. The macro definition is most commonly a mixture of assembler statements, e.g., directives, symbolic machine instructions, and templates for assembler statements. This sequence of text lines may include opcodes or directives. Once a macro has been defined its name may be used in place of a mnemonic. When the assembler processes such a statement, it replaces the statement with the text lines associated with that macro, then processes them as if they existed in the source code file (including, in some assemblers, expansion of any macros existing in the replacement text). Macros in this sense date to IBM autocoders of the 1950s.
Macro assemblers typically have directives to, e.g., define macros, define variables, set variables to the result of an arithmetic, logical or string expression, iterate, conditionally generate code. Some of those directives may be restricted to use within a macro definition, e.g., MEXIT in HLASM, while others may be permitted within open code (outside macro definitions), e.g., AIF and COPY in HLASM.
In assembly language, the term "macro" represents a more comprehensive concept than it does in some other contexts, such as the pre-processor in the C programming language, where its #define directive typically is used to create short single line macros. Assembler macro instructions, like macros in PL/I and some other languages, can be lengthy "programs" by themselves, executed by interpretation by the assembler during assembly.
Since macros can have 'short' names but expand to several or indeed many lines of code, they can be used to make assembly language programs appear to be far shorter, requiring fewer lines of source code, as with higher level languages. They can also be used to add higher levels of structure to assembly programs, optionally introduce embedded debugging code via parameters and other similar features.
Macro assemblers often allow macros to take parameters. Some assemblers include quite sophisticated macro languages, incorporating such high-level language elements as optional parameters, symbolic variables, conditionals, string manipulation, and arithmetic operations, all usable during the execution of a given macro, and allowing macros to save context or exchange information. Thus a macro might generate numerous assembly language instructions or data definitions, based on the macro arguments. This could be used to generate record-style data structures or "unrolled" loops, for example, or could generate entire algorithms based on complex parameters. For instance, a "sort" macro could accept the specification of a complex sort key and generate code crafted for that specific key, not needing the run-time tests that would be required for a general procedure interpreting the specification. An organization using assembly language that has been heavily extended using such a macro suite can be considered to be working in a higher-level language since such programmers are not working with a computer's lowest-level conceptual elements. Underlining this point, macros were used to implement an early virtual machine in SNOBOL4 (1967), which was written in the SNOBOL Implementation Language (SIL), an assembly language for a virtual machine. The target machine would translate this to its native code using a macro assembler. This allowed a high degree of portability for the time.
Macros were used to customize large scale software systems for specific customers in the mainframe era and were also used by customer personnel to satisfy their employers' needs by making specific versions of manufacturer operating systems. This was done, for example, by systems programmers working with IBM's Conversational Monitor System / Virtual Machine (VM/CMS) and with IBM's "real time transaction processing" add-ons, Customer Information Control System CICS, and ACP/TPF, the airline/financial system that began in the 1970s and still runs many large computer reservation systems (CRS) and credit card systems today.
It is also possible to use solely the macro processing abilities of an assembler to generate code written in completely different languages, for example, to generate a version of a program in COBOL using a pure macro assembler program containing lines of COBOL code inside assembly time operators instructing the assembler to generate arbitrary code. IBM OS/360 uses macros to perform system generation. The user specifies options by coding a series of assembler macros. Assembling these macros generates a job stream to build the system, including job control language and utility control statements.
This is because, as was realized in the 1960s, the concept of "macro processing" is independent of the concept of "assembly", the former being in modern terms more word processing, text processing, than generating object code. The concept of macro processing appeared, and appears, in the C programming language, which supports "preprocessor instructions" to set variables, and make conditional tests on their values. Unlike certain previous macro processors inside assemblers, the C preprocessor is not Turing-complete because it lacks the ability to either loop or "go to", the latter allowing programs to loop.
Despite the power of macro processing, it fell into disuse in many high level languages (major exceptions being C, C++ and PL/I) while remaining a perennial for assemblers.
Macro parameter substitution is strictly by name: at macro processing time, the value of a parameter is textually substituted for its name. The most famous class of bugs resulting was the use of a parameter that itself was an expression and not a simple name when the macro writer expected a name. In the macro:
foo: macro a
load a*b
the intention was that the caller would provide the name of a variable, and the "global" variable or constant b would be used to multiply "a". If foo is called with the parameter codice_17, the macro expansion of codice_18 occurs. To avoid any possible ambiguity, users of macro processors can parenthesize formal parameters inside macro definitions, or callers can parenthesize the input parameters.
Support for structured programming.
Packages of macros have been written providing structured programming elements to encode execution flow. The earliest example of this approach was in the Concept-14 macro set, originally proposed by Harlan Mills (March 1970), and implemented by Marvin Kessler at IBM's Federal Systems Division, which provided IF/ELSE/ENDIF and similar control flow blocks for OS/360 assembler programs. This was a way to reduce or eliminate the use of GOTO operations in assembly code, one of the main factors causing spaghetti code in assembly language. This approach was widely accepted in the early 1980s (the latter days of large-scale assembly language use). IBM's High Level Assembler Toolkit includes such a macro package.
Another design was A-Natural, a "stream-oriented" assembler for 8080/Z80 processors from Whitesmiths Ltd. (developers of the Unix-like Idris operating system, and what was reported to be the first commercial C compiler). The language was classified as an assembler because it worked with raw machine elements such as opcodes, registers, and memory references; but it incorporated an expression syntax to indicate execution order. Parentheses and other special symbols, along with block-oriented structured programming constructs, controlled the sequence of the generated instructions. A-natural was built as the object language of a C compiler, rather than for hand-coding, but its logical syntax won some fans.
There has been little apparent demand for more sophisticated assemblers since the decline of large-scale assembly language development. In spite of that, they are still being developed and applied in cases where resource constraints or peculiarities in the target system's architecture prevent the effective use of higher-level languages.
Assemblers with a strong macro engine allow structured programming via macros, such as the switch macro provided with the Masm32 package (this code is a complete program):
include \masm32\include\masm32rt.inc ; use the Masm32 library
.code
demomain:
REPEAT 20
switch rv(nrandom, 9) ; generate a number between 0 and 8
mov ecx, 7
case 0
print "case 0"
case ecx ; in contrast to most other programming languages,
print "case 7" ; the Masm32 switch allows "variable cases"
case 1 .. 3
.if eax==1
print "case 1"
.elseif eax==2
print "case 2"
.else
print "cases 1 to 3: other"
.endif
case 4, 6, 8
print "cases 4, 6 or 8"
default
mov ebx, 19 ; print 20 stars
.Repeat
print "*"
dec ebx
.Until Sign? ; loop until the sign flag is set
endsw
print chr$(13, 10)
ENDM
exit
end demomain
Use of assembly language.
When the stored-program computer was introduced, programs were written in machine code, and loaded into the computer from punched paper tape or toggled directly into memory from console switches. Kathleen Booth "is credited with inventing assembly language" based on theoretical work she began in 1947, while working on the ARC2 at Birkbeck, University of London, following consultation by Andrew Booth (later her husband) with mathematician John von Neumann and physicist Herman Goldstine at the Institute for Advanced Study.
In late 1948, the Electronic Delay Storage Automatic Calculator (EDSAC) had an assembler (named "initial orders") integrated into its bootstrap program. It used one-letter mnemonics developed by David Wheeler, who is credited by the IEEE Computer Society as the creator of the first "assembler". Reports on the EDSAC introduced the term "assembly" for the process of combining fields into an instruction word. SOAP (Symbolic Optimal Assembly Program) was an assembly language for the IBM 650 computer written by Stan Poley in 1955.
Assembly languages eliminated much of the error-prone, tedious, and time-consuming first-generation programming needed with the earliest computers, freeing programmers from tedium such as remembering numeric codes and calculating addresses. They were once widely used for all sorts of programming. By the late 1950s their use had largely been supplanted by higher-level languages in the search for improved programming productivity. Today, assembly language is still used for direct hardware manipulation, access to specialized processor instructions, or to address critical performance issues. Typical uses are device drivers, low-level embedded systems, and real-time systems (see ).
Numerous programs were written entirely in assembly language. The Burroughs MCP (1961) was the first computer for which an operating system was not developed entirely in assembly language; it was written in Executive Systems Problem Oriented Language (ESPOL), an Algol dialect. Many commercial applications were written in assembly language as well, including a large amount of the IBM mainframe software developed by large corporations. COBOL, FORTRAN and some PL/I eventually displaced assembly language, although a number of large organizations retained assembly-language application infrastructures well into the 1990s.
Assembly language was the primary development language for 8-bit home computers such as the Apple II, Atari 8-bit computers, ZX Spectrum, and Commodore 64. Interpreted BASIC on these systems did not offer maximum execution speed and full use of facilities to take full advantage of the available hardware. Assembly language was the default choice for programming 8-bit consoles such as the Atari 2600 and Nintendo Entertainment System.
Key software for IBM PC compatibles such as MS-DOS, Turbo Pascal, and the Lotus 1-2-3 spreadsheet was written in assembly language. As computer speed grew exponentially, assembly language became a tool for speeding up parts of programs, such as the rendering of "Doom", rather than a dominant development language. In the 1990s, assembly language was used to maximise performance from systems such as the Sega Saturn, and as the primary language for arcade hardware using the TMS34010 integrated CPU/GPU such as "Mortal Kombat" and "NBA Jam".
Current usage.
There has been debate over the usefulness and performance of assembly language relative to high-level languages.
Although assembly language has specific niche uses where it is important (see below), there are other tools for optimization.
, the TIOBE index of programming language popularity ranks assembly language at 11, ahead of Visual Basic, for example. Assembler can be used to optimize for speed or optimize for size. In the case of speed optimization, modern optimizing compilers are claimed to render high-level languages into code that can run as fast as hand-written assembly, despite some counter-examples. The complexity of modern processors and memory sub-systems makes effective optimization increasingly difficult for compilers and assembly programmers alike. Increasing processor performance has meant that most CPUs sit idle most of the time, with delays caused by predictable bottlenecks such as cache misses, I/O operations and paging, making raw code execution speed a non-issue for many programmers.
There are still certain computer programming domains in which the use of assembly programming is more common:
Assembly language is still taught in most computer science and electronic engineering programs. Although few programmers today regularly work with assembly language as a tool, the underlying concepts remain important. Such fundamental topics as binary arithmetic, memory allocation, stack processing, character set encoding, interrupt processing, and compiler design would be hard to study in detail without a grasp of how a computer operates at the hardware level. Since a computer's behaviour is fundamentally defined by its instruction set, the logical way to learn such concepts is to study an assembly language. Most modern computers have similar instruction sets. Therefore, studying a single assembly language is sufficient to learn the basic concepts, recognize situations where the use of assembly language might be appropriate, and to see how efficient executable code can be created from high-level languages.
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Ambrosia
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In the ancient Greek myths, ambrosia (, ) is the food or drink of the Greek gods, and is often depicted as conferring longevity or immortality upon whoever consumed it. It was brought to the gods in Olympus by doves and served either by Hebe or by Ganymede at the heavenly feast.
Ancient art sometimes depicted ambrosia as distributed by the nymph named Ambrosia, a nurse of Dionysus.
Definition.
Ambrosia is very closely related to the gods' other form of sustenance, "nectar". The two terms may not have originally been distinguished; though in Homer's poems nectar is usually the drink and ambrosia the food of the gods; it was with ambrosia that Hera "cleansed all defilement from her lovely flesh", and with ambrosia Athena prepared Penelope in her sleep, so that when she appeared for the final time before her suitors, the effects of years had been stripped away, and they were inflamed with passion at the sight of her. On the other hand, in Alcman, nectar is the food, and in Sappho and Anaxandrides, ambrosia is the drink. A character in Aristophanes' "Knights" says, "I dreamed the goddess poured ambrosia over your head—out of a ladle." Both descriptions could be correct, as ambrosia could be a liquid considered a food (such as honey).
The consumption of ambrosia was typically reserved for divine beings. Upon his assumption into immortality on Olympus, Heracles is given ambrosia by Athena, while the hero Tydeus is denied the same thing when the goddess discovers him eating human brains. In one version of the myth of Tantalus, part of Tantalus' crime is that after tasting ambrosia himself, he attempts to steal some to give to other mortals. Those who consume ambrosia typically have ichor, not blood, in their veins.
Both nectar and ambrosia are fragrant, and may be used as perfume: in the "Odyssey" Menelaus and his men are disguised as seals in untanned seal skins, "and the deadly smell of the seal skins vexed us sore; but the goddess saved us; she brought ambrosia and put it under our nostrils." Homer speaks of ambrosial raiment, ambrosial locks of hair, even the gods' ambrosial sandals.
Among later writers, ambrosia has been so often used with generic meanings of "delightful liquid" that such late writers as Athenaeus, Paulus and Dioscurides employ it as a technical term in contexts of cookery, medicine, and botany. Pliny used the term in connection with different plants, as did early herbalists.
Additionally, some modern ethnomycologists, such as Danny Staples, identify ambrosia with the hallucinogenic mushroom "Amanita muscaria": "it was the food of the gods, their ambrosia, and nectar was the pressed sap of its juices", Staples asserts.
W. H. Roscher thinks that both nectar and ambrosia were kinds of honey, in which case their power of conferring immortality would be due to the supposed healing and cleansing powers of honey, and because fermented honey (mead) preceded wine as an entheogen in the Aegean world; on some Minoan seals, goddesses were represented with bee faces (compare Merope and Melissa).
Etymology.
The concept of an immortality drink is attested in at least two ancient Indo-European languages: Greek and Sanskrit. The Greek ἀμβροσία ("ambrosia") is semantically linked to the Sanskrit ("amṛta") as both words denote a drink or food that gods use to achieve immortality. The two words appear to be derived from the same Indo-European form *"ṇ-mṛ-tós", "un-dying" ("n-": negative prefix from which the prefix "a-" in both Greek and Sanskrit are derived; "mṛ": zero grade of *"mer-", "to die"; and "-to-": adjectival suffix). A semantically similar etymology exists for nectar, the beverage of the gods (Greek: νέκταρ "néktar") presumed to be a compound of the PIE roots "*nek-", "death", and "-*tar", "overcoming".
Ambrosia (nymph).
Lycurgus, king of Thrace, forbade the cult of Dionysus, whom he drove from Thrace, and attacked the gods' entourage when they celebrated the god. Among them was Ambrosia, who turned herself into a grapevine to hide from his wrath. Dionysus, enraged by the king's actions, drove him mad. In his fit of insanity he killed his son, whom he mistook for a stock of ivy, and then himself.
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Ambrose
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Ambrose of Milan (; 4 April 397), venerated as Saint Ambrose, was a theologian and statesman who served as Bishop of Milan from 374 to 397. He expressed himself prominently as a public figure, fiercely promoting Roman Christianity against Arianism and paganism. He left a substantial collection of writings, of which the best known include the ethical commentary "De officiis ministrorum" (377–391), and the exegetical (386–390). His preaching, his actions and his literary works, in addition to his innovative musical hymnography, made him one of the most influential ecclesiastical figures of the 4th century.
Ambrose was serving as the Roman governor of Aemilia-Liguria in Milan when he was unexpectedly made Bishop of Milan in 374 by popular acclamation. As bishop, he took a firm position against Arianism and attempted to mediate the conflict between the emperors Theodosius I and Magnus Maximus. Tradition credits Ambrose with developing an antiphonal chant, known as Ambrosian chant, and for composing the "Te Deum" hymn, though modern scholars now reject both of these attributions. Ambrose's authorship on at least four hymns, including the well-known "Veni redemptor gentium", is secure; they form the core of the Ambrosian hymns, which includes others that are sometimes attributed to him. He also had a notable influence on Augustine of Hippo (354–430), whom he helped convert to Christianity.
Western Christianity identified Ambrose, along with Augustine, Jerome and pope Gregory the Great, as one of the four Great Latin Church Fathers, declared Doctors of the Church in 1298. He is considered a saint by the Catholic Church, Eastern Orthodox Church, Anglican Communion, and various Lutheran denominations, and venerated as the patron saint of Milan and beekeepers.
Background and career.
Legends about Ambrose had spread through the empire long before his biography was written, making it difficult for modern historians to understand his true character and fairly place his behaviour within the context of antiquity. Most agree he was the personification of his era. This would make Ambrose a genuinely spiritual man who spoke up and defended his faith against opponents, an aristocrat who retained many of the attitudes and practices of a Roman governor, and also an ascetic who served the poor.
Early life.
Ambrose was born into a Roman Christian family, of Greek descent, in the year 339. Ambrose himself wrote that he was 53 years old in his letter number 49, which has been dated to 392. He began life in Augusta Treverorum (modern Trier) the capital of the Roman province of Gallia Belgica in what was then northeastern Gaul and is now in the Rhineland-Palatinate in Germany. Scholars disagree on who exactly his father was. His father is sometimes identified with Aurelius Ambrosius, a praetorian prefect of Gaul; but some scholars identify his father as an official named Uranius who received an imperial constitution dated 3 February 339 (addressed in a brief extract from one of the three emperors ruling in 339, Constantine II, Constantius II, or Constans, in the "Codex Theodosianus", book XI.5). What does seem certain is that Ambrose was born in Trier and his father was either the praetorian prefect or part of his administration.
A legend about Ambrose as an infant recounts that a swarm of bees settled on his face while he lay in his cradle, leaving behind a drop of honey. His father is said to have considered this a sign of his future eloquence and honeyed tongue. Bees and beehives often appear in the saint's symbology.
Ambrose's mother was a woman of intellect and piety. It was probable that she was a member of the Roman family "Aurelii Symmachi", which would make Ambrose a cousin of the orator Quintus Aurelius Symmachus. The family had produced one martyr (the virgin Soteris) in its history. Ambrose was the youngest of three children. His siblings were Satyrus, the subject of Ambrose's "De excessu fratris Satyri", and Marcellina, who made a profession of virginity sometime between 352 and 355; Pope Liberius himself conferred the veil upon her. Both Ambrose's siblings also became venerated as saints.
Sometime early in the life of Ambrose, his father died. At an unknown later date, his mother left Trier with her three children, and the family moved to Rome. There Ambrose studied literature, law, and rhetoric. He then followed in his father's footsteps and entered public service. Praetorian Prefect Sextus Claudius Petronius Probus first gave him a place as a judicial councillor, and then in about 372 made him governor of the province of Liguria and Emilia, with headquarters in Milan.
Bishop of Milan.
In 374 the bishop of Milan, Auxentius, an Arian, died, and the Arians challenged the succession. Ambrose went to the church where the election was to take place to prevent an uproar which seemed probable in this crisis. His address was interrupted by a call, "Ambrose, bishop!", which was taken up by the whole assembly.
Ambrose, though known to be Nicene Christian in belief, was considered acceptable to Arians due to the charity he had shown concerning their beliefs. At first, he energetically refused the office of bishop, for which he felt he was in no way prepared: Ambrose was a relatively new Christian who was not yet baptized nor formally trained in theology. Ambrose fled to a colleague's home, seeking to hide. Upon receiving a letter from the Emperor Gratian praising the appropriateness of Rome appointing individuals worthy of holy positions, Ambrose's host gave him up. Within a week, he was baptized, ordained and duly consecrated as the new bishop of Milan. This was the first time in the West that a member of the upper class of high officials had accepted the office of bishop.
As bishop, he immediately adopted an ascetic lifestyle, apportioned his money to the poor, donating all of his land, making only provision for his sister Marcellina. While Bishop of Milan, Ambrose carefully cultivated practices that respected local customs and that reflected his spiritual beliefs. He understood the link between a religious leader's life and their ability to model morality for congregants. In his work "De Officiis" (377–391), he asked, "How can you consider a man to be better than you when it comes to giving advice if you see that he is worse than you when it comes to morality?" His humble and upright ways raised his standing among his people even further; it was his popularity with the people that gave him considerable political leverage throughout his career. Upon the unexpected appointment of Ambrose to the episcopate, his brother Satyrus resigned a prefecture in order to move to Milan, where he took over managing the diocese's temporal affairs.
Arianism.
Arius (died 336) was a Christian priest who around the year 300 asserted that God the Father must have created the Son, indicating that the Son was a lesser being who was not eternal and of a different "essence" from God the Father. This Christology, though contrary to tradition, quickly spread through Egypt, Libya and other Roman provinces. Bishops engaged in the dispute, and the people divided into parties, sometimes demonstrating in the streets in support of one side or the other.
Arianism appealed to many high-level leaders and clergy in both the Western and Eastern empires. Although the western Emperor Gratian () supported orthodoxy, his younger half brother Valentinian II, who became his colleague in the empire in 375, adhered to the Arian creed. Ambrose sought to refute Arian propositions theologically, but Ambrose did not sway the young prince's position. In the East, Emperor Theodosius I () likewise professed the Nicene creed; but there were many adherents of Arianism throughout his dominions, especially among the higher clergy.
In this state of religious ferment, two leaders of the Arians, bishops Palladius of Ratiaria and Secundianus of Singidunum, confident of numbers, prevailed upon Gratian to call a general council from all parts of the empire. This request appeared so equitable that Gratian complied without hesitation. However, Ambrose feared the consequences and prevailed upon the emperor to have the matter determined by a council of the Western bishops. Accordingly, a synod composed of thirty-two bishops was held at Aquileia in the year 381. Ambrose was elected president and Palladius, being called upon to defend his opinions, declined. A vote was then taken and Palladius and his associate Secundianus were deposed from their episcopal offices.
Ambrose struggled with Arianism for over half of his term in the episcopate. Ecclesiastical unity was important to the church, but it was no less important to the state, and as a Roman, Ambrose felt strongly about that. Conflict over heresies loomed large in an age of religious ferment comparable to the Reformation of the fourteenth and fifteenth centuries. Orthodox Christianity was determining how to define itself as it faced multiple challenges on both a theological and a practical level, and Ambrose exercised crucial influence at a crucial time.
Imperial relations.
Ambrose had good relations and varying levels of influence with the Roman emperors Gratian, Valentinian II and Theodosius I, but exactly how much influence, what kind of influence, and in what ways, when, has been debated in the scholarship of the late twentieth and early twenty-first centuries.
Gratian.
It has long been convention to see Gratian and Ambrose as having a personal friendship, putting Ambrose in the dominant role of spiritual guide, but modern scholars now find this view hard to support from the sources. The ancient Christian historian Sozomen () is the only ancient source that shows Ambrose and Gratian together in any personal interaction. In that interaction, Sozomen relates that, in the last year of Gratian's reign, Ambrose intruded on Gratian's private hunting party in order to appeal on behalf of a pagan senator sentenced to die. After years of acquaintance, according to professor Neil B. McLynn, this indicates that Ambrose could not take for granted that Gratian would see him, so instead, Ambrose had to resort to such manoeuvrings to make his appeal.
Gratian was personally devout long before meeting Ambrose. Modern scholarship indicates Gratian's religious policies do not evidence capitulation to Ambrose more than they evidence Gratian's own views. Gratian's devotion did lead Ambrose to write a large number of books and letters of theology and spiritual commentary dedicated to the emperor. The sheer volume of these writings and the effusive praise they contain has led many historians to conclude that Gratian was dominated by Ambrose, and it was that dominance that produced Gratian's anti-pagan actions. McLynn asserts that effusive praises were common in everyone's correspondence with the crown. He adds that Gratian's actions were determined by the constraints of the system as much as "by his own initiatives or Ambrose's influence".
McLynn asserts that the largest influence on Gratian's policy was the profound change in political circumstances produced by the Battle of Adrianople in 378. Gratian had become involved in fighting the Goths the previous year and had been on his way to the Balkans when his uncle and the "cream of the eastern army" were destroyed at Adrianople. Gratian withdrew to Sirmium and set up his court there. Several rival groups, including the Arians, sought to secure benefits from the government at Sirmium. In an Arian attempt to undermine Ambrose, whom Gratian had not yet met, Gratian was "warned" that Ambrose's faith was suspect. Gratian took steps to investigate by writing to Ambrose and asking him to explain his faith.
Ambrose and Gratian first met, after this, in 379 during a visit to Milan. The bishop made a good impression on Gratian and his court, which was pervasively Christian and aristocratic – much like Ambrose himself. The emperor returned to Milan in 380 to find that Ambrose had complied with his request for a statement of his faith – in two volumes – known as "De Fide": a statement of orthodoxy and of Ambrose' political theology, as well as a polemic against the Arian heresy – intended for public discussion. The emperor had not asked to be instructed by Ambrose, and in "De Fide" Ambrose states this clearly. Nor was he asked to refute the Arians. He was asked to justify his own position, but in the end, he did all three.
It seems that by 382 Ambrose had replaced Ausonius to become a major influence in Gratian's court. Ambrose had not yet become the "conscience" of kings he would in the later 380s, but he did speak out against reinstating the Altar of Victory. In 382, Gratian was the first to divert public financial subsidies that had previously supported Rome's cults. Before that year, contributions in support of the ancient customs had continued unchallenged by the state.
Valentinian II.
The childless Gratian had treated his younger brother Valentinian II like a son. Ambrose, on the other hand, had incurred the lasting enmity of Valentinian II's mother, the Empress Justina, in the winter of 379 by helping to appoint a Nicene bishop in Sirmium. Not long after this, Valentinian II, his mother, and the court left Sirmium; Sirmium had come under Theodosius' control, so they went to Milan which was ruled by Gratian.
In 383 Gratian was assassinated at Lyon, in Gaul (France) by Magnus Maximus. Valentinian II was twelve years old, and the assassination left his mother, Justina, in a position of something akin to a regent. In 385 (or 386) the emperor Valentinian II and his mother Justina, along with a considerable number of clergy, the laity, and the military, professed Arianism. Conflict between Ambrose and Justina soon followed.
The Arians demanded that Valentinian II allocate to them two churches in Milan: one in the city (the Basilica of the Apostles), the other in the suburbs (St Victor's). Ambrose refused to surrender the churches. He answered by saying that "What belongs to God, is outside the emperor's power." In this, Ambrose called on an ancient Roman principle: a temple set apart to a god became the property of that god. Ambrose now applied this ancient legal principle to the Christian churches, seeing the bishop, as a divine representative, as guardian of his god's property.
Subsequently, while Ambrose was performing the Liturgy of the Hours in the basilica, the prefect of the city came to persuade him to give it up to the Arians. Ambrose again refused. Certain deans (officers of the court) were sent to take possession of the basilica by hanging upon it imperial escutcheons. Instead, soldiers from the ranks the emperor had placed around the basilica began pouring into the church, assuring Ambrose of their fidelity. The escutcheons outside the church were removed, and legend says the children tore them to shreds.
Ambrose refused to surrender the basilica, and sent sharp answers back to his emperor: "If you demand my person, I am ready to submit: carry me to prison or to death, I will not resist; but I will never betray the church of Christ. I will not call upon the people to succour me; I will die at the foot of the altar rather than desert it. The tumult of the people I will not encourage: but God alone can appease it." By Thursday, the emperor gave in, bitterly responding: "Soon, if Ambrose gives the orders, you will be sending me to him in chains."
In 386, Justina and Valentinian II received the Arian bishop Auxentius the younger, and Ambrose was again ordered to hand over a church in Milan for Arian usage. Ambrose and his congregation barricaded themselves inside the church, and again the imperial order was rescinded. There was an attempted kidnapping, and another attempt to arrest him and to force him to leave the city. Several accusations were made, but unlike in the case of John Chrysostom, no formal charges were brought. The emperor certainly had the power to do so, and probably did not solely because of Ambrose's popularity with the people and what they might do.
When Magnus Maximus usurped power in Gaul (383) and was considering a descent upon Italy, Valentinian II sent Ambrose to dissuade him, and the embassy was successful (384). A second, later embassy was unsuccessful. Magnus Maximus entered Italy (386–387) and Milan was taken. Justina and her son fled, but Ambrose remained and had the plate of the church melted for the relief of the poor.
Magnus Maximus's entry into Italy and the emperor's flight to the east left his coemperor Theodosius little choice but to reply in force. After defeating the usurper at Aquileia in 388, Theodosius returned with the restored emperor to Milan, where he likely met Ambrose for the first time. As Valentinian II was only seventeen years old, Theodosius remained in Italy for a time to ensure the western half of the empire was stable. He appointed his trusted Frankish general, Arbogast, as "magister militum". Tensions between Arbogast and Valentinian II quickly escalated until Valentinian II was found hanged in his bedchamber by apparent suicide. Because the young emperor had recently been in a public confrontation with Arbogast, contemporary sources and historians have been unable to definitively determine whether Valentinian II's death was suicide or murder.
Ambrose performed the funeral for Valentinian II and his eulogy is the only contemporary Western source for Valentinian II's death. The eulogy makes reference to the heavy yoke of duties the emperor carried and the ignorance of youth, in which God might find forgiveness for sins. While never directly touching on the possibility of suicide, such themes may have been intended to comfort his Christian audience, for whom suicide was a sin.
Theodosius.
While Ambrose was writing "De Fide", Theodosius published his own statement of faith in 381 in an edict establishing Nicene Christianity as the only legitimate version of the Christian faith. There is unanimity amongst scholars that this represents the emperor's own beliefs. The aftermath of the death (378) of Valens (Emperor in the East from 364 to 378) had left many questions for the church unresolved, and Theodosius' edict can be seen as an effort to begin addressing those questions. Theodosius' natural generosity was tempered by his pressing need to establish himself and to publicly assert his personal piety.
On 28 February 380, Theodosius issued the Edict of Thessalonica, a decree addressed to the city of Constantinople, determining that only Christians who did not support Arian views were catholic and could have their places of worship officially recognized as "churches". The Edict opposed Arianism, and attempted to establish unity in Christianity and to suppress heresy. German ancient historian writes that the Edict of Thessalonica was neither anti-pagan nor antisemitic; it did not declare Christianity to be the official religion of the empire; and it gave no advantage to Christians over other faiths.
Liebeschuetz and Hill indicate that it was not until after 388, during Theodosius' stay in Milan following the defeat of Maximus in 388, that Theodosius and Ambrose first met.
After the Massacre of Thessalonica in 390, Theodosius made an act of public penance at Ambrose's behest. Ambrose was away from court during the events at Thessalonica, but after being informed of them, he wrote Theodosius a letter. In that still-existing letter, Ambrose presses for a semi-public demonstration of penitence from the emperor, telling him that, as his bishop, he will not give Theodosius communion until it is done. Wolf Liebeschuetz says "Theodosius duly complied and came to church without his imperial robes, until Christmas, when Ambrose openly admitted him to communion".
Formerly, some scholars credited Ambrose with having an undue influence over Emperor Theodosius I, from this period forward, prompting him toward major anti-pagan legislation beginning in February of 391. However, this interpretation has been heavily disputed since the late-twentieth century. McLynn argues that Theodosius's anti-pagan legislation was too limited in scope for it to be of interest to the bishop. The fabled encounter at the door of the cathedral in Milan, with Ambrose as the mitred prelate braced, blocking Theodosius from entering, which has sometimes been seen as evidence of Ambrose' dominance over Theodosius, has been debunked by modern historians as "a pious fiction". There was no encounter at the church door. The story is a product of the imagination of Theodoret, a historian of the fifth century who wrote of the events of 390 "using his own ideology to fill the gaps in the historical record".
The twenty-first-century view is that Ambrose was "not a power behind the throne". The two men did not meet each other frequently, and documents that reveal the relationship between the two are less about personal friendship than they are about negotiations between two formidable leaders of the powerful institutions they represent: the Roman State and the Italian Church. Cameron says there is no evidence that Ambrose was a significant influence on the emperor.
For centuries after his death, Theodosius was regarded as a champion of Christian orthodoxy who decisively stamped out paganism. This view was recorded by Theodoret, who is recognized as an unreliable historian, in the century following their deaths. Theodosius's predecessors Constantine (), Constantius (), and Valens had all been semi-Arians. Therefore, it fell to the orthodox Theodosius to receive from Christian literary tradition most of the credit for the final triumph of Christianity. Modern scholars see this as an interpretation of history by orthodox Christian writers more than as a representation of actual history. The view of a pious Theodosius submitting meekly to the authority of the church, represented by Ambrose, is part of the myth that evolved within a generation of their deaths.
Later years and death.
In April 393 Arbogast ("magister militum" of the West) and his puppet Emperor Eugenius marched into Italy to consolidate their position against Theodosius I and his son, Honorius, now appointed Augustus to govern the western portion of the empire. Arbogast and Eugenius courted Ambrose's support by very obliging letters; but before they arrived at Milan, he had retired to Bologna, where he assisted at the translation of the relics of Saints Vitalis and Agricola. From there he went to Florence, where he remained until Eugenius withdrew from Milan to meet Theodosius in the Battle of the Frigidus in early September 394.
Soon after acquiring the undisputed possession of the Roman Empire, Theodosius died at Milan in 395, and Ambrose gave the eulogy. Two years later (4 April 397) Ambrose also died. He was succeeded as bishop of Milan by Simplician. Ambrose's body may still be viewed in the church of Saint Ambrogio in Milan, where it has been continuously venerated – along with the bodies identified in his time as being those of Saints Gervase and Protase.
Ambrose is remembered in the calendar of the Roman Rite of the Catholic Church on 7 December, and is also honoured in the Church of England and in the Episcopal Church on 7 December.
Character.
In 1994, Neil B. McLynn wrote a complex study of Ambrose that focused on his politics and was intended to "demonstrate that Ambrose viewed community as a means to acquire personal political power". Subsequent studies of how Ambrose handled his episcopal responsibilities, his Nicene theology and his dealings with the Arians in his episcopate, his pastoral care, his commitment to community, and his personal asceticism, have mitigated this view.
All of Ambrose's writings are works of advocacy for Nicene Christianity, and even his political views and actions were closely related to his religion. He was rarely, if ever, concerned about simply recording what had happened; he did not write to reveal his inner thoughts and struggles; he wrote to advocate for his God. Boniface Ramsey writes that it is difficult "not to posit a deep spirituality in a man" who wrote on the mystical meanings of the "Song of Songs" and wrote many extraordinary hymns. Despite an abiding spirituality, Ambrose had a generally straightforward manner, and a practical rather than a speculative tendency in his thinking. "De Officiis" is a utilitarian guide for his clergy in their daily ministry in the Milanese church rather than "an intellectual "tour de force"".
Christian faith in the third century developed the monastic lifestyle which subsequently spread into the rest of Roman society in a general practice of virginity, voluntary poverty and self-denial for religious reasons. This lifestyle was embraced by many new converts, including Ambrose, even though they did not become actual monks.
The bishops of this era had heavy administrative responsibilities, and Ambrose was also sometimes occupied with imperial affairs, but he still fulfilled his primary responsibility to care for the well-being of his flock. He preached and celebrated the Eucharist multiple times a week, sometimes daily, and dealt directly with the needs of the poor, as well as widows and orphans, "virgins" (nuns), and his own clergy. He replied to letters personally, practised hospitality, and made himself available to the people.
Ambrose had the ability to maintain good relationships with all kinds of people. Local church practices varied quite a bit from place to place at this time, and as the bishop, Ambrose could have required that everyone adapt to his way of doing things. It was his place to keep the churches as united as possible in both ritual and belief. Instead, he respected local customs, adapting himself to whatever practices prevailed, instructing his mother to do the same. As bishop, Ambrose undertook many different labours in an effort to unite people and "provide some stability during a period of religious, political, military, and social upheavals and transformations".
Brown says Ambrose "had the makings of a faction fighter". While he got along well with most people, Ambrose was not averse to conflict and even opposed emperors with a fearlessness born of self-confidence and a clear conscience and not from any belief he would not suffer for his decisions. Having begun his life as a Roman aristocrat and a governor, it is clear that Ambrose retained the attitudes and practices of Roman governance even after becoming a bishop.
His acts and writings show he was quite clear about the limits of imperial power over the church's internal affairs including doctrine, moral teaching, and governance. He wrote to Valentinian: "In matters of faith bishops are the judges of Christian emperors, not emperors of bishops." ("Epistle" 21.4). He also famously said to an Arian bishop chosen by the emperor, "The emperor is in the church, not over the church." ("Sermon Against Auxentius", 36). Ambrose's acts and writings "created a sort of model which was to remain valid in the Latin West for the relations of the Church and the Christian State. Both powers stood in a basically positive relationship to each other, but the innermost sphere of the Church's life--faith, the moral order, ecclesiastical discipline--remained withdrawn from the State's influence."
Ambrose was also well aware of the limits of his power. At the height of his career as a venerable, respected and well-loved bishop in 396, imperial agents marched into his church, pushing past him and his clergy who had crowded the altar to protect a political suspect from arrest, and dragged the man from the church in front of Ambrose who could do nothing to stop them. "When it came to the central functions of the Roman state, even the vivid Ambrose was a lightweight".
Attitude towards Jews.
Ambrose is recorded on occasions as taking a hostile attitude towards Jews, for example in 388, when the Emperor Theodosius I was informed that a crowd of Christians had retaliated against the local Jewish community by destroying the synagogue at Callinicum on the Euphrates. The synagogue most probably existed within the fortified town to serve the soldiers stationed there, and Theodosius ordered that the offenders be punished and that the synagogue be rebuilt at the expense of the bishop. Ambrose wrote to the emperor arguing against this, basing his argument on two assertions: first, if the bishop obeyed the order, it would be a betrayal of his faith, and second, if the bishop instead refused to obey the order, he would become a martyr and create a scandal embarrassing the emperor. Ambrose, referring to a prior incident where Magnus Maximus issued an edict censuring Christians in Rome for burning down a Jewish synagogue, warned Theodosius that the people, in turn, exclaimed "the emperor has become a Jew", implying that Theodosius would receive the same lack of support from the people. Theodosius rescinded the order concerning the bishop.
That was not enough for Ambrose, however, and when Theodosius next visited Milan Ambrose confronted him directly in an effort to get him to drop the entire case. McLynn argues that Ambrose failed to win the emperor's sympathy and was mostly excluded from his counsels thereafter. The Callinicum affair was not an isolated incident. Generally speaking, however, while McLynn says it makes Ambrose look like a bully and a bigot to modern eyes, scholars also agree that Ambrose's attitudes toward the Jews cannot be fairly summarized in one sentence, as not all of Ambrose's attitudes toward Jews were negative.
For example, Ambrose makes extensive and appreciative use of the works of a Jew, Philo of Alexandria, in his own writings, treating Philo as one of the "faithful interpreters of the Scriptures". Philo was an educated man of some standing and a prolific writer during the era of Second Temple Judaism. Forty–three of his treatises have been preserved, and these by Christians, rather than Jews. Philo became foundational in forming the Christian literary view on the six days of creation through Basil's "Hexaemeron". Eusebius, the Cappadocian Fathers, and Didymus the Blind appropriated material from Philo as well, but none did so more than Ambrose. As a result of these extensive references, Philo was accepted into the Christian tradition as an honorary Church Father. "In fact, one Byzantine catena even refers to him as 'Bishop Philo'. This high regard for Philo even led to a number of legends of his conversion to Christianity, although this assertion stands on very dubious evidence". Ambrose also used Josephus, Maccabees, and other Jewish sources for his writings. He praises some individual Jews. Ambrose tended to write negatively of all non-Nicenes as if they were all in one category. This served a rhetorical purpose in his writing and should be considered accordingly.
Attitude towards pagans.
Modern scholarship indicates that paganism was a lesser concern than heresy for Christians in the fourth and fifth centuries, including Ambrose, but it was still a concern. Writings of this period were commonly hostile and often contemptuous toward paganism which Christianity saw as already defeated in Heaven. The great Christian writers of the third to fifth centuries attempted to discredit the continuation of these "defeated practices" by searching pagan writings, "particularly those of Varro, for everything that could be regarded by Christian standards as repulsive and irreligious." Ambrose' work reflects this triumphalism.
Throughout his time in the episcopate, Ambrose was active in his opposition to any state sponsorship of pagan cults. When Gratian ordered the Altar of Victory to be removed, it roused the aristocracy of Rome to send a delegation to the emperor to appeal against the decision, but Pope Damasus I induced Christian senators to petition against it, and Ambrose blocked the delegates from obtaining an audience with the emperor. Under Valentinian II, an effort was made to restore the Altar of Victory to its ancient station in the hall of the Roman Senate and to again provide support for the seven Vestal Virgins. The pagan party was led by the refined senator Quintus Aurelius Symmachus, who used all his prodigious skill and artistry to create a marvellous document full of the "maiestas populi Romani". Hans Lietzmann writes that "Pagans and Christians alike were stirred by the solemn earnestness of an admonition which called all men of goodwill to the aid of a glorious history, to render all worthy honour to a world that was fading away".
Then Ambrose wrote to Valentinian asserting that the emperor was a soldier of God – not simply a personal believer, but one bound by his position to serve the faith; under no circumstances could he agree to something that would promote the worship of idols. Ambrose held up the example of Valentinian's brother, Gratian, reminding Valentinian that the commandment of God must take precedence. The bishop's intervention led to the failure of Symmachus' appeal.
In 389, Ambrose stepped in against a pagan senatorial delegation who wished to see the emperor Theodosius I. Although Theodosius refused their requests, he was irritated at the bishop's presumption and refused to see him for several days. Later, Ambrose wrote a letter to the emperor Eugenius complaining that some gifts the latter had bestowed on pagan senators could be used for funding pagan cults.
Theology.
Ambrose joins Augustine, Jerome, and Gregory the Great as one of the Latin Doctors of the Church. Theologians compare him with Hilary, who they claim fell short of Ambrose's administrative excellence but demonstrated greater theological ability. He succeeded as a theologian despite his juridical training and his comparatively late handling of biblical and doctrinal subjects.
Ambrose's intense episcopal consciousness furthered the growing doctrine of the Church and its sacerdotal ministry including teaching, leading services, administering sacraments, and giving pastoral advice. He found a proper balance between offering sacraments as mysterious ways of encountering God and sacramentalism, the emphasis on ritual for ritual's sake, prevalent elsewhere. He engaged the prevalent asceticism of the day, continuing the Stoic and Ciceronian training of his youth, which enabled him to promulgate a lofty standard of Christian ethics. Thus we have the "De officiis ministrorum", "De viduis", "De virginitate" and "De paenitentia".
Ambrose displayed a kind of liturgical flexibility that kept in mind that liturgy was a tool to serve people in worshiping God, and ought not to become a rigid entity that is invariable from place to place. His advice to Augustine of Hippo on this point was to follow local liturgical custom. "When I am at Rome, I fast on a Saturday; when I am at Milan, I do not. Follow the custom of the church where you are." Thus Ambrose refused to be drawn into a false conflict over which particular local church had the "right" liturgical form where there was no substantial problem. His advice has remained in the English language as the saying, "When in Rome, do as the Romans do."
Eschatology.
Some scholars argue that Ambrose was a Christian universalist. It has been noted that Ambrose's theology was significantly influenced by that of Origen and Didymus the Blind, two other early Christian universalists. One quotation cited in favour of this belief is:
One could interpret this passage as being another example of the Christian belief in a general resurrection (that both those in Heaven and in Hell undergo a bodily resurrection), or an allusion to purgatory (that some destined for Heaven must first undergo a phase of purification). Some other works by Ambrose could potentially be seen as teaching the mainstream view of salvation. For example:
This could be interpreted as something which is not eschatological but rather rhetorical or conditional on the state of repentance. The passage most often cited in support of Ambrose supposed belief in apokatastasis is his commentary on 1 Corinthians 15, it reads:
Other scholars interpret Ambrose's soteriology to be in agreement with Jerome of Stridon and the anonymous individuals whom Augustine criticized in his treatise "on faith and works", who argued that while the unbelievers would experience eternal judgement, all Christians who have believed in Jesus will be reunited to God at some point, even if they have sinned and fallen away.
Giving to the poor.
In "De Officiis", the most influential of his surviving works, and one of the most important texts of patristic literature, he reveals his views connecting justice and generosity by asserting these practices are of mutual benefit to the participants. Ambrose draws heavily on Cicero and the biblical book of Genesis for this concept of mutual inter-dependence in society. In the bishop's view, it is concern for one another's interests that binds society together. Ambrose asserts that avarice leads to a breakdown in this mutuality, therefore avarice leads to a breakdown in society itself. In the late 380s, the bishop took the lead in opposing the greed of the elite landowners in Milan by starting a series of pointed sermons directed at his wealthy constituents on the need for the rich to care for the poor.
Some scholars have suggested Ambrose's endeavours to lead his people as both a Roman and a Christian caused him to strive for what a modern context would describe as a type of communism or socialism. He was not just interested in the church but was also interested in the condition of contemporary Italian society. Ambrose considered the poor not a distinct group of outsiders, but a part of a united people to be stood with in solidarity. Giving to the poor was not to be considered an act of generosity towards the fringes of society but a repayment of resources that God had originally bestowed on everyone equally and that the rich had usurped. He defines justice as providing for the poor whom he describes as our "brothers and sisters" because they "share our common humanity".
Mariology.
The theological treatises of Ambrose of Milan would come to influence Popes Damasus, Siricius and Leo XIII. Central to Ambrose is the virginity of Mary and her role as Mother of God.
Ambrose viewed celibacy as superior to marriage and saw Mary as the model of virginity.
Augustine.
Ambrose studied theology with Simplician, a presbyter of Rome. Using his excellent knowledge of Greek, which was then rare in the West, Ambrose studied the Old Testament and Greek authors like Philo, Origen, Athanasius, and Basil of Caesarea, with whom he was also exchanging letters. Ambrose became a famous rhetorician whom Augustine came to hear speak. Augustine wrote in his "Confessions" that Faustus, the Manichean rhetorician, was a more impressive speaker, but the content of Ambrose's sermons began to affect Augustine's faith. Augustine sought guidance from Ambrose and again records in his "Confessions" that Ambrose was too busy to answer his questions. In a passage of Augustine's "Confessions" in which Augustine wonders why he could not share his burden with Ambrose, he comments: "Ambrose himself I esteemed a happy man, as the world counted happiness, because great personages held him in honour. Only his celibacy appeared to me a painful burden." Simplician regularly met with Augustine, however, and Augustine writes of Simplician's "fatherly affection" for him. It was Simplician who introduced Augustine to Christian Neoplatonism. It is commonly understood in the Christian tradition that Ambrose baptized Augustine.
In this same passage of Augustine's "Confessions" is an anecdote which bears on the history of reading:
This is a celebrated passage in modern scholarly discussion. The practice of reading to oneself without vocalizing the text was less common in antiquity than it has since become. In a culture that set a high value on oratory and public performances of all kinds, in which the production of books was very labour-intensive, the majority of the population was illiterate, and where those with the leisure to enjoy literary works also had slaves to read for them, written texts were more likely to be seen as scripts for recitation than as vehicles of silent reflection. However, there is also evidence that silent reading did occur in antiquity and that it was not generally regarded as unusual.
Music.
Ambrose's writings extend past literature and into music, where he was an important innovator in early Christian hymnography. His contributions include the "successful invention of Christian Latin hymnody", while the hymnologist Guido Maria Dreves designated him to be "The Father of church hymnody". He was not the first to write Latin hymns; the Bishop Hilary of Poitiers had done so a few decades before. However, the hymns of Hilary are thought to have been largely inaccessible because of their complexity and length. Only fragments of hymns from Hilary's "Liber hymnorum" exist, making those of Ambrose the earliest extant complete Latin hymns. The assembling of Ambrose's surviving "oeuvre" remains controversial; the almost immediate popularity of his style quickly prompted imitations, some which may even date from his lifetime. There are four hymns for which Ambrose's authorship is universally accepted, as they are attributed to him by Augustine:
Each of these hymns has eight four-line stanzas and is written in strict iambic tetrameter (that is 4 × 2 syllables, each iamb being two syllables). Marked by dignified simplicity, they served as a fruitful model for later times. Scholars such as the theologian Brian P. Dunkle have argued for the authenticity of as many as thirteen other hymns, while the musicologist James McKinnon contends that further attributions could include "perhaps some ten others". Ambrose is traditionally credited but not actually known to have composed any of the repertory of Ambrosian chant also known simply as "antiphonal chant", a method of chanting where one side of the choir alternately responds to the other. Although Ambrosian chant was named in his honour, no Ambrosian-chant melodies can be attributed to Ambrose. With Augustine, Ambrose was traditionally credited with composing the hymn "Te Deum". Since the hymnologist Guido Maria Dreves in 1893, however, scholars have dismissed this attribution.
Writings.
Source: All works are originally in Latin. Following each is where it may be found in a standard compilation of Ambrose's writings. His first work was probably "De paradiso" (377–378). Most have approximate dates, and works such as "De Helia et ieiunio" (377–391), "Expositio evangelii secundum Lucam" (377–389) and "De officiis ministrorum" (377–391) have been given a wide variety of datings by scholars. His best known work is probably "De officiis ministrorum" (377–391), while the (386–390) and "De obitu Theodosii" (395) are among his most noted works. In matters of exegesis he is, like Hilary, an Alexandrian. In dogma he follows Basil of Caesarea and other Greek authors, but nevertheless gives a distinctly Western cast to the speculations of which he treats. This is particularly manifest in the weightier emphasis which he lays upon human sin and divine grace, and in the place which he assigns to faith in the individual Christian life. There has been debate on the attribution of some writings: for example "De mysteriis" is usually attributed to Ambrose, while the related "De sacramentis" is written in a different style with some silent disagreements, so there is less consensus over its author. This latter work was occasionally identified as being by St. Augustine, though this is erroneous.
Editions.
The history of the editions of St. Ambrose's works spans several centuries. Erasmus published them in four volumes in Basel in 1527. A significant Roman edition, the result of many years of labor, appeared in 1580 in five volumes, initiated by Sixtus V when he was still the monk Felice Peretti. This edition includes a biography of St. Ambrose by Baronius, originally written to be part of his "Annales Ecclesiastici". The notable Maurist edition, edited by Jacques Du Frische and Denis-Nicolas Le Nourry, was published in Paris between 1686 and 1690 in two folio volumes and was later reprinted in Venice in 1748–51 and 1781–82. The most recent edition, by Paolo Angelo Ballerini, was published in Milan in 1878 in six folio volumes.
English.
Several of Ambrose's works have recently been published in the bilingual Latin-German "Fontes Christiani" series (currently edited by Brepols).
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Ambracia
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Ambracia (; , occasionally , "Ampracia") was a city of ancient Greece on the site of modern Arta. It was founded by the Corinthians in 625 BC and was situated about from the Ambracian Gulf, on a bend of the navigable river Arachthos (or Aratthus), in the midst of a fertile wooded plain.
Name.
It was named after Ambracia, who according to some myths was Augeas daughter, while others describe her as Apollo's granddaughter and the daughter of Melaneus, king of the Dryope.
According to a different story, the town was named after Ambrax, Thesprotus son and Lycaon's grandson.
History.
Ambracia was founded between 650 and 625 BC by Gorgus, son of the Corinthian tyrant Cypselus, at which time its economy was based on farmlands, fishing, timber for shipbuilding, and the exportation of the produce of Epirus. After the expulsion of Gorgus's son Periander its government developed into a strong democracy. The early policy of Ambracia was determined by its loyalty to Corinth (for which it probably served as an entrepot in the Epirus trade), and its consequent aversion to Corcyra (as Ambracia participated on the Corinthian side at the Battle of Sybota, which took place in 433 BC between the rebellious Corinthian colony of Corcyra (modern Corfu) and Corinth).
Ambraciot politics featured many frontier disputes with the Amphilochians and Acarnanians. Hence it took a prominent part in the Peloponnesian War until the crushing defeat at Idomene (426), which crippled its resources.
In the 4th century BC, it continued its traditional policy but in 338 was besieged by Philip II of Macedon. With the assistance of Corinth and Athens, it escaped complete domination at Philip's hands but was nevertheless forced to accept a Macedonian garrison. In 294 BC, after forty-three years of semi-autonomy under Macedonian suzerainty, Ambracia was given by the son of Cassander to Pyrrhus, king of Epirus, who made it his capital and adorned it with palaces, temples, and theatres. In the wars of Philip V of Macedon and the Epirotes against the Aetolian League (220–205), Ambracia passed from one alliance to the other but ultimately joined the latter confederacy. During the struggle of the Aetolians against Rome, it withstood a stubborn siege, including the first known use of poison gas against the Romans' siege tunnels. There was an ancient book, titled "Ambrakika" (Ἀμβρακικά), by the writer Athanadas, that detailed the history of Ambracia. No copies of the work survive, but it was referred to by later writers such as Antoninus Liberalis as an authority on the subject.
Ambracia was captured and plundered by Marcus Fulvius Nobilior in 189 BC, after which it was declared by Rome a "free city" and gradually fell into insignificance. The foundation by Augustus of Nicopolis, into which the remaining inhabitants were drafted, left the site desolate. In Byzantine times a new settlement took its place under the name of Arta. Some fragmentary walls of large, well-dressed blocks near this latter town indicate the early prosperity of Ambracia.
References.
Attribution:
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Amber
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Amber is fossilized tree resin. Examples of it have been appreciated for its color and natural beauty since the Neolithic times, and worked as a gemstone since antiquity. Amber is used in jewelry and as a healing agent in folk medicine.
There are five classes of amber, defined on the basis of their chemical constituents. Because it originates as a soft, sticky tree resin, amber sometimes contains animal and plant material as inclusions. Amber occurring in coal seams is also called resinite, and the term "ambrite" is applied to that found specifically within New Zealand coal seams.
Etymology.
The English word "amber" derives from Arabic from Middle Persian 𐭠𐭭𐭡𐭫 ("ʾnbl" /ambar/, “ambergris”) via Middle Latin "ambar" and Middle French "ambre". The word referred to what is now known as "ambergris" ("ambre gris" or "gray amber"), a solid waxy substance derived from the sperm whale. The word, in its sense of "ambergris," was adopted in Middle English in the 14th century.
In the Romance languages, the sense of the word was extended to Baltic amber (fossil resin) from as early as the late 13th century. At first called white or yellow amber ("ambre jaune"), this meaning was adopted in English by the early 15th century. As the use of ambergris waned, this became the main sense of the word.
The two substances ("yellow amber" and "gray amber") conceivably became associated or confused because they both were found washed up on beaches. Ambergris is less dense than water and floats, whereas amber is denser and floats only in concentrated saline, or strong salty seawater though less dense than stone.
The classical names for amber, Ancient Greek ("ēlektron") and one of its Latin names, "electrum," are connected to a term ἠλέκτωρ ("ēlektōr") meaning "beaming Sun". According to myth, when Phaëton, son of Helios (the Sun) was killed, his mourning sisters became poplar trees, and their tears became "elektron", amber. The word "elektron" gave rise to the words "electric, electricity", and their relatives because of amber's ability to bear a charge of static electricity.
Varietal names.
A number of regional and varietal names have been applied to ambers over the centuries, including allingite, beckerite, gedanite, kochenite, krantzite, and stantienite.
History.
Theophrastus discussed amber in the 4th century BCE, as did Pytheas (), whose work "On the Ocean" is lost, but was referenced by Pliny, according to whose "Natural History":Pytheas says that the Gutones, a people of Germany, inhabit the shores of an estuary of the Ocean called Mentonomon, their territory extending a distance of six thousand stadia; that, at one day's sail from this territory, is the Isle of Abalus, upon the shores of which, amber is thrown up by the waves in spring, it being an excretion of the sea in a concrete form; as, also, that the inhabitants use this amber by way of fuel, and sell it to their neighbors, the Teutones.
Earlier Pliny says that Pytheas refers to a large island—three days' sail from the Scythian coast and called Balcia by Xenophon of Lampsacus (author of a fanciful travel book in Greek)—as "Basilia"—a name generally equated with "Abalus". Given the presence of amber, the island could have been Heligoland, Zealand, the shores of Gdańsk Bay, the Sambia Peninsula or the Curonian Lagoon, which were historically the richest sources of amber in northern Europe. There were well-established trade routes for amber connecting the Baltic with the Mediterranean (known as the "Amber Road"). Pliny states explicitly that the Germans exported amber to Pannonia, from where the Veneti distributed it onwards.
The ancient Italic peoples of southern Italy used to work amber; the National Archaeological Museum of Siritide (Museo Archeologico Nazionale della Siritide) at Policoro in the province of Matera (Basilicata) displays important surviving examples. It has been suggested that amber used in antiquity, as at Mycenae and in the prehistory of the Mediterranean, came from deposits in Sicily.
Pliny also cites the opinion of Nicias ( 470–413 BCE), according to whom amber Besides the fanciful explanations according to which amber is "produced by the Sun", Pliny cites opinions that are well aware of its origin in tree resin, citing the native Latin name of "succinum" ("sūcinum", from "sucus" "juice"). In Book 37, section XI of "Natural History", Pliny wrote:
He also states that amber is also found in Egypt and India, and he even refers to the electrostatic properties of amber, by saying that "in Syria the women make the whorls of their spindles of this substance, and give it the name of "harpax" [from ἁρπάζω, "to drag"] from the circumstance that it attracts leaves towards it, chaff, and the light fringe of tissues".
The Romans traded for amber from the shores of the southern Baltic at least as far back as the time of Nero.
Amber has a long history of use in China, with the first written record from 200 BCE. Early in the 19th century, the first reports of amber found in North America came from discoveries in New Jersey along Crosswicks Creek near Trenton, at Camden, and near Woodbury.
Composition.
Amber is heterogeneous in composition, but consists of several resinous more or less soluble in alcohol, ether and chloroform, associated with an insoluble bituminous substance. Amber is a macromolecule formed by free radical polymerization of several precursors in the labdane family, for example, communic acid, communol, and biformene. These labdanes are diterpenes (C20H32) and trienes, equipping the organic skeleton with three alkene groups for polymerization. As amber matures over the years, more polymerization takes place as well as isomerization reactions, crosslinking and cyclization.
Most amber has a hardness between 2.0 and 2.5 on the Mohs scale, a refractive index of 1.5–1.6, a specific gravity between 1.06 and 1.10, and a melting point of 250–300 °C. Heated above , amber decomposes, yielding an oil of amber, and leaves a black residue which is known as "amber colophony", or "amber pitch"; when dissolved in oil of turpentine or in linseed oil this forms "amber varnish" or "amber lac".
Impurities are quite often present, especially when the resin has dropped onto the ground, so the material may be useless except for varnish-making. Such impure amber is called "firniss". Such inclusion of other substances can cause the amber to have an unexpected color. Pyrites may give a bluish color. "Bony amber" owes its cloudy opacity to numerous tiny bubbles inside the resin. However, so-called "black amber" is really a kind of jet. In darkly clouded and even opaque amber, inclusions can be imaged using high-energy, high-contrast, high-resolution X-rays.
Formation.
Molecular polymerization, resulting from high pressures and temperatures produced by overlying sediment, transforms the resin first into copal. Sustained heat and pressure drives off terpenes and results in the formation of amber. For this to happen, the resin must be resistant to decay. Many trees produce resin, but in the majority of cases this deposit is broken down by physical and biological processes. Exposure to sunlight, rain, microorganisms, and extreme temperatures tends to disintegrate the resin. For the resin to survive long enough to become amber, it must be resistant to such forces or be produced under conditions that exclude them. Fossil resins from Europe fall into two categories, the Baltic ambers and another that resembles the "Agathis" group. Fossil resins from the Americas and Africa are closely related to the modern genus "Hymenaea", while Baltic ambers are thought to be fossil resins from plants of the family Sciadopityaceae that once lived in north Europe.
The abnormal development of resin in living trees ("succinosis") can result in the formation of amber.
Extraction and processing.
Distribution and mining.
Amber is globally distributed in or around all continents, mainly in rocks of Cretaceous age or younger. Historically, the coast west of Königsberg in Prussia was the world's leading source of amber. The first mentions of amber deposits there date back to the 12th century. Juodkrantė in Lithuania was established in the mid-19th century as a mining town of amber. About 90% of the world's extractable amber is still located in that area, which was transferred to the Russian Soviet Federative Socialist Republic of the USSR in 1946, becoming the Kaliningrad Oblast.
Pieces of amber torn from the seafloor are cast up by the waves and collected by hand, dredging, or diving. Elsewhere, amber is mined, both in open works and underground galleries. Then nodules of "blue earth" have to be removed and an opaque crust must be cleaned off, which can be done in revolving barrels containing sand and water. Erosion removes this crust from sea-worn amber. Dominican amber is mined through bell pitting, which is dangerous because of the risk of tunnel collapse.
An important source of amber is Kachin State in northern Myanmar, which has been a major source of amber in China for at least 1,800 years. Contemporary mining of this deposit has attracted attention for unsafe working conditions and its role in funding internal conflict in the country. Amber from the Rivne Oblast of Ukraine, referred to as Rivne amber, is mined illegally by organised crime groups, who deforest the surrounding areas and pump water into the sediments to extract the amber, causing severe environmental deterioration.
Treatment.
The Vienna amber factories, which use pale amber to manufacture pipes and other smoking tools, turn it on a lathe and polish it with whitening and water or with rotten stone and oil. The final luster is given by polishing with flannel.
When gradually heated in an oil bath, amber "becomes soft and flexible. Two pieces of amber may be united by smearing the surfaces with linseed oil, heating them, and then pressing them together while hot. Cloudy amber may be clarified in an oil bath, as the oil fills the numerous pores that cause the turbidity. Small fragments, formerly thrown away or used only for varnish are now used on a large scale in the formation of "ambroid" or "pressed amber". The pieces are carefully heated with exclusion of air and then compressed into a uniform mass by intense hydraulic pressure, the softened amber being forced through holes in a metal plate. The product is extensively used for the production of cheap jewelry and articles for smoking. This pressed amber yields brilliant interference colors in polarized light."
Amber has often been imitated by other resins like copal and kauri gum, as well as by celluloid and even glass. Baltic amber is sometimes colored artificially but also called "true amber".
Appearance.
Amber occurs in a range of different colors. As well as the usual yellow-orange-brown that is associated with the color "amber", amber can range from a whitish color through a pale lemon yellow, to brown and almost black. Other uncommon colors include red amber (sometimes known as "cherry amber"), green amber, and even blue amber, which is rare and highly sought after.
Yellow amber is a hard fossil resin from evergreen trees, and despite the name it can be translucent, yellow, orange, or brown colored. Known to the Iranians by the Pahlavi compound word kah-ruba (from "kah" "straw" plus "rubay" "attract, snatch", referring to its electrical properties), which entered Arabic as kahraba' or kahraba (which later became the Arabic word for electricity, كهرباء "kahrabā"), it too was called amber in Europe (Old French and Middle English ambre). Found along the southern shore of the Baltic Sea, yellow amber reached the Middle East and western Europe via trade. Its coastal acquisition may have been one reason yellow amber came to be designated by the same term as ambergris. Moreover, like ambergris, the resin could be burned as an incense. The resin's most popular use was, however, for ornamentation—easily cut and polished, it could be transformed into beautiful jewelry. Much of the most highly prized amber is transparent, in contrast to the very common cloudy amber and opaque amber. Opaque amber contains numerous minute bubbles. This kind of amber is known as "bony amber".
Although all Dominican amber is fluorescent, the rarest Dominican amber is blue amber. It turns blue in natural sunlight and any other partially or wholly ultraviolet light source. In long-wave UV light it has a very strong reflection, almost white. Only about is found per year, which makes it valuable and expensive.
Sometimes amber retains the form of drops and stalactites, just as it exuded from the ducts and receptacles of the injured trees. It is thought that, in addition to exuding onto the surface of the tree, amber resin also originally flowed into hollow cavities or cracks within trees, thereby leading to the development of large lumps of amber of irregular form.
Classification.
Amber can be classified into several forms. Most fundamentally, there are two types of plant resin with the potential for fossilization. Terpenoids, produced by conifers and angiosperms, consist of ring structures formed of isoprene (C5H8) units. Phenolic resins are today only produced by angiosperms, and tend to serve functional uses. The extinct medullosans produced a third type of resin, which is often found as amber within their veins. The composition of resins is highly variable; each species produces a unique blend of chemicals which can be identified by the use of pyrolysis–gas chromatography–mass spectrometry. The overall chemical and structural composition is used to divide ambers into five classes. There is also a separate classification of amber gemstones, according to the way of production.
Class I.
This class is by far the most abundant. It comprises labdatriene carboxylic acids such as communic or ozic acids. It is further split into three sub-classes. Classes Ia and Ib utilize regular labdanoid diterpenes (e.g. communic acid, communol, biformenes), while Ic uses "enantio" labdanoids (ozic acid, ozol, "enantio" biformenes).
Class Ia includes "Succinite" (= 'normal' Baltic amber) and "Glessite". They have a communic acid base, and they also include much succinic acid. Baltic amber yields on dry distillation succinic acid, the proportion varying from about 3% to 8%, and being greatest in the pale opaque or "bony" varieties. The aromatic and irritating fumes emitted by burning amber are mainly from this acid. Baltic amber is distinguished by its yield of succinic acid, hence the name "succinite". Succinite has a hardness between 2 and 3, which is greater than many other fossil resins. Its specific gravity varies from 1.05 to 1.10. It can be distinguished from other ambers via infrared spectroscopy through a specific carbonyl absorption peak. Infrared spectroscopy can detect the relative age of an amber sample. Succinic acid may not be an original component of amber but rather a degradation product of abietic acid.
Class Ib ambers are based on communic acid; however, they lack succinic acid.
Class Ic is mainly based on "enantio"-labdatrienonic acids, such as ozic and zanzibaric acids. Its most familiar representative is Dominican amber. which is mostly transparent and often contains a higher number of fossil inclusions. This has enabled the detailed reconstruction of the ecosystem of a long-vanished tropical forest. Resin from the extinct species "Hymenaea protera" is the source of Dominican amber and probably of most amber found in the tropics. It is not "succinite" but "retinite".
Class II.
These ambers are formed from resins with a sesquiterpenoid base, such as cadinene.
Class III.
These ambers are polystyrenes.
Class IV.
Class IV is something of a catch-all: its ambers are not polymerized, but mainly consist of cedrene-based sesquiterpenoids.
Class V.
Class V resins are considered to be produced by a pine or pine relative. They comprise a mixture of diterpinoid resins and "n"-alkyl compounds. Their main variety is "Highgate copalite".
Geological record.
The oldest amber recovered dates to the late Carboniferous period (). Its chemical composition makes it difficult to match the amber to its producers – it is most similar to the resins produced by flowering plants; however, the first flowering plants appeared in the Early Cretaceous, about 200 million years after the oldest amber known to date, and they were not common until the Late Cretaceous. Amber becomes abundant long after the Carboniferous, in the Early Cretaceous, when it is found in association with insects. The oldest amber with arthropod inclusions comes from the Late Triassic (late Carnian 230 Ma) of Italy, where four microscopic (0.2–0.1 mm) mites, "Triasacarus," "Ampezzoa, Minyacarus" and "Cheirolepidoptus," and a poorly preserved nematoceran fly were found in millimetre-sized droplets of amber. The oldest amber with significant numbers of arthropod inclusions comes from Lebanon. This amber, referred to as Lebanese amber, is roughly 125–135 million years old, is considered of high scientific value, providing evidence of some of the oldest sampled ecosystems.
In Lebanon, more than 450 outcrops of Lower Cretaceous amber were discovered by Dany Azar, a Lebanese paleontologist and entomologist. Among these outcrops, 20 have yielded biological inclusions comprising the oldest representatives of several recent families of terrestrial arthropods. Even older Jurassic amber has been found recently in Lebanon as well. Many remarkable insects and spiders were recently discovered in the amber of Jordan including the oldest zorapterans, clerid beetles, umenocoleid roaches, and achiliid planthoppers.
Burmese amber from the Hukawng Valley in northern Myanmar is the only commercially exploited Cretaceous amber. Uranium–lead dating of zircon crystals associated with the deposit have given an estimated depositional age of approximately 99 million years ago. Over 1,300 species have been described from the amber, with over 300 in 2019 alone.
Baltic amber is found as irregular nodules in marine glauconitic sand, known as "blue earth", occurring in Upper Eocene strata of Sambia in Prussia. It appears to have been partly derived from older Eocene deposits and it occurs also as a derivative phase in later formations, such as glacial drift. Relics of an abundant flora occur as inclusions trapped within the amber while the resin was yet fresh, suggesting relations with the flora of eastern Asia and the southern part of North America. Heinrich Göppert named the common amber-yielding pine of the Baltic forests "Pinites succiniter", but as the wood does not seem to differ from that of the existing genus it has been also called "Pinus succinifera". It is improbable that the production of amber was limited to a single species; and indeed a large number of conifers belonging to different genera are represented in the amber-flora.
Paleontological significance.
Amber is a unique preservational mode, preserving otherwise unfossilizable parts of organisms; as such it is helpful in the reconstruction of ecosystems as well as organisms; the chemical composition of the resin, however, is of limited utility in reconstructing the phylogenetic affinity of the resin producer. Amber sometimes contains animals or plant matter that became caught in the resin as it was secreted. Insects, spiders and even their webs, annelids, frogs, crustaceans, bacteria and amoebae, marine microfossils, wood, flowers and fruit, hair, feathers and other small organisms have been recovered in Cretaceous ambers (deposited c. ). There is even an ammonite "Puzosia (Bhimaites)" and marine gastropods found in Burmese amber.
The preservation of prehistoric organisms in amber forms a key plot point in Michael Crichton's 1990 novel "Jurassic Park" and the 1993 movie adaptation by Steven Spielberg. In the story, scientists are able to extract the preserved blood of dinosaurs from prehistoric mosquitoes trapped in amber, from which they genetically clone living dinosaurs. Scientifically this is as yet impossible, since no amber with fossilized mosquitoes has ever yielded preserved blood. Amber is, however, conducive to preserving DNA, since it dehydrates and thus stabilizes organisms trapped inside. One projection in 1999 estimated that DNA trapped in amber could last up to 100 million years, far beyond most estimates of around 1 million years in the most ideal conditions, although a later 2013 study was unable to extract DNA from insects trapped in much more recent Holocene copal. In 1938, 12-year-old David Attenborough (brother of Richard who played John Hammond in "Jurassic Park") was given a piece of amber containing prehistoric creatures from his adoptive sister; it would be the focus of his 2004 BBC documentary "The Amber Time Machine."
Use.
Amber has been used since prehistory (Solutrean) in the manufacture of jewelry and ornaments, and also in folk medicine.
Jewelry.
Amber has been used as jewelry since the Stone Age, from 13,000 years ago. Amber ornaments have been found in Mycenaean tombs and elsewhere across Europe. To this day it is used in the manufacture of smoking and glassblowing mouthpieces. Amber's place in culture and tradition lends it a tourism value; Palanga Amber Museum is dedicated to the fossilized resin.
Historical medicinal uses.
Amber has long been used in folk medicine for its purported healing properties. Amber and extracts were used from the time of Hippocrates in ancient Greece for a wide variety of treatments through the Middle Ages and up until the early twentieth century.
Amber necklaces are a traditional European remedy for colic or teething pain with purported analgesic properties of succinic acid, although there is no evidence that this is an effective remedy or delivery method. The American Academy of Pediatrics and the FDA have warned strongly against their use, as they present both a choking and a strangulation hazard.
Scent of amber and amber perfumery.
In ancient China, it was customary to burn amber during large festivities. If amber is heated under the right conditions, oil of amber is produced, and in past times this was combined carefully with nitric acid to create "artificial musk" – a resin with a peculiar musky odor. Although when burned, amber does give off a characteristic "pinewood" fragrance, modern products, such as perfume, do not normally use actual amber because fossilized amber produces very little scent. In perfumery, scents referred to as "amber" are often created and patented to emulate the opulent golden warmth of the fossil.
The scent of amber was originally derived from emulating the scent of ambergris and/or the plant resin labdanum, but since sperm whales are endangered, the scent of amber is now largely derived from labdanum. The term "amber" is loosely used to describe a scent that is warm, musky, rich and honey-like, and also somewhat earthy. Benzoin is usually part of the recipe. Vanilla and cloves are sometimes used to enhance the aroma. "Amber" perfumes may be created using combinations of labdanum, benzoin resin, copal (a type of tree resin used in incense manufacture), vanilla, Dammara resin and/or synthetic materials.
In Arab Muslim tradition, popular scents include amber, jasmine, musk and oud (agarwood).
Imitation substances.
Young resins used as imitations:
Plastics used as imitations:
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Amalaric
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Amalaric (; Spanish and Portuguese: "Amalarico"; 502–531) was king of the Visigoths from 522 until his assassination. He was a son of king Alaric II and his first wife Theodegotha, daughter of Theodoric the Great.
Biography.
When Alaric II was killed while fighting Clovis I, king of the Franks, in the Battle of Vouillé (507), his kingdom fell into disarray. "More serious than the destruction of the Gothic army," writes Herwig Wolfram, "than the loss of both Aquitanian provinces and the capital of Toulose, was the death of the king." Alaric had made no provision for a successor, and although he had two sons, one was of age but illegitimate and the other, Amalaric, the offspring of a legal marriage but still a child. Amalaric was carried for safety into Spain, which country and Provence were thenceforth ruled by his maternal grandfather, Theodoric the Great, acting through his vice-regent, an Ostrogothic nobleman named Theudis. The older son, Gesalec, was chosen as king but his reign was disastrous. King Theodoric of the Ostrogoths sent an army, led by his sword-bearer Theudis, against Gesalec, ostensibly on behalf of Amalaric; Gesalec fled to Africa. The Ostrogoths then drove back the Franks and their Burgundian allies, regaining possession of "the south of Novempopulana, Rodez, probably even Albi, and even Toulose". Following the 511 death of Clovis, Theodoric negotiated a peace with Clovis' successors, securing Visigothic control of the southernmost portion of Gaul for the rest of the existence of their kingdom.
In 522, the young Amalaric was proclaimed king, and four years later, on Theodoric's death, he assumed full royal power, although relinquishing Provence to his cousin Athalaric. His kingdom was faced with a Frankish threat from the north; according to Peter Heather, this was his motivation for marrying Chrotilda, the daughter of Clovis. However, this was not successful, for according to Gregory of Tours, Amalaric pressured her to forsake Orthodoxy and convert to Arian Christianity, at one point beating her until she bled; she sent to her brother Childebert I, king of Paris, a towel stained with her own blood. Ian Wood noted that although Gregory provides the fullest information for this period, where it touches Merovingian affairs, he often "allowed his religious bias to determine his interpretation of the events." Peter Heather agrees with Wood's implication in this instance: "I doubt that this is the full story, but the effects of Frankish intervention are clear enough."
Childebert defeated the Visigothic army and took Narbonne. Amalaric fled south to Barcelona, where according to Isidore of Seville, he was assassinated by his own men. According to Peter Heather, Theodoric's former governor Theudis was implicated in Amalaric's murder, "and was certainly its prime beneficiary." As for Chrotilda, in Gregory's words, she died on the journey home "by some ill chance". Childebert had her body brought to Paris where she was buried alongside her father Clovis.
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Alphorn
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The alphorn (; ; ) is a traditional lip-reed wind instrument. It consists of a very long straight wooden natural horn, with a length of , a conical bore and a wooden cup-shaped mouthpiece. Traditionally the alphorn was made in one piece from the trunk of a pine. Modern alphorns are usually made in three detachable sections for easier transport and handling, carved from blocks of spruce. The alphorn is used by rural communities in the Alps. Similar wooden horns were used for communication in most mountainous regions of Europe, from the Alps to the Carpathians.
History.
The alphorn may have developed from instruments like the , a similarly shaped Etruscan instrument of classical antiquity, although there is little documented evidence of a continuous connection between them. A 2nd century Roman mosaic, found in Boscéaz, depicts a shepherd using a similar straight horn. The use of long signal horns in mountainous areas throughout Europe and Asia may indicate a long history of cultural cross-influences regarding their construction and usage.
The first documented use of the German word is in a payment recorded in the 1527 accounts ledger of Saint Urban's Abbey in Pfaffnau. Swiss naturalist Conrad Gessner used the words for the first known detailed description of the alphorn, in his "De raris et admirandis herbis" (1555); in his time, the word "lituus" was used for several other wind instruments, like the horn, crumhorn, or cornett.
In the early 17th century, music scholar Michael Praetorius in his treatise "Syntagma Musicum" (1614–1620) depicts an alphorn-like instrument he called a ("wooden trumpet"), noting they are used by shepherds.
From the 17th to 19th century, alphorns were used in rural areas of the Alps, for signalling between high pastures across the valleys and to communities on the valley floor. The alphorn sounds can carry for several kilometres, and were even used to collect together dispersed herds. Although use by herdsmen had waned by the early 19th century, a revival of interest in the musical qualities of the instrument followed by the end of the century, and the alphorn became important in tourism, and inspired Romantic composers such as Beethoven and Gustav Mahler to add alphorn, or traditional alphorn melodies, to their pieces.
Construction and qualities.
The alphorn is carved from solid softwood, usually pine or spruce. Traditionally, the alphorn maker would find a tree growing on a slope and bent at the base providing the curved shape for the bell. The long trunk would be cut in half longways, the bore hollowed out, then glued and bound back together with outer layers of stripped bark. Modern instruments are made in several sections for more convenient handling and transport, each turned and bored from solid blocks of spruce. An integrated cup-shaped mouthpiece was traditionally carved into the narrow end, while modern instruments have a separate removable mouthpiece carved from hard wood.
An alphorn made at Rigi-Kulm, Schwyz, and now in the Victoria and Albert Museum, measures in length and has a straight tube. The Swiss alphorn varies in shape according to the locality, being curved near the bell in the Bernese Oberland.
The alphorn is a simple tube with no lateral openings or means of adjusting the pitch, so only the notes of the natural harmonic series are available. As with other natural labrosones, some of the notes do not correspond to the Western equal tempered chromatic scale, particularly the 7th and 11th partials.
Accomplished alphornists can command a range of nearly three octaves, consisting of the 2nd through the 16th partials. The availability of the higher tones is due in part to the relatively small diameter of the bore of the mouthpiece and tubing in relation to the overall length of the horn.
The well-known "Ranz des Vaches" (score; audio) is a traditional Swiss melody often heard on the alphorn. The song describes the time of bringing the cows to the high country at milk making time. Rossini introduced the "Ranz des Vaches" into his masterpiece "William Tell", along with many other melodies scattered throughout the opera in vocal and instrumental parts that are well-suited to the alphorn. Brahms wrote to Clara Schumann that the inspiration for the dramatic entry of the horn in the introduction to the last movement of his First Symphony was an alphorn melody he heard while vacationing in the Rigi area of Switzerland. For Clara's birthday in 1868 Brahms sent her a greeting that was to be sung with the melody.
Repertoire.
Among music composed for the alphorn:
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Army
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An army, ground force or land force is an armed force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or country. It may also include aviation assets by possessing an army aviation component. Within a national military force, the word army may also mean a field army.
Definition.
In some countries, such as France and China, the term "army", especially in its plural form "armies", has the broader meaning of armed forces as a whole, while retaining the colloquial sense of land forces. To differentiate the colloquial army from the formal concept of military force, the term is qualified, for example in France the land force is called , meaning Land Army, and the air and space force is called , meaning Air and Space Army. The naval force, although not using the term "army", is also included in the broad sense of the term "armies" — thus the French Navy is an integral component of the collective French Armies (French Armed Forces) under the Ministry of the Armies. A similar pattern is seen in China, with the People's Liberation Army (PLA) being the overall military, the land force being the PLA Ground Force, and so forth for the PLA Air Force, the PLA Navy, and other branches.
Though by convention, irregular military is understood in contrast to regular armies which grew slowly from personal bodyguards or elite militia. Regular in this case refers to standardized doctrines, uniforms, organizations, etc. Regular military can also refer to full-time status (standing army), versus reserve or part-time personnel. Other distinctions may separate statutory forces (established under laws such as the National Defence Act), from de facto "non-statutory" forces such as some guerrilla and revolutionary armies.
Structure.
Armies are always divided into various specialties, according to the mission, role, and training of individual units, and sometimes individual soldiers within a unit.
Some of the groupings common to all armies include the following:
History.
India.
During the Iron Age, the Maurya and Nanda Empires had one of the largest armies in the world, the peak being approximately over 600,000 Infantry, 30,000 Cavalry, 8,000 War-Chariots and 9,000 War Elephants not including tributary state allies. In the Gupta age, large armies of longbowmen were recruited to fight off invading horse archer armies. Elephants, pikemen, and cavalry were other featured troops.
China.
The states of China raised armies for at least 1000 years before the Spring and Autumn Annals. By the Warring States period, the crossbow had been perfected enough to become a military secret, with bronze bolts that could pierce any armor. Thus any political power of a state rested on the armies and their organization. China underwent political consolidation of the states of Han (韓), Wei (魏), Chu (楚), Yan (燕), Zhao (趙) and Qi (齊), until by 221 BCE, Qin Shi Huang (秦始皇帝), the first emperor of the Qin dynasty, attained absolute power. This first emperor of China could command the creation of a Terracotta Army to guard his tomb in the city of Xi'an (西安). in addition to a realignment of the Great Wall of China to strengthen his empire against insurrection, invasion and incursion.
Sun Tzu's "The Art of War" remains one of China's Seven Military Classics, even though it is two thousand years old. Since no political figure could exist without an army, measures were taken to ensure only the most capable leaders could control the armies. Civil bureaucracies (士大夫) arose to control the productive power of the states, and their military power.
Sparta.
The Spartan Army was one of the earliest known professional armies. Boys were sent to a barracks at the age of seven or eight to train for becoming a soldier. At the age of thirty, they were released from the barracks and allowed to marry and have a family. After that, men devoted their lives to war until their retirement at the age of 60. The Spartan Army was largely composed of hoplites, equipped with arms and armor nearly identical to each other. Each hoplite bore the Spartan emblem and a scarlet uniform. The main pieces of this armor were a round shield, a spear and a helmet.
Ancient Rome.
The Roman Army had its origins in the citizen army of the Republic, which was staffed by citizens serving mandatory duty for Rome. Conscription remained the main method through which Rome mustered forces until the end of the Republic. The army eventually became a professional organization largely of citizens, who would served continuously for 25 years before being discharged.
The Romans were also noted for making use of auxiliary troops, non-Romans who served with the legions and filled roles that the traditional Roman military could not fill effectively, such as light skirmish troops and heavy cavalry. After their service in the army they were made citizens of Rome and then their children were citizens also. They were also given land and money to settle in Rome. In the Late Roman Empire, these auxiliary troops, along with foreign mercenaries, became the core of the Roman Army; moreover, by the time of the Late Roman Empire tribes such as the Visigoths were paid to serve as mercenaries.
Medieval Europe.
In the earliest Middle Ages it was the obligation of every aristocrat to respond to the call to battle with his own equipment, archers, and infantry. This decentralized system was necessary due to the social order of the time, but could lead to motley forces with variable training, equipment and abilities. The more resources the noble had access to, the better his troops would be.
Initially, the words "knight" and "noble" were used interchangeably as there was not generally a distinction between them. While the nobility did fight upon horseback, they were also supported by lower class citizens – and mercenaries and criminals – whose only purpose was participating in warfare because, most often than not, they held brief employment during their lord's engagement. As the Middle Ages progressed and feudalism developed in a legitimate social and economic system, knights started to develop into their own class with a minor caveat: they were still in debt to their lord. No longer primarily driven by economic need, the newly established vassal class were, instead, driven by fealty and chivalry.
As central governments grew in power, a return to the citizen armies of the classical period also began, as central levies of the peasantry began to be the central recruiting tool. England was one of the most centralized states in the Middle Ages, and the armies that fought in the Hundred Years' War were, predominantly, composed of paid professionals.
In theory, every Englishman had an obligation to serve for forty days. Forty days was not long enough for a campaign, especially one on the continent.
Thus the scutage was introduced, whereby most Englishmen paid to escape their service and this money was used to create a permanent army. However, almost all high medieval armies in Europe were composed of a great deal of paid core troops, and there was a large mercenary market in Europe from at least the early 12th century.
As the Middle Ages progressed in Italy, Italian cities began to rely mostly on mercenaries to do their fighting rather than the militias that had dominated the early and high medieval period in this region. These would be groups of career soldiers who would be paid a set rate. Mercenaries tended to be effective soldiers, especially in combination with standing forces, but in Italy they came to dominate the armies of the city states. This made them considerably less reliable than a standing army. Mercenary-on-mercenary warfare in Italy also led to relatively bloodless campaigns which relied as much on maneuver as on battles.
In 1439 the French legislature, known as the Estates General (French: "états généraux"), passed laws that restricted military recruitment and training to the king alone. There was a new tax to be raised known as the "taille" that was to provide funding for a new Royal army. The mercenary companies were given a choice of either joining the Royal army as "compagnies d'ordonnance" on a permanent basis, or being hunted down and destroyed if they refused. France gained a total standing army of around 6,000 men, which was sent out to gradually eliminate the remaining mercenaries who insisted on operating on their own. The new standing army had a more disciplined and professional approach to warfare than its predecessors. The reforms of the 1440s, eventually led to the French victory at Castillon in 1453, and the conclusion of the Hundred Years' War. By 1450 the companies were divided into the field army, known as the "grande ordonnance" and the garrison force known as the "petite ordonnance".
Early modern.
First nation states lacked the funds needed to maintain standing forces, so they tended to hire mercenaries to serve in their armies during wartime. Such mercenaries typically formed at the ends of periods of conflict, when men-at-arms were no longer needed by their respective governments.
The veteran soldiers thus looked for other forms of employment, often becoming mercenaries. Free Companies would often specialize in forms of combat that required longer periods of training that was not available in the form of a mobilized militia.
As late as the 1650s, most troops were mercenaries. However, after the 17th century, most states invested in better disciplined and more politically reliable permanent troops. For a time mercenaries became important as trainers and administrators, but soon these tasks were also taken by the state. The massive size of these armies required a large supporting force of administrators.
The newly centralized states were forced to set up vast organized bureaucracies to manage these armies, which some historians argue is the basis of the modern bureaucratic state. The combination of increased taxes and increased centralization of government functions caused a series of revolts across Europe such as the Fronde in France and the English Civil War.
In many countries, the resolution of this conflict was the rise of absolute monarchy. Only in England and the Netherlands did representative government evolve as an alternative. From the late 17th century, states learned how to finance wars through long term low interest loans from national banking institutions. The first state to master this process was the Dutch Republic. This transformation in the armies of Europe had great social impact. The defense of the state now rested on the commoners, not on the aristocrats. However, aristocrats continued to monopolize the officer corps of almost all early modern armies, including their high command. Moreover, popular revolts almost always failed unless they had the support and patronage of the noble or gentry classes. The new armies, because of their vast expense, were also dependent on taxation and the commercial classes who also began to demand a greater role in society. The great commercial powers of the Dutch and English matched much larger states in military might.
As any man could be quickly trained in the use of a musket, it became far easier to form massive armies. The inaccuracy of the weapons necessitated large groups of massed soldiers. This led to a rapid swelling of the size of armies. For the first time huge masses of the population could enter combat, rather than just the highly skilled professionals.
It has been argued that the drawing of men from across the nation into an organized corps helped breed national unity and patriotism, and during this period the modern notion of the nation state was born. However, this would only become apparent after the French Revolutionary Wars. At this time, the "levée en masse" and conscription would become the defining paradigm of modern warfare.
Before then, however, most national armies were in fact composed of many nationalities. In Spain armies were recruited from all the Spanish European territories including Spain, Italy, Wallonia (Walloon Guards) and Germany. The French recruited some soldiers from Germany, Switzerland as well as from Piedmont. Britain recruited Hessian and Hanovrian troops until the late 18th century. Irish Catholics made careers for themselves in the armies of many Catholic European states.
Prior to the English Civil War in England, the monarch maintained a personal bodyguard of Yeomen of the Guard and the Honourable Corps of Gentlemen at Arms, or "gentlemen pensioners", and a few locally raised companies to garrison important places such as Berwick on Tweed or Portsmouth (or Calais before it was recaptured by France in 1558).
Troops for foreign expeditions were raised upon an "ad hoc" basis. Noblemen and professional regular soldiers were commissioned by the monarch to supply troops, raising their quotas by indenture from a variety of sources. On January 26, 1661 Charles II issued the Royal Warrant that created the genesis of what would become the British Army, although the Scots Army and English Army would remain two separate organizations until the unification of England and Scotland in 1707. The small force was represented by only a few regiments.
After the American Revolutionary War the Continental Army was quickly disbanded as part of the Americans' distrust of standing armies, and irregular state militias became the sole ground army of the United States, with the exception of one battery of artillery guarding West Point's arsenal. Then First American Regiment was established in 1784. However, because of continuing conflict with Native Americans, it was soon realized that it was necessary to field a trained standing army. The first of these, the Legion of the United States, was established in 1791.
Until 1733 the common soldiers of Prussian Army consisted largely of peasantry recruited or impressed from Brandenburg–Prussia, leading many to flee to neighboring countries. To halt this trend, Frederick William I divided Prussia into regimental cantons. Every youth was required to serve as a soldier in these recruitment districts for three months each year; this met agrarian needs and added extra troops to bolster the regular ranks.
Russian tsars before Peter I of Russia maintained professional hereditary musketeer corps (streltsy in Russian) that were highly unreliable and undisciplined. In times of war the armed forces were augmented by peasants. Peter I introduced a modern regular army built on German model, but with a new aspect: officers not necessarily from nobility, as talented commoners were given promotions that eventually included a noble title at the attainment of an officer's rank. Conscription of peasants and townspeople was based on quota system, per settlement. Initially it was based on the number of households, later it was based on the population numbers. The term of service in the 18th century was for life. In 1793 it was reduced to 25 years. In 1834 it was reduced to 20 years plus 5 years in reserve and in 1855 to 12 years plus 3 years of reserve.
The first Ottoman standing army were Janissaries. They replaced forces that mostly comprised tribal warriors ("ghazis") whose loyalty and morale could not always be trusted. The first Janissary units were formed from prisoners of war and slaves, probably as a result of the sultan taking his traditional one-fifth share of his army's treasure they looted in kind rather than cash.
From the 1380s onwards, their ranks were filled under the "devşirme" system, where feudal dues were paid by service to the sultan. The "recruits" were mostly Christian youths, reminiscent of mamluks.
China organized the Manchu people into the Eight Banner system in the early 17th century. Defected Ming armies formed the Green Standard Army. These troops enlisted voluntarily and for long terms of service.
Late modern.
Conscription allowed the French Republic to form the "Grande Armée", what Napoleon Bonaparte called "the nation in arms", which successfully battled European professional armies.
Conscription, particularly when the conscripts are being sent to foreign wars that do not directly affect the security of the nation, has historically been highly politically contentious in democracies.
In developed nations, the increasing emphasis on technological firepower and better-trained fighting forces, make mass conscription unlikely in the foreseeable future.
Russia, as well as many other nations, retains mainly a conscript army. There is also a very rare "citizen army" as used in Switzerland (see Military of Switzerland).
Field army.
A particular army can be named or numbered to distinguish it from military land forces in general. For example, the First United States Army and the Army of Northern Virginia. In the British Army it is normal to spell out the ordinal number of an army (e.g. First Army), whereas lower formations use figures (e.g. 1st Division).
Armies (as well as army groups and theaters) are large formations which vary significantly between armed forces in size, composition, and scope of responsibility.
In the Soviet Red Army and the Soviet Air Force, "Armies" could vary in size, but were subordinate to an Army Group-sized "front" in wartime. In peacetime, a Soviet army was usually subordinate to a military district. Viktor Suvorov's "Inside the Soviet Army" describes how Cold War era Soviet military districts were actually composed of a front headquarters and a military district headquarters co-located for administration and deception ('maskirovika') reasons.
Formations.
In many countries, especially in Europe or North America, armies are often subdivided as follows:
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Alligatoridae
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The family Alligatoridae of crocodylians includes alligators, caimans and their extinct relatives.
Phylogeny.
The superfamily Alligatoroidea includes all crocodilians (fossil and extant) that are more closely related to the American alligator than to either the Nile crocodile or the gharial. This is a stem-based definition for alligators, and is more inclusive than the crown group Alligatoridae. As a crown group, Alligatoridae only includes the last common ancestor of all extant (living) alligators, caimans, and their descendants (living or extinct), whereas Alligatoroidea, as a stem-based group, also includes more basal extinct alligator ancestors that are more closely related to living alligators than to crocodiles or gavialids. When considering only living taxa (neontology), Alligatoroidea and Alligatoridae contain the same species.
The simplified cladogram below shows Alligatoridae's relationships to other extant (living) crocodilians.
Alligatoridae contains eight living species: two alligators within Alligatorinae, and the six caimans of Caimaninae. Phylogenetic studies using molecular DNA consistently resolve their relationships as follows:
The below detailed cladogram shows one proposal for the internal relationships within Alligatoridae including fossil species, based on morphological analysis (although the exact alligatoroid phylogeny is still disputed).
Evolution.
The superfamily Alligatoroidea is thought to have split from the crocodile-gharial lineage in the late Cretaceous, about 87 million years ago. "Leidyosuchus" of Alberta is among the earliest known genera. Fossil alligatoroids have been found throughout Eurasia as land bridges across both the North Atlantic and the Bering Strait have connected North America to Eurasia during the Cretaceous, Paleogene, and Neogene periods. Alligators and caimans split in North America during the early Tertiary or late Cretaceous (about 53 million to about 65 million years ago) and the latter reached South America by the Paleogene, before the closure of the Isthmus of Panama during the Neogene period. The Chinese alligator split from the American alligator about 33 million years ago and likely descended from a lineage that crossed the Bering land bridge during the Neogene. The modern American alligator is well represented in the fossil record of the Pleistocene. The alligator's full mitochondrial genome was sequenced in the 1990s. The full genome, published in 2014, suggests that the alligator evolved much more slowly than mammals and birds.
True alligators.
The lineage including alligators proper (Alligatorinae) occurs in the fluvial deposits of the age of the Upper Chalk in Europe, where they died out in the Pliocene age. The true alligators are today represented by two species, "A. mississippiensis" in the southeastern United States which can grow to and weigh , with unverified sizes of up to , and the small "A. sinensis" in the Yangtze River, China, which grows to an average of . Their name derives from the Spanish "el lagarto", which means "the lizard".
Caimans.
In Central and South America, the alligator family is represented by six species of the subfamily Caimaninae, which differ from the alligator by the absence of a bony septum between the nostrils, and having ventral armour composed of overlapping bony scutes, each of which is formed of two parts united by a suture. Besides the three species in "Caiman", the smooth-fronted caimans in genus "Paleosuchus" and the black caiman in "Melanosuchus" are described. Caimans tend to be more agile and crocodile-like in their movements, and have longer, sharper teeth than alligators.
"C. crocodilus", the spectacled caiman, has the widest distribution, from southern Mexico to the northern half of Argentina, and grows to a modest size of about . The largest is the near-threatened "Melanosuchus niger", the "jacaré-açu" or large or black caiman of the Amazon River basin. Black caimans grow to , with the unverified size of up to . The black caiman and American alligator are the only members of the alligator family that pose the same danger to humans as the larger species of the crocodile family.
Although caimans have not been studied in depth, scientists have learned their mating cycles (previously thought to be spontaneous or year-round) are linked to the rainfall cycles and the river levels, which increases chances of survival for their offspring.
Taxonomy.
† = extinct
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Alder
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Alders are trees of the genus Alnus in the birch family Betulaceae. The genus includes about 35 species of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few species extending into Central America, as well as the northern and southern Andes.
Description.
With a few exceptions, alders are deciduous, and the leaves are alternate, simple, and serrated. The flowers are catkins with elongate male catkins on the same plant as shorter female catkins, often before leaves appear; they are mainly wind-pollinated, but also visited by bees to a small extent. These trees differ from the birches ("Betula", another genus in the family) in that the female catkins are woody and do not disintegrate at maturity, opening to release the seeds in a similar manner to many conifer cones.
The largest species are red alder ("A. rubra") on the west coast of North America, and black alder ("A. glutinosa"), native to most of Europe and widely introduced elsewhere, both reaching over . By contrast, the widespread "Alnus alnobetula" (green alder) is rarely more than a shrub.
Phylogeny.
Classification.
The genus is divided into three subgenera:
Subgenus "Alnus".
Trees with stalked shoot buds, male and female catkins produced in autumn (fall) but stay closed over winter, pollinating in late winter or early spring, about 15–25 species, including:
Subgenus "Clethropsis".
Trees or shrubs with stalked shoot buds, male and female catkins produced in autumn (fall) and expanding and pollinating then, three species:
Subgenus "Alnobetula".
Shrubs with shoot buds not stalked, male and female catkins produced in late spring (after leaves appear) and expanding and pollinating then, one to four species:
Species names with uncertain taxonomic status.
The status of the following species is unresolved:
Hybrids.
The following hybrids have been described:
The status of the following hybrids is unresolved:
Fossil record.
The oldest fossil pollen that can be identified as "Alnus" is from northern Bohemia, dating to the late Paleocene, around 58 million years ago.
Etymology.
The common name "alder" evolved from the Old English word "alor", which in turn is derived from Proto-Germanic root "aliso". The generic name "Alnus" is the equivalent Latin name, from whence French "aulne" and Spanish "Alamo" (Spanish term for "poplar").
Ecology.
Alders are commonly found near streams, rivers, and wetlands. Sometimes where the prevalence of alders is particularly prominent these are called alder carrs. In the Pacific Northwest of North America, the white alder ("Alnus rhombifolia") unlike other northwest alders, has an affinity for warm, dry climates, where it grows along watercourses, such as along the lower Columbia River east of the Cascades and the Snake River, including Hells Canyon.
Alder leaves and sometimes catkins are used as food by numerous butterflies and moths.
"A. glutinosa" and "A. viridis" are classed as environmental weeds in New Zealand. Alder leaves and especially the roots are important to the ecosystem because they enrich the soil with nitrogen and other nutrients.
Nitrogen fixation and succession of woodland species.
Alder is particularly noted for its important symbiotic relationship with "Frankia alni", an actinomycete, filamentous, nitrogen-fixing bacterium. This bacterium is found in root nodules, which may be as large as a human fist, with many small lobes, and light brown in colour. The bacterium absorbs nitrogen from the air and makes it available to the tree. Alder, in turn, provides the bacterium with sugars, which it produces through photosynthesis. As a result of this mutually beneficial relationship, alder improves the fertility of the soil where it grows, and as a pioneer species, it helps provide additional nitrogen for the successional species to follow.
Because of its abundance, red alder delivers large amounts of nitrogen to enrich forest soils. Red alder stands have been found to supply between of nitrogen annually to the soil. From Alaska to Oregon, "Alnus viridis" subsp. "sinuata" ("A. sinuata", Sitka alder or slide alder), characteristically pioneer fresh, gravelly sites at the foot of retreating glaciers. Studies show that Sitka alder, a more shrubby variety of alder, adds nitrogen to the soil at an average rate of per year, helping convert the sterile glacial terrain to soil capable of supporting a conifer forest. Alders are common among the first species to colonize disturbed areas from floods, windstorms, fires, landslides, etc. Alder groves often serve as natural firebreaks since these broad-leaved trees are much less flammable than conifers. Their foliage and leaf litter does not carry a fire well, and their thin bark is sufficiently resistant to protect them from light surface fires. In addition, the light weight of alder seedsnumbering allows for easy dispersal by the wind. Although it outgrows coastal Douglas-fir for the first 25 years, it is very shade intolerant and seldom lives more than 100 years. Red alder is the Pacific Northwest's largest alder and the most plentiful and commercially important broad-leaved tree in the coastal Northwest. Groves of red alder in diameter intermingle with young Douglas-fir forests west of the Cascades, attaining a maximum height of in about sixty years, and then are afflicted by heart rot. Alders largely help create conditions favorable for giant conifers that replace them.
Parasites.
Alder roots are parasitized by northern groundcone.
Uses.
The catkins of some alder species have a degree of edibility, and may be rich in protein. Reported to have a bitter and unpleasant taste, they are more useful for survival purposes. The wood of certain alder species is often used to smoke various food items such as coffee, salmon, and other seafood.
Alder is notably stable when immersed, and has been used for millennia as a material for pilings for piers and wharves. Most of the pilings that form the foundation of Venice were made from alder trees.
Alder bark contains the anti-inflammatory salicin, which is metabolized into salicylic acid in the body. Some Native American cultures use red alder bark ("Alnus rubra") to treat poison oak, insect bites, and skin irritations. Blackfeet Indians have traditionally used an infusion made from the bark of red alder to treat lymphatic disorders and tuberculosis. Recent clinical studies have verified that red alder contains betulin and lupeol, compounds shown to be effective against a variety of tumors.
The inner bark of the alder, as well as red osier dogwood, or chokecherry, is used by some Indigenous peoples of the Americas in smoking mixtures, known as "kinnikinnick", to improve the taste of the bearberry leaf.
Alder is illustrated in the coat of arms for the Austrian town of Grossarl.
Electric guitars, most notably those manufactured by the Fender Musical Instruments Corporation, have been built with alder bodies since the 1950s. Alder is appreciated for its tone that is claimed to be tight and evenly balanced, especially when compared to mahogany, and has been adopted by many electric guitar manufacturers. It usually is finished in opaque lacquer (nitrocellulose, polyurethane, or polyester), as it does not have a prominent grain.
As a hardwood, alder is used in making furniture, cabinets, and other woodworking products. In these applications, its aforementioned lack of prominent grain means that it is often veneered, either by stained light woods such as oak, ash, or figured maple, or by darker woods such as teak or walnut.
Alder bark and wood (like oak and sweet chestnut) contain tannin and are traditionally used to tan leather.
A red dye can also be extracted from the outer bark, and a yellow dye from the inner bark.
Culture.
Ermanno Olmi's movie "The Tree of Wooden Clogs" ("L' Albero Degli Zoccoli", 1978) refers in its title to alder, typically used to make clogs as in this movie's plot.
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Amos Bronson Alcott
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Amos Bronson Alcott (; November 29, 1799 – March 4, 1888) was an American teacher, writer, philosopher, and reformer. As an educator, Alcott pioneered new ways of interacting with young students, focusing on a conversational style, and avoided traditional punishment. He hoped to perfect the human spirit and, to that end, advocated a plant-based diet. He was also an abolitionist and an advocate for women's rights.
Born in Wolcott, Connecticut, in 1799, Alcott had only minimal formal schooling before attempting a career as a traveling salesman. Worried that the itinerant life might have a negative impact on his soul, he turned to teaching. His innovative methods, however, were controversial, and he rarely stayed in one place very long. His most well-known teaching position was at the Temple School in Boston. His experience there was turned into two books: "Records of a School" and "Conversations with Children on the Gospels". Alcott became friends with Ralph Waldo Emerson and became a major figure in transcendentalism. His writings on behalf of that movement, however, are heavily criticized for being incoherent. Based on his ideas for human perfection, Alcott founded Fruitlands, a transcendentalist experiment in community living. The project failed after seven months. Alcott and his family struggled financially for most of his life. Nevertheless, he continued focusing on educational projects and opened a new school at the end of his life in 1879. He died in 1888.
Alcott married Abby May in 1830, and they had four surviving children, all daughters. Their second was Louisa May, who fictionalized her experience with the family in her novel "Little Women" in 1868.
Life and work.
Early life.
A native New Englander, Amos Bronson Alcott was born in Wolcott, Connecticut (then recently renamed from "Farmingbury") on November 29, 1799. His parents were Joseph Chatfield Alcott and Anna Bronson Alcott. The family home was in an area known as Spindle Hill, and his father, Joseph Alcox, traced his ancestry to colonial-era settlers in eastern Massachusetts. The family originally spelled their name "Alcock", later changed to "Alcocke" then "Alcox". Amos Bronson, the oldest of eight children, later changed the spelling to "Alcott" and dropped his first name.
At age six, young Bronson began his formal education in a one-room schoolhouse in the center of town but learned how to read at home with the help of his mother. The school taught only reading, writing, and spelling, and he left this school at the age of 10. At age 13, his uncle, Reverend Tillotson Bronson, invited Alcott into his home in Cheshire, Connecticut, to be educated and prepared for college. Bronson gave it up after only a month and was self-educated from then on. He was not particularly social and his only close friend was his neighbor and second cousin William Alcott, with whom he shared books and ideas. Bronson Alcott later reflected on his childhood at Spindle Hill: "It kept me pure ... I dwelt amidst the hills ... God spoke to me while I walked the fields." Starting at age 15, he worked for clockmaker Seth Thomas in the nearby town of Plymouth.
At age 17, Alcott passed the exam for a teaching certificate but had trouble finding work as a teacher. Instead, he left home and became a traveling salesman in the American South, peddling books and merchandise. He hoped the job would earn him enough money to support his parents, "to make their cares, and burdens less ... and get them free from debt", though he soon spent most of his earnings on a new suit. At first, he thought it an acceptable occupation but soon worried about his spiritual well-being. In March 1823, Alcott wrote to his brother: "Peddling is a hard place to serve God, but a capital one to serve Mammon." Near the end of his life, he fictionalized this experience in his book, "New Connecticut", originally circulated only among friends before its publication in 1881.
Early career and marriage.
By the summer of 1823, Alcott returned to Connecticut in debt to his father, who had bailed him out after his last two unsuccessful sales trips. He took a job as a schoolteacher in Cheshire with the help of his Uncle Tillotson. He quickly set about reforming the school. He added backs to the benches on which students sat, improved lighting and heating, de-emphasized rote learning, and provided individual slates to each student—paid for by himself. Alcott had been influenced by educational philosophy of the Swiss pedagogue Johann Heinrich Pestalozzi and even renamed his school "The Cheshire Pestalozzi School".
His style attracted the attention of Samuel Joseph May, who introduced Alcott to his sister Abby May. She called him, "an intelligent, philosophic, modest man" and found his views on education "very attractive". Locals in Cheshire were less supportive and became suspicious of his methods. Many students left and were enrolled in the local common school or a recently reopened private school for boys. On November 6, 1827, Alcott started teaching in Bristol, Connecticut, still using the same methods he used in Cheshire, but opposition from the community surfaced quickly; he was unemployed by March 1828. He moved to Boston on April 24, 1828, and was immediately impressed, referring to the city as a place "where the light of the sun of righteousness has risen". He opened the Salem Street Infant School two months later on June 23. Abby May applied as his teaching assistant; instead, the couple were engaged, without consent of the family. They were married at King's Chapel on May 22, 1830; he was 30 years old and she was 29. Her brother conducted the ceremony and a modest reception followed at her father's house. After their marriage the Alcotts moved to 12 Franklin Street in Boston, a boarding house run by a Mrs. Newall. Around this time, Alcott also first expressed his public disdain for slavery. In November 1830, he and William Lloyd Garrison founded what he later called a "preliminary Anti-Slavery Society", though he differed from Garrison as a nonresistant. Alcott became a member of the Boston Vigilance Committee.
Attendance at Alcott's school was falling when a wealthy Quaker named Reuben Haines III proposed that he and educator William Russell start a new school in Pennsylvania, associated with the Germantown Academy. Alcott accepted and he and his newly pregnant wife set forth on December 14. The school was established in Germantown Pennsylvania, which at the time was a separate town from Philadelphia. The Alcotts were offered a rent-free home by Haines. Alcott and Russell were initially concerned that the area would not be conducive to their progressive approach to education and considered establishing the school in nearby Philadelphia instead. Unsuccessful, they went back to Germantown, though the rent-free home was no longer available, and the Alcotts instead had to rent rooms in a boarding-house. It was there that their first child, a daughter they named Anna Bronson Alcott, was born on March 16, 1831, after 36 hours of labor. By the fall of that year, their benefactor Haines died suddenly and the Alcotts again suffered financial difficulty. "We hardly earn the bread", wrote Abby May to her brother, "[and] the butter we have to think about."
The couple's second daughter, Louisa May Alcott, was born on her father's birthday, November 29, 1832, at a half-hour past midnight. Bronson described her as "a very fine healthful child, much more so than Anna was at birth". The Germantown school, however, was faltering, and soon only eight pupils remained. Their benefactor Haines, having died before Louisa's birth, had recruited students and paid tuition for some of them. As Abby wrote, Haines' death, "has prostrated all our hopes here". On April 10, 1833, the family moved to Philadelphia, where Alcott ran a day school. As usual, Alcott's methods were controversial; a former student later referred to him as "the most eccentric man who ever took on himself to train and form the youthful mind". Alcott began to believe Boston was the best place for his ideas to flourish. He contacted theologian William Ellery Channing for support. Channing approved of Alcott's methods and promised to help find students to enroll, including his own daughter Mary. Channing also secured aid from Justice Lemuel Shaw and Boston mayor Josiah Quincy Jr.
Experimental educator.
On September 22, 1834, Alcott opened a school of about 30 students, mostly from wealthy families. It was named the Temple School because classes were held at the Masonic Temple on Tremont Street in Boston. His assistant was Elizabeth Palmer Peabody, later replaced by Margaret Fuller. Mary Peabody Mann served as a French instructor for a time. The school was briefly famous, and then infamous, because of Alcott's method of "discarding text-books and teaching by conversation", his questioning attitude toward the Bible, and his reception of "a colored girl" into his classes.
Before 1830, primary and secondary teaching of writing consisted of rote drills in grammar, spelling, vocabulary, penmanship and transcription of adult texts. In that decade, however, progressive reformers such as Alcott, influenced by Pestalozzi, Friedrich Fröbel, and Johann Friedrich Herbart, began to advocate compositions based on students' own experiences. These reformers opposed beginning instruction with rules and preferred to have students learn to write by expressing their personal understanding of the events of their lives.
Alcott sought to develop instruction on the basis of self-analysis, with an emphasis on conversation and questioning rather than lecturing and drill. A similar interest in instructive conversation was shared by Abby May who, describing her idea of a family "post office" set up to curb potential domestic tension, said "I thought it would afford a daily opportunity for the children, indeed all of us, to interchange thought and sentiment".
Alongside writing and reading, Alcott gave lessons in "spiritual culture", which included interpretation of the Gospels, and advocated "object teaching" in writing instruction. He even went so far as to decorate his schoolroom with visual elements he thought would inspire learning: paintings, books, comfortable furniture, and busts or portraits of Plato, Socrates, Jesus, and William Ellery Channing.
During this time, the Alcotts had another child. Born on June 24, 1835, she was named Elizabeth Peabody Alcott in honor of the teaching assistant at the Temple School. By age three, however, her mother changed her name to Elizabeth "Sewall" Alcott, after her own mother, perhaps because of the recent rupture between Bronson Alcott and Elizabeth Palmer Peabody.
In July 1835, Peabody published her account as an assistant to the Temple School as "Record of a School: Exemplifying the General Principles of Spiritual Culture". While working on a second book, Alcott and Peabody had a falling out and "Conversations with Children on the Gospels" was prepared with help from Peabody's sister Sophia, published at the end of December 1836. Alcott's methods were not well received; many found his conversations on the Gospels close to blasphemous. For example, he asked students to question if Biblical miracles were literal and suggested that all people are part of God. In the "Boston Daily Advertiser", Nathan Hale criticized Alcott's "flippant and off hand conversation" about serious topics from the Virgin birth of Jesus to circumcision. Joseph T. Buckingham called Alcott "either insane or half-witted" and "an ignorant and presuming charlatan". The book did not sell well; a Boston lawyer bought 750 copies to use as waste paper.
The Temple School was widely denounced in the press. Reverend James Freeman Clarke was one of Alcott's few supporters and defended him against the harsh response from Boston periodicals. Alcott was rejected by most public opinion and, by the summer of 1837, he had only 11 students left and no assistant after Margaret Fuller moved to Providence, Rhode Island. The controversy had caused many parents to remove their children and, as the school closed, Alcott became increasingly financially desperate. Remaining steadfast to his pedagogy, a forerunner of progressive and democratic schooling, he alienated parents in a later "parlor school" by admitting an African American child to the class, whom he then refused to expel in the face of protests.
Transcendentalist.
Beginning in 1836, Alcott's membership in the Transcendental Club put him in the company of such as Ralph Waldo Emerson, Orestes Brownson and Theodore Parker. He became a member at the club's second meeting and hosted its third. A biographer of Emerson described the group as "the occasional meetings of a changing body of liberal thinkers, agreeing in nothing but their liberality". Frederic Henry Hedge wrote similarly that "[t]here was no club in the strict sense ... only occasional meetings of like-minded men and women". Alcott preferred the term "Symposium" for their group.
Alcott's only son, born on April 6, 1839, lived only a few minutes. Abby May recorded: "Gave birth to a fine boy full grown perfectly formed but not living".
In late April 1840, Alcott moved to the town of Concord, as urged by Emerson. He rented a home he called Dove Cottage for $50 a year within walking distance of Emerson's house As a supporter of Alcott's philosophies, Emerson offered to help Alcott with his writing. This proved a difficult task. For example, after several revisions of the essay "Psyche" (Alcott's account of how he educated his daughters), Emerson deemed it unpublishable. Alcott also wrote a series patterned after the work of Johann Wolfgang von Goethe which was published in the Transcendentalists' journal, "The Dial". Emerson had written to Margaret Fuller, then editor, that Alcott's so-called "Orphic Sayings" might "pass muster & even pass for just & great", but they were widely mocked as silly and unintelligible. Fuller herself disliked them but did not want to hurt Alcott's feelings. The following example appeared in the first issue:
On May 8, 1842, Alcott left his family in the care of his brother Junius so that he could travel to England with financial support from Emerson. There he met admirers Charles Lane and Henry C. Wright, who were supporters of Alcott House, an experimental school outside London based on Alcott's Temple School methods. They followed Alcott back to the United States and, in an early communitarian experiment, Lane and his son moved in with the Alcotts.
Persuaded in part by Lane's abolitionist views, Alcott took a stand against President Tyler's plan to annex Texas as a slave territory and refused to pay his poll tax. Abby May wrote in her journal on January 17, 1843, "A day of some excitement, as Mr. Alcott refused to pay his town tax ... After waiting some time to be committed [to jail], he was told it was paid by a friend. Thus we were spared the affliction of his absence and the triumph of suffering for his principles." The incident inspired Henry David Thoreau, whose similar protest against the $1.50 poll tax led to a night in jail and his essay "Civil Disobedience".
Fruitlands.
Lane and Alcott collaborated on a major expansion of their educational theories into a Utopian society. Alcott, however, was still in debt and could not purchase the land needed for their planned community. In a letter, Lane wrote, "I do not see anyone to act the money part but myself." In May 1843, he purchased a farm in Harvard, Massachusetts. Up front, he paid $1,500 of the total $1,800 value of the property; the rest was meant to be paid by the Alcotts over a two-year period. They moved to the farm on June 1 and optimistically named it "Fruitlands" with only ten old apple trees on the property. In July, Alcott announced their plans in "The Dial": "We have made an arrangement with the proprietor of an estate of about a hundred acres, which liberates this tract from human ownership".
Their goal was to regain Eden by finding the formula for agriculture, diet, and reproduction that would enable each individual to live "in harmony with nature, the animal world, his fellows, himself, [and] his creator". To achieve this, they sought to live as independently of the economy as possible, styling themselves a "consociate family". Unlike a similar project named Brook Farm, the participants at Fruitlands avoided interaction with other local communities. At first scorning animal labor as exploitative, they found human spadework insufficient to their needs and eventually allowed some cattle to be "enslaved". They banned coffee, tea, alcoholic drinks, milk, and warm bathwater. As Alcott had published earlier, "Our wine is water, — flesh, bread; — drugs, fruits." One member, Samuel Bower, "gave the community the reputation of refusing to eat potatoes because instead of aspiring toward the sky they grew downward in the earth". For clothing, they prohibited leather, because animals were killed for it, as well as cotton, silk, and wool, because they were products of slave labor. Alcott had high expectations but was often away, attempting to recruit more members when the community most needed him.
The experimental community was never successful, partly because most of the land was not arable. Alcott lamented, "None of us were prepared to actualize practically the ideal life of which we dreamed. So we fell apart". Its founders were often away as well; in the middle of harvesting, they left for a lecture tour through Providence, Rhode Island, New York City, and New Haven, Connecticut. In its seven months, only 13 people joined, including the Alcotts and the Lanes. Ann Page, the only female member aside from Abby May and her daughters, was rumored to have been asked to leave after eating a fish tail with a neighbor.
Lane believed that Alcott had misled him into thinking enough people would join the enterprise. He developed a strong dislike for the nuclear family, quit the project, and moved to a nearby Shaker family with his son, leaving Alcott to fall into a depression in which he did not speak or eat for three days. Abby May, who thought Lane had purposely sabotaged her family, wrote to her brother, "All Mr. Lane's efforts have been to disunite us. But Mr. Alcott's ... paternal instincts were too strong for him."
Abby May was also dissatisfied with their Fruitlands experience, at one point threatening to leave Bronson and move their daughters elsewhere. Louisa May Alcott, who was ten years old at the time, later wrote of the experience in "Transcendental Wild Oats" (1873): "The band of brothers began by spading garden and field; but a few days of it lessened their ardor amazingly."
When the final payment on the farm was owed, Sam May refused to cover his brother-in-law's debts, as he often did, possibly at Abby May's suggestion. With the failure of the experiment, the Alcotts had to leave Fruitlands.
Return to Concord.
In January 1844, Alcott moved his family to Still River, a village within Harvard but, on March 1, 1845, with the assistance of Emerson and Sam May, the family returned to Concord to live in a home they named "The Hillside" (later renamed "The Wayside" by Nathaniel Hawthorne).
At Hillside Louisa had a room of her own and began writing in earnest. She later said that these "were the happiest years" of her life; many of the incidents in her novel "Little Women" (1868) are based on this period. Alcott renovated the property, moving a barn and painting the home a rusty olive color, as well as tending to over six acres of land. On May 23, 1845, Abby May was granted a sum from her father's estate which was put into a trust fund, providing some financial security. That summer, Bronson Alcott let Henry David Thoreau borrow his ax to prepare his home at Walden Pond.
The Alcotts hosted a steady stream of visitors at The Hillside, including fugitive slaves for whom they provided a station on the Underground Railroad. Alcott's opposition to slavery also fueled his opposition to the Mexican–American War which began in 1846. He considered the war a blatant attempt to extend slavery and questioned whether the country was made up of "a people bent on conquest, on getting the golden treasures of Mexico into our hands, and of subjugating foreign peoples."
In 1848, Abby May insisted that they leave Concord, which she called "cold, heartless, brainless, soulless". The Alcott family put The Hillside up for rent and moved to Boston. There, next door to Peabody's book store on West Street, Bronson Alcott hosted a series of lectures modeled on Margaret Fuller's "Conversations" for women. He called his version, "A Course on the Conversations on Man—his History, Resources, and Expectations". Both men and women could attend for a fee of three dollars for one lecture or five dollars for all seven. In March 1853, Alcott was invited to teach fifteen students at Harvard Divinity School in an extracurricular, non-credit course.
When Alcott and his family moved back to Concord after 1857, he and his family lived in the Orchard House until 1877. In 1860, Alcott was named superintendent of Concord Schools.
Civil War years and beyond.
Alcott voted in a presidential election for the first time in 1860. In his journal for November 6, 1860, he wrote: "At Town House, and cast my vote for Lincoln and the Republican candidates generally—the first vote I ever cast for a President and State officers." Alcott was an abolitionist and a friend of the more radical William Lloyd Garrison. He had attended a rally led by Wendell Phillips on behalf of 17-year-old Thomas Sims, a fugitive slave on trial in Boston. Alcott was one of several who attempted to storm the courthouse; when gunshots were heard, he was the only one who stood his ground, though the effort was unsuccessful. He had also stood his ground in a protest against the trial of Anthony Burns. A group had broken down the door of the Boston courthouse but guards beat them back. Alcott stood forward and asked the leader of the group, Thomas Wentworth Higginson, "Why are we not within?" He then walked calmly into the courthouse, was threatened with a gun, and turned back, "but without hastening a step", according to Higginson.
In 1862, Louisa moved to Washington, D.C. to volunteer as a nurse. On January 14, 1863, the Alcotts received a telegram that Louisa was sick; Bronson immediately went to bring her home, briefly meeting Abraham Lincoln while there. Louisa turned her experience into the book "Hospital Sketches". Her father wrote of it, "I see nothing in the way of a good appreciation of Louisa's merits as a woman and a writer."
Henry David Thoreau died on May 6, 1862, likely from an illness he caught from Alcott two years earlier.
At Emerson's request, Alcott helped arrange Thoreau's funeral, which was held at First Parish Sanctuary in Concord, despite Thoreau having disavowed membership in the church when he was in his early twenties. Emerson wrote a eulogy, and Alcott helped plan the preparations. Only two years later, neighbor Nathaniel Hawthorne died as well. Alcott served as a pallbearer along with Louis Agassiz, James T. Fields, Oliver Wendell Holmes Sr., Henry Wadsworth Longfellow, and others. With Hawthorne's death, Alcott worried that few of the Concord notables remained. He recorded in his journal: "Fair figures one by one are fading from sight." The next year, Lincoln was assassinated, which Alcott called "appalling news".
In 1868, Alcott met with publisher Thomas Niles, an admirer of "Hospital Sketches". Alcott asked Niles if he would publish a book of short stories by his daughter; instead, he suggested she write a book about girls. Louisa May was not interested initially but agreed to try. "They want a book of 200 pages or more", Alcott told his daughter. The result was "Little Women", published later that year. The book, which fictionalized the Alcott family during the girls' coming-of-age years, recast the father figure as a chaplain, away from home at the front in the Civil War.
Alcott spoke, as opportunity arose, before the "lyceums" then common in various parts of the United States, or addressed groups of hearers as they invited him. These "conversations" as he called them, were more or less informal talks on a great range of topics, spiritual, aesthetic and practical, in which he emphasized the ideas of the school of American Transcendentalists led by Emerson, who was always his supporter and discreet admirer. He often discussed Platonic philosophy, the illumination of the mind and soul by direct communion with Spirit; upon the spiritual and poetic monitions of external nature; and upon the benefit to man of a serene mood and a simple way of life.
Final years.
Alcott's published books, all from late in his life, include "Tablets" (1868), "Concord Days" (1872), "New Connecticut" (1881), and "Sonnets and Canzonets" (1882). Louisa May attended to her father's needs in his final years. She purchased a house for her sister Anna which had been the last home of Henry David Thoreau, now known as the Thoreau-Alcott House. Louisa and her parents moved in with Anna as well.
After the death of his wife Abby May on November 25, 1877, Alcott never returned to Orchard House, too heartbroken to live there. He and Louisa May collaborated on a memoir and went over her papers, letters, and journals. "My heart bleeds with the memories of those days", he wrote, "and even long years, of cheerless anxiety and hopeless dependence." Louisa noted her father had become "restless with his anchor gone". They gave up on the memoir project and Louisa burned many of her mother's papers.
On January 19, 1879, Alcott and Franklin Benjamin Sanborn wrote a prospectus for a new school which they distributed to potentially interested people throughout the country. The result was the Concord School of Philosophy and Literature, which held its first session in 1879 in Alcott's study in the Orchard House. In 1880 the school moved to the Hillside Chapel, a building next to the house, where he held conversations and, over the course of successive summers, as he entered his eighties, invited others to give lectures on themes in philosophy, religion and letters. The school, considered one of the first formal adult education centers in America, was also attended by foreign scholars. It continued for nine years.
In April 1882, Alcott's friend and benefactor Ralph Waldo Emerson was sick and bedridden. After visiting him, Alcott wrote, "Concord will be shorn of its human splendor when he withdraws behind the cloud." Emerson died the next day. Alcott himself moved out of Concord for his final years, settling at 10 Louisburg Square in Boston beginning in 1885.
As he was bedridden at the end of his life, Alcott's daughter Louisa May came to visit him at Louisburg on March 1, 1888. He said to her, "I am going "up. Come with me"." She responded, "I wish I could." He died three days later on March 4; Louisa May died only two days after her father.
Beliefs.
Alcott was fundamentally and philosophically opposed to corporal punishment as a means of disciplining his students. Instead, beginning at the Temple School, he would appoint a daily student superintendent. When that student observed an infraction, he or she reported it to the rest of the class and, as a whole, they deliberated on punishment. At times, Alcott offered his own hand for an offending student to strike, saying that any failing was the teacher's responsibility. The shame and guilt this method induced, he believed, was far superior to the fear instilled by corporal punishment; when he used physical "correction" he required that the students be unanimously in support of its application, even including the student to be punished.
The most detailed discussion of his theories on education is in an essay, "Observations on the Principles and Methods of Infant Instruction". Alcott believed that early education must draw out "unpremeditated thoughts and feelings of the child" and emphasized that infancy should primarily focus on enjoyment. He noted that learning was not about the acquisition of facts but the development of a reflective state of mind.
Alcott's ideas as an educator were controversial. Writer Harriet Martineau, for example, wrote dubiously that, "the master presupposes his little pupils possessed of all truth; and that his business is to bring it out into expression". Even so, his ideas helped to found one of the first adult education centers in America, and provided the foundation for future generations of liberal education. Many of Alcott's educational principles are still used in classrooms today, including "teach by encouragement", art education, music education, acting exercises, learning through experience, risk-taking in the classroom, tolerance in schools, physical education/recess, and early childhood education. The teachings of William Ellery Channing a few years earlier had also laid the groundwork for the work of most of the Concord Transcendentalists.
The Concord School of Philosophy, which closed following Alcott's death in 1888, was reopened almost 90 years later in the 1970s. It has continued functioning with a Summer Conversational Series in its original building at Orchard House, now run by the Louisa May Alcott Memorial Association.
While many of Alcott's ideas continue to be perceived as being on the liberal/radical edge, they are still common themes in society, including vegetarian/veganism, sustainable living, and temperance/self-control. Alcott described his sustenance as a "Pythagorean diet": Meat, eggs, butter, cheese, and milk were excluded and drinking was confined to well water. Alcott believed that diet held the key to human perfection and connected physical well-being to mental improvement. He further viewed a perfection of nature to the spirit and, in a sense, predicted modern environmentalism by condemning pollution and encouraging humankind's role in sustaining ecology.
Criticism.
Alcott's philosophical teachings have been criticized as inconsistent, hazy or abrupt. He formulated no system of philosophy, and shows the influence of Plato, German mysticism, and Immanuel Kant as filtered through the writings of Samuel Taylor Coleridge. Margaret Fuller referred to Alcott as "a philosopher of the balmy times of ancient Greece—a man whom the worldlings of Boston hold in as much horror as the worldlings of Athens held Socrates." In his later years, Alcott related a story from his boyhood: during a total solar eclipse, he threw rocks at the sky until he fell and dislocated his shoulder. He reflected that the event was a prophecy that he would be "tilting at the sun and always catching the fall".
Like Emerson, Alcott was always optimistic, idealistic, and individualistic in thinking. Writer James Russell Lowell referred to Alcott in his poem "Studies for Two Heads" as "an angel with clipped wings". Even so, Emerson noted that Alcott's brilliant conversational ability did not translate into good writing. "When he sits down to write," Emerson wrote, "all his genius leaves him; he gives you the shells and throws away the kernel of his thought." His "Orphic Sayings", published in "The Dial", became famous for their hilarity as dense, pretentious, and meaningless. In New York, for example, "The Knickerbocker" published a parody titled "Gastric Sayings" in November 1840. A writer for the "Boston Post" referred to Alcott's "Orphic Sayings" as "a train of fifteen railroad cars with one passenger".
Modern critics often fault Alcott for not being able to financially support his family. Alcott himself worried about his own prospects as a young man, once writing to his mother that he was "still at my old trade—hoping." Alcott held his principles above his and his family's well-being. Shortly before his marriage, for example, his future father-in-law Colonel Joseph May helped him find a job teaching at a school in Boston run by the Society of Free Enquirers, followers of Robert Owen, for a lucrative $1,000 to $1,200 annual salary. He refused it because he did not agree with their beliefs, writing, "I shall have nothing to do with them."
From the other perspective, the Alcotts created an environment which produced two famous daughters in different fields in a time when women were not commonly encouraged to have independent careers.
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Arachnophobia
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Arachnophobia is the fear of spiders and other arachnids such as scorpions and ticks. The word "arachnophobia" comes from the Greek words arachne and phobia.
Signs and symptoms.
People with arachnophobia tend to feel uneasy in any area they believe could harbour spiders or that has visible signs of their presence, such as webs. If arachnophobes see a spider, they may not enter the general vicinity until they have overcome the panic attack that is often associated with their phobia. Some people scream, cry, have emotional outbursts, experience trouble breathing, sweat and experience increased heart rates when they come in contact with an area near spiders or their webs. In some extreme cases, even a picture, a toy, or a realistic drawing of a spider can trigger intense fear.
Reasons.
Arachnophobia may be an exaggerated form of an instinctive response that helped early humans to survive or a cultural phenomenon that is most common in predominantly European societies.
Evolutionary.
An evolutionary reason for the phobia remains unresolved. One view, especially held in evolutionary psychology, is that the presence of venomous spiders led to the evolution of a fear of spiders, or made the acquisition of a fear of spiders especially easy. However, there is no evidence that during the Pleistocene there were a sufficient number of venomous African spider fauna to trigger such an evolutionary fear. Like all traits, there is variability in the intensity of fear of spiders, and those with more intense fears are classified as phobic. Being relatively small, spiders do not fit the usual criterion for a threat in the animal kingdom where size is a factor, but they can have medically significant venom and/or cause skin irritation with their setae. However, a phobia is an irrational fear as opposed to a rational fear.
By ensuring that their surroundings were free from spiders, arachnophobes would have had a reduced risk of being bitten in ancestral environments, giving them a slight advantage over non-arachnophobes in terms of survival. However, having a disproportionate fear of spiders in comparison to other, potentially dangerous creatures present during "Homo sapiens"' environment of evolutionary adaptiveness may have had drawbacks.
In "The Handbook of the Emotions" (1993), psychologist Arne Öhman studied pairing an unconditioned stimulus with evolutionarily-relevant fear-response neutral stimuli (snakes and spiders) versus evolutionarily-irrelevant fear-response neutral stimuli (mushrooms, flowers, physical representation of polyhedra, firearms, and electrical outlets) on human subjects and found that ophidiophobia (fear of snakes) and arachnophobia required only one pairing to develop a conditioned response while mycophobia, anthophobia, phobias of physical representations of polyhedra, firearms, and electrical outlets required multiple pairings and went extinct without continued conditioning while the conditioned ophidiophobia and arachnophobia were permanent.
Psychiatrist Randolph M. Nesse notes that while conditioned fear responses to evolutionarily novel dangerous objects such as electrical outlets is possible, the conditioning is slower because such cues have no prewired connection to fear, noting further that despite the emphasis of the risks of speeding and drunk driving in driver's education, it alone does not provide reliable protection against traffic collisions and that nearly one-quarter of all deaths in 2014 of people aged 15 to 24 in the United States were in traffic collisions. Nesse, psychiatrist Isaac Marks, and evolutionary biologist George C. Williams have noted that people with systematically deficient responses to various adaptive phobias (e.g. arachnophobia, ophidiophobia, basophobia) are more temperamentally careless and more likely to receive unintentional injuries that are potentially fatal and have proposed that such deficient phobia should be classified as "hypophobia" due to its selfish genetic consequences.
A 2001 study found that people could detect images of spiders among images of flowers and mushrooms more quickly than they could detect images of flowers or mushrooms among images of spiders. The researchers suggested that this was because fast response to spiders was more relevant to human evolution.
Cultural.
An alternative view is that the dangers, such as from spiders, are overrated and not sufficient to influence evolution. Instead, inheriting phobias would have restrictive and debilitating effects upon survival, rather than being an aid. For some communities, such as in Papua New Guinea and Cambodia, spiders are included in traditional foods. This suggests arachnophobia may, at least in part, be a cultural rather than genetic trait.
Stories about spiders in the media often contain errors and use sensationalistic vocabulary, which could contribute to the fear of spiders.
Treatments.
The fear of spiders can be treated by any of the general techniques suggested for specific phobias. The first line of treatment is systematic desensitization – also known as exposure therapy. Before engaging in systematic desensitization, it is common to train the individual with arachnophobia in relaxation techniques, which will help keep the patient calm. Systematic desensitization can be done in vivo (with live spiders) or by getting the individual to imagine situations involving spiders, then modelling interaction with spiders for the person affected and eventually interacting with real spiders. This technique can be effective in just one session, although it generally takes more time.
Recent advances in technology have enabled the use of virtual or augmented reality spiders for use in therapy. These techniques have proven to be effective. It has been suggested that exposure to short clips from the "Spider-Man" movies may help to reduce an individual's arachnophobia.
Epidemiology.
Arachnophobia affects 3.5 to 6.1 percent of the global population.
Even though most spiders are small and not venomous, they still trigger intense fear in many people, making arachnophobia one of the most widespread anxiety disorders. It is strongly linked to sociodemographic factors like gender, age, education, and an individual's tendency toward disgust. The majority of studies show that females are more likely to develop this phobia.
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Alabaster
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Alabaster is a mineral and a soft rock used for carvings and as a source of plaster powder. Archaeologists, geologists, and the stone industry have different definitions for the word "alabaster". In archaeology, the term "alabaster" includes objects and artefacts made from two different minerals: (i) the fine-grained, massive type of gypsum, and (ii) the fine-grained, banded type of calcite.
Chemically, gypsum is a hydrous sulfate of calcium, whereas calcite is a carbonate of calcium. As types of alabaster, gypsum and calcite have similar properties, such as light color, translucence, and soft stones that can be carved and sculpted; thus the historical use and application of alabaster for the production of carved, decorative artefacts and "objets d’art". Calcite alabaster also is known as onyx-marble, Egyptian alabaster, and Oriental alabaster, which terms usually describe either a compact, banded travertine stone or a stalagmitic limestone colored with swirling bands of cream and brown.
In general, ancient alabaster is calcite in the wider Middle East, including Egypt and Mesopotamia, while it is gypsum in medieval Europe. Modern alabaster is most likely calcite but may be either. Both are easy to work and slightly soluble in water. They have been used for making a variety of indoor artwork and carving, as they will not survive long outdoors.
The two types are readily distinguished by their different hardness: gypsum alabaster (Mohs hardness 1.5 to 2) is so soft that a fingernail scratches it, while calcite (Mohs hardness 3) cannot be scratched in this way but yields to a knife. Moreover, calcite alabaster, being a carbonate, effervesces when treated with hydrochloric acid while gypsum alabaster remains almost unaffected.
Etymology.
The English word "alabaster" was borrowed from Old French ', in turn derived from Latin ', and that from Greek ' (') or ' ('). The Greek words denoted a vase of alabaster.
The name may be derived further from ancient Egyptian "", which refers to vessels of the Egyptian goddess Bast. She was represented as a lioness and frequently depicted as such in figures placed atop these alabaster vessels. Ancient Roman authors Pliny the Elder and Ptolemy wrote that the stone used for ointment jars called "alabastra" came from a region of Egypt known as Alabastron or Alabastrites.
Properties and usability.
The purest alabaster is a snow-white material of fine uniform grain, but it often is associated with an oxide of iron, which produces brown clouding and veining in the stone. The coarser varieties of gypsum alabaster are converted by calcination into plaster of Paris, and are sometimes known as "plaster stone".
The softness of alabaster enables it to be carved readily into elaborate forms, but its solubility in water renders it unsuitable for outdoor work. If alabaster with a smooth, polished surface is washed with dishwashing liquid, it will become rough, dull and whiter, losing most of its translucency and lustre. The finer kinds of alabaster are employed largely as an ornamental stone, especially for ecclesiastical decoration and for the rails of staircases and halls.
Modern processing.
Working techniques.
Alabaster is mined and then sold in blocks to alabaster workshops. There they are cut to the needed size ("squaring"), and then are processed in different techniques: turned on a lathe for round shapes, carved into three-dimensional sculptures, chiselled to produce low relief figures or decoration; and then given an elaborate finish that reveals its transparency, colour, and texture.
Marble imitation.
In order to diminish the translucency of the alabaster and to produce an opacity suggestive of true marble, the statues are immersed in a bath of water and heated gradually—nearly to the boiling point—in an operation requiring great care, because if the temperature is not regulated carefully, the stone acquires a dead-white, chalky appearance. The effect of heating appears to be a partial dehydration of the gypsum. If properly treated, it closely resembles true marble and is known as "marmo di Castellina".
Dyeing.
Alabaster is a porous stone and can be dyed into any colour or shade, a technique used for centuries. For this the stone needs to be fully immersed in various pigment solutions and heated to a specific temperature. The technique can be used to disguise alabaster. In this way an imitation of coral that is called "alabaster coral" is produced.
Types, occurrence, history.
Typically only one type is sculpted in any particular cultural environment, but sometimes both have been worked to make similar pieces in the same place and time. This was the case with small flasks of the alabastron type made in Cyprus from the Bronze Age into the Classical period.
Window panels.
When cut into thin sheets, alabaster is translucent enough to be used for small windows. It was used for this purpose in Byzantine churches and later in medieval ones, especially in Italy. Large sheets of Aragonese gypsum alabaster are used extensively in the Cathedral of Our Lady of the Angels, dedicated in 2002 by the Los Angeles, California, Archdiocese. The cathedral incorporates special cooling to prevent the panes from overheating and turning opaque. The ancients used the calcite type, while the modern Los Angeles cathedral employs gypsum alabaster. There are also multiple examples of alabaster windows in ordinary village churches and monasteries in northern Spain.
Calcite alabaster.
Calcite alabaster, harder than the gypsum variety, was used in ancient Egypt and the wider Middle East (except Assyrian palace reliefs), and also in modern times. It is found as either a stalagmitic deposit from the floor and walls of limestone caverns, or as a kind of travertine, similarly deposited in springs of calcareous water. Its deposition in successive layers gives rise to the banded appearance that the marble often shows on cross-section, from which its name is derived: onyx-marble or alabaster-onyx, or sometimes simply (and wrongly) as onyx.
Egypt and the Middle East.
Egyptian alabaster has been worked extensively near Suez and Assiut.
This stone variety is the "alabaster" of the ancient Egyptians and Bible and is often termed "Oriental alabaster", since the early examples came from the Far East. The Greek name "alabastrites" is said to be derived from the town of Alabastron in Egypt, where the stone was quarried. The locality may owe its name to the mineral; though the origin of the mineral name is obscure
The "Oriental" alabaster was highly esteemed for making small perfume bottles or ointment vases called alabastra; the vessel name has been suggested as a possible source of the mineral name. In Egypt, craftsmen used alabaster for canopic jars and various other sacred and sepulchral objects. The sarcophagus of Seti I, found in his tomb near Thebes, is on display in Sir John Soane's Museum, London; it is carved in a single block of translucent calcite alabaster from Alabastron.
Algerian onyx-marble has been quarried largely in the province of Oran.
Calcite alabaster was quarried in ancient Israel in the cave known as the Twins Cave near Beit Shemesh. Herod used this alabaster for baths in his palaces.
North America.
In Mexico, there are famous deposits of a delicate green variety at La Pedrara, in the district of Tecali, near Puebla. Onyx-marble occurs also in the district of Tehuacán and at several localities in the US including California, Arizona, Utah, Colorado and Virginia.
Gypsum alabaster.
Gypsum alabaster is softer than calcite alabaster. It was used primarily in medieval Europe, and is also used in modern times.
Ancient and Classical Near East.
"Mosul marble" is a kind of gypsum alabaster found in the north of modern Iraq, which was used for the Assyrian palace reliefs of the 9th to 7th centuries BC; these are the largest type of alabaster sculptures to have been regularly made. The relief is very low and the carving detailed, but large rooms were lined with continuous compositions on slabs around high. The "Lion Hunt of Ashurbanipal" and military Lachish reliefs, both 7th century BC and in the British Museum, are some of the best known.
Gypsum alabaster was widely used for small sculpture for indoor use in the ancient world, especially in ancient Egypt and Mesopotamia. Fine detail could be obtained in a material with an attractive finish without iron or steel tools. Alabaster was used for vessels dedicated for use in the cult of the deity Bast in the culture of the ancient Egyptians, and thousands of gypsum alabaster artifacts dating to the late 4th millennium BC also have been found in Tell Brak (modern Nagar), in Syria.
In Mesopotamia, gypsum alabaster was the material of choice for figures of deities and devotees in temples, as in a figure believed to represent the deity Abu dating to the first half of the 3rd millennium BC, which is kept in New York.
Aragon, Spain.
Much of the world's alabaster is extracted from the centre of the Ebro Valley in Aragon, Spain, which has the world's largest known exploitable deposits. According to a brochure published by the Aragon government, alabaster has elsewhere either been depleted, or its extraction is so difficult that it has almost been abandoned or is carried out at a very high cost. There are two separate sites in Aragon, both are located in Tertiary basins. The most important site is the Fuentes-Azaila area, in the Tertiary Ebro Basin. The other is the Calatayud-Teruel Basin, which divides the Iberian Range in two main sectors (NW and SE).
The abundance of Aragonese alabaster was crucial for its use in architecture, sculpture and decoration. There is no record of use by pre-Roman cultures, so the first ones to use alabaster from Aragon may have been the Romans, who produced vessels from alabaster following the Greek and Egyptian models. It seems that since the reconstruction of the Roman Wall in Zaragoza in the 3rd century AD with alabaster, the use of this material became common in building for centuries. Muslim Saraqusta (Zaragoza) was also called "Medina Albaida", the White City, due to the appearance of its alabaster walls and palaces, which stood out among gardens, groves and orchards by the Ebro and Huerva Rivers.
The oldest remains in the Aljafería Palace, together with other interesting elements like capitals, reliefs and inscriptions, were made using alabaster, but it was during the artistic and economic blossoming of the Renaissance that Aragonese alabaster reached its golden age. In the 16th century sculptors in Aragon chose alabaster for their best works. They were adept at exploiting its lighting qualities and generally speaking the finished art pieces retained their natural color.
Volterra (Tuscany).
In modern Europe, the centre of the alabaster trade is Florence, Italy. Tuscan alabaster occurs in nodular masses embedded in limestone, interstratified with marls of Miocene and Pliocene age. The mineral is worked largely by means of underground galleries, in the district of Volterra. Several varieties are recognized—veined, spotted, clouded, agatiform, and others. The finest kind, obtained principally from Castellina, is sent to Florence for figure-sculpture, while the common kinds are carved locally, into vases, lights, and various ornamental objects. These items are objects of extensive trade, especially in Florence, Pisa, and Livorno.
In the 3rd century BC the Etruscans used the alabaster of Tuscany from the area of modern-day Volterra to produce funeral urns, possibly taught by Greek artists. During the Middle Ages the craft of alabaster was almost completely forgotten. A revival started in the mid-16th century, and until the beginning of the 17th century alabaster work was strictly artistic and did not expand to form a large industry.
In the 17th and 18th centuries production of artistic, high-quality Renaissance-style artifacts stopped altogether, replaced by less sophisticated, cheaper items better suited for large-scale production and commerce. The new industry prospered, but the reduced need for skilled craftsmen left few of them still working. The 19th century brought a boom to the industry, largely due to the "traveling artisans" who offered their wares to the palaces of Europe, as well as to America and the East.
In the 19th century new processing technology was also introduced, allowing for the production of custom-made, unique pieces, as well as the combination of alabaster with other materials. Apart from the newly developed craft, artistic work became again possible, chiefly by Volterran sculptor Albino Funaioli. After a short slump, the industry was revived again by the sale of mass-produced mannerist Expressionist sculptures. It was further enhanced in the 1920s by a new branch that created ceiling and wall lamps in the Art Deco style, culminating in participation at the 1925 International Exposition of Modern Industrial and Decorative Arts in Paris. Important names in the evolution of alabaster use after World War II are Volterran Umberto Borgna, the "first alabaster designer", and later on the architect and industrial designer Angelo Mangiarotti.
England and Wales.
Gypsum alabaster is a common mineral, which occurs in England in the Keuper marls of the Midlands, especially at Chellaston in Derbyshire, at Fauld in Staffordshire, and near Newark in Nottinghamshire. Deposits at all of these localities have been worked extensively.
In the 14th and 15th centuries the carving into small statues and sets of relief panels for altarpieces was a valuable local industry in Nottingham, as well as a major English export. These were usually painted, or partly painted. It was also used for the effigies, often life size, on tomb monuments, as the typical recumbent position suited the material's lack of strength, and it was cheaper and easier to work than good marble. After the English Reformation the making of altarpiece sets was discontinued, but funerary monument work in reliefs and statues continued.
In addition to the carvings still in Britain (particularly the Nottingham Castle Museum, British Museum, and Victoria and Albert Museum), trade in mineral alabaster (other than the antiques trade) is ongoing as far afield as the Musée de Cluny, Spain, and Scandinavia.
Alabaster is also found, in smaller quantity, at Watchet in Somerset, near Penarth in Glamorganshire, and elsewhere. In Cumbria it occurs largely in the New Red rocks, but at a lower geological horizon. The alabaster of Nottinghamshire and Derbyshire is found in thick nodular beds or "floors" in spheroidal masses known as "balls" or "bowls" and in smaller lenticular masses termed "cakes". At Chellaston, where the local alabaster is known as "Patrick", it has been worked into ornaments under the name of "Derbyshire spar"―a term more properly applied to fluorspar.
Black alabaster.
"Black alabaster" is a rare anhydrite form of the gypsum-based mineral. The black form is found in only three veins in the world, one each in United States, Italy, and China.
Alabaster Caverns State Park, near Freedom, Oklahoma, is home to a natural gypsum cave in which much of the gypsum is in the form of alabaster. There are several types of alabaster found at the site, including pink, white, and the rare black alabaster.
See also.
Window and roof panels.
Chronological list of examples:
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Ahab
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Ahab (; ; ; ; ) was a king of the Kingdom of Israel (Samaria), the son and successor of King Omri, and the husband of Jezebel of Sidon, according to the Hebrew Bible. He is depicted in the Bible as a Baal worshipper and is criticized for causing moral decline in Israel, though modern scholars argue that Ahab was a Yahwist himself.
The existence of Ahab is historically supported outside the Bible. The contemporary Kurkh Monolith inscription of king Shalmaneser III from the Neo-Assyrian Empire documented in 853 BC that Shalmaneser III defeated an alliance of a dozen kings in the Battle of Qarqar; one of these was Ahab. Though not named, he is also mentioned on the inscriptions of the Mesha Stele.
Ahab became king of Israel in the thirty-eighth year of King Asa of Judah, and reigned for twenty-two years, according to 1 Kings 16:29. William F. Albright dated his reign to 869–850 BC, while Edwin R. Thiele offered the dates 874–853 BC. Most recently, Michael Coogan has dated Ahab's reign to 871–852 BC.
Reign.
As Omri's successor, Ahab married Jezebel, the daughter of Ithobaal I of Tyre. Under Jezebel's influence, he abandoned Yahweh and established Baal and Asherah cults in Israel according to 1 Kings 16:29–33. For example, he allowed Hiel the Bethelite to rebuild Jericho, even though it was 'cursed' by Yahweh (1 Kings 16:34), and helped his wife kill opponents, such as the "servants of Yahweh" and possibly, the priests of Jeroboam's cult (1 Kings 18:3–16). Edward Lipiński argues that the "Baal" worshipped by Ahab and Jezebel was the "YHWH of Samaria", which was opposed as Yahwist heresy by the Judean priests. Others disagree based on archaeological evidence and extrabiblical sources about Jezebel's upbringing.
In terms of foreign policy, Ahab continued Omri's policies against Moab, which was a tributary state of Israel (2 Kings 1:1). According to the Moabite Mesha Stele, Omri and Ahab "oppressed Moab for many days". By marriage, he allied with Jehoshaphat, who was the king of Judah (2 Kings 8:16–18). Aram-Damascus was the only foreign state that Ahab opposed but he made peace with them after their king promised to withdraw from conquered territory. He also allowed Ahab to conquer Aramean territory to compensate (1 Kings 20:34).
Battle of Qarqar.
The Battle of Qarqar is mentioned in extra-biblical records, and occurred at Apamea, where Shalmaneser III of Assyria fought a great confederation of princes from Cilicia, northern Syria, Israel, Ammon, and the tribes of the Syrian desert (853 BCE), including Arabs, Ahab the Israelite ("A-ha-ab-bu matSir-'a-la-a-a") and Hadadezer ("Adad-'idri").
Ahab's contribution was estimated at 2,000 chariots and 10,000 men. In reality, however, the number of chariots in Ahab's forces was probably closer to a number in the hundreds (based upon archaeological excavations of the area and the foundations of stables that have been found). If, however, the numbers are referring to allies, they could include forces from Tyre, Judah, Edom, and Moab. The Assyrian king claimed victory, but his immediate return and subsequent expeditions in 849 BC and 846 BC against a similar but unspecified coalition implied that the victory had no lasting impact.
Jezreel was identified as Ahab's fortified chariot and cavalry base.
Ahab and the prophets.
In the Biblical text, Ahab has four important encounters with prophets:
Death of Ahab.
Ahab is mortally wounded by an unaimed arrow after he and Jehoshaphat tried to re-capture Ramoth-Gilead from the Arameans. Depending on translation, Ahab's corpse was licked by dogs or a combination of dogs and pigs, according to Elijah's prophecy. It marked his "uncleanliness" in the presence of Israelites, who abstained from pork consumption.
Legacy.
Ahab's reign was deeply unpopular among Yahwists and was considered to be worse than the previous kings of Israel. Whilst the previous kings followed a "heretical" interpretation of Yahwism, known as the "sins of Jeroboam", Ahab institutionalized Baalism, which was completely divorced from Yahwism. He was likewise criticized for his oppressive policies, both domestically and by the Moabites.
However, Yahwists commend him for fortifying numerous Israelite cities and building an ivory palace. Christian Frevel argues that Ahab used imperialism to introduce Yahweh to the Kingdom of Judah. To do this, he gave his children theophoric names whilst expanding in northern territories and Judah. Michael J. Stahl clarifies that this mostly occurred in the latter half of his reign, according to biblical and extrabiblical evidence.
In Rabbinic literature.
Ahab was one of the three or four wicked kings of Israel singled out by tradition as being excluded from the future world of bliss (Sanh. x. 2; Tosef., Sanh. xii. 11). Midrash Konen places him in the fifth department of Gehenna, as having the heathen under his charge. Though held up as a warning to sinners, Ahab is also described as displaying noble traits of character (Sanh. 102b; Yer. Sanh. xi. 29b). Talmudic literature represents him as an enthusiastic idolater who left no hilltop in the Land of Israel without an idol before which he bowed, and to which he or his wife, Jezebel, brought his weight in gold as a daily offering. So defiant in his apostasy was he that he had inscribed on all the doors of the city of Samaria the words, "Ahab hath abjured the living God of Israel." Nevertheless, he paid great respect to the representatives of learning, "to the Torah given in twenty-two letters," for which reason he was permitted to reign for twenty-two successive years. He generously supported the students of the Law out of his royal treasury, in consequence of which half his sins were forgiven him. A type of worldliness (Ber. 61b), the Crœsus of his time, he was, according to ancient tradition (Meg. 11a), ruler over the whole world. Two hundred and thirty subject kings had initiated a rebellion; but he brought their sons as hostages to Samaria and Jerusalem. All the latter turned from idolaters into worshipers of the God of Israel (Tanna debe Eliyahu, i. 9). Each of his seventy sons had an ivory palace built for him. Since, however, it was Ahab's idolatrous wife who was the chief instigator of his crimes (B. M. 59a), some of the ancient teachers gave him the same position in the world to come as a sinner who had repented (Sanh. 104b, Num. R. xiv). Like Manasseh, he was made a type of repentance (I Kings, xxi. 29). Accordingly, he is described as undergoing fasts and penances for a long time; praying thrice a day to God for forgiveness, until his prayer was heard (PirḲe R. El. xliii). Hence, the name of Ahab in the list of wicked kings was changed to Ahaz (Yer. Sanh. x. 28b; Tanna debe Eliyahu Rabba ix, Zuṭṭa xxiv.).
Pseudo-Epiphanius ("Opera," ii. 245) makes Micah an Ephraimite. Confounding him with Micaiah, son of Imlah, he states that Micah, for his inauspicious prophecy, was killed by order of Ahab through being thrown from a precipice, and was buried at Morathi (Maroth?; Mic. i. 12), near the cemetery of Enakim (Ένακεὶμ Septuagint rendering of ; ib. i. 10). According to "Gelilot Ereẓ Yisrael" (quoted in "Seder ha-Dorot," i. 118, Warsaw, 1889), Micah was buried in Chesil, a town in southern Judah (Josh. xv. 30). Naboth's soul was the lying spirit that was permitted to deceive Ahab to his death.
In popular culture.
Ahab is portrayed by Eduard Franz in the film "Sins of Jezebel" (1953). He is also the namesake of Captain Ahab in "Moby Dick" by Herman Melville.
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ASIC (disambiguation)
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In the realm of electronic technology, ASIC stands for application-specific integrated circuit, an integrated circuit customized for a specific task.
ASIC may also refer to:
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1392
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1712026
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Dasyproctidae
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Dasyproctidae is a family of large South American rodents, comprising the agoutis and acouchis. Their fur is a reddish or dark colour above, with a paler underside. They are herbivorous, often feeding on ripe fruit that falls from trees. They live in burrows, and, like squirrels, will bury some of their food for later use.
Dasyproctids exist in Central and South America, which are the tropical parts of the New World. The fossil record of this family can be traced back to the Late Oligocene (Deseadan in the SALMA classification).
As with all rodents, members of this family have incisors, pre-molars, and molars, but no canines. The cheek teeth are hypsodont and flat-crowned.
Classification.
Fossil taxa follow McKenna and Bell, with modifications following Kramarz.
The pacas (genus "Cuniculus") are placed by some authorities in Dasyproctidae, but molecular studies have demonstrated they do not form a monophyletic group.
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Algol
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Algol , designated Beta Persei (β Persei, abbreviated Beta Per, β Per), known colloquially as the Demon Star, is a bright multiple star in the constellation of Perseus and one of the first non-nova variable stars to be discovered.
Algol is a three-star system, consisting of Beta Persei Aa1, Aa2, and Ab – in which the hot luminous primary β Persei Aa1 and the larger, but cooler and fainter, β Persei Aa2 regularly pass in front of each other, causing eclipses. Thus Algol's magnitude is usually near-constant at 2.1, but regularly dips to 3.4 every 2.86 days during the roughly 10-hour-long partial eclipses. The secondary eclipse when the brighter primary star occults the fainter secondary is very shallow and can only be detected photoelectrically.
Algol gives its name to its class of eclipsing variable, known as Algol variables.
Observation history.
An ancient Egyptian calendar of lucky and unlucky days composed some 3,200 years ago is said to be the oldest historical documentation of the discovery of Algol.
The association of Algol with a demon-like creature (Gorgon in the Greek tradition, ghoul in the Arabic tradition) suggests that its variability was known long before the 17th century, but there is still no indisputable evidence for this. The Arabic astronomer al-Sufi said nothing about any variability of the star in his "Book of Fixed Stars" published c.964.
The variability of Algol was noted in 1667 by Italian astronomer Geminiano Montanari, but the periodic nature of its variations in brightness was not recognized until more than a century later, when the British amateur astronomer John Goodricke also proposed a mechanism for the star's variability. In May 1783, he presented his findings to the Royal Society, suggesting that the periodic variability was caused by a dark body passing in front of the star (or else that the star itself has a darker region that is periodically turned toward the Earth). For his report he was awarded the Copley Medal.
In 1881, the Harvard astronomer Edward Charles Pickering presented evidence that Algol was actually an eclipsing binary. This was confirmed a few years later, in 1889, when the Potsdam astronomer Hermann Carl Vogel found periodic doppler shifts in the spectrum of Algol, inferring variations in the radial velocity of this binary system. Thus, Algol became one of the first known spectroscopic binaries. Joel Stebbins at the University of Illinois Observatory used an early selenium cell photometer to produce the first-ever photoelectric study of a variable star. The light curve revealed the second minimum and the reflection effect between the two stars. Some difficulties in explaining the observed spectroscopic features led to the conjecture that a third star may be present in the system; four decades later this conjecture was found to be correct.
System.
Algol is a multiple-star system with three confirmed and two suspected stellar components. From the point of view of the Earth, Algol Aa1 and Algol Aa2 form an eclipsing binary because their orbital plane contains the line of sight to the Earth. The eclipsing binary pair is separated by only 0.062 astronomical units (au) from each other, whereas the third star in the system (Algol Ab) is at an average distance of 2.69 au from the pair, and the mutual orbital period of the trio is 681 Earth days. The total mass of the system is about 5.8 solar masses, and the mass ratios of Aa1, Aa2, and Ab are about 4.5 to 1 to 2.
The three components of the bright triple star used to be, and still sometimes are, referred to as β Per A, B, and C. The Washington Double Star Catalog lists them as Aa1, Aa2, and Ab, with two very faint stars B and C about one arcmin distant. A further five faint stars are also listed as companions.
The close pair consists of a B8 main sequence star and a much less massive K0 subgiant, which is highly distorted by the more massive star. These two orbit every 2.9 days and undergo the eclipses that cause Algol to vary in brightness. The third star orbits these two every 680 days and is an A or F-type main sequence star. It has been classified as an Am star, but this is now considered doubtful.
Studies of Algol led to the Algol paradox in the theory of stellar evolution: although components of a binary star form at the same time, and massive stars evolve much faster than the less massive stars, the more massive component Algol Aa1 is still in the main sequence, but the less massive Algol Aa2 is a subgiant star at a later evolutionary stage. The paradox can be solved by mass transfer: when the more massive star became a subgiant, it filled its Roche lobe, and most of the mass was transferred to the other star, which is still in the main sequence. In some binaries similar to Algol, a gas flow can be seen. The gas flow between the primary and secondary stars in Algol has been imaged using Doppler Tomography.
This system also exhibits x-ray and radio wave flares. The x-ray flares are thought to be caused by the magnetic fields of the A and B components interacting with the mass transfer. The radio-wave flares might be created by magnetic cycles similar to those of sunspots, but because the magnetic fields of these stars are up to ten times stronger than the field of the Sun, these radio flares are more powerful and more persistent. The secondary component was identified as the radio emitting source in Algol using Very-long-baseline interferometry by Lestrade and co-authors.
Magnetic activity cycles in the chromospherically active secondary component induce changes in its radius of gyration that have been linked to recurrent orbital period variations on the order of ≈ via the Applegate mechanism. Mass transfer between the components is small in the Algol system but could be a significant source of period change in other Algol-type binaries.
The distance to Algol has been measured using very-long baseline interferometry, giving a value of 94 light-years. About 7.3 million years ago it passed within 9.8 light-years of the Solar System and its apparent magnitude was about −2.5, which is considerably brighter than the star Sirius is today. Because the total mass of the Algol system is about 5.8 solar masses, at the closest approach this might have given enough gravity to perturb the Oort cloud of the Solar System somewhat and hence increase the number of comets entering the inner Solar System. However, the actual increase in net cometary collisions is thought to have been quite small.
Names.
"Beta Persei" is the star's Bayer designation.
The official name Algol.
The name "Algol" derives from Arabic "raʾs al-ghūl" : head ("raʾs") of the ogre ("al-ghūl") (see "ghoul"). The English name Demon Star was taken from the Arabic name. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included "Algol" for this star. It is so entered on the IAU Catalog of Star Names.
Ghost and demon star.
Algol was called "Rōsh ha Sāṭān" or "Satan's Head" in Hebrew folklore, as stated by Edmund Chilmead, who called it "Divels head" or "Rosch hassatan". A Latin name for Algol from the 16th century was "Caput Larvae" or "the Spectre's Head". Hipparchus and Pliny made this a separate, though connected, constellation.
First star of Medusa's head.
Earlier the name of the constellation "Perseus" was "Perseus and Medusa's Head" where an asterism representing the head of Medusa after Perseus has cut it off already known in ancient Rome. Medusa is a gorgon so the star is also called "Gorgonea Prima" meaning the first star of the gorgon.
Chinese names.
In Chinese, (), meaning "Mausoleum", refers to an asterism consisting of β Persei, 9 Persei, τ Persei, ι Persei, κ Persei, ρ Persei, 16 Persei and 12 Persei. Consequently, the Chinese name for β Persei itself is (, English: The Fifth Star of Mausoleum.). According to R.H. Allen the star bore the grim name of "Tseih She" (), meaning "Piled up Corpses" but this appears to be a misidentification, and "Dié Shī" is correctly π Persei, which is inside the Mausoleum.
Observing Algol.
The Algol system usually has an apparent magnitude of 2.1, similar to those of Mirfak (α Persei) at 1.9 and Almach (γ Andromedae) at 2.2, with whom it forms a right triangle. During eclipses it dims to 3.4, making it as faint as nearby ρ Persei at 3.3.
Listed are the first eclipse dates and times of each month, with all times in UT. β Persei Aa2 eclipses β Persei Aa1 every 2.867321 days (2 days 20 hours 49 min). To determine subsequent eclipses, add this interval to each listed date and time. For example, the Jan 2 eclipse at 8h will result in consecutive eclipse times on Jan 5 at 5h, Jan 8 at 1h, Jan 10 at 22h, and so on (all times approximate).
Cultural significance.
Historically, the star has received a strong association with bloody violence across a wide variety of cultures. In the "Tetrabiblos", the 2nd-century astrological text of the Alexandrian astronomer Ptolemy, Algol is referred to as "the Gorgon of Perseus" and associated with death by decapitation: a theme which mirrors the myth of the hero Perseus's victory over the snake-haired Gorgon Medusa. In the astrology of fixed stars, Algol is considered one of the unluckiest stars in the sky, and was listed as one of the 15 Behenian stars.
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Amazing Grace
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"Amazing Grace" is a Christian hymn written in 1772 and published in 1779 by English Anglican clergyman and poet John Newton (1725–1807). It is possibly the most sung and most recorded hymn in the world, and especially popular in the United States, where it is used for both religious and secular purposes.
Newton wrote the words from personal experience; he grew up without any particular religious conviction, but his life's path was formed by a variety of twists and coincidences that were often put into motion by others' reactions to what they took as his recalcitrant insubordination. He was pressed into service with the Royal Navy, and after leaving the service, he became involved in the Atlantic slave trade. In 1748, a violent storm battered his vessel off the coast of County Donegal, Ireland, so severely that he called out to God for mercy. While this moment marked his spiritual conversion, he continued slave trading until 1754 or 1755, when he ended his seafaring altogether. Newton began studying Christian theology and later became an abolitionist.
Ordained in the Church of England in 1764, Newton became the curate of Olney, Buckinghamshire, where he began to write hymns with poet William Cowper. "Amazing Grace" was written to illustrate a sermon on New Year's Day of 1773. It is unknown if there was any music accompanying the verses; it may have been chanted by the congregation. It debuted in print in 1779 in Newton's and Cowper's "Olney Hymns", but settled into relative obscurity in England. In the United States, "Amazing Grace" became a popular song used by Baptist and Methodist preachers as part of their evangelizing, especially in the American South, during the Second Great Awakening of the early 19th century. It has been associated with more than 20 melodies. In 1835, American composer William Walker set it to the tune known as "New Britain" in a shape note format; this is the version most frequently sung today.
With the message that forgiveness and redemption are possible regardless of sins committed and that the soul can be delivered from despair through the mercy of God, "Amazing Grace" is one of the most recognisable songs in the English-speaking world. American historian Gilbert Chase writes that it is "without a doubt the most famous of all the folk hymns" and Jonathan Aitken, a Newton biographer, estimates that the song is performed about 10 million times annually.
It has had particular influence in folk music, and has become an emblematic black spiritual. Its universal message has been a significant factor in its crossover into secular music. "Amazing Grace" became newly popular during the 1960s revival of American folk music, and it has been recorded thousands of times during and since the 20th century.
John Newton's conversion.
According to the "Dictionary of American Hymnology", "Amazing Grace" is John Newton's spiritual autobiography in verse.
In 1725, Newton was born in Wapping, a district in London near the Thames. His father was a shipping merchant who was brought up as a Catholic but had Protestant sympathies, and his mother was a devout Independent, unaffiliated with the Anglican Church. She had intended Newton to become a clergyman, but she died of tuberculosis when he was six years old. For the next few years, while his father was at sea Newton was raised by his emotionally distant stepmother. He was also sent to boarding school, where he was mistreated. At the age of eleven, he joined his father on a ship as an apprentice; his seagoing career would be marked by headstrong disobedience.
As a youth, Newton began a pattern of coming very close to death, examining his relationship with God, then relapsing into bad habits. As a sailor, he denounced his faith after being influenced by a shipmate who discussed with him "Characteristicks of Men, Manners, Opinions, Times", a book by the Third Earl of Shaftesbury. In a series of letters Newton later wrote, "Like an unwary sailor who quits his port just before a rising storm, I renounced the hopes and comforts of the Gospel at the very time when every other comfort was about to fail me." His disobedience caused him to be pressed into the Royal Navy, and he took advantage of opportunities to overstay his leave.
He deserted the navy to visit Mary "Polly" Catlett, a family friend with whom he had fallen in love. After enduring humiliation for deserting, he was traded as crew to a slave ship.
He began a career in slave trading.
Newton often openly mocked the captain by creating obscene poems and songs about him, which became so popular that the crew began to join in. His disagreements with several colleagues resulted in his being starved almost to death, imprisoned while at sea, and chained like the slaves they carried. He was himself enslaved by the Sherbro and forced to work on a plantation in Sierra Leone near the Sherbro River. After several months he came to think of Sierra Leone as his home, but his father intervened after Newton sent him a letter describing his circumstances, and crew from another ship happened to find him. Newton claimed the only reason he left Sierra Leone was because of Polly.
While aboard the ship "Greyhound", Newton gained notoriety as being one of the most profane men the captain had ever met. In a culture where sailors habitually swore, Newton was admonished several times for not only using the worst words the captain had ever heard, but creating new ones to exceed the limits of verbal debauchery. In March 1748, while the "Greyhound" was in the North Atlantic, a violent storm came upon the ship that was so rough it swept overboard a crew member who was standing where Newton had been moments before. After hours of the crew emptying water from the ship and expecting to be capsized, Newton and another mate tied themselves to the ship's pump to keep from being washed overboard, working for several hours. After proposing the measure to the captain, Newton had turned and said, "If this will not do, then Lord have mercy upon us!" Newton rested briefly before returning to the deck to steer for the next eleven hours. During his time at the wheel, he pondered his divine challenge.
About two weeks later, the battered ship and starving crew landed in Lough Swilly, Ireland. For several weeks before the storm, Newton had been reading "The Christian's Pattern", a summary of the 15th-century "The Imitation of Christ" by Thomas à Kempis. The memory of his own "Lord have mercy upon us!" uttered during a moment of desperation in the storm did not leave him; he began to ask if he was worthy of God's mercy or in any way redeemable. Not only had he neglected his faith but directly opposed it, mocking others who showed theirs, deriding and denouncing God as a myth. He came to believe that God had sent him a profound message and had begun to work through him.
Newton's conversion was not immediate, but he contacted Polly's family and announced his intention to marry her. Her parents were hesitant as he was known to be unreliable and impetuous. They knew he was profane too but allowed him to write to Polly, and he set to begin to submit to authority for her sake. He sought a place on a slave ship bound for Africa, and Newton and his crewmates participated in most of the same activities he had written about before; the only immorality from which he was able to free himself was profanity. After a severe illness his resolve was renewed, yet he retained the same attitude towards slavery as was held by his contemporaries. Newton continued in the slave trade through several voyages where he sailed the coasts of Africa, now as a captain, and procured slaves being offered for sale in larger ports, transporting them to North America.
In between voyages, he married Polly in 1750, and he found it more difficult to leave her at the beginning of each trip. After three shipping voyages in the slave trade, Newton was promised a position as ship's captain with cargo unrelated to slavery. But at the age of thirty, he collapsed and never sailed again.
Olney curate.
Working as a customs agent in Liverpool starting in 1756, Newton began to teach himself Latin, Greek, and theology. He and Polly immersed themselves in the church community, and Newton's passion was so impressive that his friends suggested he become a priest in the Church of England. He was turned down by John Gilbert, Archbishop of York, in 1758, ostensibly for having no university degree, although the more likely reasons were his leanings toward evangelism and tendency to socialise with Methodists. Newton continued his devotions, and after being encouraged by a friend, he wrote about his experiences in the slave trade and his conversion. William Legge, 2nd Earl of Dartmouth, impressed with his story, sponsored Newton for ordination by John Green, Bishop of Lincoln, and offered him the curacy of Olney, Buckinghamshire, in 1764.
"Olney Hymns".
Olney was a village of about 2,500 residents whose main industry was making lace by hand. The people were mostly illiterate and many of them were poor. Newton's preaching was unique in that he shared many of his own experiences from the pulpit; many clergy preached from a distance, not admitting any intimacy with temptation or sin. He was involved in his parishioners' lives and was much loved, although his writing and delivery were sometimes unpolished. But his devotion and conviction were apparent and forceful, and he often said his mission was to "break a hard heart and to heal a broken heart". He struck a friendship with William Cowper, a gifted writer who had failed at a career in law and suffered bouts of insanity, attempting suicide several times. Cowper enjoyed Olney and Newton's company; he was also new to Olney and had gone through a spiritual conversion similar to Newton's. Together, their effect on the local congregation was impressive. In 1768, they found it necessary to start a weekly prayer meeting to meet the needs of an increasing number of parishioners. They also began writing lessons for children.
Partly from Cowper's literary influence, and partly because learned vicars were expected to write verses, Newton began to try his hand at hymns, which had become popular through the language, made plain for common people to understand. Several prolific hymn writers were at their most productive in the 18th century, including Isaac Watts whose hymns Newton had grown up hearing and Charles Wesley, with whom Newton was familiar. Wesley's brother John, the eventual founder of the Methodist Church, had encouraged Newton to go into the clergy. Watts was a pioneer in English hymn writing, basing his work after the Psalms. The most prevalent hymns by Watts and others were written in the common meter in 8.6.8.6: the first line is eight syllables and the second is six.
Newton and Cowper attempted to present a poem or hymn for each prayer meeting. The lyrics to "Amazing Grace" were written in late 1772 and probably used in a prayer meeting for the first time on 1 January 1773. A collection of the poems Newton and Cowper had written for use in services at Olney was bound and published anonymously in 1779 under the title "Olney Hymns". Newton contributed 280 of the 348 texts in "Olney Hymns"; "1 Chronicles 17:16–17, Faith's Review and Expectation" was the title of the poem with the first line "Amazing grace! (how sweet the sound)".
Critical analysis.
The general impact of "Olney Hymns" was immediate and it became a widely popular tool for evangelicals in Britain for many years. Scholars appreciated Cowper's poetry somewhat more than Newton's plaintive and plain language, expressing his forceful personality. The most prevalent themes in the verses written by Newton in "Olney Hymns" are faith in salvation, wonder at God's grace, his love for Jesus, and his cheerful exclamations of the joy he found in his faith. As a reflection of Newton's connection to his parishioners, he wrote many of the hymns in first person, admitting his own experience with sin. Bruce Hindmarsh in "Sing Them Over Again To Me: Hymns and Hymnbooks in America" considers "Amazing Grace" an excellent example of Newton's testimonial style afforded by the use of this perspective. Several of Newton's hymns were recognised as great work ("Amazing Grace" was not among them), while others seem to have been included to fill in when Cowper was unable to write. Jonathan Aitken calls Newton, specifically referring to "Amazing Grace", an "unashamedly middlebrow lyricist writing for a lowbrow congregation", noting that only twenty-one of the nearly 150 words used in all six verses have more than one syllable.
William Phipps in the "Anglican Theological Review" and author James Basker have interpreted the first stanza of "Amazing Grace" as evidence of Newton's realisation that his participation in the slave trade was his wretchedness, perhaps representing a wider common understanding of Newton's motivations. Newton joined forces with William Wilberforce, the British Member of Parliament who led the Parliamentarian campaign to abolish the slave trade in the British Empire, culminating in the Slave Trade Act 1807. But Newton did not become an ardent and outspoken abolitionist until after he left Olney in the 1780s; he is not known to have connected writing the hymn known as "Amazing Grace" to anti-slavery sentiments.
The lyrics in "Olney Hymns" were arranged by their association to the Biblical verses that would be used by Newton and Cowper in their prayer meetings, and did not address any political objective. For Newton, the beginning of the year was a time to reflect on one's spiritual progress. At the same time he completed a diary which has since been lost that he had begun 17 years before, two years after he quit sailing. The last entry of 1772 was a recounting of how much he had changed since then.
The title ascribed to the hymn, "1 Chronicles 17:16–17", refers to David's reaction to the prophet Nathan telling him that God intends to maintain his family line forever. Some Christians interpret this as a prediction that Jesus Christ, as a descendant of David, was promised by God as the salvation for all people. Newton's sermon on that January day in 1773 focused on the necessity to express one's gratitude for God's guidance, that God is involved in the daily lives of Christians though they may not be aware of it, and that patience for deliverance from the daily trials of life is warranted when the glories of eternity await. Newton saw himself a sinner like David who had been chosen, perhaps undeservedly, and was humbled by it. According to Newton, unconverted sinners were "blinded by the god of this world" until "mercy came to us not only undeserved but undesired ... our hearts endeavored to shut him out till he overcame us by the power of his grace."
The New Testament served as the basis for many of the lyrics of "Amazing Grace". The first verse, for example, can be traced to the story of the Prodigal Son. In the Gospel of Luke the father says, "For this son of mine was dead and is alive again; he was lost, and is found". The story of Jesus healing a blind man who tells the Pharisees that he can now see is told in the Gospel of John. Newton used the words "I was blind but now I see" and declared "Oh to grace how great a debtor!" in his letters and diary entries as early as 1752. The effect of the lyrical arrangement, according to Bruce Hindmarsh, allows an instant release of energy in the exclamation "Amazing grace!", to be followed by a qualifying reply in "how sweet the sound". In "An Annotated Anthology of Hymns", Newton's use of an exclamation at the beginning of his verse is called "crude but effective" in an overall composition that "suggest(s) a forceful, if simple, statement of faith". Grace is recalled three times in the following verse, culminating in Newton's most personal story of his conversion, underscoring the use of his personal testimony with his parishioners.
The sermon preached by Newton was his last of those that William Cowper heard in Olney, since Cowper's mental instability returned shortly thereafter. One author suggests Newton may have had his friend in mind, employing the themes of assurance and deliverance from despair for Cowper's benefit.
Dissemination.
More than 60 of Newton and Cowper's hymns were republished in other British hymnals and magazines, but "Amazing Grace" was not, appearing only once in a 1780 hymnal sponsored by the Countess of Huntingdon. Scholar John Julian commented in his 1892 "A Dictionary of Hymnology" that outside of the United States, the song was unknown and it was "far from being a good example of Newton's finest work". Between 1789 and 1799, four variations of Newton's hymn were published in the US in Baptist, Dutch Reformed, and Congregationalist hymnodies; by 1830 Presbyterians and Methodists also included Newton's verses in their hymnals.
Although it had its roots in England, "Amazing Grace" became an integral part of the Christian tapestry in the United States. The greatest influences in the 19th century that propelled "Amazing Grace" to spread across the US and become a staple of religious services in many denominations and regions were the Second Great Awakening and the development of shape note singing communities. A tremendous religious movement swept the US in the early 19th century, marked by the growth and popularity of churches and religious revivals that got their start on the frontier in Kentucky and Tennessee. Unprecedented gatherings of thousands of people attended camp meetings where they came to experience salvation; preaching was fiery and focused on saving the sinner from temptation and backsliding. Religion was stripped of ornament and ceremony, and made as plain and simple as possible; sermons and songs often used repetition to get across to a rural population of poor and mostly uneducated people the necessity of turning away from sin. Witnessing and testifying became an integral component to these meetings, where a congregation member or stranger would rise and recount his turn from a sinful life to one of piety and peace. "Amazing Grace" was one of many hymns that punctuated fervent sermons, although the contemporary style used a refrain, borrowed from other hymns, that employed simplicity and repetition such as:
Simultaneously, an unrelated movement of communal singing was established throughout the South and Western states. A format of teaching music to illiterate people appeared in 1800. It used four syllables to distinguish the intervals of the major scale: fa-sol-la-fa-sol-la-mi-fa. Each syllable was associated with a specifically shaped note, and thus the use of books printed in this format became known as shape note singing. The method was simple to learn and teach, and schools were established throughout the South and West. Communities would come together for an entire day of singing in a large building where they sat in four distinct areas surrounding an open space, one member directing the entire gathering. Some groups sang outdoors, on benches set up in a square. Preachers used shape note music to teach hymns to people on the frontier and to raise the emotion of camp meetings. Most of the music was Christian, but the purpose of communal singing was not primarily spiritual. Communities either could not afford instruments for accompaniment, or rejected their use due to a Calvinistic sense of simplicity, so the songs were sung a cappella.
"New Britain" tune.
When originally used in Olney, it is unknown what music, if any, accompanied the verses written by John Newton. Contemporary hymnbooks did not contain music and were simply small books of religious poetry. The first known instance of Newton's lines joined to music was in "A Companion to the Countess of Huntingdon's Hymns" (London, 1808), where it is set to the tune "Hephzibah" by English composer John Jenkins Husband. Common meter hymns were interchangeable with a variety of tunes; more than twenty musical settings of "Amazing Grace" circulated with varying popularity until 1835, when American composer William Walker assigned Newton's words to a traditional song named "New Britain". This was an amalgamation of two melodies ("Gallaher" and "St. Mary"), first published in the "Columbian Harmony" by Charles H. Spilman and Benjamin Shaw (Cincinnati, 1829). Spilman and Shaw, both students at Kentucky's Centre College, compiled their tunebook both for public worship and revivals, to satisfy "the wants of the Church in her triumphal march". Most of the tunes had been previously published, but "Gallaher" and "St. Mary" had not. As neither tune is attributed and both show elements of oral transmission, scholars can only speculate that they are possibly of British origin. A manuscript from 1828 by Lucius Chapin, a famous hymn writer of that time, contains a tune very close to "St. Mary", but that does not mean that he wrote it.
"Amazing Grace", with the words written by Newton and joined with "New Britain", the melody most currently associated with it, appeared for the first time in Walker's shape note tunebook "Southern Harmony" in 1847. It was, according to author Steve Turner, a "marriage made in heaven ... The music behind 'amazing' had a sense of awe to it. The music behind 'grace' sounded graceful. There was a rise at the point of confession, as though the author was stepping out into the open and making a bold declaration, but a corresponding fall when admitting his blindness." Walker's collection was enormously popular, selling about 600,000 copies all over the US when the total population was just over 20 million. Another shape note tunebook named "The Sacred Harp" (1844) by Georgia residents Benjamin Franklin White and Elisha J. King became widely influential and continues to be used.
Another verse was first recorded in Harriet Beecher Stowe's immensely influential 1852 anti-slavery novel "Uncle Tom's Cabin". Three verses were emblematically sung by Tom in his hour of deepest crisis. He sings the sixth and fifth verses in that order, and Stowe included another verse, not written by Newton, that had been passed down orally in African-American communities for at least 50 years. It was one of between 50 and 70 verses of a song titled "Jerusalem, My Happy Home", which was first published in a 1790 book called "A Collection of Sacred Ballads":
"Amazing Grace" came to be an emblem of a Christian movement and a symbol of the US itself as the country was involved in a great political experiment, attempting to employ democracy as a means of government. Shape-note singing communities, with all the members sitting around an open center, each song employing a different song leader, illustrated this in practice. Simultaneously, the US began to expand westward into previously unexplored territory that was often wilderness. The "dangers, toils, and snares" of Newton's lyrics had both literal and figurative meanings for Americans. This became poignantly true during the most serious test of American cohesion in the U.S. Civil War (1861–1865). "Amazing Grace", set to "New Britain", was included in two hymnals distributed to soldiers. With death so real and imminent, religious services in the military became commonplace. The hymn was translated into other languages as well: while on the Trail of Tears, the Cherokee sang Christian hymns as a way of coping with the ongoing tragedy, and a version of the song by Samuel Worcester that had been translated into the Cherokee language became very popular.
Urban revival.
Although "Amazing Grace" set to "New Britain" was popular, other versions existed regionally. Primitive Baptists in the Appalachian region often used "New Britain" with other hymns, and sometimes sing the words of "Amazing Grace" to other folk songs, including titles such as "In the Pines", "Pisgah", "Primrose", and "Evan", as all are able to be sung in common meter, of which the majority of their repertoire consists. In the late 19th century, Newton's verses were sung to a tune named "Arlington" as frequently as to "New Britain" for a time.
Two musical arrangers named Dwight Moody and Ira Sankey heralded another religious revival in the cities of the US and Europe, giving the song international exposure. Moody's preaching and Sankey's musical gifts were significant; their arrangements were the forerunners of gospel music, and churches all over the US were eager to acquire them. Moody and Sankey began publishing their compositions in 1875, and "Amazing Grace" appeared three times with three different melodies, but they were the first to give it its title; hymns were typically published using the incipits (first line of the lyrics), or the name of the tune such as "New Britain". Publisher Edwin Othello Excell gave the version of "Amazing Grace" set to "New Britain" immense popularity by publishing it in a series of hymnals that were used in urban churches. Excell altered some of Walker's music, making it more contemporary and European, giving "New Britain" some distance from its rural folk-music origins. Excell's version was more palatable for a growing urban middle class and arranged for larger church choirs. Several editions featuring Newton's first three stanzas and the verse previously included by Harriet Beecher Stowe in "Uncle Tom's Cabin" were published by Excell between 1900 and 1910. His version of "Amazing Grace" became the standard form of the song in American churches.
Recorded versions.
With the advent of recorded music and radio, "Amazing Grace" began to cross over from primarily a gospel standard to secular audiences. The ability to record combined with the marketing of records to specific audiences allowed "Amazing Grace" to take on thousands of different forms in the 20th century. Where Edwin Othello Excell sought to make the singing of "Amazing Grace" uniform throughout thousands of churches, records allowed artists to improvise with the words and music specific to each audience. AllMusic lists over 1,000 recordings – including re-releases and compilations – as of 2019.
Its first recording is an a cappella version from 1922 by the Sacred Harp Choir.
It was included from 1926 to 1930 in Okeh Records' catalogue, which typically concentrated strongly on blues and jazz. Demand was high for black gospel recordings of the song by H. R. Tomlin and J. M. Gates. A poignant sense of nostalgia accompanied the recordings of several gospel and blues singers in the 1940s and 1950s who used the song to remember their grandparents, traditions, and family roots. It was recorded with musical accompaniment for the first time in 1930 by Fiddlin' John Carson, although to another folk hymn named "At the Cross", not to "New Britain". "Amazing Grace" is emblematic of several kinds of folk music styles, often used as the standard example to illustrate such musical techniques as lining out and call and response, that have been practised in both black and white folk music.
Mahalia Jackson's 1947 version received significant radio airplay, and as her popularity grew throughout the 1950s and 1960s, she often sang it at public events such as concerts at Carnegie Hall. Author James Basker states that the song has been employed by African Americans as the "paradigmatic Negro spiritual" because it expresses the joy felt at being delivered from slavery and worldly miseries. Anthony Heilbut, author of "The Gospel Sound", states that the "dangers, toils, and snares" of Newton's words are a "universal testimony" of the African American experience.
During the civil rights movement and opposition to the Vietnam War, the song took on a political tone. Mahalia Jackson employed "Amazing Grace" for Civil Rights marchers, writing that she used it "to give magical protection a charm to ward off danger, an incantation to the angels of heaven to descend ... I was not sure the magic worked outside the church walls ... in the open air of Mississippi. But I wasn't taking any chances." Folk singer Judy Collins, who knew the song before she could remember learning it, witnessed Fannie Lou Hamer leading marchers in Mississippi in 1964, singing "Amazing Grace". Collins also considered it a talisman of sorts, and saw its equal emotional impact on the marchers, witnesses, and law enforcement who opposed the civil rights demonstrators. According to fellow folk singer Joan Baez, it was one of the most requested songs from her audiences, but she never realised its origin as a hymn; by the time she was singing it in the 1960s she said it had "developed a life of its own". It even made an appearance at the Woodstock Music Festival in 1969 during Arlo Guthrie's performance.
Collins decided to record it in the late 1960s amid an atmosphere of counterculture introspection; she was part of an encounter group that ended a contentious meeting by singing "Amazing Grace" as it was the only song to which all the members knew the words. Her producer was present and suggested she include a version of it on her 1970 album "Whales & Nightingales". Collins, who had a history of alcohol abuse, claimed that the song was able to "pull her through" to recovery. It was recorded in St. Paul's, the chapel at Columbia University, chosen for the acoustics. She chose an "a cappella" arrangement that was close to Edwin Othello Excell's, accompanied by a chorus of amateur singers who were friends of hers. Collins connected it to the Vietnam War, to which she objected: "I didn't know what else to do about the war in Vietnam. I had marched, I had voted, I had gone to jail on political actions and worked for the candidates I believed in. The war was still raging. There was nothing left to do, I thought ... but sing 'Amazing Grace'." Gradually and unexpectedly, the song began to be played on the radio, and then be requested. It rose to number 15 on the "Billboard" Hot 100, remaining on the charts for 15 weeks, as if, she wrote, her fans had been "waiting to embrace it". In the UK, it charted 8 times between 1970 and 1972, peaking at number 5 and spending a total of 75 weeks on popular music charts. Her rendition also reached number 5 in New Zealand and number 12 in Ireland in 1971.
In 1972, the Royal Scots Dragoon Guards, the senior Scottish regiment of the British Army, recorded an instrumental version featuring a bagpipe soloist accompanied by a pipe band. The tempo of their arrangement was slowed to allow for the bagpipes, but it was based on Collins's: it began with a bagpipe solo introduction similar to her lone voice, then it was accompanied by the band of bagpipes and horns, whereas in her version she is backed up by a chorus. It became an international hit, spending five weeks at number-one in the UK Singles Chart, topping the "RPM" national singles chart in Canada for three weeks, and also peaking at number 11 on the Billboard Hot 100 in the US. It is also a controversial instrumental, as it combined pipes with a military band. The Pipe Major of the Royal Scots Dragoon Guards was summoned to Edinburgh Castle and chastised for demeaning the bagpipes.
Aretha Franklin and Rod Stewart also recorded "Amazing Grace" around the same time, and both of their renditions were popular. All four versions were marketed to distinct types of audiences, thereby assuring its place as a pop song. Johnny Cash recorded it on his 1975 album "Sings Precious Memories", dedicating it to his older brother Jack, who had been killed in a mill accident when they were boys in Dyess, Arkansas. Cash and his family sang it to themselves while they worked in the cotton fields following Jack's death. Cash often included the song when he toured prisons, saying "For the three minutes that song is going on, everybody is free. It just frees the spirit and frees the person."
The U.S. Library of Congress has a collection of 3,000 versions of and songs inspired by "Amazing Grace", some of which were first-time recordings by folklorists Alan and John Lomax, a father and son team who in 1932 travelled thousands of miles across the southern states of the US to capture the different regional styles of the song. More contemporary renditions include samples from such popular artists as Sam Cooke and the Soul Stirrers (1963), the Byrds (1970), Elvis Presley (1971), Skeeter Davis (1972), Mighty Clouds of Joy (1972), Amazing Rhythm Aces (1975), Willie Nelson (1976) and the Lemonheads (1992).
In American popular culture.
"Amazing Grace" is an icon in American culture that has been used for a variety of secular purposes and marketing campaigns. It is referenced in the 2006 film "Amazing Grace", which highlights Newton's influence on the leading British abolitionist William Wilberforce, in the film biography of Newton, "Newton's Grace", and the 2014 film "Freedom" which tells the story of Newton's composition of the hymn.
Since 1954, when an organ instrumental of "New Britain" became a best-seller, "Amazing Grace" has been associated with funerals and memorial services. The hymn has become a song that inspires hope in the wake of tragedy, becoming a sort of "spiritual national anthem" according to authors Mary Rourke and Emily Gwathmey. For example, President Barack Obama recited and later sang the hymn at the memorial service for Clementa Pinckney, who was one of the nine victims of the Charleston church shooting in 2015.
Modern interpretations.
In recent years, the words of the hymn have been changed in some religious publications to downplay a sense of imposed self-loathing by its singers. The second line, "That saved a wretch like me!" has been rewritten as "That saved and strengthened me", "save a soul like me", or "that saved and set me free". Kathleen Norris in her book "Amazing Grace: A Vocabulary of Faith" characterises this transformation of the original words as "wretched English" making the line that replaces the original "laughably bland". Part of the reason for this change has been the altered interpretations of what wretchedness and grace means. Newton's Calvinistic view of redemption and divine grace formed his perspective that he considered himself a sinner so vile that he was unable to change his life or be redeemed without God's help. Yet his lyrical subtlety, in Steve Turner's opinion, leaves the hymn's meaning open to a variety of Christian and non-Christian interpretations. "Wretch" also represents a period in Newton's life when he saw himself outcast and miserable, as he was when he was enslaved in Sierra Leone; his own arrogance was matched by how far he had fallen in his life.
Due to its immense popularity and iconic nature, the meaning behind the words of "Amazing Grace" has become as individual as the singer or listener. Bruce Hindmarsh suggests that the secular popularity of "Amazing Grace" is due to the absence of any mention of God in the lyrics until the fourth verse (by Excell's version, the fourth verse begins "When we've been there ten thousand years"), and that the song represents the ability of humanity to transform itself instead of a transformation taking place at the hands of God. "Grace", however, had a clearer meaning to John Newton, as he used the word to represent God or the power of God.
The transformative power of the song was investigated by journalist Bill Moyers in a documentary released in 1990. Moyers was inspired to focus on the song's power after watching a performance at Lincoln Center, where the audience consisted of Christians and non-Christians, and he noticed that it had an equal impact on everybody in attendance, unifying them. James Basker also acknowledged this force when he explained why he chose "Amazing Grace" to represent a collection of anti-slavery poetry: "there is a transformative power that is applicable ... : the transformation of sin and sorrow into grace, of suffering into beauty, of alienation into empathy and connection, of the unspeakable into imaginative literature."
Moyers interviewed Collins, Cash, opera singer Jessye Norman, Appalachian folk musician Jean Ritchie and her family, white Sacred Harp singers in Georgia, black Sacred Harp singers in Alabama, and a prison choir at the Texas State Penitentiary at Huntsville. Collins, Cash, and Norman were unable to discern if the power of the song came from the music or the lyrics. Norman, who once notably sang it at the end of a large outdoor rock concert for Nelson Mandela's 70th birthday, stated, "I don't know whether it's the text I don't know whether we're talking about the lyrics when we say that it touches so many people or whether it's that tune that everybody knows." A prisoner interviewed by Moyers explained his literal interpretation of the second verse: "'Twas grace that taught my heart to fear, and grace my fears relieved" by saying that the fear became immediately real to him when he realised he may never get his life in order, compounded by the loneliness and restriction in prison. Gospel singer Marion Williams summed up its effect: "That's a song that gets to everybody".
The "Dictionary of American Hymnology" claims it is included in more than a thousand published hymnals, and recommends its use for "occasions of worship when we need to confess with joy that we are saved by God's grace alone; as a hymn of response to forgiveness of sin or as an assurance of pardon; as a confession of faith or after the sermon".
<score sound="1"> % Adding least one space before each line is recommended
\new PianoStaff « \new Staff \relative c"
{ \set Staff.midiInstrument = #"violin" \clef treble \key g \major \tempo 8 = 126 \time 3/4
% --------------------Start "violin" part
r4 r4 d,4 % 1
g2 b8( g8) % 2
b2 a4 % 3
g2 e4 % 4
d2 d4 % 5
g2 b8( g8) % 6
b2 a4 % 7
d2 b4 % 8
d4.( b8) d8( b8) % 9
g2 d4 % 10
e4.( g8 ) g8( e8)% 11
d2 d4 % 12
g2 b8( g8) % 13
b2 a4 % 14
g2. \bar ":|." % 15
} % -------------------end "violin" part
\addlyrics
\new Staff \relative c {
\set Staff.midiInstrument = #"violin" \clef bass \key g \major \time 3/4
r4 r4 <g g' b> % 1 A
<g d' b'>2 <g g' d'>8 8 % 2 mazing
<d g d'>2 <d fs c'>4 % 3 grace h ow
<e g b>2 <c g c'>4 % 4 sweet the
<g g' b>2 <g g' b>4 % 5 sound that
<g d' b'>2 <g g' d'>8 8 % 6 saved a
<d g d'>2 <c fs d'>4 % 7 wretch like
2 <g g' d'>4 % 8 me I
<g' b d>2 <g d'>4 % 9 once was
2 4 % 10 lost but
<c g' c>2 <c e c'>8 <c g' c>8 % 11 now am
<g g' b>2 4 % 12 found, was
<e g b>2 <d g d'>4 % 13 blind, but
<d g d'>2 <d fs c'>4 % 14 now I
<g, g' b>2. % 15 see
} » }</score>
Further reading.
Walvin, James. "Amazing Grace: A Cultural History of the Beloved Hymn." Oakland, California: University of California Press, 2023.
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AOL
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AOL (formerly a company known as AOL Inc. and originally known as America Online) is an American web portal and online service provider based in New York City, and a brand marketed by Yahoo! Inc.
The service traces its history to an online service known as PlayNET. PlayNET licensed its software to Quantum Link (Q-Link), which went online in November 1985. A new IBM PC client was launched in 1988, and eventually renamed as America Online in 1989. AOL grew to become the largest online service, displacing established players like CompuServe and The Source. By 1995, AOL had about three million active users.
AOL was at one point the most recognized brand on the Web in the United States. AOL once provided a dial-up Internet service to millions of Americans and pioneered instant messaging and chat rooms with AOL Instant Messenger (AIM). In 1998, AOL purchased Netscape for US$4.2 billion. By 2000, AOL was providing internet service to over 20 million consumers, dominating the market of Internet service providers (ISPs). In 2001, at the height of its popularity, it purchased the media conglomerate Time Warner in the largest merger in US history. AOL shrank rapidly thereafter, partly due to the decline of dial-up and rise of broadband. AOL was eventually spun off from Time Warner in 2009, with Tim Armstrong appointed the new CEO. Under his leadership, the company invested in media brands and advertising technologies.
On June 23, 2015, AOL was acquired by Verizon Communications for $4.4 billion. On May 3, 2021, Verizon announced it would sell Yahoo and AOL to private equity firm Apollo Global Management for $5 billion. On September 1, 2021, AOL became part of the new Yahoo! Inc.
History.
1983–1991: early years.
AOL began in 1983, as a short-lived venture called Control Video Corporation (CVC), founded by William von Meister. Its sole product was an online service called GameLine for the Atari 2600 video game console, after von Meister's idea of buying music on demand was rejected by Warner Bros. Subscribers bought a modem from the company for $49.95 and paid a one-time $15 setup fee. GameLine permitted subscribers to temporarily download games and keep track of high scores, at a cost of $1 per game. The telephone disconnected and the downloaded game would remain in GameLine's Master Module, playable until the user turned off the console or downloaded another game.
In January 1983, Steve Case was hired as a marketing consultant for Control Video on the recommendation of his brother, investment banker Dan Case. In May 1983, Jim Kimsey became a manufacturing consultant for Control Video, which was near bankruptcy. Kimsey was brought in by his West Point friend Frank Caufield, an investor in the company. In early 1985, von Meister left the company.
On May 24, 1985, Quantum Computer Services, an online services company, was founded by Kimsey from the remnants of Control Video, with Kimsey as chief executive officer and Marc Seriff as chief technology officer. The technical team consisted of Seriff, Tom Ralston, Ray Heinrich, Steve Trus, Ken Huntsman, Janet Hunter, Dave Brown, Craig Dykstra, Doug Coward, and Mike Ficco. In 1987, Case was promoted again to executive vice-president. Kimsey soon began to groom Case to take over the role of CEO, which he did when Kimsey retired in 1991.
Kimsey changed the company's strategy, and in 1985, launched a dedicated online service for Commodore 64 and 128 computers, originally called Quantum Link ("Q-Link" for short). The Quantum Link software was based on software licensed from PlayNet, Inc., which was founded in 1983 by Howard Goldberg and Dave Panzl. The service was different from other online services as it used the computing power of the Commodore 64 and the Apple II rather than just a "dumb" terminal. It passed tokens back and forth and provided a fixed-price service tailored for home users. In May 1988, Quantum and Apple launched AppleLink Personal Edition for Apple II and Macintosh computers. In August 1988, Quantum launched PC Link, a service for IBM-compatible PCs developed in a joint venture with the Tandy Corporation. After the company parted ways with Apple in October 1989, Quantum changed the service's name to America Online. Case promoted and sold AOL as the online service for people unfamiliar with computers, in contrast to CompuServe, which was well established in the technical community.
From the beginning, AOL included online games in its mix of products; many classic and casual games were included in the original PlayNet software system. The company introduced many innovative online interactive titles and games, including:
1991–2006: Internet age, Time Warner merger.
In February 1991, AOL for DOS was launched using a GeoWorks interface; it was followed a year later by AOL for Windows. This coincided with growth in pay-based online services, like Prodigy, CompuServe, and GEnie.
During the early 1990s, the average subscription lasted for about 25 months and accounted for $350 in total revenue. Advertisements invited modem owners to "Try America Online FREE", promising free software and trial membership. AOL discontinued Q-Link and PC Link in late 1994. In September 1993, AOL added Usenet access to its features. This is commonly referred to as the "Eternal September", as Usenet's cycle of new users was previously dominated by smaller numbers of college and university freshmen gaining access in September and taking a few weeks to acclimate. This also coincided with a new "carpet bombing" marketing campaign by CMO Jan Brandt to distribute as many free trial AOL trial disks as possible through nonconventional distribution partners. At one point, 50% of the CDs produced worldwide had an AOL logo. AOL quickly surpassed GEnie, and by the mid-1990s, it passed Prodigy (which for several years allowed AOL advertising) and CompuServe. In November 1994, AOL purchased Booklink for its web browser, to give its users web access. In 1996, AOL replaced Booklink with a browser based on Internet Explorer, reportedly in exchange for inclusion of AOL in Windows.
AOL launched services with the National Education Association, the American Federation of Teachers, "National Geographic", the Smithsonian Institution, the Library of Congress, Pearson, Scholastic, ASCD, NSBA, NCTE, Discovery Networks, Turner Education Services (CNN Newsroom), NPR, The Princeton Review, Stanley Kaplan, Barron's, Highlights for Kids, the US Department of Education, and many other education providers. AOL offered the first real-time homework help service (the Teacher Pager—1990; prior to this, AOL provided homework help bulletin boards), the first service by children, for children (Kids Only Online, 1991), the first online service for parents (the Parents Information Network, 1991), the first online courses (1988), the first omnibus service for teachers (the Teachers' Information Network, 1990), the first online exhibit (Library of Congress, 1991), the first parental controls, and many other online education firsts.
AOL purchased search engine WebCrawler in 1995, but sold it to Excite the following year; the deal made Excite the sole search and directory service on AOL. After the deal closed in March 1997, AOL launched its own branded search engine, based on Excite, called NetFind. This was renamed to AOL Search in 1999.
AOL charged its users an hourly fee until December 1996, when the company changed to a flat monthly rate of $19.95. During this time, AOL connections were flooded with users trying to connect, and many canceled their accounts due to constant busy signals. A commercial was made featuring Steve Case telling people AOL was working day and night to fix the problem. Within three years, AOL's user base grew to 10 million people. In 1995, AOL was headquartered at 8619 Westwood Center Drive in the Tysons Corner CDP in unincorporated Fairfax County, Virginia in the Washington, D.C. metropolitan area. near the Town of Vienna.
AOL was quickly running out of room in October 1996 for its network at the Fairfax County campus. In mid-1996, AOL moved to 22000 AOL Way in Dulles, unincorporated Loudoun County, Virginia to provide room for future growth. In a five-year landmark agreement with the most popular operating system, AOL was bundled with Windows software.
On March 31, 1996, the short-lived eWorld was purchased by AOL. In 1997, about half of all US homes with Internet access had it through AOL. During this time, AOL's content channels, under Jason Seiken, including News, Sports, and Entertainment, experienced their greatest growth as AOL become the dominant online service internationally with more than 34 million subscribers.
In February 1998, AOL acquired CompuServe Interactive Services (CIS) via WorldCom (later Verizon), which kept Compuware's networking business.
In November 1998, AOL announced it would acquire Netscape, best known for their web browser, in a major $4.2 billion deal. The deal closed on March 17, 1999. Another large acquisition in December 1999 was that of MapQuest, for $1.1 billion.
In January 2000, as new broadband technologies were being rolled out around the New York City metropolitan area and elsewhere across the United States, AOL and Time Warner announced plans to merge, forming AOL Time Warner, Inc. The terms of the deal called for AOL shareholders to own 55% of the new, combined company. The deal closed on January 11, 2001. The new company was led by executives from AOL, SBI, and Time Warner. Gerald Levin, who had served as CEO of Time Warner, was CEO of the new company. Steve Case served as chairman, J. Michael Kelly (from AOL) was the chief financial officer, Robert W. Pittman (from AOL) and Dick Parsons (from Time Warner) served as co-chief operating officers. In 2002, Jonathan Miller became CEO of AOL. The following year, AOL Time Warner dropped the "AOL" from its name. It was the largest merger in history when completed with the combined value of the companies at $360 billion. This value fell sharply, to as low as $120 billion, as markets repriced AOL's valuation as a pure internet firm more modestly when combined with the traditional media and cable business. This status did not last long, and the company's value rose again within three months. By the end of that year, the tide had turned against "pure" internet companies, with many collapsing under falling stock prices, and even the strongest companies in the field losing up to 75% of their market value. The decline continued though 2001, but even with the losses, AOL was among the internet giants that continued to outperform brick and mortar companies.
In 2004, along with the launch of AOL 9.0 Optimized, AOL also made available the option of personalized greetings which would enable the user to hear his or her name while accessing basic functions and mail alerts, or while logging in or out. In 2005, AOL broadcast the Live 8 concert live over the Internet, and thousands of users downloaded clips of the concert over the following months. In late 2005, AOL released AOL Safety & Security Center, a bundle of McAfee Antivirus, CA anti-spyware, and proprietary firewall and phishing protection software. News reports in late 2005 identified companies such as Yahoo!, Microsoft, and Google as candidates for turning AOL into a joint venture. Those plans were abandoned when it was revealed on December 20, 2005, that Google would purchase a 5% share of AOL for $1 billion.
2006–2009: rebranding and decline.
On April 3, 2006, AOL announced that it would retire the full name America Online. The official name of the service became AOL, and the full name of the Time Warner subdivision became AOL LLC. On June 8, 2006, AOL offered a new program called AOL Active Security Monitor, a diagnostic tool to monitor and rate PC security status, and recommended additional security software from AOL or Download.com. Two months later, AOL released AOL Active Virus Shield, a free product developed by Kaspersky Lab, that did not require an AOL account, only an internet email address. The ISP side of AOL UK was bought by Carphone Warehouse in October 2006 to take advantage of its 100,000 LLU customers, making Carphone Warehouse the largest LLU provider in the UK.
In August 2006, AOL announced that it would offer email accounts and software previously available only to its paying customers, provided that users accessed AOL or AOL.com through an access method not owned by AOL (otherwise known as "third party transit", "bring your own access" or "BYOA"). The move was designed to reduce costs associated with the "walled garden" business model by reducing usage of AOL-owned access points and shifting members with high-speed internet access from client-based usage to the more lucrative advertising provider AOL.com. The change from paid to free access was also designed to slow the rate at which members canceled their accounts and defected to Microsoft Hotmail, Yahoo! or other free email providers. The other free services included:
Also in August, AOL informed its US customers of an increase in the price of its dial-up access to $25.90. The increase was part of an effort to migrate the service's remaining dial-up users to broadband, as the increased price was the same as that of its monthly DSL access. However, AOL subsequently began offering unlimited dial-up access for $9.95 a month.
On November 16, 2006, Randy Falco succeeded Jonathan Miller as CEO. In December 2006, AOL closed its last remaining call center in the United States, "taking the America out of America Online," according to industry pundits. Service centers based in India and the Philippines continue to provide customer support and technical assistance to subscribers.
On September 17, 2007, AOL announced the relocation of one of its corporate headquarters from Dulles, Virginia to New York City and the combination of its advertising units into a new subsidiary called Platform A. This action followed several advertising acquisitions, most notably Advertising.com, and highlighted the company's new focus on advertising-driven business models. AOL management stressed that "significant operations" would remain in Dulles, which included the company's access services and modem banks.
In October 2007, AOL announced the relocation of its other headquarters from Loudoun County, Virginia to New York City, while continuing to operate its Virginia offices. As part of the move to New York and the restructuring of responsibilities at the Dulles headquarters complex after the Reston move, Falco announced on October 15, 2007, plans to lay off 2,000 employees worldwide by the end of 2007, beginning "immediately". The result was a layoff of approximately 40% of AOL's employees. Most compensation packages associated with the October 2007 layoffs included a minimum of 120 days of severance pay, 60 of which were offered in lieu of the 60-day advance notice requirement by provisions of the 1988 federal WARN Act.
By November 2007, AOL's customer base had been reduced to 10.1 million subscribers, slightly more than the number of subscribers of Comcast and AT&T Yahoo!. According to Falco, as of December 2007, the conversion rate of accounts from paid access to free access was more than 80%.
On January 3, 2008, AOL announced the closing of its Reston, Virginia, data center, which was sold to CRG West. On February 6, Time Warner CEO Jeff Bewkes announced that Time Warner would divide AOL's internet-access and advertising businesses, with the possibility of later selling the internet-access division.
On March 13, 2008, AOL purchased the social networking site Bebo for $850 million (£417 million). On July 25, AOL announced that it was shuttering Xdrive, AOL Pictures and BlueString to save on costs and focus on its core advertising business. AOL Pictures was closed on December 31. On October 31, AOL Hometown (a web-hosting service for the websites of AOL customers) and the AOL Journal blog hosting service were eliminated.
2009–2015: As a digital media company.
On March 12, 2009, Tim Armstrong, formerly with Google, was named chairman and CEO of AOL. On May 28, Time Warner announced that it would position AOL as an independent company after Google's shares ceased at the end of the fiscal year. On November 23, AOL unveiled a new brand identity with the wordmark "Aol." superimposed onto canvases created by commissioned artists. The new identity, designed by Wolff Olins, was integrated with all of AOL's services on December 10, the date upon which AOL traded independently for the first time since the Time Warner merger on the New York Stock Exchange under the symbol AOL.
On April 6, 2010, AOL announced plans to shutter or sell Bebo. On June 16, the property was sold to Criterion Capital Partners for an undisclosed amount, believed to be approximately $10 million. In December, AIM eliminated access to AOL chat rooms, noting a marked decline in usage in recent months.
Under Armstrong's leadership, AOL followed a new business direction marked by a series of acquisitions. It announced the acquisition of Patch Media, a network of community-specific news and information sites focused on towns and communities. On September 28, 2010, at the San Francisco TechCrunch Disrupt Conference, AOL signed an agreement to acquire TechCrunch. On December 12, 2010, AOL acquired about.me, a personal profile and identity platform, four days after the platform's public launch.
On January 31, 2011, AOL announced the acquisition of European video distribution network goviral. In March 2011, AOL acquired "HuffPost" for $315 million. Shortly after the acquisition was announced, "Huffington Post" co-founder Arianna Huffington replaced AOL content chief David Eun, assuming the role of president and editor-in-chief of the AOL Huffington Post Media Group. On March 10, AOL announced that it would cut approximately 900 workers following the "HuffPost" acquisition.
On September 14, 2011, AOL formed a strategic ad-selling partnership with two of its largest competitors, Yahoo and Microsoft. The three companies would begin selling inventory on each other's sites. The strategy was designed to help the companies compete with Google and advertising networks.
On February 28, 2012, AOL partnered with PBS to launch MAKERS, a digital documentary series focusing on high-achieving women in industries perceived as male-dominated such as war, comedy, space, business, Hollywood and politics. Subjects for MAKERS episodes have included Oprah Winfrey, Hillary Clinton, Sheryl Sandberg, Martha Stewart, Indra Nooyi, Lena Dunham and Ellen DeGeneres.
On March 15, 2012, AOL announced the acquisition of Hipster, a mobile photo-sharing app, for an undisclosed amount. On April 9, 2012, AOL announced a deal to sell 800 patents to Microsoft for $1.056 billion. The deal included a perpetual license for AOL to use the patents.
In April, AOL took several steps to expand its ability to generate revenue through online video advertising. The company announced that it would offer gross rating point (GRP) guarantee for online video, mirroring the television-ratings system and guaranteeing audience delivery for online-video advertising campaigns bought across its properties. This announcement came just days before the Digital Content NewFront (DCNF) a two-week event held by AOL, Google, Hulu, Microsoft, Vevo and Yahoo to showcase the participating sites' digital video offerings. The DCNF was conducted in advance of the traditional television upfronts in the hope of diverting more advertising money into the digital space. On April 24, the company launched the AOL On network, a single website for its video output.
In February 2013, AOL reported its fourth quarter revenue of $599.5 million, its first growth in quarterly revenue in eight years.
In August 2013, Armstrong announced that Patch Media would scale back or sell hundreds of its local news sites. Not long afterward, layoffs began, with up to 500 out of 1,100 positions initially impacted. On January 15, 2014, Patch Media was spun off, and majority ownership was held by Hale Global. By the end of 2014, AOL controlled 0.74% of the global advertising market, well behind industry leader Google's 31.4%.
On January 23, 2014, AOL acquired Gravity, a software startup that tracked users' online behavior and tailored ads and content based on their interests, for $83 million. The deal, which included approximately 40 Gravity employees and the company's personalization technology, was Armstrong's fourth-largest deal since taking command in 2009. Later that year, AOL acquired Vidible, a company that developed technology to help websites run video content from other publishers, and help video publishers sell their content to these websites. The deal, which was announced December 1, 2014, was reportedly worth roughly $50 million.
On July 16, 2014, AOL earned an Emmy nomination for the AOL original series "The Future Starts Here" in the News and Documentary category. This came days after AOL earned its first Primetime Emmy Award nomination and win for "Park Bench with Steve Buscemi" in the Outstanding Short Form Variety Series. Created and hosted by Tiffany Shlain, the series focused on humans' relationship with technology and featured episodes such as "The Future of Our Species", "Why We Love Robots" and "A Case for Optimism".
2015–2021: division of Verizon.
On May 12, 2015, Verizon announced plans to buy AOL for $50 per share in a deal valued at $4.4 billion. The transaction was completed on June 23. Armstrong, who continued to lead the firm following regulatory approval, called the deal the logical next step for AOL. "If you look forward five years, you're going to be in a space where there are going to be massive, global-scale networks, and there's no better partner for us to go forward with than Verizon." he said. "It's really not about selling the company today. It's about setting up for the next five to 10 years."
Analyst David Bank said he thought the deal made sense for Verizon. The deal will broaden Verizon's advertising sales platforms and increase its video production ability through websites such as "HuffPost", TechCrunch, and Engadget. However, Craig Moffett said it was unlikely the deal would make a big difference to Verizon's bottom line. AOL had about two million dial-up subscribers at the time of the buyout. The announcement caused AOL's stock price to rise 17%, while Verizon's stock price dropped slightly.
Shortly before the Verizon purchase, on April 14, 2015, AOL launched ONE by AOL, a digital marketing programmatic platform that unifies buying channels and audience management platforms to track and optimize campaigns over multiple screens. Later that year, on September 15, AOL expanded the product with ONE by AOL: Creative, which is geared towards creative and media agencies to similarly connect marketing and ad distribution efforts.
On May 8, 2015, AOL reported its first-quarter revenue of $625.1 million, $483.5 million of which came from advertising and related operations, marking a 7% increase from Q1 2014. Over that year, the AOL Platforms division saw a 21% increase in revenue, but a drop in adjusted OIBDA due to increased investments in the company's video and programmatic platforms.
On June 29, 2015, AOL announced a deal with Microsoft to take over the majority of its digital advertising business. Under the pact, as many as 1,200 Microsoft employees involved with the business will be transferred to AOL, and the company will take over the sale of display, video, and mobile ads on various Microsoft platforms in nine countries, including Brazil, Canada, the United States, and the United Kingdom. Additionally, Google Search will be replaced on AOL properties with Bing—which will display advertising sold by Microsoft. Both advertising deals are subject to affiliate marketing revenue sharing.
On July 22, 2015, AOL received two News and Documentary Emmy nominations, one for MAKERS in the Outstanding Historical Programming category, and the other for "True Trans With Laura Jane Grace", which documented the story of Laura Jane Grace, a transgender musician best known as the founder, lead singer, songwriter and guitarist of the punk rock band Against Me!, and her decision to come out publicly and overall transition experience.
On September 3, 2015, AOL agreed to buy Millennial Media for $238 million. On October 23, 2015, AOL completed the acquisition.
On October 1, 2015, Go90, a free ad-supported mobile video service aimed at young adult and teen viewers that Verizon owns and AOL oversees and operates, launched its content publicly after months of beta testing. The initial launch line-up included content from Comedy Central, HuffPost, Nerdist News, Univision News, Vice, ESPN and MTV.
On April 20, 2016, AOL acquired virtual reality studio RYOT to bring immersive 360 degree video and VR content to HuffPost's global audience across desktop, mobile, and apps.
In July 2016, Verizon Communications announced its intent to purchase the core internet business of Yahoo!. Verizon merged AOL with Yahoo into a new company called "Oath Inc.", which in January 2019 rebranded itself as Verizon Media.
In April 2018, Oath Inc. sold Moviefone to MoviePass Parent Helios and Matheson Analytics.
In November 2020 the "Huffington Post" was sold to BuzzFeed in a stock deal.
2021–present: Apollo Global Management.
On May 3, 2021, Verizon announced it would sell 90 percent of its Verizon Media division to Apollo Global Management for $5 billion. The division became the second incarnation of Yahoo! Inc.
Products and services.
Content.
As of September 1, 2021, the following media brands became subsidiary of AOL's parent Yahoo Inc.
AOL's content contributors consists of over 20,000 bloggers, including politicians, celebrities, academics, and policy experts, who contribute on a wide range of topics making news.
In addition to mobile-optimized web experiences, AOL produces mobile applications for existing AOL properties like Autoblog, Engadget, The Huffington Post, TechCrunch, and products such as Alto, Pip, and Vivv.
Advertising.
AOL has a global portfolio of media brands and advertising services across mobile, desktop, and TV. Services include brand integration and sponsorships through its in-house branded content arm, Partner Studio by AOL, as well as data and programmatic offerings through ad technology stack, ONE by AOL.
AOL acquired a number of businesses and technologies help to form ONE by AOL. These acquisitions included AdapTV in 2013 and Convertro, Precision Demand, and Vidible in 2014. ONE by AOL is further broken down into ONE by AOL for Publishers (formerly Vidible, AOL On Network and Be On for Publishers) and ONE by AOL for Advertisers, each of which have several sub-platforms.
On September 10, 2018, AOL's parent company Oath consolidated BrightRoll, One by AOL and Yahoo Gemini to 'simplify' adtech service by launching a single advertising proposition dubbed Oath Ad Platforms, now Yahoo! Ad Tech.
Membership.
AOL offers a range of integrated products and properties including communication tools, mobile apps and services and subscription packages.
In 2017, before the discontinuation of AIM, "billions of messages" were sent "daily" on it and AOL's other chat services.
AOL Desktop.
AOL Desktop is an internet suite produced by AOL from 2007 that integrates a web browser, a media player and an instant messenger client. Version 10.X was based on AOL OpenRide, it is an upgrade from such. The macOS version is based on WebKit.
AOL Desktop version 10.X was different from previous AOL browsers and AOL Desktop versions. Its features are focused on web browsing as well as email. For instance, one does not have to sign into AOL in order to use it as a regular browser. In addition, non-AOL email accounts can be accessed through it. Primary buttons include "MAIL", "IM", and several shortcuts to various web pages. The first two require users to sign in, but the shortcuts to web pages can be used without authentication. AOL Desktop version 10.X was later marked as unsupported in favor of supporting the AOL Desktop 9.X versions.
Version 9.8 was released, replacing the Internet Explorer components of the web browser with CEF (Chromium Embedded Framework) to give users an improved web browsing experience closer to that of Chrome.
Version 11 of AOL Desktop was a total rewrite but maintained a similar user interface to the previous 9.8.X series of releases.
In 2017, a new paid version called AOL Desktop Gold was released, available for $4.99 per month after trial. It replaced the previous free version. After the shutdown of AIM in 2017, AOL's original chat rooms continued to be accessible through AOL Desktop Gold, and some rooms remained active during peak hours. That chat system was shut down on December 15, 2020.
In addition to AOL Desktop, the company also offered a browser toolbar Mozilla plug-in, AOL Toolbar, for several web browsers that provided quick access to AOL services. The toolbar was available from 2007 until 2018.
Criticism.
In its earlier incarnation as a "walled garden" community and service provider, AOL received criticism for its community policies, terms of service, and customer service. Prior to 2006, AOL was known for its direct mailing of CD-ROMs and 3.5-inch floppy disks containing its software. The disks were distributed in large numbers; at one point, half of the CDs manufactured worldwide had AOL logos on them. The marketing tactic was criticized for its environmental cost, and AOL CDs were recognized as "PC World"s most annoying tech product.
Community leaders.
AOL used a system of volunteers to moderate its chat rooms, forums and user communities. The program dated back to AOL's early days, when it charged by the hour for access and one of its highest billing services was chat. AOL provided free access to community leaders in exchange for moderating the chat rooms, and this effectively made chat very cheap to operate, and more lucrative than AOL's other services of the era. There were 33,000 community leaders in 1996. All community leaders received hours of training and underwent a probationary period. While most community leaders moderated chat rooms, some ran AOL communities and controlled their layout and design, with as much as 90% of AOL's content being created or overseen by community managers until 1996.
By 1996, ISPs were beginning to charge flat rates for unlimited access, which they could do at a profit because they only provided internet access. Even though AOL would lose money with such a pricing scheme, it was forced by market conditions to offer unlimited access in October 1996. In order to return to profitability, AOL rapidly shifted its focus from content creation to advertising, resulting in less of a need to carefully moderate every forum and chat room to keep users willing to pay by the minute to remain connected.
After unlimited access, AOL considered scrapping the program entirely, but continued it with a reduced number of community leaders, with scaled-back roles in creating content. Although community leaders continued to receive free access, after 1996 they were motivated more by the prestige of the position and the access to moderator tools and restricted areas within AOL. By 1999, there were over 15,000 volunteers in the program.
In May 1999, two former volunteers filed a class-action lawsuit alleging AOL violated the Fair Labor Standards Act by treating volunteers like employees. Volunteers had to apply for the position, commit to working for at least three to four hours a week, fill out timecards and sign a non-disclosure agreement. On July 22, AOL ended its youth corps, which consisted of 350 underage community leaders. At this time, the United States Department of Labor began an investigation into the program, but it came to no conclusions about AOL's practices.
AOL ended its community leader program on June 8, 2005. The class action lawsuit dragged on for years, even after AOL ended the program and AOL declined as a major internet company. In 2010, AOL finally agreed to settle the lawsuit for $15 million. The community leader program was described as an example of co-production in a 2009 article in "International Journal of Cultural Studies".
Billing disputes.
AOL has faced a number of lawsuits over claims that it has been slow to stop billing customers after their accounts have been canceled, either by the company or the user. In addition, AOL changed its method of calculating used minutes in response to a class action lawsuit. Previously, AOL would add 15 seconds to the time a user was connected to the service and round up to the next whole minute (thus, a person who used the service for 12 minutes and 46 seconds would be charged for 14 minutes). AOL claimed this was to account for sign on/sign off time, but because this practice was not made known to its customers, the plaintiffs won (some also pointed out that signing on and off did not always take 15 seconds, especially when connecting via another ISP). AOL disclosed its connection-time calculation methods to all of its customers and credited them with extra free hours. In addition, the AOL software would notify the user of exactly how long they were connected and how many minutes they were being charged.
AOL was sued by the Ohio Attorney General in October 2003 for improper billing practices. The case was settled on June 8, 2005. AOL agreed to resolve any consumer complaints filed with the Ohio AG's office. In December 2006, AOL agreed to provide restitution to Florida consumers to settle the case filed against them by the Florida Attorney General.
Account cancellation.
Many customers complained that AOL personnel ignored their demands to cancel service and stop billing. In response to approximately 300 consumer complaints, the New York Attorney General's office began an inquiry of AOL's customer service policies. The investigation revealed that the company had an elaborate scheme for rewarding employees who purported to retain or "save" subscribers who had called to cancel their Internet service. In many instances, such retention was done against subscribers' wishes, or without their consent. Under the scheme, customer service personnel received bonuses worth tens of thousands of dollars if they could successfully dissuade or "save" half of the people who called to cancel service. For several years, AOL had instituted minimum retention or "save" percentages, which consumer representatives were expected to meet. These bonuses, and the minimum "save" rates accompanying them, had the effect of employees not honoring cancellations, or otherwise making cancellation unduly difficult for consumers.
On August 24, 2005, America Online agreed to pay $1.25 million to the state of New York and reformed its customer service procedures. Under the agreement, AOL would no longer require its customer service representatives to meet a minimum quota for customer retention in order to receive a bonus. However the agreement only covered people in the state of New York.
On June 13, 2006, Vincent Ferrari documented his account cancellation phone call in a blog post, stating he had switched to broadband years earlier. In the recorded phone call, the AOL representative refused to cancel the account unless the 30-year-old Ferrari explained why AOL hours were still being recorded on it. Ferrari insisted that AOL software was not even installed on the computer. When Ferrari demanded that the account be canceled regardless, the AOL representative asked to speak with Ferrari's father, for whom the account had been set up. The conversation was aired on CNBC. When CNBC reporters tried to have an account on AOL cancelled, they were hung up on immediately and it ultimately took more than 45 minutes to cancel the account.
On July 19, 2006, AOL's entire retention manual was released on the Internet. On August 3, 2006, Time Warner announced that the company would be dissolving AOL's retention centers due to its profits hinging on $1 billion in cost cuts. The company estimated that it would lose more than six million subscribers over the following year.
Direct marketing of disks.
Prior to 2006, AOL often sent unsolicited mass direct mail of 3" floppy disks and CD-ROMs containing their software. They were the most frequent user of this marketing tactic, and received criticism for the environmental cost of the campaign. According to "PC World", in the 1990s "you couldn't open a magazine ("PC World" included) or your mailbox without an AOL disk falling out of it".
The mass distribution of these disks was seen as wasteful by the public and led to protest groups. One such was No More AOL CDs, a web-based effort by two IT workers to collect one million disks with the intent to return the disks to AOL. The website was started in August 2001, and an estimated 410,176 CDs were collected by August 2007 when the project was shut down.
Software.
In 2000, AOL was served with an $8 billion lawsuit alleging that its AOL 5.0 software caused significant difficulties for users attempting to use third-party Internet service providers. The lawsuit sought damages of up to $1000 for each user that had downloaded the software cited at the time of the lawsuit. AOL later agreed to a settlement of $15 million, without admission of wrongdoing. The AOL software then was given a feature called AOL Dialer, or AOL Connect on . This feature allowed users to connect to the ISP without running the full interface. This allowed users to use only the applications they wish to use, especially if they do not favor the AOL Browser.
AOL 9.0 was once identified by Stopbadware as being "under investigation" for installing additional software without disclosure, and modifying browser preferences, toolbars, and icons. However, as of the release of AOL 9.0 VR (Vista Ready) on January 26, 2007, it was no longer considered badware due to changes AOL made in the software.
Usenet newsgroups.
When AOL gave clients access to Usenet in 1993, they hid at least one newsgroup in standard list view: "alt.aol-sucks". AOL did list the newsgroup in the alternative description view, but changed the description to "Flames and complaints about America Online". With AOL clients swarming Usenet newsgroups, the old, existing user base started to develop a strong distaste for both AOL and its clients, referring to the new state of affairs as Eternal September.
AOL discontinued access to Usenet on June 25, 2005. No official details were provided as to the cause of decommissioning Usenet access, except providing users the suggestion to access Usenet services from a third-party, Google Groups. AOL then provided community-based message boards in lieu of Usenet.
Terms of Service (TOS).
AOL has a detailed set of guidelines and expectations for users on their service, known as the Terms of Service (TOS, also known as Conditions of Service (COS) in the UK). It is separated into three different sections: "Member Agreement", "Community Guidelines" and "Privacy Policy". All three agreements are presented to users at time of registration and digital acceptance is achieved when they access the AOL service. During the period when volunteer chat room hosts and board monitors were used, chat room hosts were given a brief online training session and test on Terms of Service violations.
There have been many complaints over rules that govern an AOL user's conduct. Some users disagree with the TOS, citing the guidelines are too strict to follow coupled with the fact the TOS may change without users being made aware. A considerable cause for this was likely due to alleged censorship of user-generated content during the earlier years of growth for AOL.
Certified email.
In early 2005, AOL stated its intention to implement a certified email system called Goodmail, which will allow companies to send email to users with whom they have pre-existing business relationships, with a visual indication that the email is from a trusted source and without the risk that the email messages might be blocked or stripped by spam filters.
This decision drew fire from MoveOn, which characterized the program as an "email tax", and the Electronic Frontier Foundation (EFF), which characterized it as a shakedown of non-profits. A website called Dearaol.com was launched, with an online petition and a blog that garnered hundreds of signatures from people and organizations expressing their opposition to AOL's use of Goodmail.
Esther Dyson defended the move in an editorial in "The New York Times", saying "I hope Goodmail succeeds, and that it has lots of competition. I also think it and its competitors will eventually transform into services that more directly serve the interests of mail recipients. Instead of the fees going to Goodmail and AOL, they will also be shared with the individual recipients."
Tim Lee of the Technology Liberation Front posted an article that questioned the Electronic Frontier Foundation's adopting a confrontational posture when dealing with private companies. Lee's article cited a series of discussions on Declan McCullagh's Politechbot mailing list on this subject between the EFF's Danny O'Brien and antispammer Suresh Ramasubramanian, who has also compared the EFF's tactics in opposing Goodmail to tactics used by Republican political strategist Karl Rove. SpamAssassin developer Justin Mason posted some criticism of the EFF's and Moveon's "going overboard" in their opposition to the scheme.
The dearaol.com campaign lost momentum and disappeared, with the last post to the now defunct dearaol.com blog—"AOL starts the shakedown" being made on May 9, 2006.
Comcast, who also used the service, announced on its website that Goodmail had ceased operations and as of February 4, 2011, they no longer used the service.
Search data.
On August 4, 2006, AOL released a compressed text file on one of its websites containing 20 million search keywords for over 650,000 users over a three-month period between March 1 and May 31, 2006, intended for research purposes. AOL pulled the file from public access by August 7, but not before its wide distribution on the Internet by others. Derivative research, titled "A Picture of Search" was published by authors Pass, Chowdhury and Torgeson for The First International Conference on Scalable Information Systems.
The data were used by websites such as AOLstalker for entertainment purposes, where users of AOLstalker are encouraged to judge AOL clients based on the humorousness of personal details revealed by search behavior.
User list exposure.
In 2003, Jason Smathers, an AOL employee, was convicted of stealing America Online's 92 million screen names and selling them to a known spammer. Smathers pled guilty to conspiracy charges in 2005. Smathers pled guilty to violations of the US CAN-SPAM Act of 2003. He was sentenced in August 2005 to 15 months in prison; the sentencing judge also recommended Smathers be forced to pay $84,000 in restitution, triple the $28,000 that he sold the addresses for.
AOL's Computer Checkup "scareware".
On February 27, 2012, a class action lawsuit was filed against Support.com, Inc. and partner AOL, Inc. The lawsuit alleged Support.com and AOL's Computer Checkup "scareware" (which uses software developed by Support.com) misrepresented that their software programs would identify and resolve a host of technical problems with computers, offered to perform a free "scan", which often found problems with users' computers. The companies then offered to sell software—for which AOL allegedly charged $4.99 a month and Support.com $29—to remedy those problems. Both AOL, Inc. and Support.com, Inc. settled on May 30, 2013, for $8.5 million. This included $25.00 to each valid class member and $100,000 each to Consumer Watchdog and the Electronic Frontier Foundation. Judge Jacqueline Scott Corley wrote: "Distributing a portion of the [funds] to Consumer Watchdog will meet the interests of the silent class members because the organization will use the funds to help protect consumers across the nation from being subject to the types of fraudulent and misleading conduct that is alleged here," and "EFF's mission includes a strong consumer protection component, especially in regards to online protection."
AOL continues to market Computer Checkup.
NSA PRISM program.
Following media reports about PRISM, NSA's massive electronic surveillance program, in June 2013, several technology companies were identified as participants, including AOL. According to leaks of said program, AOL joined the PRISM program in 2011.
Hosting of user profiles changed, then discontinued.
At one time, most AOL users had an online "profile" hosted by the AOL Hometown service. When AOL Hometown was discontinued, users had to create a new profile on Bebo. This was an unsuccessful attempt to create a social network that would compete with Facebook. When the value of Bebo decreased to a tiny fraction of the $850 million AOL paid for it, users were forced to recreate their profiles yet again, on a new service called AOL Lifestream.
AOL decided to shut down Lifestream on February 24, 2017, and gave users one month's notice to save photos and videos that had been uploaded to Lifestream. Following the shutdown, AOL no longer provides any option for hosting user profiles.
During the Hometown/Bebo/Lifestream era, another user's profile could be displayed by clicking the "Buddy Info" button in the AOL Desktop software. After the shutdown of Lifestream, this was no longer supported, but opened to the AIM home page (www.aim.com), which also became defunct, redirecting to AOL's home page.
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The terms (AD) and before Christ (BC) are used when designating years in the Gregorian and Julian calendars. The term is Medieval Latin and means "in the year of the Lord" but is often presented using "our Lord" instead of "the Lord", taken from the full original phrase "", which translates to "in the year of our Lord Jesus Christ". The form "BC" is specific to English, and equivalent abbreviations are used in other languages: the Latin form, rarely used in English, is (ACN) or (AC).
This calendar era takes as its epoch the traditionally reckoned year of the conception or birth of Jesus. Years "AD" are counted forward since that epoch and years "BC" are counted backward from the epoch. There is no year zero in this scheme; thus the year AD 1 immediately follows the year 1 BC. This dating system was devised in 525 by Dionysius Exiguus but was not widely used until the 9th century. Modern scholars believe that the actual date of birth of Jesus was about 5 BC.
Terminology that is viewed by some as being more neutral and inclusive of non-Christian people is to call this the Common Era (abbreviated as CE), with the preceding years referred to as Before the Common Era (BCE). Astronomical year numbering and ISO 8601 do not use words or abbreviations related to Christianity, but use the same numbers for AD years (but not for BC years since the astronomical year 0 is 1 BC).
Usage.
Traditionally, English follows Latin usage by placing the "AD" abbreviation before the year number, though it is also found after the year. In contrast, "BC" is always placed after the year number (for example: 70 BC but AD 70), which preserves syntactic order. The abbreviation "AD" is also widely used after the number of a century or millennium, as in "fourth century AD" or "second millennium AD" (although conservative usage formerly rejected such expressions). Since "BC" is the English abbreviation for "Before Christ", it is sometimes incorrectly concluded that AD means "After Death" (i.e., after the death of Jesus), which would mean that the approximately 33 years commonly associated with the life of Jesus would be included in neither the BC nor the AD time scales.
History.
The "anno Domini" dating system was devised in 525 by Dionysius Exiguus to enumerate years in his Easter table. His system was to replace the Diocletian era that had been used in older Easter tables, as he did not wish to continue the memory of a tyrant who persecuted Christians. The last year of the old table, Diocletian Anno Martyrium 247, was immediately followed by the first year of his table, anno Domini 532. When Dionysius devised his table, Julian calendar years were identified by naming the consuls who held office that year—Dionysius stated that the "present year" was "the consulship of Probus Junior", which was 525 years "since the incarnation of our Lord Jesus Christ". Thus, Dionysius implied that Jesus' incarnation occurred 525 years earlier, without stating the specific year during which his birth or conception occurred. "However, nowhere in his exposition of his table does Dionysius relate his epoch to any other dating system, whether consulate, Olympiad, year of the world, or regnal year of Augustus; much less does he explain or justify the underlying date."
Bonnie J. Blackburn and Leofranc Holford-Strevens briefly present arguments for 2 BC, 1 BC, or AD 1 as the year Dionysius intended for the Nativity or incarnation. Among the sources of confusion are:
It is not known how Dionysius established the year of Jesus's birth. One theory is that Dionysius based his calculation on the Gospel of Luke, which states that Jesus was "about thirty years old" shortly after "the fifteenth year of the reign of Tiberius Caesar", and hence subtracted thirty years from that date. This method was probably the one used by ancient historians such as Tertullian, Eusebius or Epiphanius, all of whom agree that Jesus was born in 2 BC, probably following this statement of Jesus' age (i.e. subtracting thirty years from AD 29).
Another major theory asserts that Dionysius counted back 532 years from the first year of his new table, following an 532-year cycle established by the astronomical computations of Victorius of Aquitaine (the dates for Easter repeat every 532 years). Alternatively, Dionysius may have used an earlier unknown source, as the earlier Chronograph of 354 states that Jesus was born during the consulship of Caesar and Paullus (AD 1).
It has also been speculated by Georges Declercq that Dionysius' desire to replace Diocletian years with a calendar based on the incarnation of Christ was intended to prevent people from believing the imminent end of the world. At the time, it was believed by some that the resurrection of the dead and end of the world would occur 500 years after the birth of Jesus. The old "Anno Mundi" calendar theoretically commenced with the creation of the world based on information in the Old Testament. It was believed that, based on the "Anno Mundi" calendar, Jesus was born in the year 5500 (5500 years after the world was created) with the year 6000 of the "Anno Mundi" calendar marking the end of the world. "Anno Mundi" 6000 (approximately AD 500) was thus equated with the end of the world but this date had already passed in the time of Dionysius.
The "Historia Brittonum" attributed to Nennius written in the 9th century makes extensive use of the Anno Passionis (AP) dating system which was in common use as well as the newer AD dating system. The AP dating system took its start from 'The Year of The Passion'. It is generally accepted by experts there is a 27-year difference between AP and AD reference.
The date of birth of Jesus of Nazareth is not stated in the gospels or in any secular text, but most scholars assume a date of birth between 6 BC and 4 BC. The historical evidence is too fragmentary to allow a definitive dating, but the date is estimated through two different approaches—one by analyzing references to known historical events mentioned in the Nativity accounts in the Gospels of Luke and Matthew and the second by working backwards from the estimation of the start of the ministry of Jesus.
Popularization.
The Anglo-Saxon historian Bede, who was familiar with the work of Dionysius Exiguus, used "anno Domini" dating in his "Ecclesiastical History of the English People", which he completed in AD 731. In the "History" he also used the Latin phrase "ante [...] incarnationis dominicae tempus anno sexagesimo" ("in the sixtieth year before the time of the Lord's incarnation"), which is equivalent to the English "before Christ", to identify years before the first year of this era. Both Dionysius and Bede regarded "anno Domini" as beginning at the incarnation of Jesus Christ, but "the distinction between Incarnation and Nativity was not drawn until the late 9th century, when in some places the Incarnation epoch was identified with Christ's conception, i. e., the Annunciation on March 25" ("Annunciation style" dating).
On the continent of Europe, "anno Domini" was introduced as the era of choice of the Carolingian Renaissance by the English cleric and scholar Alcuin in the late eighth century. Its endorsement by Emperor Charlemagne and his successors popularizing the use of the epoch and spreading it throughout the Carolingian Empire ultimately lies at the core of the system's prevalence. According to the Catholic Encyclopedia, popes continued to date documents according to regnal years for some time, but usage of AD gradually became more common in Catholic countries from the 11th to the 14th centuries. In 1422, Portugal became the last Western European country to switch to the system begun by Dionysius. Eastern Orthodox countries only began to adopt AD instead of the Byzantine calendar in 1700 when Russia did so, with others adopting it in the 19th and 20th centuries.
Although "anno Domini" was in widespread use by the 9th century, the term "Before Christ" (or its equivalent) did not become common until much later. Bede used the expression "anno [...] ante incarnationem Dominicam" (in the year before the incarnation of the Lord) twice. "Anno ante Christi nativitatem" (in the year before the birth of Christ) is found in 1474 in a work by a German monk. In 1627, the French Jesuit theologian Denis Pétau (Dionysius Petavius in Latin), with his work "De doctrina temporum", popularized the usage "ante Christum" (Latin for "Before Christ") to mark years prior to AD.
New year.
When the reckoning from Jesus' incarnation began replacing the previous dating systems in western Europe, various people chose different Christian feast days to begin the year: Christmas, Annunciation, or Easter. Thus, depending on the time and place, the year number changed on different days in the year, which created slightly different styles in chronology:
With these various styles, the same day could, in some cases, be dated in 1099, 1100 or 1101.
Other Christian and European eras.
During the first six centuries of what would come to be known as the Christian era, European countries used various systems to count years. Systems in use included consular dating, imperial regnal year dating, and Creation dating.
Although the last non-imperial consul, Basilius, was appointed in 541 by Emperor Justinian I, later emperors through to Constans II (641–668) were appointed consuls on the first of January after their accession. All of these emperors, except Justinian, used imperial post-consular years for the years of their reign, along with their regnal years. Long unused, this practice was not formally abolished until Novell XCIV of the law code of Leo VI did so in 888.
Another calculation had been developed by the Alexandrian monk Annianus around the year AD 400, placing the Annunciation on 25 March AD 9 (Julian)—eight to ten years after the date that Dionysius was to imply. Although this incarnation was popular during the early centuries of the Byzantine Empire, years numbered from it, an "Era of Incarnation", were exclusively used and are still used in Ethiopia. This accounts for the seven- or eight-year discrepancy between the Gregorian and Ethiopian calendars.
Byzantine chroniclers like Maximus the Confessor, George Syncellus, and Theophanes dated their years from Annianus' creation of the world. This era, called "Anno Mundi", "year of the world" (abbreviated AM), by modern scholars, began its first year on 25 March 5492 BC. Later Byzantine chroniclers used "Anno Mundi" years from 1 September 5509 BC, the Byzantine Era. No single "Anno Mundi" epoch was dominant throughout the Christian world. Eusebius of Caesarea in his "Chronicle" used an era beginning with the birth of Abraham, dated in 2016 BC (AD 1 = 2017 Anno Abrahami).
Spain and Portugal continued to date by the Spanish Era (also called Era of the Caesars), which began counting from 38 BC, well into the Middle Ages. In 1422, Portugal became the last Catholic country to adopt the "anno Domini" system.
The Era of Martyrs, which numbered years from the accession of Diocletian in 284, who launched the most severe persecution of Christians, was used by the Church of Alexandria and is still officially used by the Coptic Orthodox and Coptic Catholic churches. It was also used by the Ethiopian and Eritrean churches. Another system was to date from the crucifixion of Jesus, which as early as Hippolytus and Tertullian was believed to have occurred in the consulate of the Gemini (AD 29), which appears in some medieval manuscripts.
CE and BCE.
Alternative names for the "anno Domini" era include "vulgaris aerae" (found 1615 in Latin),
"Vulgar Era" (in English, as early as 1635),
"Christian Era" (in English, in 1652),
"Common Era" (in English, 1708),
and "Current Era".
Since 1856, the alternative abbreviations CE and BCE (sometimes written C.E. and B.C.E.) are sometimes used in place of AD and BC.
The "Common/Current Era" ("CE") terminology is often preferred by those who desire a term that does not explicitly make religious references but still uses the same epoch as the "anno Domini" notation.
For example, Cunningham and Starr (1998) write that "B.C.E./C.E. […] do not presuppose faith in Christ and hence are more appropriate for interfaith dialog than the conventional B.C./A.D." Upon its foundation, the Republic of China adopted the Minguo Era but used the Western calendar for international purposes. The translated term was (). Later, in 1949, the People's Republic of China adopted () for all purposes domestic and foreign.
No year zero: start and end of a century.
In the AD year numbering system, whether applied to the Julian or Gregorian calendars, AD 1 is immediately preceded by 1 BC, with nothing in between them (there was no year zero). There are debates as to whether a new decade, century, or millennium begins on a year ending in zero or one.
For computational reasons, astronomical year numbering and the ISO 8601 standard designate years so that AD 1 = year 1, 1 BC = year 0, 2 BC = year −1, etc. In common usage, ancient dates are expressed in the Julian calendar, but ISO 8601 uses the Gregorian calendar and astronomers may use a variety of time scales depending on the application. Thus dates using the year 0 or negative years may require further investigation before being converted to BC or AD.
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Alcuin
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Alcuin of York (; ; 735 – 19 May 804), also called Ealhwine, Alhwin, or Alchoin, was a scholar, clergyman, poet, and teacher from York, Northumbria. He was born around 735 and became the student of Archbishop Ecgbert at York. At the invitation of Charlemagne, he became a leading scholar and teacher at the Carolingian court, where he remained a figure in the 780s and 790s. Before that, he was also a court chancellor in Aachen. "The most learned man anywhere to be found", according to Einhard's "Life of Charlemagne" (–833), he is considered among the most important intellectual architects of the Carolingian Renaissance. Among his pupils were many of the dominant intellectuals of the Carolingian era.
Alcuin wrote many theological and dogmatic treatises, as well as a few grammatical works and a number of poems. In 796, he was made abbot of Marmoutier Abbey, in Tours, where he worked on perfecting the Carolingian minuscule script. He remained there until his death.
Biography.
Background.
Alcuin was born in Northumbria, presumably sometime in the 730s. Virtually nothing is known of his parents, family background, or origin. In common hagiographical fashion, the "Vita Alcuini" asserts that Alcuin was of "noble English stock", and this statement has usually been accepted by scholars. Alcuin's own work only mentions such collateral kinsmen as Wilgils of Ripon, father of the missionary saint Willibrord; and Beornrad (also spelled Beornred), abbot of Echternach and bishop of Sens. Willibrord, Alcuin and Beornrad were all related by blood.
In his "Life" of St Willibrord, Alcuin writes that Wilgils called a "Pater familias", had founded an oratory and church at the mouth of the Humber, which had fallen into Alcuin's possession by inheritance. Because in early Anglo-Latin writing "paterfamilias" ("head of a family, householder") usually referred to a ("churl"), Donald A. Bullough suggests that Alcuin's family was of ("churlish") status: i.e., free but subordinate to a noble lord, and that Alcuin and other members of his family rose to prominence through beneficial connections with the aristocracy. If so, Alcuin's origins may lie in the southern part of what was formerly known as Deira.
York.
The young Alcuin came to the cathedral church of York during the golden age of Archbishop Ecgbert and his brother, the Northumbrian King Eadberht. Ecgbert had been a disciple of the Venerable Bede, who urged him to raise York to an archbishopric. King Eadberht and Archbishop Ecgbert oversaw the re-energising and reorganisation of the English church, with an emphasis on reforming the clergy and on the tradition of learning that Bede had begun. Ecgbert was devoted to Alcuin, who thrived under his tutelage.
The York school was renowned as a centre of learning in the liberal arts, literature, and science, as well as in religious matters. From here, Alcuin drew inspiration for the school he would lead at the Frankish court. He revived the school with the trivium and quadrivium disciplines, writing a codex on the trivium, while his student Hrabanus wrote one on the quadrivium.
Alcuin graduated to become a teacher during the 750s. His ascendancy to the headship of the York school, the ancestor of St Peter's School, began after Æthelbert of York became Archbishop of York in 767. Around the same time, Alcuin became a deacon in the church. He was never ordained a priest. Though no real evidence shows that he took monastic vows, he lived as if he had.
In 781, King Ælfwald I of Northumbria sent Alcuin to Rome to petition the Pope for official confirmation of York's status as an archbishopric and to confirm the election of the new archbishop, Eanbald I. On his way home, he met Charlemagne (whom he had met once before), this time in the Italian city of Parma.
Charlemagne.
Alcuin's intellectual curiosity allowed him to be reluctantly persuaded to join Charlemagne's court. He joined an illustrious group of scholars whom Charlemagne had gathered around him, the mainsprings of the Carolingian Renaissance: Peter of Pisa, Paulinus II of Aquileia, Rado, and Abbot Saint Fulrad. Alcuin would later write, "the Lord was calling me to the service of King Charles".
Alcuin became master of the Palace School of Charlemagne in Aachen () in 782. It had been founded by the king's ancestors as a place for the education of the royal children (mostly in manners and the ways of the court). However, Charlemagne wanted to include the liberal arts, and most importantly, the study of religion. From 782 to 790, Alcuin taught Charlemagne himself, his sons Pepin and Louis, as well as young men sent to be educated at court, and the young clerics attached to the palace chapel. Bringing with him from York his assistants Pyttel, Sigewulf, and Joseph, Alcuin revolutionised the educational standards of the Palace School, introducing Charlemagne to the liberal arts and creating a personalised atmosphere of scholarship and learning, to the extent that the institution came to be known as the "school of Master Albinus".
In this role as adviser, he took issue with the emperor's policy of forcing pagans to be baptised on pain of death, arguing, "Faith is a free act of the will, not a forced act. We must appeal to the conscience, not compel it by violence. You can force people to be baptised, but you cannot force them to believe". His arguments seem to have prevailed – Charlemagne abolished the death penalty for paganism in 797.
Charlemagne gathered the best men of every land in his court and became far more than just the king at the centre. It seems that he made many of these men his closest friends and counsellors. They referred to him as "David", a reference to the Biblical king David. Alcuin soon found himself on intimate terms with Charlemagne and the other men at court, where pupils and masters were known by affectionate and jesting nicknames. Alcuin himself was known as 'Albinus' or 'Flaccus'. While at Aachen, Alcuin bestowed pet names upon his pupils – derived mainly from Virgil's "Eclogues". According to the "Encyclopædia Britannica", "He loved Charlemagne and enjoyed the king's esteem, but his letters reveal that his fear of him was as great as his love."
After the death of Pope Adrian I, Alcuin was commissioned by Charlemagne to compose an epitaph for Adrian. The epitaph was inscribed on black stone quarried at Aachen and carried to Rome where it was set over Adrian's tomb in the south transept of St. Peter's Basilica just before Charlemagne's coronation in the basilica on Christmas Day 800.
Return to Northumbria and back to Francia.
In 790, Alcuin returned from the court of Charlemagne to England, to which he had remained attached. He dwelt there for some time, but Charlemagne then invited him back to help in the fight against the Adoptionist heresy, which was at that time making great progress in Toledo, the old capital of the Visigoths and still a major city for the Christians under Islamic rule in Spain. He is believed to have had contacts with Beatus of Liébana, from the Kingdom of Asturias, who fought against Adoptionism. At the Council of Frankfurt in 794, Alcuin upheld the orthodox doctrine against the views expressed by Felix of Urgel, an heresiarch according to the Catholic Encyclopedia. Having failed during his stay in Northumbria to influence King Æthelred I in the conduct of his reign, Alcuin never returned home.
He was back at Charlemagne's court by at least mid-792, writing a series of letters to Æthelred, to Hygbald, Bishop of Lindisfarne, and to Æthelhard, Archbishop of Canterbury in the succeeding months, dealing with the Viking attack on Lindisfarne in July 793. These letters and Alcuin's poem on the subject, , provide the only significant contemporary account of these events. In his description of the Viking attack, he wrote: "Never before has such terror appeared in Britain. Behold the church of St Cuthbert, splattered with the blood of God's priests, robbed of its ornaments."
Tours and death.
In 796, Alcuin was in his 60s. He hoped to be free from court duties and upon the death of Abbot Itherius of Saint Martin at Tours, Charlemagne put Marmoutier Abbey into Alcuin's care, with the understanding that he should be available if the king ever needed his counsel. There, he encouraged the work of the monks on the beautiful Carolingian minuscule script, ancestor of modern Roman typefaces using a mixture of upper- and lower-case letters. Latin paleography in the 8th century leaves little room for a single origin of the script, and sources contradict his importance as no proof has been found of his direct involvement in the creation of the script. Carolingian minuscule was already in use before Alcuin arrived in Francia. Most likely he was responsible for copying and preserving the script while at the same time restoring the purity of the form.
Alcuin died on 19 May 804, some 10 years before the emperor, and was buried at St. Martin's Church under an epitaph that partly read:
The majority of details on Alcuin's life come from his letters and poems. Also, autobiographical sections are in Alcuin's poem on York and in the "Vita Alcuini", a hagiography written for him at Ferrières in the 820s, possibly based in part on the memories of Sigwulf, one of Alcuin's pupils.
Scholarly and literary output.
Mathematician.
The collection of mathematical and logical word problems entitled "Propositiones ad acuendos juvenes" ("Problems to Sharpen Youths") is sometimes attributed to Alcuin. In a 799 letter to Charlemagne, the scholar claimed to have sent "certain figures of arithmetic for the joy of cleverness", which some scholars have identified with the "Propositiones".
The text contains about 53 mathematical word problems (with solutions), in no particular pedagogical order. Among the most famous of these problems are: four that involve river crossings, including the problem of three anxious brothers, each of whom has an unmarried sister whom he cannot leave alone with either of the other men lest she be defiled (Problem 17); the problem of the wolf, goat, and cabbage (Problem 18); and the problem of "the two adults and two children where the children weigh half as much as the adults" (Problem 19). Alcuin's sequence is the solution to one of the problems of that book.
Theologian.
Alcuin's work as a theologian was more concerned with conservation than originality. His nine scriptural commentaries—on Genesis, the Psalms, the Song of Solomon, Ecclesiastes, Hebrew Names, the Gospel of John, the Epistles to Titus, Philemon, and the Hebrews, The Sayings of St. Paul, and the Apocalypse—consist mostly of sentences taken from the Church Fathers, the apparent motive being to collect into convenient form the observations on the more important scriptural passages of the best commentators who had preceded him. Alcuin also engaged in textual criticism of the Vulgate, which had many variant readings in his time. Four Bibles are shown by the dedicatory poems affixed to them to have been prepared by him, or under his direction at Tours, probably during the years 799–801. Whatever the exact changes made by Alcuin in the Bible text may have been, the known disposition of the man—that he intended to recover Jerome's original text as much as possible—no less than the limits of the scholarship of his time, makes it certain that these changes were not of a far-reaching kind.
Of the three brief moral treatises Alcuin has left us, two, , and , are largely abridgments of the writing of Augustine on the same subjects, while the third, "On the Confession of Sins," is a concise exposition of the nature of confession, addressed to a congregation of monks. Closely allied to his moral writings in spirit and purpose are his sketches of the lives of saints Martin of Tours, Vedast, Richarius, and Willibrord, the last being a biography of considerable length.
Alcuin opposed Spanish Adoptionism, a Christological viewpoint advanced by bishops Felix of Urgell and Elipandus of Toledo.
Liturgist.
Besides his fame as an educator and a theologian, Alcuin was also the principal agent of the liturgical reform accomplished under the authority of Charlemagne. Upon Charlemagne's accession the Gallican Rite prevailed in France, but it was so modified by local customs and traditions as to constitute a serious obstacle to complete ecclesiastical unity. It was the purpose of the king to substitute the Roman Rite in place of the Gallican, or at least to bring about such a revision of the latter as to make it substantially one with the Roman. The strong leaning of Alcuin towards Roman traditions, combined with his conservative character and the universal authority of his name, qualified him for the accomplishment of a change which the royal authority in itself was powerless to effect.
The first of Alcuin's liturgical works appears to have been a homilary, or collection of sermons in Latin for use by priests. Another liturgical work of Alcuin consists of a collection of readings to be read on Sundays and holy days throughout the year, the . As, previous to his time, the portions of Scripture to be read at Mass were often merely indicated on the margins of the Bibles used, the commended itself by its convenience, and as he followed Roman usage here also, the result was another advance in the way of conformity to the Roman liturgy. The work of Alcuin which had the greatest and most lasting influence in this direction, however, was the missal which he compiled; prescribed as the official liturgical book of the Frankish church, Alcuin's missal soon came to be commonly used throughout Europe and was largely instrumental in bringing about uniformity in respect to the liturgy of the Mass in the whole Latin Church. Other liturgical productions of Alcuin were a collection of votive Masses drawn up for the monks of Fulda, a treatise called , a breviary for laymen, and a brief explanation of the ceremonies of baptism.
Literary influence.
Alcuin made the abbey school into a model of excellence and students flocked to it. He had many manuscripts copied using outstandingly beautiful calligraphy, the Carolingian minuscule based on round and legible uncial letters. He wrote many letters to his English friends, to Arno, bishop of Salzburg and above all to Charlemagne. These letters (of which 311 are extant) are filled mainly with pious meditations, but they form an important source of information as to the literary and social conditions of the time and are the most reliable authority for the history of humanism during the Carolingian age. Alcuin trained the numerous monks of the abbey in piety, and in the midst of these pursuits, he died.
Alcuin is the most prominent figure of the Carolingian Renaissance, in which three main periods have been distinguished: in the first of these, up to the arrival of Alcuin at the court, the Italians occupy a central place; in the second, Alcuin and the English are dominant; in the third (from 804), the influence of Theodulf of Orléans is preponderant.
Alcuin also developed manuals used in his educational work – a grammar and works on rhetoric and dialectics. These are written in the form of a dialogue, and in two of them the interlocutors are Charlemagne and Alcuin. He wrote several theological treatises: a "De fide Trinitatis", and commentaries on the Bible. Alcuin is credited with inventing the first known question mark, though it did not resemble the modern symbol.
Alcuin transmitted to the Franks the knowledge of Latin culture, which had existed in Anglo-Saxon England. A number of his works still exist. Besides some graceful epistles in the style of Venantius Fortunatus, he wrote some long poems, and notably he is the author of a history (in verse) of the church at York, "Versus de patribus, regibus et sanctis Eboracensis ecclesiae". At the same time, he is noted for making one of the only explicit comments on Old English poetry surviving from the early Middle Ages, in a letter to one Speratus, the bishop of an unnamed English see (possibly Unwona of Leicester): ("Let God's words be read at the episcopal dinner-table. It is right that a reader should be heard, not a harpist, patristic discourse, not pagan song. What has Ingeld to do with Christ?").
Perceived homoeroticism.
Some historians, including the queer historian John Boswell, have identified what they consider to be a homoerotic or homosexual subtext in Alcuin's writings. Others, like Allen Frantzen, have disputed this characterisation of his work; Frantzen identifies Alcuin's language with that of medieval Christian "amicitia" or friendship. Douglas Dales and Rowan Williams say "the use of language drawn [by Alcuin] from the "Song of Songs" transforms apparently erotic language into something within Christian friendship – 'an ordained affection. According to David Clark, passages in some of Alcuin's writings can be seen to display homosocial desire, even possibly homoerotic imagery, though he argues that it is not possible to necessarily determine whether they were the result of an outward expression of erotic feelings on the part of Alcuin.
Legacy.
Alcuin is honoured in the Church of England and in the Episcopal Church on 20 May the first available day after the day of his death (as Dunstan is celebrated on 19 May).
Alcuin is also venerated as a Saint by Eastern Orthodox Christians in the British Isles and Ireland. The Orthodox Fellowship of John the Baptist publishes a liturgical calendar that is widely used in that region, and this calendar includes a feast for St Alcuin.
Alcuin College, one of the colleges of the University of York, is named after him. In January 2020, Alcuin was the subject of the BBC Radio 4 programme "In Our Time". In December 2024, Alcuin was prominently featured in a Part 2 of a 3-part podcast series on Charlemagne in "The Rest Is History (podcast)".
Selected works.
For a complete census of Alcuin's works, see Marie-Hélène Jullien and Françoise Perelman, eds., "Clavis scriptorum latinorum medii aevi: Auctores Galliae 735–987, Tomus II – Alcuinus", Turnhout, Brepols, 1999.
Letters.
Of Alcuin's letters, over 310 have survived:
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Angilbert
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Angilbert, Count of Ponthieu ( – 18 February 814) was a noble Frankish poet who was educated under Alcuin and served Charlemagne as a secretary, diplomat, and son-in-law. He is venerated as a pre-Congregation saint and is still honored on the day of his death, 18 February.
Life.
Angilbert seems to have been brought up at the court of Charlemagne at the palace school in (Aachen). He was educated there as the pupil and then-friend of the great English scholar Alcuin. When Charlemagne sent his young son Pepin to Italy as King of the Lombards, Angilbert went along as "primicerius palatii", a high administrator of the satellite court. As the friend and adviser of Pepin, he assisted for a while in the government of Italy. Angilbert delivered the document on Iconoclasm from the Frankish Synod of Frankfurt to Pope Adrian I, and was later sent on three important embassies to the pope, in 792, 794, and 796. At one time, he served an officer of the maritime provinces. He accompanied Charlemagne to Rome in 800 and was one of the witnesses to his will in 811.
There are various traditions concerning Angilbert's relationship with Bertha, daughter of Charlemagne. One holds that they were married, another that they were not. They had, however, at least one daughter and two sons, one of whom, Nithard, became a notable figure in the mid-9th century, while their daughter Bertha went on to marry Helgaud II, Count of Ponthieu. Control of marriage and the meanings of legitimacy were hotly contested in the Middle Ages. Bertha and Angilbert are an example of how resistance to the idea of a sacramental marriage could coincide with holding church offices. On the other hand, some historians have speculated that Charlemagne opposed formal marriages for his daughters out of concern for political rivalries from their potential husbands; none of Charlemagne's daughters were married, despite political offers of arranged marriages.
In 790, Angilbert retired to the abbey of Centulum, the monastery of St Richarius () in Picardy. Elected abbot in 794, he rebuilt the monastery and endowed it with a library of 200 volumes. It was not uncommon for the Merovingian, Carolingian, or later kings to make laymen abbots of monasteries; the layman would often use the income of the monastery as his own and leave the monks a bare minimum for the necessary expenses of the foundation. Angilbert, in contrast, spent a great deal rebuilding Saint-Riquier; when he completed it, Charlemagne spent Easter of the year 800 there. In keeping with Carolingian policies, Angilbert established a school at Saint-Riquier to educate the local boys.
Poetry.
Angilbert's Latin poems reveal the culture and tastes of a man of the world, enjoying the closest intimacy with the imperial family. Charlemagne and the other men at court were known by affectionate and jesting nicknames. Charlemagne was referred to as "David", a reference to the Biblical king David. Angilbert was nicknamed "Homer" because he wrote poetry, and was the probable author of an epic, of which the fragment which has been preserved describes the life at the palace and the meeting between Charlemagne and Leo III. It is a mosaic from Virgil, Ovid, Lucan and Venantius Fortunatus, composed in the manner of Einhard's use of Suetonius. Of the shorter poems, besides the greeting to Pippin on his return from the campaign against the Avars (796), an epistle to David (i.e., Charlemagne) incidentally reveals a delightful picture of the poet living with his children in a house surrounded by pleasant gardens near the emperor's palace. The reference to Bertha, however, is distant and respectful, her name occurring merely on the list of princesses to whom he sends his salutation.
The poem "De conversione Saxonum" has been attributed to Angilbert.
Angilbert's poems were published by Ernst Dümmler in the "Monumenta Germaniae Historica". For criticisms of this edition, see Ludwig Traube in Max Roediger's "Schriften für germanische Philologie" (1888).
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Amine
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In chemistry, amines (, ) are organic compounds that contain carbon-nitrogen bonds. Amines are formed when one or more hydrogen atoms in ammonia are replaced by alkyl or aryl groups. The nitrogen atom in an amine possesses a lone pair of electrons. Amines can also exist as hetero cyclic compounds. Aniline is the simplest aromatic amine, consisting of a benzene ring bonded to an amino group.
Amines are classified into three types: primary (1°), secondary (2°), and tertiary (3°) amines. Primary amines (1°) contain one alkyl or aryl substituent and have the general formula <chem>RNH2</chem>. Secondary amines (2°) have two alkyl or aryl groups attached to the nitrogen atom, with the general formula <chem>R2NH</chem>. Tertiary amines (3°) contain three substituent groups bonded to the nitrogen atom, and are represented by the formula <chem>R3N</chem>.
The functional group present in primary amines is called the amino group.
Classification of amines.
Amines can be classified according to the nature and number of substituents on nitrogen. Aliphatic amines contain only H and alkyl substituents. Aromatic amines have the nitrogen atom connected to an aromatic ring.
Amines, alkyl and aryl alike, are organized into three subcategories based on the number of carbon atoms adjacent to the nitrogen (how many hydrogen atoms of the ammonia molecule are replaced by hydrocarbon groups):
A fourth subcategory is determined by the connectivity of the substituents attached to the nitrogen:
Related compounds.
Compounds where the nitrogen atom is attached to a carbonyl group, thus having the structure , are called amides.
Compounds containing four organic substituents on the nitrogen, thus having the structure , are quaternary ammonium salts. Many kinds of anions are found in such compounds.
Naming conventions.
Amines are named in several ways. Typically, the compound is given the prefix "amino-" or the suffix "-amine". The prefix ""N"-" shows substitution on the nitrogen atom. An organic compound with multiple amino groups is called a diamine, triamine, tetraamine and so forth.
Lower amines are named with the suffix "-amine".
Higher amines have the prefix "amino" as a functional group. IUPAC however does not recommend this convention, but prefers the alkanamine form, e.g. butan-2-amine.
Physical properties.
Hydrogen bonding significantly influences the properties of primary and secondary amines. For example, methyl and ethyl amines are gases under standard conditions, whereas the corresponding methyl and ethyl alcohols are liquids. Amines possess a characteristic ammonia smell, liquid amines have a distinctive "fishy" and foul smell.
The nitrogen atom features a lone electron pair that can bind H+ to form an ammonium ion R3NH+. The lone electron pair is represented in this article by two dots above or next to the N. The water solubility of simple amines is enhanced by hydrogen bonding involving these lone electron pairs. Typically salts of ammonium compounds exhibit the following order of solubility in water: primary ammonium () > secondary ammonium () > tertiary ammonium (R3NH+). Small aliphatic amines display significant solubility in many solvents, whereas those with large substituents are lipophilic. Aromatic amines, such as aniline, have their lone pair electrons conjugated into the benzene ring, thus their tendency to engage in hydrogen bonding is diminished. Their boiling points are high and their solubility in water is low.
Spectroscopic identification.
Typically the presence of an amine functional group is deduced by a combination of techniques, including mass spectrometry as well as NMR and IR spectroscopies. 1H NMR signals for amines disappear upon treatment of the sample with D2O. In their infrared spectrum primary amines exhibit two N-H bands, whereas secondary amines exhibit only one. In their IR spectra, primary and secondary amines exhibit distinctive N-H stretching bands near 3300 cm−1. Somewhat less distinctive are the bands appearing below 1600 cm−1, which are weaker and overlap with C-C and C-H modes. For the case of propyl amine, the H-N-H scissor mode appears near 1600 cm−1, the C-N stretch near 1000 cm−1, and the R2N-H bend near 810 cm−1.
Structure.
Alkyl amines.
Alkyl amines characteristically feature tetrahedral nitrogen centers. C-N-C and C-N-H angles are near 109°. C-N distances are slightly shorter than C-C distances. The energy barrier for the nitrogen inversion of the stereocenter is about 7 kcal/mol for a trialkylamine. The interconversion has been compared to the inversion of an open umbrella into a strong wind.
Amines of the type NHRR' and NRR′R″ are chiral: the nitrogen center bears four substituents counting the lone pair. Because of the low barrier to inversion, amines of the type NHRR' cannot be obtained in optical purity. For chiral tertiary amines, NRR′R″ can only be resolved when the R, R', and R″ groups are constrained in cyclic structures such as "N"-substituted aziridines (quaternary ammonium salts are resolvable).
Aromatic amines.
In aromatic amines ("anilines"), nitrogen is often nearly planar owing to conjugation of the lone pair with the aryl substituent. The C-N distance is correspondingly shorter. In aniline, the C-N distance is the same as the C-C distances.
Basicity.
Like ammonia, amines are bases. Compared to alkali metal hydroxides, amines are weaker.
The basicity of amines depends on:
Electronic effects.
Owing to inductive effects, the basicity of an amine might be expected to increase with the number of alkyl groups on the amine. Correlations are complicated owing to the effects of solvation which are opposite the trends for inductive effects. Solvation effects also dominate the basicity of aromatic amines (anilines). For anilines, the lone pair of electrons on nitrogen delocalizes into the ring, resulting in decreased basicity. Substituents on the aromatic ring, and their positions relative to the amino group, also affect basicity as seen in the table.
Solvation effects.
Solvation significantly affects the basicity of amines. N-H groups strongly interact with water, especially in ammonium ions. Consequently, the basicity of ammonia is enhanced by 1011 by solvation. The intrinsic basicity of amines, i.e. the situation where solvation is unimportant, has been evaluated in the gas phase. In the gas phase, amines exhibit the basicities predicted from the electron-releasing effects of the organic substituents. Thus tertiary amines are more basic than secondary amines, which are more basic than primary amines, and finally ammonia is least basic. The order of pKb's (basicities in water) does not follow this order. Similarly aniline is more basic than ammonia in the gas phase, but ten thousand times less so in aqueous solution.
In aprotic polar solvents such as DMSO, DMF, and acetonitrile the energy of solvation is not as high as in protic polar solvents like water and methanol. For this reason, the basicity of amines in these aprotic solvents is almost solely governed by the electronic effects.
Synthesis.
From alcohols.
Industrially significant alkyl amines are prepared from ammonia by alkylation with alcohols:
<chem>ROH + NH3 -> RNH2 + H2O</chem>
From alkyl and aryl halides.
Unlike the reaction of amines with alcohols the reaction of amines and ammonia with alkyl halides is used for synthesis in the laboratory:
<chem>RX + 2 R'NH2 -> RR'NH + [RR'NH2]X</chem>
In such reactions, which are more useful for alkyl iodides and bromides, the degree of alkylation is difficult to control such that one obtains mixtures of primary, secondary, and tertiary amines, as well as quaternary ammonium salts.
Selectivity can be improved via the Delépine reaction, although this is rarely employed on an industrial scale. Selectivity is also assured in the Gabriel synthesis, which involves organohalide reacting with potassium phthalimide.
Aryl halides are much less reactive toward amines and for that reason are more controllable. A popular way to prepare aryl amines is the Buchwald-Hartwig reaction.
From alkenes.
Disubstituted alkenes react with HCN in the presence of strong acids to give formamides, which can be decarbonylated. This method, the Ritter reaction, is used industrially to produce tertiary amines such as "tert"-octylamine.
Hydroamination of alkenes is also widely practiced. The reaction is catalyzed by zeolite-based solid acids.
Reductive routes.
Via the process of hydrogenation, unsaturated N-containing functional groups are reduced to amines using hydrogen in the presence of a nickel catalyst. Suitable groups include nitriles, azides, imines including oximes, amides, and nitro. In the case of nitriles, reactions are sensitive to acidic or alkaline conditions, which can cause hydrolysis of the group. is more commonly employed for the reduction of these same groups on the laboratory scale.
Many amines are produced from aldehydes and ketones via reductive amination, which can either proceed catalytically or stoichiometrically.
Aniline () and its derivatives are prepared by reduction of the nitroaromatics. In industry, hydrogen is the preferred reductant, whereas, in the laboratory, tin and iron are often employed.
Specialized methods.
Many methods exist for the preparation of amines, many of these methods being rather specialized.
Reactions.
Alkylation, acylation, and sulfonation, etc..
Aside from their basicity, the dominant reactivity of amines is their nucleophilicity. Most primary amines are good ligands for metal ions to give coordination complexes. Amines are alkylated by alkyl halides. Acyl chlorides and acid anhydrides react with primary and secondary amines to form amides (the "Schotten–Baumann reaction").
Similarly, with sulfonyl chlorides, one obtains sulfonamides. This transformation, known as the Hinsberg reaction, is a chemical test for the presence of amines.
Because amines are basic, they neutralize acids to form the corresponding ammonium salts . When formed from carboxylic acids and primary and secondary amines, these salts thermally dehydrate to form the corresponding amides.
formula_1
Amines undergo sulfamation upon treatment with sulfur trioxide or sources thereof:
<chem>R2NH + SO3 -> R2NSO3H</chem>
Diazotization.
Amines reacts with nitrous acid to give diazonium salts. The alkyl diazonium salts are of little importance because they are too unstable. The most important members are derivatives of aromatic amines such as aniline ("phenylamine") (A = aryl or naphthyl):
<chem>ANH2 + HNO2 + HX -> AN2+ + X- + 2 H2O</chem>
Anilines and naphthylamines form more stable diazonium salts, which can be isolated in the crystalline form. Diazonium salts undergo a variety of useful transformations involving replacement of the group with anions. For example, cuprous cyanide gives the corresponding nitriles:
<chem>AN2+ + Y- -> AY + N2</chem>
Aryldiazoniums couple with electron-rich aromatic compounds such as a phenol to form azo compounds. Such reactions are widely applied to the production of dyes.
Conversion to imines.
Imine formation is an important reaction. Primary amines react with ketones and aldehydes to form imines. In the case of formaldehyde (R' H), these products typically exist as cyclic trimers: <chem display=block>RNH2 + R'_2C=O -> R'_2C=NR + H2O</chem> Reduction of these imines gives secondary amines: <chem display=block>R'_2C=NR + H2 -> R'_2CH-NHR</chem>
Similarly, secondary amines react with ketones and aldehydes to form enamines: <chem display=block> R2NH + R'(R"CH2)C=O -> R"CH=C(NR2)R' + H2O</chem>
Mercuric ions reversibly oxidize tertiary amines with an α hydrogen to iminium ions: <chem display=block>Hg^2+ + R2NCH2R' <=> Hg + [R2N=CHR']+ + H+</chem>
Overview.
An overview of the reactions of amines is given below:
Biological activity.
Amines are ubiquitous in biology. The breakdown of amino acids releases amines, famously in the case of decaying fish which smell of trimethylamine. Many neurotransmitters are amines, including epinephrine, norepinephrine, dopamine, serotonin, and histamine. Protonated amino groups (–) are the most common positively charged moieties in proteins, specifically in the amino acid lysine. The anionic polymer DNA is typically bound to various amine-rich proteins. Additionally, the terminal charged primary ammonium on lysine forms salt bridges with carboxylate groups of other amino acids in polypeptides, which is one of the primary influences on the three-dimensional structures of proteins.
Amine hormones.
Hormones derived from the modification of amino acids are referred to as amine hormones. Typically, the original structure of the amino acid is modified such that a –COOH, or carboxyl, group is removed, whereas the –, or amine, group remains. Amine hormones are synthesized from the amino acids tryptophan or tyrosine.
Application of amines.
Dyes.
Primary aromatic amines are used as a starting material for the manufacture of azo dyes. It reacts with nitrous acid to form diazonium salt, which can undergo coupling reaction to form an azo compound. As azo-compounds are highly coloured, they are widely used in dyeing industries, such as:
Drugs.
Most drugs and drug candidates contain amine functional groups:
Gas treatment.
Aqueous monoethanolamine (MEA), diglycolamine (DGA), diethanolamine (DEA), diisopropanolamine (DIPA) and methyldiethanolamine (MDEA) are widely used industrially for removing carbon dioxide () and hydrogen sulfide (H2S) from natural gas and refinery process streams. They may also be used to remove from combustion gases and flue gases and may have potential for abatement of greenhouse gases. Related processes are known as sweetening.
Epoxy resin curing agents.
Amines are often used as epoxy resin curing agents. These include dimethylethylamine, cyclohexylamine, and a variety of diamines such as 4,4-diaminodicyclohexylmethane. Multifunctional amines such as tetraethylenepentamine and triethylenetetramine are also widely used in this capacity. The reaction proceeds by the lone pair of electrons on the amine nitrogen attacking the outermost carbon on the oxirane ring of the epoxy resin. This relieves ring strain on the epoxide and is the driving force of the reaction. Molecules with tertiary amine functionality are often used to accelerate the epoxy-amine curing reaction and include substances such as 2,4,6-Tris(dimethylaminomethyl)phenol. It has been stated that this is the most widely used room temperature accelerator for two-component epoxy resin systems.
Safety.
Low molecular weight simple amines, such as ethylamine, are toxic with between 100 and 1000 mg/kg. They are skin irritants, especially as some are easily absorbed through the skin. Amines are a broad class of compounds, and more complex members of the class can be extremely bioactive, for example strychnine.
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Absolute zero
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Absolute zero is the lowest possible temperature, a state at which a system's internal energy, and in ideal cases entropy, reach their minimum values. The Kelvin scale is defined so that absolute zero is 0 K, equivalent to −273.15 °C on the Celsius scale, and −459.67 °F on the Fahrenheit scale. The Kelvin and Rankine temperature scales set their zero points at absolute zero by design. This limit can be estimated by extrapolating the ideal gas law to the temperature at which the volume or pressure of a classical gas becomes zero.
At absolute zero, there is no thermal motion. However, due to quantum effects, the particles still exhibit minimal motion mandated by the Heisenberg uncertainty principle and, for a system of fermions, the Pauli exclusion principle. Even if absolute zero could be achieved, this residual quantum motion would persist.
Although absolute zero can be approached, it cannot be reached. Some isentropic processes, such as adiabatic expansion, can lower the system's temperature without relying on a colder medium. Nevertheless, the third law of thermodynamics implies that no physical process can reach absolute zero in a finite number of steps. As a system nears this limit, further reductions in temperature become increasingly difficult, regardless of the cooling method used. In the 21st century, scientists have achieved temperatures below 100 picokelvin (pK). At low temperatures, matter displays exotic quantum phenomena such as superconductivity, superfluidity, and Bose–Einstein condensation.
Ideal gas laws.
For an ideal gas, the pressure at constant volume decreases linearly with temperature, and the volume at constant pressure also decreases linearly with temperature. When these relationships are expressed using the Celsius scale, both pressure and volume extrapolate to zero at approximately −273.15 °C. This implies the existence of a lower bound on temperature, beyond which the gas would have negative pressure or volume—an unphysical result.
To resolve this, the concept of absolute temperature is introduced, with 0 kelvins defined as the point at which pressure or volume would vanish in an ideal gas. This temperature corresponds to −273.15 °C, and is referred to as absolute zero. The ideal gas law is therefore formulated in terms of absolute temperature to remain consistent with observed gas behavior and physical limits.
Absolute temperature scales.
Absolute temperature is conventionally measured in Kelvin scale (using Celsius-scaled increments) and, more rarely, in Rankine scale (using Fahrenheit-scaled increments). Absolute temperature measurement is uniquely determined by a multiplicative constant which specifies the size of the "degree", so the "ratios" of two absolute temperatures, "T"2/"T"1, are the same in all scales.
Absolute temperature also emerges naturally in statistical mechanics. In the Maxwell–Boltzmann, Fermi–Dirac, and Bose–Einstein distributions, absolute temperature appears in the exponential factor that determines how particles populate energy states. Specifically, the relative number of particles at a given energy "E" depends exponentially on "E/kT", where "k" is the Boltzmann constant and "T" is the absolute temperature.
Unattainability of absolute zero.
The third law of thermodynamics concerns the behavior of entropy as temperature approaches absolute zero. It states that the entropy of a system approaches a constant minimum at 0 K. For a perfect crystal, this minimum is taken to be zero, since the system would be in a state of perfect order with only one microstate available. In some systems, there may be more than one microstate at minimum energy and there is some residual entropy at 0 K.
Several other formulations of the third law exist. Nernst heat theorem holds that the change in entropy for any constant-temperature process tends to zero as the temperature approaches zero. A key consequence is that absolute zero cannot be reached, since removing heat becomes increasingly inefficient and entropy changes vanish. This unattainability principle means no physical process can cool a system to absolute zero in a finite number of steps or finite time.
Thermal properties at low temperatures.
Using the Debye model, the specific heat and entropy of a pure crystal are proportional to "T" 3, while the enthalpy and chemical potential are proportional to "T" 4 (Guggenheim, p. 111). These quantities drop toward their "T" = 0 limiting values and approach with "zero" slopes. For the specific heats at least, the limiting value itself is definitely zero, as borne out by experiments to below 10 K. Even the less detailed Einstein model shows this curious drop in specific heats. In fact, all specific heats vanish at absolute zero, not just those of crystals. Likewise for the coefficient of thermal expansion. Maxwell's relations show that various other quantities also vanish. These phenomena were unanticipated.
One model that estimates the properties of an electron gas at absolute zero in metals is the Fermi gas. The electrons, being fermions, must be in different quantum states, which leads the electrons to get very high typical velocities, even at absolute zero. The maximum energy that electrons can have at absolute zero is called the Fermi energy. The Fermi temperature is defined as this maximum energy divided by the Boltzmann constant, and is on the order of 80,000 K for typical electron densities found in metals. For temperatures significantly below the Fermi temperature, the electrons behave in almost the same way as at absolute zero. This explains the failure of the classical equipartition theorem for metals that eluded classical physicists in the late 19th century.
Gibbs free energy.
Since the relation between changes in Gibbs free energy ("G"), the enthalpy ("H") and the entropy is
formula_1
thus, as "T" decreases, Δ"G" and Δ"H" approach each other (so long as Δ"S" is bounded). Experimentally, it is found that all spontaneous processes (including chemical reactions) result in a decrease in "G" as they proceed toward equilibrium. If Δ"S" and/or "T" are small, the condition Δ"G" < 0 may imply that Δ"H" < 0, which would indicate an exothermic reaction. However, this is not required; endothermic reactions can proceed spontaneously if the "T"Δ"S" term is large enough.
Moreover, the slopes of the derivatives of Δ"G" and Δ"H" converge and are equal to zero at "T" = 0. This ensures that Δ"G" and Δ"H" are nearly the same over a considerable range of temperatures and justifies the approximate empirical Principle of Thomsen and Berthelot, which states that "the equilibrium state to which a system proceeds is the one that evolves the greatest amount of heat", i.e., an actual process is the "most exothermic one" (Callen, pp. 186–187).
Zero-point energy.
Even at absolute zero, a quantum system retains a minimum amount of energy due to the Heisenberg uncertainty principle, which prevents particles from having both perfectly defined position and momentum. This residual energy is known as zero-point energy. In the case of the quantum harmonic oscillator, a standard model for vibrations in atoms and molecules, the uncertainty in a particle's momentum implies it must retain some kinetic energy, while the uncertainty in its position contributes to potential energy. As a result, such a system has a nonzero energy at absolute zero.
Zero-point energy helps explain certain physical phenomena. For example, liquid helium does not solidify at normal pressure, even at temperatures near absolute zero. The large zero-point motion of helium atoms, caused by their low mass and weak interatomic forces, prevents them from settling into a solid structure. Only under high pressure does helium solidify, as the atoms are forced closer together and the interatomic forces grow stronger.
History.
One of the first to discuss the possibility of an absolute minimal temperature was Robert Boyle. His 1665 "New Experiments and Observations touching Cold", articulated the dispute known as the "primum frigidum". The concept was well known among naturalists of the time. Some contended an absolute minimum temperature occurred within earth (as one of the four classical elements), others within water, others air, and some more recently within nitre. But all of them seemed to agree that, "There is some body or other that is of its own nature supremely cold and by participation of which all other bodies obtain that quality."
Limit to the "degree of cold".
The question of whether there is a limit to the degree of coldness possible, and, if so, where the zero must be placed, was first addressed by the French physicist Guillaume Amontons in 1703, in connection with his improvements in the air thermometer. His instrument indicated temperatures by the height at which a certain mass of air sustained a column of mercury—the pressure, or "spring" of the air varying with temperature. Amontons therefore argued that the zero of his thermometer would be that temperature at which the spring of the air was reduced to nothing. He used a scale that marked the boiling point of water at +73 and the melting point of ice at +, so that the zero was equivalent to about −240 on the Celsius scale. Amontons held that the absolute zero cannot be reached, so never attempted to compute it explicitly. The value of −240 °C, or "431 divisions [in Fahrenheit's thermometer] below the cold of freezing water" was published by George Martine in 1740.
This close approximation to the modern value of −273.15 °C for the zero of the air thermometer was further improved upon in 1779 by Johann Heinrich Lambert, who observed that might be regarded as absolute cold.
Values of this order for the absolute zero were not, however, universally accepted about this period. Pierre-Simon Laplace and Antoine Lavoisier, in their 1780 treatise on heat, arrived at values ranging from 1,500 to 3,000 below the freezing point of water, and thought that in any case it must be at least 600 below. John Dalton in his "Chemical Philosophy" gave ten calculations of this value, and finally adopted −3,000 °C as the natural zero of temperature.
Charles's law.
From 1787 to 1802, it was determined by Jacques Charles (unpublished), John Dalton, and Joseph Louis Gay-Lussac that, at constant pressure, ideal gases expanded or contracted their volume linearly (Charles's law) by about 1/273 parts per degree Celsius of temperature's change up or down, between 0° and 100° C. This suggested that the volume of a gas cooled at about −273 °C would reach zero.
Lord Kelvin's work.
After James Prescott Joule had determined the mechanical equivalent of heat, Lord Kelvin approached the question from an entirely different point of view, and in 1848 devised a scale of absolute temperature that was independent of the properties of any particular substance and was based on Carnot's theory of the Motive Power of Heat and data published by Henri Victor Regnault. It followed from the principles on which this scale was constructed that its zero was placed at −273 °C, at almost precisely the same point as the zero of the air thermometer, where the air volume would reach "nothing". This value was not immediately accepted; values ranging from to , derived from laboratory measurements and observations of astronomical refraction, remained in use in the early 20th century.
The race to absolute zero.
With a better theoretical understanding of absolute zero, scientists were eager to reach this temperature in the lab. By 1845, Michael Faraday had managed to liquefy most gases then known to exist, and reached a new record for lowest temperatures by reaching . Faraday believed that certain gases, such as oxygen, nitrogen, and hydrogen, were permanent gases and could not be liquefied. Decades later, in 1873 Dutch theoretical scientist Johannes Diderik van der Waals demonstrated that these gases could be liquefied, but only under conditions of very high pressure and very low temperatures. In 1877, Louis Paul Cailletet in France and Raoul Pictet in Switzerland succeeded in producing the first droplets of liquid air at . This was followed in 1883 by the production of liquid oxygen by the Polish professors Zygmunt Wróblewski and Karol Olszewski.
Scottish chemist and physicist James Dewar and Dutch physicist Heike Kamerlingh Onnes took on the challenge to liquefy the remaining gases, hydrogen and helium. In 1898, after 20 years of effort, Dewar was the first to liquefy hydrogen, reaching a new low-temperature record of . However, Kamerlingh Onnes, his rival, was the first to liquefy helium, in 1908, using several precooling stages and the Hampson–Linde cycle. He lowered the temperature to the boiling point of helium . By reducing the pressure of the liquid helium, he achieved an even lower temperature, near 1.5 K. These were the coldest temperatures achieved on Earth at the time and his achievement earned him the Nobel Prize in 1913. Kamerlingh Onnes would continue to study the properties of materials at temperatures near absolute zero, describing superconductivity and superfluids for the first time.
Negative temperatures.
Temperatures below zero on the Celsius or Fahrenheit scales are simply colder than the zero points of those scales. In contrast, certain isolated systems can achieve negative thermodynamic temperatures (in kelvins), which are not colder than absolute zero, but paradoxically hotter than any positive temperature. If a negative-temperature system and a positive-temperature system come in contact, heat flows from the negative to the positive-temperature system.
Negative temperatures can only occur in systems that have an upper limit to the energy they can contain. In these cases, adding energy can decrease entropy, reversing the usual relationship between energy and temperature. This leads to a negative thermodynamic temperature. However, such conditions only arise in specialized, quasi-equilibrium systems such as collections of spins in a magnetic field. In contrast, ordinary systems with translational or vibrational motion have no upper energy limit, so their temperatures are always positive.
Very low temperatures.
The average temperature of the universe today is approximately , based on measurements of cosmic microwave background radiation. Standard models of the future expansion of the universe predict that the average temperature of the universe is decreasing over time. This temperature is calculated as the mean density of energy in space; it should not be confused with the mean electron temperature (total energy divided by particle count) which has increased over time.
Absolute zero cannot be achieved, although it is possible to reach temperatures close to it through the use of evaporative cooling, cryocoolers, dilution refrigerators, and nuclear adiabatic demagnetization. The use of laser cooling has produced temperatures of less than a billionth of a kelvin. At very low temperatures in the vicinity of absolute zero, matter exhibits many unusual properties, including superconductivity, superfluidity, and Bose–Einstein condensation. To study such phenomena, scientists have worked to obtain even lower temperatures.
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Adiabatic process
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An adiabatic process ("adiabatic" ) is a type of thermodynamic process that occurs without transferring heat between the thermodynamic system and its environment. Unlike an isothermal process, an adiabatic process transfers energy to the surroundings only as work and/or mass flow. As a key concept in thermodynamics, the adiabatic process supports the theory that explains the first law of thermodynamics. The opposite term to "adiabatic" is "diabatic".
Some chemical and physical processes occur too rapidly for energy to enter or leave the system as heat, allowing a convenient "adiabatic approximation". For example, the adiabatic flame temperature uses this approximation to calculate the upper limit of flame temperature by assuming combustion loses no heat to its surroundings.
In meteorology, adiabatic expansion and cooling of moist air, which can be triggered by winds flowing up and over a mountain for example, can cause the water vapor pressure to exceed the saturation vapor pressure. Expansion and cooling beyond the saturation vapor pressure is often idealized as a "pseudo-adiabatic process" whereby excess vapor instantly precipitates into water droplets. The change in temperature of air undergoing pseudo-adiabatic expansion differs from air undergoing adiabatic expansion because latent heat is released by precipitation.
Description.
A process without transfer of heat to or from a system, so that , is called adiabatic, and such a system is said to be adiabatically isolated. The simplifying assumption frequently made is that a process is adiabatic. For example, the compression of a gas within a cylinder of an engine is assumed to occur so rapidly that on the time scale of the compression process, little of the system's energy can be transferred out as heat to the surroundings. Even though the cylinders are not insulated and are quite conductive, that process is idealized to be adiabatic. The same can be said to be true for the expansion process of such a system.
The assumption of adiabatic isolation is useful and often combined with other such idealizations to calculate a good first approximation of a system's behaviour. For example, according to Laplace, when sound travels in a gas, there is no time for heat conduction in the medium, and so the propagation of sound is adiabatic. For such an adiabatic process, the modulus of elasticity (Young's modulus) can be expressed as , where is the ratio of specific heats at constant pressure and at constant volume () and is the pressure of the gas.
Various applications of the adiabatic assumption.
For a closed system, one may write the first law of thermodynamics as , where denotes the change of the system's internal energy, the quantity of energy added to it as heat, and the work done by the system on its surroundings.
Naturally occurring adiabatic processes are irreversible (entropy is produced).
The transfer of energy as work into an adiabatically isolated system can be imagined as being of two idealized extreme kinds. In one such kind, no entropy is produced within the system (no friction, viscous dissipation, etc.), and the work is only pressure-volume work (denoted by ). In nature, this ideal kind occurs only approximately because it demands an infinitely slow process and no sources of dissipation.
The other extreme kind of work is isochoric work (), for which energy is added as work solely through friction or viscous dissipation within the system. A stirrer that transfers energy to a viscous fluid of an adiabatically isolated system with rigid walls, without phase change, will cause a rise in temperature of the fluid, but that work is not recoverable. Isochoric work is irreversible. The second law of thermodynamics observes that a natural process, of transfer of energy as work, always consists at least of isochoric work and often both of these extreme kinds of work. Every natural process, adiabatic or not, is irreversible, with , as friction or viscosity are always present to some extent.
Adiabatic compression and expansion.
The adiabatic compression of a gas causes a rise in temperature of the gas. Adiabatic expansion against pressure, or a spring, causes a drop in temperature. In contrast, free expansion is an isothermal process for an ideal gas.
Adiabatic compression occurs when the pressure of a gas is increased by work done on it by its surroundings, e.g., a piston compressing a gas contained within a cylinder and raising the temperature where in many practical situations heat conduction through walls can be slow compared with the compression time. This finds practical application in diesel engines which rely on the lack of heat dissipation during the compression stroke to elevate the fuel vapor temperature sufficiently to ignite it.
Adiabatic compression occurs in the Earth's atmosphere when an air mass descends, for example, in a Katabatic wind, Foehn wind, or Chinook wind flowing downhill over a mountain range. When a parcel of air descends, the pressure on the parcel increases. Because of this increase in pressure, the parcel's volume decreases and its temperature increases as work is done on the parcel of air, thus increasing its internal energy, which manifests itself by a rise in the temperature of that mass of air. The parcel of air can only slowly dissipate the energy by conduction or radiation (heat), and to a first approximation it can be considered adiabatically isolated and the process an adiabatic process.
Adiabatic expansion occurs when the pressure on an adiabatically isolated system is decreased, allowing it to expand in size, thus causing it to do work on its surroundings. When the pressure applied on a parcel of gas is reduced, the gas in the parcel is allowed to expand; as the volume increases, the temperature falls as its internal energy decreases. Adiabatic expansion occurs in the Earth's atmosphere with orographic lifting and lee waves, and this can form pilei or lenticular clouds.
Due in part to adiabatic expansion in mountainous areas, snowfall infrequently occurs in some parts of the Sahara desert.
Adiabatic expansion does not have to involve a fluid. One technique used to reach very low temperatures (thousandths and even millionths of a degree above absolute zero) is via adiabatic demagnetisation, where the change in magnetic field on a magnetic material is used to provide adiabatic expansion. Also, the contents of an expanding universe can be described (to first order) as an adiabatically expanding fluid. (See heat death of the universe.)
Rising magma also undergoes adiabatic expansion before eruption, particularly significant in the case of magmas that rise quickly from great depths such as kimberlites.
In the Earth's convecting mantle (the asthenosphere) beneath the lithosphere, the mantle temperature is approximately an adiabat. The slight decrease in temperature with shallowing depth is due to the decrease in pressure the shallower the material is in the Earth.
Such temperature changes can be quantified using the ideal gas law, or the hydrostatic equation for atmospheric processes.
In practice, no process is truly adiabatic. Many processes rely on a large difference in time scales of the process of interest and the rate of heat dissipation across a system boundary, and thus are approximated by using an adiabatic assumption. There is always some heat loss, as no perfect insulators exist.
Ideal gas (reversible process).
The mathematical equation for an ideal gas undergoing a reversible (i.e., no entropy generation) adiabatic process can be represented by the polytropic process equation
formula_1
where is pressure, is volume, and is the adiabatic index or heat capacity ratio defined as
formula_2
Here is the specific heat for constant pressure, is the specific heat for constant volume, and is the number of degrees of freedom (3 for a monatomic gas, 5 for a diatomic gas or a gas of linear molecules such as carbon dioxide).
For a monatomic ideal gas, , and for a diatomic gas (such as nitrogen and oxygen, the main components of air), . Note that the above formula is only applicable to classical ideal gases (that is, gases far above absolute zero temperature) and not Bose–Einstein or Fermi gases.
One can also use the ideal gas law to rewrite the above relationship between and as
formula_3
where "T" is the absolute or thermodynamic temperature.
Example of adiabatic compression.
The compression stroke in a gasoline engine can be used as an example of adiabatic compression. The model assumptions are: the uncompressed volume of the cylinder is one litre (1 L = 1000 cm3 = 0.001 m3); the gas within is the air consisting of molecular nitrogen and oxygen only (thus a diatomic gas with 5 degrees of freedom, and so ); the compression ratio of the engine is 10:1 (that is, the 1 L volume of uncompressed gas is reduced to 0.1 L by the piston); and the uncompressed gas is at approximately room temperature and pressure (a warm room temperature of ~27 °C, or 300 K, and a pressure of 1 bar = 100 kPa, i.e. typical sea-level atmospheric pressure).
formula_4
so the adiabatic constant for this example is about
The gas is now compressed to a 0.1 L (0.0001 m3) volume, which we assume happens quickly enough that no heat enters or leaves the gas through the walls. The adiabatic constant remains the same, but with the resulting pressure unknown
formula_5
We can now solve for the final pressure
formula_6
or 25.1 bar. This pressure increase is more than a simple 10:1 compression ratio would indicate; this is because the gas is not only compressed, but the work done to compress the gas also increases its internal energy, which manifests itself by a rise in the gas temperature and an additional rise in pressure above what would result from a simplistic calculation of 10 times the original pressure.
We can solve for the temperature of the compressed gas in the engine cylinder as well, using the ideal gas law, "PV" = "nRT" ("n" is amount of gas in moles and "R" the gas constant for that gas). Our initial conditions being 100 kPa of pressure, 1 L volume, and 300 K of temperature, our experimental constant ("nR") is:
formula_7
We know the compressed gas has = 0.1 L and = , so we can solve for temperature:
formula_8
That is a final temperature of 753 K, or 479 °C, or 896 °F, well above the ignition point of many fuels. This is why a high-compression engine requires fuels specially formulated to not self-ignite (which would cause engine knocking when operated under these conditions of temperature and pressure), or that a supercharger with an intercooler to provide a pressure boost but with a lower temperature rise would be advantageous. A diesel engine operates under even more extreme conditions, with compression ratios of 16:1 or more being typical, in order to provide a very high gas pressure, which ensures immediate ignition of the injected fuel.
Adiabatic free expansion of a gas.
For an adiabatic free expansion of an ideal gas, the gas is contained in an insulated container and then allowed to expand in a vacuum. Because there is no external pressure for the gas to expand against, the work done by or on the system is zero. Since this process does not involve any heat transfer or work, the first law of thermodynamics then implies that the net internal energy change of the system is zero. For an ideal gas, the temperature remains constant because the internal energy only depends on temperature in that case. Since at constant temperature, the entropy is proportional to the volume, the entropy increases in this case, therefore this process is irreversible.
Derivation of "P"–"V" relation for adiabatic compression and expansion.
The definition of an adiabatic process is that heat transfer to the system is zero, . Then, according to the first law of thermodynamics,
where is the change in the internal energy of the system and is work done "by" the system. Any work () done must be done at the expense of internal energy , since no heat is being supplied from the surroundings. Pressure–volume work done "by" the system is defined as
However, does not remain constant during an adiabatic process but instead changes along with .
It is desired to know how the values of and relate to each other as the adiabatic process proceeds. For an ideal gas (recall ideal gas law ) the internal energy is given by
where is the number of degrees of freedom divided by 2, is the universal gas constant and is the number of moles in the system (a constant).
Differentiating equation (a3) yields
Equation (a4) is often expressed as because .
Now substitute equations (a2) and (a4) into equation (a1) to obtain
formula_9
factorize :
formula_10
and divide both sides by :
formula_11
After integrating the left and right sides from to and from to and changing the sides respectively,
formula_12
Exponentiate both sides, substitute with , the heat capacity ratio
formula_13
and eliminate the negative sign to obtain
formula_14
Therefore,
formula_15
and
formula_16
At the same time, the work done by the pressure–volume changes as a result from this process, is equal to
Since we require the process to be adiabatic, the following equation needs to be true
By the previous derivation,
Rearranging (b4) gives
formula_17
Substituting this into (b2) gives
formula_18
Integrating, we obtain the expression for work,
formula_19
Substituting in the second term,
formula_20
Rearranging,
formula_21
Using the ideal gas law and assuming a constant molar quantity (as often happens in practical cases),
formula_22
By the continuous formula,
formula_23
or
formula_24
Substituting into the previous expression for ,
formula_25
Substituting this expression and (b1) in (b3) gives
formula_26
Simplifying,
formula_27
Derivation of discrete formula and work expression.
The change in internal energy of a system, measured from state 1 to state 2, is equal to
At the same time, the work done by the pressure–volume changes as a result from this process, is equal to
Since we require the process to be adiabatic, the following equation needs to be true
By the previous derivation,
Rearranging (c4) gives
formula_17
Substituting this into (c2) gives
formula_18
Integrating we obtain the expression for work,
formula_30
Substituting in second term,
formula_20
Rearranging,
formula_21
Using the ideal gas law and assuming a constant molar quantity (as often happens in practical cases),
formula_22
By the continuous formula,
formula_23
or
formula_24
Substituting into the previous expression for ,
formula_25
Substituting this expression and (c1) in (c3) gives
formula_26
Simplifying,
formula_27
Graphing adiabats.
An adiabat is a curve of constant entropy in a diagram. Some properties of adiabats on a "P"–"V" diagram are indicated. These properties may be read from the classical behaviour of ideal gases, except in the region where "PV" becomes small (low temperature), where quantum effects become important.
Etymology.
The term "adiabatic" () is an anglicization of the Greek term ἀδιάβατος "impassable" (used by Xenophon of rivers). It is used in the thermodynamic sense by Rankine (1866), and adopted by Maxwell in 1871 (explicitly attributing the term to Rankine).
The etymological origin corresponds here to an impossibility of transfer of energy as heat and of transfer of matter across the wall.
The Greek word ἀδιάβατος is formed from privative ἀ- ("not") and διαβατός, "passable", in turn deriving from διά ("through"), and βαῖνειν ("to walk, go, come").
Furthermore, in atmospheric thermodynamics, a diabatic process is one in which heat is exchanged. An adiabatic process is the opposite – a process in which no heat is exchanged.
Conceptual significance in thermodynamic theory.
The adiabatic process has been important for thermodynamics since its early days. It was important in the work of Joule because it provided a way of nearly directly relating quantities of heat and work.
Energy can enter or leave a thermodynamic system enclosed by walls that prevent mass transfer only as heat or work. Therefore, a quantity of work in such a system can be related almost directly to an equivalent quantity of heat in a cycle of two limbs. The first limb is an isochoric adiabatic work process increasing the system's internal energy; the second, an isochoric and workless heat transfer returning the system to its original state. Accordingly, Rankine measured quantity of heat in units of work, rather than as a calorimetric quantity. In 1854, Rankine used a quantity that he called "the thermodynamic function" that later was called entropy, and at that time he wrote also of the "curve of no transmission of heat", which he later called an adiabatic curve. Besides its two isothermal limbs, Carnot's cycle has two adiabatic limbs.
For the foundations of thermodynamics, the conceptual importance of this was emphasized by Bryan, by Carathéodory, and by Born. The reason is that calorimetry presupposes a type of temperature as already defined before the statement of the first law of thermodynamics, such as one based on empirical scales. Such a presupposition involves making the distinction between empirical temperature and absolute temperature. Rather, the definition of absolute thermodynamic temperature is best left till the second law is available as a conceptual basis.
In the eighteenth century, the law of conservation of energy was not yet fully formulated or established, and the nature of heat was debated. One approach to these problems was to regard heat, measured by calorimetry, as a primary substance that is conserved in quantity. By the middle of the nineteenth century, it was recognized as a form of energy, and the law of conservation of energy was thereby also recognized. The view that eventually established itself, and is currently regarded as right, is that the law of conservation of energy is a primary axiom, and that heat is to be analyzed as consequential. In this light, heat cannot be a component of the total energy of a single body because it is not a state variable but, rather, a variable that describes a transfer between two bodies. The adiabatic process is important because it is a logical ingredient of this current view.
Divergent usages of the word "adiabatic".
This present article is written from the viewpoint of macroscopic thermodynamics, and the word "adiabatic" is used in this article in the traditional way of thermodynamics, introduced by Rankine. It is pointed out in the present article that, for example, if a compression of a gas is rapid, then there is little time for heat transfer to occur, even when the gas is not adiabatically isolated by a definite wall. In this sense, a rapid compression of a gas is sometimes approximately or loosely said to be "adiabatic", though often far from isentropic, even when the gas is not adiabatically isolated by a definite wall.
Some authors, like Pippard, recommend using "adiathermal" to refer to processes where no heat-exchange occurs (such as Joule expansion), and "adiabatic" to reversible quasi-static adiathermal processes (so that rapid compression of a gas is "not" "adiabatic"). And Laidler has summarized the complicated etymology of "adiabatic".
Quantum mechanics and quantum statistical mechanics, however, use the word "adiabatic" in a very different sense, one that can at times seem almost opposite to the classical thermodynamic sense. In quantum theory, the word "adiabatic" can mean something perhaps near isentropic, or perhaps near quasi-static, but the usage of the word is very different between the two disciplines.
On the one hand, in quantum theory, if a perturbative element of compressive work is done almost infinitely slowly (that is to say quasi-statically), it is said to have been done "adiabatically". The idea is that the shapes of the eigenfunctions change slowly and continuously, so that no quantum jump is triggered, and the change is virtually reversible. While the occupation numbers are unchanged, nevertheless there is change in the energy levels of one-to-one corresponding, pre- and post-compression, eigenstates. Thus a perturbative element of work has been done without heat transfer and without introduction of random change within the system. For example, Max Born writes
On the other hand, in quantum theory, if a perturbative element of compressive work is done rapidly, it changes the occupation numbers and energies of the eigenstates in proportion to the transition moment integral and in accordance with time-dependent perturbation theory, as well as perturbing the functional form of the eigenstates themselves. In that theory, such a rapid change is said not to be "adiabatic", and the contrary word "diabatic" is applied to it.
Recent research suggests that the power absorbed from the perturbation corresponds to the rate of these non-adiabatic transitions. This corresponds to the classical process of energy transfer in the form of heat, but with the relative time scales reversed in the quantum case. Quantum adiabatic processes occur over relatively long time scales, while classical adiabatic processes occur over relatively short time scales. It should also be noted that the concept of 'heat' (in reference to the quantity of thermal energy transferred) breaks down at the quantum level, and the specific form of energy (typically electromagnetic) must be considered instead. The small or negligible absorption of energy from the perturbation in a quantum adiabatic process provides a good justification for identifying it as the quantum analogue of adiabatic processes in classical thermodynamics, and for the reuse of the term.
In classical thermodynamics, such a rapid change would still be called adiabatic because the system is adiabatically isolated, and there is no transfer of energy as heat. The strong irreversibility of the change, due to viscosity or other entropy production, does not impinge on this classical usage.
Thus for a mass of gas, in macroscopic thermodynamics, words are so used that a compression is sometimes loosely or approximately said to be adiabatic if it is rapid enough to avoid significant heat transfer, even if the system is not adiabatically isolated. But in quantum statistical theory, a compression is not called adiabatic if it is rapid, even if the system is adiabatically isolated in the classical thermodynamic sense of the term. The words are used differently in the two disciplines, as stated just above.
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Amide
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In organic chemistry, an amide, also known as an organic amide or a carboxamide, is a compound with the general formula , where R, R', and R″ represent any group, typically organyl groups or hydrogen atoms. The amide group is called a peptide bond when it is part of the main chain of a protein, and an isopeptide bond when it occurs in a side chain, as in asparagine and glutamine. It can be viewed as a derivative of a carboxylic acid () with the hydroxyl group () replaced by an amino group (); or, equivalently, an acyl (alkanoyl) group () joined to an amino group.
Common amides are formamide (), acetamide (), benzamide (), and dimethylformamide (). Some uncommon examples of amides are "N"-chloroacetamide () and chloroformamide ().
Amides are qualified as primary, secondary, and tertiary according to the number of acyl groups bounded to the nitrogen atom.
Nomenclature.
The core of amides is called the amide group (specifically, carboxamide group).
In the usual nomenclature, one adds the term "amide" to the stem of the parent acid's name. For instance, the amide derived from acetic acid is named acetamide (CH3CONH2). IUPAC recommends ethanamide, but this and related formal names are rarely encountered. When the amide is derived from a primary or secondary amine, the substituents on nitrogen are indicated first in the name. Thus, the amide formed from dimethylamine and acetic acid is "N","N"-dimethylacetamide (CH3CONMe2, where Me = CH3). Usually even this name is simplified to dimethylacetamide. Cyclic amides are called lactams; they are necessarily secondary or tertiary amides.
Applications.
Amides are pervasive in nature and technology. Proteins and important plastics like nylons, aramids, Twaron, and Kevlar are polymers whose units are connected by amide groups (polyamides); these linkages are easily formed, confer structural rigidity, and resist hydrolysis. Amides include many other important biological compounds, as well as many drugs like paracetamol, penicillin and LSD. Low-molecular-weight amides, such as dimethylformamide, are common solvents.
Structure and bonding.
The lone pair of electrons on the nitrogen atom is delocalized into the Carbonyl group, thus forming a partial double bond between nitrogen and carbon. In fact the O, C and N atoms have molecular orbitals occupied by delocalized electrons, forming a conjugated system. Consequently, the three bonds of the nitrogen in amides is not pyramidal (as in the amines) but planar. This planar restriction prevents rotations about the N linkage and thus has important consequences for the mechanical properties of bulk material of such molecules, and also for the configurational properties of macromolecules built by such bonds. The inability to rotate distinguishes amide groups from ester groups which allow rotation and thus create more flexible bulk material.
The C-C(O)NR2 core of amides is planar. The C=O distance is shorter than the C-N distance by almost 10%. The structure of an amide can be described also as a resonance between two alternative structures: neutral (A) and zwitterionic (B).
It is estimated that for acetamide, structure A makes a 62% contribution to the structure, while structure B makes a 28% contribution (these figures do not sum to 100% because there are additional less-important resonance forms that are not depicted above). There is also a hydrogen bond present between the hydrogen and nitrogen atoms in the active groups. Resonance is largely prevented in the very strained quinuclidone.
In their IR spectra, amides exhibit a moderately intense "ν"CO band near 1650 cm−1. The energy of this band is about 60 cm−1 lower than for the "ν"CO of esters and ketones. This difference reflects the contribution of the zwitterionic resonance structure.
Basicity.
Compared to amines, amides are very weak bases. While the conjugate acid of an amine has a p"K"a of about 9.5, the conjugate acid of an amide has a p"K"a around −0.5. Therefore, compared to amines, amides do not have acid–base properties that are as noticeable in water. This relative lack of basicity is explained by the withdrawing of electrons from the amine by the carbonyl. On the other hand, amides are much stronger bases than carboxylic acids, esters, aldehydes, and ketones (their conjugate acids' p"K"as are between −6 and −10).
The proton of a primary or secondary amide does not dissociate readily; its p"K"a is usually well above 15. Conversely, under extremely acidic conditions, the carbonyl oxygen can become protonated with a p"K"a of roughly −1. It is not only because of the positive charge on the nitrogen but also because of the negative charge on the oxygen gained through resonance.
Hydrogen bonding and solubility.
Because of the greater electronegativity of oxygen than nitrogen, the carbonyl (C=O) is a stronger dipole than the N–C dipole. The presence of a C=O dipole and, to a lesser extent a N–C dipole, allows amides to act as H-bond acceptors. In primary and secondary amides, the presence of N–H dipoles allows amides to function as H-bond donors as well. Thus amides can participate in hydrogen bonding with water and other protic solvents; the oxygen atom can accept hydrogen bonds from water and the N–H hydrogen atoms can donate H-bonds. As a result of interactions such as these, the water solubility of amides is greater than that of corresponding hydrocarbons. These hydrogen bonds also have an important role in the secondary structure of proteins.
The solubilities of amides and esters are roughly comparable. Typically amides are less soluble than comparable amines and carboxylic acids since these compounds can both donate and accept hydrogen bonds. Tertiary amides, with the important exception of "N","N"-dimethylformamide, exhibit low solubility in water.
Reactions.
Amides do not readily participate in nucleophilic substitution reactions. Amides are stable to water, and are roughly 100 times more stable towards hydrolysis than esters. Amides can, however, be hydrolyzed to carboxylic acids in the presence of acid or base. The stability of amide bonds has biological implications, since the amino acids that make up proteins are linked with amide bonds. Amide bonds are resistant enough to hydrolysis to maintain protein structure in aqueous environments but are susceptible to catalyzed hydrolysis.
Primary and secondary amides do not react usefully with carbon nucleophiles. Instead, Grignard reagents and organolithiums deprotonate an amide N-H bond. Tertiary amides do not experience this problem, and react with carbon nucleophiles to give ketones; the amide anion (NR2−) is a very strong base and thus a very poor leaving group, so nucleophilic attack only occurs once. When reacted with carbon nucleophiles, "N","N"-dimethylformamide (DMF) can be used to introduce a formyl group.
Here, phenyllithium 1 attacks the carbonyl group of DMF 2, giving tetrahedral intermediate 3. Because the dimethylamide anion is a poor leaving group, the intermediate does not collapse and another nucleophilic addition does not occur. Upon acidic workup, the alkoxide is protonated to give 4, then the amine is protonated to give 5. Elimination of a neutral molecule of dimethylamine and loss of a proton give benzaldehyde, 6.
Hydrolysis.
Amides hydrolyse in hot alkali as well as in strong acidic conditions. Acidic conditions yield the carboxylic acid and the ammonium ion while basic hydrolysis yield the carboxylate ion and ammonia. The protonation of the initially generated amine under acidic conditions and the deprotonation of the initially generated carboxylic acid under basic conditions render these processes non-catalytic and irreversible. Electrophiles other than protons react with the carbonyl oxygen. This step often precedes hydrolysis, which is catalyzed by both Brønsted acids and Lewis acids. Peptidase enzymes and some synthetic catalysts often operate by attachment of electrophiles to the carbonyl oxygen.
Synthesis.
From carboxylic acids and related compounds.
Amides are usually prepared by coupling a carboxylic acid with an amine. The direct reaction generally requires high temperatures to drive off the water:
Esters are far superior substrates relative to carboxylic acids.
Further "activating" both acid chlorides (Schotten-Baumann reaction) and anhydrides (Lumière–Barbier method) react with amines to give amides:
Peptide synthesis use coupling agents such as HATU, HOBt, or PyBOP.
From nitriles.
The hydrolysis of nitriles is conducted on an industrial scale to produce fatty amides. Laboratory procedures are also available.
Specialty routes.
Many specialized methods also yield amides. A variety of reagents, e.g. tris(2,2,2-trifluoroethyl) borate have been developed for specialized applications.
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Animism
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Animism (from meaning 'breath, spirit, life') is the belief that objects, places, and creatures all possess a distinct spiritual essence. Animism perceives all things—animals, plants, rocks, rivers, weather systems, human handiwork, and in some cases words—as being animated, having agency and free will. Animism is used in anthropology of religion as a term for the belief system of many Indigenous peoples in contrast to the relatively more recent development of organized religions. Animism is a metaphysical belief which focuses on the supernatural universe: specifically, on the concept of the immaterial soul.
Although each culture has its own mythologies and rituals, animism is said to describe the most common, foundational thread of indigenous peoples' "spiritual" or "supernatural" perspectives. The animistic perspective is so widely held and inherent to most indigenous peoples that they often do not even have a word in their languages that corresponds to "animism" (or even "religion"). The term "animism" is an anthropological construct.
Largely due to such ethnolinguistic and cultural discrepancies, opinions differ on whether animism refers to an ancestral mode of experience common to indigenous peoples around the world or to a full-fledged religion in its own right. The currently accepted definition of animism was only developed in the late 19th century (1871) by Edward Tylor. It is "one of anthropology's earliest concepts, if not the first".
Animism encompasses beliefs that all material phenomena have agency, that there exists no categorical distinction between the spiritual and physical world, and that soul, spirit, or sentience exists not only in humans but also in other animals, plants, rocks, geographic features (such as mountains and rivers), and other entities of the natural environment. Examples include water sprites, vegetation deities, and tree spirits, among others. Animism may further attribute a life force to abstract concepts such as words, true names, or metaphors in mythology. Some members of the non-tribal world also consider themselves animists, such as author Daniel Quinn, sculptor Lawson Oyekan, and many contemporary Pagans.
Etymology.
English anthropologist Sir Edward Tylor initially wanted to describe the phenomenon as spiritualism, but he realized that it would cause confusion with the modern religion of spiritualism, which was then prevalent across Western nations. He adopted the term animism from the writings of German scientist Georg Ernst Stahl, who had developed the term "" in 1708 as a biological theory that souls formed the vital principle, and that the normal phenomena of life and the abnormal phenomena of disease could be traced to spiritual causes.
The origin of the word comes from the Latin word , which means "life" or "soul."
The first known usage in English appeared in 1819.
"Old animism" definitions.
Earlier anthropological perspectives, which have since been termed the old animism, were concerned with knowledge on what is alive and what factors make something alive. The old animism assumed that animists were individuals who were unable to understand the difference between persons and things. Critics of the old animism have accused it of preserving "colonialist and dualistic worldviews and rhetoric".
Edward Tylor's definition.
The idea of animism was developed by anthropologist Sir Edward Tylor through his 1871 book "Primitive Culture", in which he defined it as "the general doctrine of souls and other spiritual beings in general". According to Tylor, animism often includes "an idea of pervading life and will in nature;" a belief that natural objects other than humans have souls. This formulation was little different from that proposed by Auguste Comte as "fetishism", but the terms now have distinct meanings.
For Tylor, animism represented the earliest form of religion, being situated within an evolutionary framework of religion that has developed in stages and which will ultimately lead to humanity rejecting religion altogether in favor of scientific rationality. Thus, for Tylor, animism was fundamentally seen as a mistake, a basic error from which all religions grew. He did not believe that animism was inherently illogical, but he suggested that it arose from early humans' dreams and visions and thus was a rational system. However, it was based on erroneous, unscientific observations about the nature of reality. Stringer notes that his reading of "Primitive Culture" led him to believe that Tylor was far more sympathetic in regard to "primitive" populations than many of his contemporaries and that Tylor expressed no belief that there was any difference between the intellectual capabilities of "savage" people and Westerners.
The idea that there had once been "one universal form of primitive religion" (whether labelled "animism", "totemism", or "shamanism") has been dismissed as "unsophisticated" and "erroneous" by archaeologist Timothy Insoll, who stated that "it removes complexity, a precondition of religion now, in "all" its variants."
Social evolutionist conceptions.
Tylor's definition of animism was part of a growing international debate on the nature of "primitive society" by lawyers, theologians, and philologists. The debate defined the field of research of a new science: "anthropology". By the end of the 19th century, an orthodoxy on "primitive society" had emerged, but few anthropologists still would accept that definition. The "19th-century armchair anthropologists" argued that "primitive society" (an evolutionary category) was ordered by kinship and divided into exogamous descent groups related by a series of marriage exchanges. Their religion was animism, the belief that natural species and objects had souls.
With the development of private property, the descent groups were displaced by the emergence of the territorial state. These rituals and beliefs eventually evolved over time into the vast array of "developed" religions. According to Tylor, as society became more scientifically advanced, fewer members of that society would believe in animism. However, any remnant ideologies of souls or spirits, to Tylor, represented "survivals" of the original animism of early humanity.
Confounding animism with totemism.
In 1869 (three years after Tylor proposed his definition of animism), Edinburgh lawyer John Ferguson McLennan, argued that the animistic thinking evident in fetishism gave rise to a religion he named "totemism". Primitive people believed, he argued, that they were descended from the same species as their totemic animal. Subsequent debate by the "armchair anthropologists" (including J. J. Bachofen, Émile Durkheim, and Sigmund Freud) remained focused on totemism rather than animism, with few directly challenging Tylor's definition. Anthropologists "have commonly avoided the issue of animism and even the term itself, rather than revisit this prevalent notion in light of their new and rich ethnographies."
According to anthropologist Tim Ingold, animism shares similarities with totemism but differs in its focus on individual spirit beings which help to perpetuate life, whereas totemism more typically holds that there is a primary source, such as the land itself or the ancestors, who provide the basis to life. Certain indigenous religious groups such as the Aboriginal Australians are more typically totemic in their worldview, whereas others like the Inuit are more typically animistic.
"New animism" definitions.
Many anthropologists ceased using the term "animism", deeming it to be too close to early anthropological theory and religious polemic. However, the term had also been claimed by religious groups—namely, Indigenous communities and nature worshippers—who felt that it aptly described their own beliefs, and who in some cases actively identified as "animists." It was thus readopted by various scholars, who began using the term in a different way, placing the focus on knowing how to behave toward other beings, some of whom are not human. As religious studies scholar Graham Harvey stated, while the "old animist" definition had been problematic, the term "animism" was nevertheless "of considerable value as a critical, academic term for a style of religious and cultural relating to the world."
Hallowell and the Ojibwe.
The "new animism" emerged largely from the publications of anthropologist Irving Hallowell, produced on the basis of his ethnographic research among the Ojibwe communities of Canada in the mid-20th century. For the Ojibwe encountered by Hallowell, "personhood" did not require human-likeness, but rather humans were perceived as being like other persons, who for instance included rock persons and bear persons. For the Ojibwe, these persons were each willful beings, who gained meaning and power through their interactions with others; through respectfully interacting with other persons, they themselves learned to "act as a person".
Hallowell's approach to the understanding of Ojibwe personhood differed strongly from prior anthropological concepts of animism. He emphasized the need to challenge the modernist, Western perspectives of what a person is, by entering into a dialogue with different worldwide views. Hallowell's approach influenced the work of anthropologist Nurit Bird-David, who produced a scholarly article reassessing the idea of animism in 1999. Seven comments from other academics were provided in the journal, debating Bird-David's ideas.
Postmodern anthropology.
More recently, postmodern anthropologists are increasingly engaging with the concept of animism. Modernism is characterized by a Cartesian subject-object dualism that divides the subjective from the objective, and culture from nature. In the modernist view, animism is the inverse of scientism, and hence, is deemed inherently invalid by some anthropologists. Drawing on the work of Bruno Latour, some anthropologists question modernist assumptions and theorize that all societies continue to "animate" the world around them. In contrast to Tylor's reasoning, however, this "animism" is considered to be more than just a remnant of primitive thought. More specifically, the "animism" of modernity is characterized by humanity's "professional subcultures", as in the ability to treat the world as a detached entity within a delimited sphere of activity.
Human beings continue to create personal relationships with elements of the aforementioned objective world, such as pets, cars, or teddy bears, which are recognized as subjects. As such, these entities are "approached as communicative subjects rather than the inert objects perceived by modernists." These approaches aim to avoid the modernist assumption that the environment consists of a physical world distinct from the world of humans, as well as the modernist conception of the person being composed dualistically of a body and a soul.
Nurit Bird-David argues that:
She explains that animism is a "relational epistemology" rather than a failure of primitive reasoning. That is, self-identity among animists is based on their relationships with others, rather than any distinctive features of the "self". Instead of focusing on the essentialized, modernist self (the "individual"), persons are viewed as bundles of social relationships ("dividuals"), some of which include "superpersons" (i.e. non-humans).
Stewart Guthrie expressed criticism of Bird-David's attitude towards animism, believing that it promulgated the view that "the world is in large measure whatever our local imagination makes it." This, he felt, would result in anthropology abandoning "the scientific project."
Like Bird-David, Tim Ingold argues that animists do not see themselves as separate from their environment:
Rane Willerslev extends the argument by noting that animists reject this Cartesian dualism and that the animist self identifies with the world, "feeling at once "within" and "apart" from it so that the two glide ceaselessly in and out of each other in a sealed circuit". The animist hunter is thus aware of himself as a human hunter, but, through mimicry, is able to assume the viewpoint, senses, and sensibilities of his prey, to be one with it. Shamanism, in this view, is an everyday attempt to influence spirits of ancestors and animals, by mirroring their behaviors, as the hunter does its prey.
Ethical and ecological understanding.
Cultural ecologist and philosopher David Abram proposed an ethical and ecological understanding of animism, grounded in the phenomenology of sensory experience. In his books "The Spell of the Sensuous" and "Becoming Animal," Abram suggests that material things are never entirely passive in our direct perceptual experience, holding rather that perceived things actively "solicit our attention" or "call our focus", coaxing the perceiving body into an ongoing participation with those things.
In the absence of intervening technologies, he suggests that sensory experience is inherently animistic in that it discloses a material field that is animate and self-organizing from the beginning. David Abram used contemporary cognitive and natural science, as well as the perspectival worldviews of diverse indigenous oral cultures, to propose a richly pluralist and story-based cosmology in which matter is alive. He suggested that such a relational ontology is in close accord with humanity's spontaneous perceptual experience by drawing attention to the senses, and to the primacy of sensuous terrain, enjoining a more respectful and ethical relation to the more-than-human community of animals, plants, soils, mountains, waters, and weather-patterns that materially sustains humanity.
In contrast to a long-standing tendency in the Western social sciences, which commonly provide rational explanations of animistic experience, Abram develops an animistic account of reason itself. He holds that civilised reason is sustained only by intensely animistic participation between human beings and their own written signs. For instance, as soon as someone reads letters on a page or screen, they can "see what it says"—the letters speak as much as nature spoke to pre-literate peoples. Reading can usefully be understood as an intensely concentrated form of animism, one that effectively eclipses all of the other, older, more spontaneous forms of animistic participation in which humans were once engaged.
Relation to the concept of 'I-thou'.
Religious studies scholar Graham Harvey defined "animism" as the belief "that the world is full of persons, only some of whom are human, and that life is always lived in relationship with others." He added that it is therefore "concerned with learning how to be a good person in respectful relationships with other persons."
In his "Handbook of Contemporary Animism" (2013), Harvey identifies the animist perspective in line with Martin Buber's "I-thou" as opposed to "I-it". In such, Harvey says, the animist takes an I-thou approach to relating to the world, whereby objects and animals are treated as a "thou", rather than as an "it".
Religion.
There is ongoing disagreement (and no general consensus) as to whether animism is merely a singular, broadly encompassing religious belief or a worldview in and of itself, comprising many diverse mythologies found worldwide in many diverse cultures. This also raises a controversy regarding the ethical claims animism may or may not make: whether animism ignores questions of ethics altogether; or, by endowing various non-human elements of nature with spirituality or personhood, it in fact promotes a complex ecological ethics.
Concepts.
Distinction from pantheism.
Animism is not the same as pantheism, although the two are sometimes confused. Moreover, some religions are both pantheistic and animistic. One of the main differences is that while animists believe everything to be spiritual in nature, they do not necessarily see the spiritual nature of everything in existence as being united (monism) the way pantheists do. As a result, animism puts more emphasis on the uniqueness of each individual soul. In pantheism, everything shares the same spiritual essence, rather than having distinct spirits or souls. For example, Giordano Bruno equated the world soul with God and espoused a pantheistic animism.
Fetishism / totemism.
In many animistic world views, the human being is often regarded as on a roughly equal footing with other animals, plants, and natural forces.
African indigenous religions.
Traditional African religions: most religious traditions of Sub-Saharan Africa are basically a complex form of animism with polytheistic and shamanistic elements and ancestor worship.
In West Africa, the Serer religious (A ƭat Roog) encompasses ancestor veneration (not worship) via the Pangool. The Pangool are the Serer ancestral spirits and interceders between the living and the Divine, Roog.
In East Africa the Kerma culture display Animistic elements similar to other Traditional African religions. In contrast to the later polytheistic Napatan and Meroitic periods, the Kerma culture with displays of animals in Amulets and the esteemed antiques of Lions, appear to be an Animistic culture rather than a polytheistic culture. The Kermans likely treated Jebel Barkal as a special sacred site, and passed it on to the Kushites and Egyptians who venerated the mesa.
In North Africa, the traditional Berber religion includes the traditional polytheistic, animist, and in some rare cases, shamanistic, religions of the Berber people.
Asian origin religions.
Indian-origin religions.
In the Indian-origin religions, namely Hinduism, Buddhism, Jainism, and Sikhism, the animistic aspects of nature worship and ecological conservation are part of the core belief system.
Matsya Purana, a Hindu text, has a Sanskrit language shloka (hymn), which explains the importance of reverence of ecology. It states: "A pond equals ten wells, a reservoir equals ten ponds, while a son equals ten reservoirs, and a tree equals ten sons." Indian religions worship trees such as the Bodhi Tree and numerous superlative banyan trees, conserve the sacred groves of India, revere the rivers as sacred, and worship the mountains and their ecology.
Panchavati are the sacred trees in Indic religions, which are sacred groves containing five type of trees, usually chosen from among the Vata ("Ficus benghalensis", Banyan), Ashvattha ("Ficus religiosa", Peepal), Bilva ("Aegle marmelos", Bengal Quince), Amalaki ("Phyllanthus emblica", Indian Gooseberry, Amla), Ashoka ("Saraca asoca", Ashok), Udumbara ("Ficus racemosa", Cluster Fig, Gular), Nimba ("Azadirachta indica", Neem) and Shami ("Prosopis spicigera", Indian Mesquite).
The banyan is considered holy in several religious traditions of India. The "Ficus benghalensis" is the national tree of India. Vat Purnima is a Hindu festival related to the banyan tree, and is observed by married women in North India and in the Western Indian states of Maharashtra, Goa, Gujarat. For three days of the month of Jyeshtha in the Hindu calendar (which falls in May–June in the Gregorian calendar) married women observe a fast, tie threads around a banyan tree, and pray for the well-being of their husbands. Thimmamma Marrimanu, sacred to Indian religions, has branches spread over five acres and was listed as the world's largest banyan tree in the Guinness World Records in 1989.
In Hinduism, the leaf of the banyan tree is said to be the resting place for the god Krishna. In the Bhagavat Gita, Krishna said, "There is a banyan tree which has its roots upward and its branches down, and the Vedic hymns are its leaves. One who knows this tree is the knower of the Vedas." (Bg 15.1)
In Buddhism's Pali canon, the banyan (Pali: "nigrodha") is referenced numerous times. Typical metaphors allude to the banyan's epiphytic nature, likening the banyan's supplanting of a host tree as comparable to the way sensual desire ("kāma") overcomes humans.
Mun (also known as Munism or Bongthingism) is the traditional polytheistic, animist, shamanistic, and syncretic religion of the Lepcha people.
Sanamahism is an ethnic religion of the Meitei people of in Northeast India. It is a polytheistic and animist religion and is named after Lainingthou Sanamahi, one of the most important deities of the Meitei faith.
Chinese religions.
Shendao () is a term originated by Chinese folk religions influenced by, Mohist, Confucian and Taoist philosophy, referring to the divine order of nature or the Wuxing.
The Shang dynasty's state religion was practiced from 1600 BCE to 1046 BCE, and was built on the idea of spiritualizing natural phenomena.
Japan and Shinto.
Shinto is the traditional Japanese folk religion and has many animist aspects. The , a class of supernatural beings, are central to Shinto. All things, including natural forces and well-known geographical locations, are thought to be home to the kami. The kami are worshipped at kamidana household shrines, family shrines, and jinja public shrines.
The Ryukyuan religion of the Ryukyu Islands is distinct from Shinto, but shares similar characteristics.
Kalash people.
Kalash people of Northern Pakistan follow an ancient animistic religion identified with an ancient form of Hinduism.
The Kalash (Kalasha: , romanised: , Devanagari: ), or Kalasha, are an Indo-Aryan indigenous people residing in the Chitral District of the Khyber-Pakhtunkhwa province of Pakistan.
They are considered unique among the people of Pakistan. They are also considered to be Pakistan's smallest ethnoreligious group, and traditionally practice what authors characterise as a form of animism. During the mid-20th century an attempt was made to force a few Kalasha villages in Pakistan to convert to Islam, but the people fought the conversion and, once official pressure was removed, the vast majority resumed the practice of their own religion. Nevertheless, some Kalasha have since converted to Islam, despite being shunned afterward by their community for having done so.
The term is used to refer to many distinct people including the Väi, the Čima-nišei, the Vântä, plus the Ashkun- and Tregami-speakers. The Kalash are considered to be an indigenous people of Asia, with their ancestors migrating to Chitral Valley from another location possibly further south, which the Kalash call "Tsiyam" in their folk songs and epics.
They claim to descend from the armies of Alexander who were left behind from his armed campaign, though no evidence exists for him to have passed the area.
The neighbouring Nuristani people of the adjacent Nuristan (historically known as Kafiristan) province of Afghanistan once had the same culture and practised a faith very similar to that of the Kalash, differing in a few minor particulars.
The first historically recorded Islamic invasions of their lands were by the Ghaznavids in the 11th century while they themselves are first attested in 1339 during Timur's invasions. Nuristan had been forcibly converted to Islam in 1895–96, although some evidence has shown the people continued to practice their customs. The Kalash of Chitral have maintained their own separate cultural traditions.
Korea.
Muism, the native Korean belief, has many animist aspects. The various deities, called "kwisin," are capable of interacting with humans and causing problems if they are not honoured appropriately.
Philippines indigenous religions.
In the indigenous Philippine folk religions, pre-colonial religions of Philippines and Philippine mythology, animism is part of their core beliefs as demonstrated by the belief in Anito, Diwata and Bathala as well as their conservation and veneration of sacred Indigenous Philippine shrines, forests, mountains and sacred grounds.
In ancient Philippine animism, Diwata or Diwatas in plural is a broad, gender-neutral term for supernatural beings, including gods, goddesses, fairies, nature spirits, and celestial entities. Rooted in Hindu-Buddhist influences, the word originally meant "celestial being" or "descent" in Sanskrit word devata (deity). In modern Filipino culture, Diwata is often interpreted and linked to fairies, muses, nymphs, or even dryads.
Anito are the wooden statues and ancestor spirits in the various indigenous shamanistic folk religions of the Philippines, led by female or feminized male shamans known as "babaylan". It includes belief in a spirit world existing alongside and interacting with the material world, as well as the belief that everything has a spirit, from rocks and trees to animals and humans to natural phenomena.
In indigenous Filipino belief, the Bathala is the omnipotent deity which was derived from Sanskrit word for the Hindu supreme deity "bhattara", as one of the ten avatars of the Hindu god Vishnu. The omnipotent Bathala also presides over the spirits of ancestors called Anito. Anitos serve as intermediaries between mortals and the divine, such as Agni (Hindu) who holds the access to divine realms; for this reason they are invoked first and are the first to receive offerings, regardless of the deity the worshipper wants to pray to.
Abrahamic religions.
Animism also has influences in Abrahamic religions.
The Old Testament and the Wisdom literature preach the omnipresence of God (Jeremiah 23:24; Proverbs 15:3; 1 Kings 8:27), and God is bodily present in the incarnation of his Son, Jesus Christ. (Gospel of John 1:14, Colossians 2:9). Animism is not peripheral to Christian identity but is its nurturing home ground, its axis mundi. In addition to the conceptual work the term "animism" performs, it provides insight into the relational character and common personhood of material existence.
The Christian spiritual mapping movement is based upon a similar worldview to that of animism. It involves researching and mapping the spiritual and social history of an area in order to determine the demon (territorial spirit) controlling an area and preventing evangelism, so that the demon can be defeated through spiritual warfare prayer and rituals. Both posit that an invisible spirit world is active and that it can be interacted with or controlled, with the Christian belief that such power to control the spirit world comes from God rather than being inherent to objects or places. "The animist believes that rituals and objects "contain" spiritual power, whereas a Christian believes that rituals and objects may "convey" power. Animists seek to "manipulate" power, whereas Christians seek to "submit" to God and to learn to work with his power."
With rising awareness of ecological preservation, recently theologians like Mark I. Wallace argue for animistic Christianity with a biocentric approach that understands God being present in all earthly objects, such as animals, trees, and rocks.
Pre-Islamic Arab religion.
Pre-Islamic Arab religion can refer to the traditional polytheistic, animist, and in some rare cases, shamanistic, religions of the peoples of the Arabian Peninsula. The belief in jinn, invisible entities akin to spirits in the Western sense dominant in the Arab religious systems, hardly fit the description of Animism in a strict sense. The jinn are considered to be analogous to the human soul by living lives like that of humans, but they are not exactly like human souls neither are they spirits of the dead. It is unclear if belief in jinn derived from nomadic or sedentary populations.
Paganism.
Animism has been identified as a foundational element in the development of many ancient and modern pagan religious traditions. As one of the earliest spiritual worldviews, animism is characterized by the belief that elements of the natural world—including animals, plants, geographical features, and weather systems—possess spirit or agency. Scholars have noted that this perspective influenced the cosmologies of numerous pre-modern societies and contributed to the development of polytheistic and nature-based religious systems that are now categorized as Pagan traditions.
Ancient paganism with animist roots.
In various ancient cultures, such as those of the Celts, Norse, Greeks, Romans, and Slavs, religious beliefs often incorporated elements now associated with animism. Natural features were frequently regarded as sacred or inhabited by spiritual beings. Deities were often linked to specific rivers, trees, mountains, or celestial bodies. According to historian Ronald Hutton, nature in these contexts was not only revered but considered to be "alive and participatory" in religious life.
While these societies developed organized pantheons and mythological systems, many retained a view of the natural world that reflected animistic thought. Practices such as offering rituals at springs, maintaining sacred groves, or acknowledging local land spirits illustrate the integration of animistic concepts within broader polytheistic frameworks.
Continuity in folk religion.
Following the spread of monotheistic religions, especially Christianity, across much of Europe, many animistic and Pagan practices were suppressed or reinterpreted. Nevertheless, aspects of animistic belief persisted through folk religion, particularly in rural communities. Customs such as venerating household spirits, seasonal festivals tied to agricultural cycles, and the personification of natural phenomena continued in modified forms. For example, certain wells and springs that were originally associated with local deities came to be associated with Christian saints, suggesting a degree of continuity between animistic and Christian devotional practices.
These continuities were often preserved through oral traditions, local rituals, and folk customs, contributing to the survival of animistic perspectives beyond their original religious contexts.
Revival and modern pagan movements.
The 19th and 20th centuries saw renewed interest in pre-Christian religions and folklore, influenced by Romanticism, antiquarian studies, and the emergence of national identities. This cultural movement laid the groundwork for contemporary Pagan traditions, such as Wicca, Druidry, and Heathenry, which often draw upon animistic concepts.
Some scholars and practitioners of modern Paganism incorporate animism into their religious frameworks. Graham Harvey has noted that contemporary Pagan worldviews frequently emphasize relationality and agency within the natural world, viewing humans as part of a larger network of sentient beings. In Wiccan and other Pagan rituals, for example, elements such as earth, air, fire, and water are invoked not only symbolically but as active, spiritually significant forces. This approach reflects an animistic orientation toward the environment.
Contemporary interpretations.
In recent decades, animism has been reimagined in both academic and spiritual circles. Rather than viewing it simply as a set of beliefs, many modern interpretations understand animism as a "relational ontology"—a way of being that centers on relationships and mutual respect between humans and non-human entities. This approach presents animism as a legitimate and coherent worldview, one that offers an alternative to Cartesian dualism and materialist perspectives by emphasizing connection over separation.
Emma Restall Orr, a British author and Druidic practitioner, has argued that animism provides a philosophical basis for environmental ethics and personal spirituality within contemporary Paganism. Similarly, Sabina Magliocco has documented the presence of animistic themes in American Neo-Pagan practices, including rituals, festivals, and magical systems.
Contemporary expressions of animism often align with ecological values, highlighting themes like sustainability, interdependence, and a deep respect for the natural world. Within this context, animism is no longer seen as outdated or primitive, but as a meaningful way for people to engage with both their environment and the spiritual forces they perceive within it. The New Age movement, for instance, often incorporates animistic elements, such as beliefs in nature spirits and energetic connections with the Earth.
In recent years, animism has also found a place within emerging spiritual paths. Many neopagan groups—including Eco-pagans—identify as animists, expressing reverence for the web of life and the unseen presences they believe share the world and cosmos with humanity.
Shamanism.
A shaman is a person regarded as having access to, and influence in, the world of benevolent and malevolent spirits, who typically enters into a trance state during a ritual, and practices divination and healing.
According to Mircea Eliade, shamanism encompasses the premise that shamans are intermediaries or messengers between the human world and the spirit worlds. Shamans are said to treat ailments and illnesses by mending the soul. Alleviating traumas affecting the soul or spirit restores the physical body of the individual to balance and wholeness. The shaman also enters supernatural realms or dimensions to obtain solutions to problems afflicting the community. Shamans may visit other worlds or dimensions to bring guidance to misguided souls and to ameliorate illnesses of the human soul caused by foreign elements. The shaman operates primarily within the spiritual world, which in turn affects the human world. The restoration of balance results in the elimination of the ailment.
Abram, however, articulates a less supernatural and much more ecological understanding of the shaman's role than that propounded by Eliade. Drawing upon his own field research in Indonesia, Nepal, and the Americas, Abram suggests that in animistic cultures, the shaman functions primarily as an intermediary between the human community and the more-than-human community of active agencies—the local animals, plants, and landforms (mountains, rivers, forests, winds, and weather patterns, all of which are felt to have their own specific sentience). Hence, the shaman's ability to heal individual instances of disease (or imbalance) within the human community is a byproduct of their more continual practice of balancing the reciprocity between the human community and the wider collective of animate beings in which that community is embedded.
Animist life.
Non-human animals.
Animism entails the belief that all living things have a soul, and thus, a central concern of animist thought surrounds how animals can be eaten, or otherwise used for humans' subsistence needs. The actions of non-human animals are viewed as "intentional, planned and purposive", and they are understood to be persons, as they are both alive, and communicate with others.
In animist worldviews, non-human animals are understood to participate in kinship systems and ceremonies with humans, as well as having their own kinship systems and ceremonies. Graham Harvey cited an example of an animist understanding of animal behavior that occurred at a powwow held by the Conne River Mi'kmaq in 1996; an eagle flew over the proceedings, circling over the central drum group. The assembled participants called out ('eagle'), conveying welcome to the bird and expressing pleasure at its beauty, and they later articulated the view that the eagle's actions reflected its approval of the event, and the Mi'kmaq's return to traditional spiritual practices.
In animism, rituals are performed to maintain relationships between humans and spirits. Indigenous peoples often perform these rituals to appease the spirits and request their assistance during activities such as hunting and healing. In the Arctic region, certain rituals are common before the hunt as a means to show respect for the spirits of animals.
Flora.
Some animists also view plant and fungi life as persons and interact with them accordingly. The most common encounter between humans and these plant and fungi persons is with the former's collection of the latter for food, and for animists, this interaction typically has to be carried out respectfully. Harvey cited the example of Māori communities in New Zealand, who often offer "karakia" invocations to sweet potatoes as they dig up the latter. While doing so, there is an awareness of a kinship relationship between the Māori and the sweet potatoes, with both understood as having arrived in Aotearoa together in the same canoes.
In other instances, animists believe that interaction with plant and fungi persons can result in the communication of things unknown or even otherwise unknowable. Among some modern Pagans, for instance, relationships are cultivated with specific trees, who are understood to bestow knowledge or physical gifts, such as flowers, sap, or wood that can be used as firewood or to fashion into a wand; in return, these Pagans give offerings to the tree itself, which can come in the form of libations of mead or ale, a drop of blood from a finger, or a strand of wool.
The elements.
Various animistic cultures also comprehend stones as persons. Discussing ethnographic work conducted among the Ojibwe, Harvey noted that their society generally conceived of stones as being inanimate, but with two notable exceptions: the stones of the Bell Rocks and those stones which are situated beneath trees struck by lightning, which were understood to have become Thunderers themselves. The Ojibwe conceived of weather as being capable of having personhood, with storms being conceived of as persons known as 'Thunderers' whose sounds conveyed communications and who engaged in seasonal conflict over the lakes and forests, throwing lightning at lake monsters. Wind, similarly, can be conceived as a person in animistic thought.
The importance of place is also a recurring element of animism, with some places being understood to be persons in their own right.
Spirits.
Animism can also entail relationships being established with non-corporeal spirit entities.
Other usage.
Psychology.
From his studies into child development, Jean Piaget suggested that children were born with an innate animist worldview in which they anthropomorphized inanimate objects and that it was only later that they grew out of this belief. Conversely, from her ethnographic research, Margaret Mead argued the opposite, believing that children were not born with an animist worldview but that they became acculturated to such beliefs as they were educated by their society.
Stewart Guthrie saw animism—or "attribution" as he preferred it—as an evolutionary strategy to aid survival. He argued that both humans and other animal species view inanimate objects as potentially alive as a means of being constantly on guard against potential threats. His suggested explanation, however, did not deal with the question of why such a belief became central to the religion. In 2000, Guthrie suggested that the "most widespread" concept of animism was that it was the "attribution of spirits to natural phenomena such as stones and trees."
Attempts to reconcile with science.
In the early 20th century, William McDougall defended a form of animism in his book "Body and Mind: A History and Defence of Animism" (1911).
Physicist Nick Herbert has argued for "quantum animism" in which the mind permeates the world at every level:
Werner Krieglstein wrote regarding his "quantum Animism":
In "Error and Loss: A Licence to Enchantment", Ashley Curtis (2018) has argued that the Cartesian idea of an experiencing subject facing off with an inert physical world is incoherent at its very foundation and that this incoherence is consistent with rather than belied by Darwinism. Human reason (and its rigorous extension in the natural sciences) fits an evolutionary niche just as echolocation does for bats and infrared vision does for pit vipers, and is epistemologically on a par with, rather than superior to, such capabilities. The meaning or aliveness of the "objects" we encounter, rocks, trees, rivers, and other animals, thus depends for its validity not on a detached cognitive judgment, but purely on the quality of our experience. The animist experience, or the wolf's or raven's experience, thus become licensed as equally valid worldviews to the modern western scientific one; they are indeed more valid, since they are not plagued with the incoherence that inevitably arises when "objective existence" is separated from "subjective experience."
Socio-political impact.
Harvey opined that animism's views on personhood represented a radical challenge to the dominant perspectives of modernity, because it accords "intelligence, rationality, consciousness, volition, agency, intentionality, language, and desire" to non-humans. Similarly, it challenges the view of human uniqueness that is prevalent in both Abrahamic religions and Western rationalism.
Art and literature.
Animist beliefs can also be expressed through artwork. For instance, among the Māori communities of New Zealand, there is an acknowledgement that creating art through carving wood or stone entails violence against the wood or stone person and that the persons who are damaged therefore have to be placated and respected during the process; any excess or waste from the creation of the artwork is returned to the land, while the artwork itself is treated with particular respect. Harvey, therefore, argued that the creation of art among the Māori was not about creating an inanimate object for display, but rather a transformation of different persons within a relationship.
Harvey expressed the view that animist worldviews were present in various works of literature, citing such examples as the writings of Alan Garner, Leslie Silko, Barbara Kingsolver, Alice Walker, Daniel Quinn, Linda Hogan, David Abram, Patricia Grace, Chinua Achebe, Ursula Le Guin, Louise Erdrich, and Marge Piercy.
Animist worldviews have also been identified in the animated films of Hayao Miyazaki.
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Antonio Vivaldi
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Antonio Lucio Vivaldi (4 March 1678 – 28 July 1741) was an Italian composer, musician, poet, virtuoso violinist, impresario of Baroque music and Roman Catholic priest. Regarded as one of the greatest Baroque composers, Vivaldi's influence during his lifetime was widespread across Europe, giving origin to many imitators and admirers. He pioneered many developments in orchestration, violin technique and programmatic music. He consolidated the emerging concerto form, especially the solo concerto, into a widely accepted and followed idiom.
Vivaldi composed many instrumental concertos, for the violin and a variety of other musical instruments, as well as sacred choral works and more than fifty operas. His best-known work is a series of violin concertos known as "The Four Seasons". Many of his compositions were written for the all-female music ensemble of the , a home for abandoned children in his native Venice. Vivaldi began studying for the Catholic priesthood at the age of 15 and was ordained at 25, but was given dispensation to no longer say public Masses due to a health problem. Vivaldi also had some success with expensive stagings of his operas in Venice, Mantua and Vienna. After meeting the Emperor Charles VI, Vivaldi moved to Vienna, hoping for royal support. However, the Emperor died soon after Vivaldi's arrival, and Vivaldi himself died in poverty less than a year later.
After almost two centuries of decline, Vivaldi's musical reputation underwent a revival in the early 20th century, with much scholarly research devoted to his work. Many of Vivaldi's compositions, once thought lost, have been rediscovered – some as recently as 2015. His music remains widely popular in the present day and is regularly played all over the world.
Early life.
Birth and background.
Antonio Lucio Vivaldi was born on 4 March 1678 in Venice, then the capital of the Republic of Venice. He was the son of Giovanni Battista Vivaldi and Camilla Calicchio, as recorded in the register of San Giovanni in Bragora.
He was baptized immediately after his birth at his home by the midwife, the reason for which has led to speculation. It was most likely done due to his poor health. There is a false rumor that an earthquake struck the city that day. This rumor may have originated from an earthquake that struck Venice on 17 April 1688. The baptismal ceremonies which had been omitted were supplied two months later.
Vivaldi had five known siblings: Bonaventura Tomaso, Margarita Gabriela, Cecilia Maria, Francesco Gaetano, and Zanetta Anna. Vivaldi's health was problematic. One of his symptoms, ("tightness of the chest"), has been interpreted as a form of asthma. This did not prevent him from learning to play the violin, composing, or taking part in musical activities, although it prevented him from playing wind instruments.
Youth.
His father, Giovanni Battista, was a barber before becoming a professional violinist and was one of the founders of the , an association of musicians. He taught Antonio to play the violin and then toured Venice, playing the violin with his young son. Antonio was probably taught at an early age, judging by the extensive musical knowledge he had acquired by the age of 24, when he started working at the (Devout Hospital of Mercy), an orphanage in Venice.
The president of the was Giovanni Legrenzi, an early Baroque composer and the at St Mark's Basilica. It is possible that Legrenzi gave the young Antonio his first lessons in composition. Vivaldi's father may have been a composer himself: in 1689, an opera titled was composed by a Giovanni Battista Rossi—the name under which Vivaldi's father had joined the Sovvegno di Santa Cecilia.
In 1693, at the age of fifteen, he began studying to become a priest. He was ordained in 1703, aged 25, and was soon nicknamed , "The Red Priest"; is Italian for "red" and would have referred to the color of his hair, a family trait.
Career.
Ospedale della Pietà.
Although Vivaldi is most famous as a composer, he was regarded as an exceptional technical violinist as well. The German architect Johann Friedrich Armand von Uffenbach referred to Vivaldi as "the famous composer and violinist" and noted in his diary that "Vivaldi played a solo accompaniment excellently, and at the conclusion he added a free fantasy [an improvised cadenza] which absolutely astounded me, for it is hardly possible that anyone has ever played, or ever will play, in such a fashion." In September 1703, Vivaldi (24) became (master of violin) at the ; although his talents as a violinist probably secured him the job, he soon became a successful teacher of music there.
Over the next thirty years he composed most of his major works while working at the Ospedale. There were four similar institutions in Venice; their purpose was to give shelter and education to children who were abandoned or orphaned, or whose families could not support them. They were financed by funds provided by the Republic. The boys learned a trade and had to leave when they reached the age of fifteen. The girls received a musical education, and the most talented among them stayed and became members of the Ospedale's renowned orchestra and choir.
Shortly after Vivaldi's appointment, the orphans began to gain appreciation and esteem abroad, too. Vivaldi wrote concertos, cantatas and sacred vocal music for them. These sacred works, which number over 60, are varied: they included solo motets and large-scale choral works for soloists, double chorus, and orchestra. In 1704, the position of teacher of "viola all'inglese" was added to his duties as violin instructor. The position of "maestro di coro", which was at one time filled by Vivaldi, required a lot of time and work. He had to compose an oratorio or concerto for every feast and teach the orphans both music theory and how to play certain instruments.
His relationship with the board of directors of the Ospedale was often strained. The board had to vote every year on whether to keep a teacher. The vote on Vivaldi was seldom unanimous and went 7 to 6 against him in 1709. In 1711, after a year as a freelance musician, he was recalled by the Ospedale with a unanimous vote; clearly during his year's absence the board had realized the importance of his role. He became responsible for all of the musical activity of the institution when he was promoted to "maestro de' concerti" (music director) in 1716 and responsible for composing two new concertos every month.
In 1705, the first collection of his works was published by Giuseppe Sala. His Opus 1 is a collection of 12 sonatas for two violins and basso continuo, in a conventional style. In 1709, a second collection of 12 sonatas for violin and basso continuo appeared (Opus 2). A real breakthrough as a composer came with his first collection of 12 concerti for one, two, and four violins with strings, "L'estro armonico" (Opus 3), which was published in Amsterdam in 1711 by Estienne Roger, and dedicated to Grand Prince Ferdinand of Tuscany. The prince sponsored many musicians, including Alessandro Scarlatti and George Frideric Handel. He was a musician himself, and Vivaldi probably met him in Venice. "L'estro armonico" was a resounding success all over Europe. It was followed in 1714 by "La stravaganza" (Opus 4), a collection of concerti for solo violin and strings, and dedicated to an old violin student of Vivaldi's, the Venetian noble Vettor Dolfin.
In February 1711, Vivaldi and his father traveled to Brescia, where his setting of the Stabat Mater (RV 621) was played as part of a religious festival. The work seems to have been written in haste: the string parts are simple, the music of the first three movements is repeated in the next three, and not all the text is set. Nevertheless, perhaps in part because of the forced essentiality of the music, the work is considered to be one of his early masterpieces.
Despite his frequent travels from 1718, the Ospedale paid him 2 sequins to write two concerti a month for the orchestra and to rehearse with them at least five times when in Venice. The orphanage's records show that he was paid for 140 concerti between 1723 and 1733.
Opera impresario.
In early 18th-century Venice, opera was the most popular musical entertainment. It proved most profitable for Vivaldi. There were several theaters competing for the public's attention. Vivaldi started his career as an opera composer as a sideline: his first opera, "Ottone in villa" (RV 729) was performed not in Venice, but at the Garzerie Theater in Vicenza in 1713. The following year, Vivaldi became the impresario of the Teatro San Angelo in Venice, where his opera "Orlando finto pazzo" (RV 727) was performed. The work was not to the public's taste, and it closed after a couple of weeks, being replaced with a repeat of a different work already given the previous year.
In 1715, he presented "Nerone fatto Cesare" (RV 724, now lost), with music by seven different composers, of which he was the leader. The opera contained eleven arias and was a success. In the late season, Vivaldi planned to put on an opera entirely of his own creation, "Arsilda, regina di Ponto" (RV 700), but the state censor blocked the performance. The main character, Arsilda, falls in love with another woman, Lisea, who is pretending to be a man. Vivaldi got the censor to accept the opera the following year, and it was a resounding success.
During this period, the "Pietà" commissioned several liturgical works. The most important were two oratorios. "Moyses Deus Pharaonis", (RV 643) is now lost. The second, "Juditha triumphans" (RV 644), celebrates the victory of the Republic of Venice against the Turks and the recapture of the island of Corfu. Composed in 1716, it is one of his sacred masterpieces. All eleven singing parts were performed by girls of the orphanage, both the female and male roles. Many of the arias include parts for solo instruments—recorders, oboes, violas d'amore, and mandolins—that showcased the range of talents of the girls.
Also in 1716, Vivaldi wrote and produced two more operas, "L'incoronazione di Dario" (RV 719) and "La costanza trionfante degli amori e degli odi" (RV 706). The latter was so popular that it was performed two years later, re-edited and retitled "Artabano re dei Parti" (RV 701, now lost). It was also performed in Prague in 1732. In the years that followed, Vivaldi wrote several operas that were performed all over Italy.
His progressive operatic style caused him some trouble with more conservative musicians such as Benedetto Marcello, a magistrate and amateur musician who wrote a pamphlet denouncing Vivaldi and his operas. The pamphlet, "Il teatro alla moda", attacks the composer even though it does not mention him directly. The cover drawing shows a boat (the San Angelo), on the left end of which stands a little angel wearing a priest's hat and playing the violin. The Marcello family claimed ownership of the Teatro San Angelo, and a long legal battle had been fought with the management for its restitution, without success. The obscure text under the engraving mentions non-existent places and names: for example, "ALDIVIVA" is an anagram of "A. Vivaldi".
In a letter written by Vivaldi to his patron Marchese Bentivoglio in 1737, he makes reference to his "94 operas". Only about 50 operas by Vivaldi have been discovered, and no other documentation of the remaining operas exists. Although Vivaldi could have been exaggerating, it is plausible that, in his dual role of composer and "impresario", he might have either written or been responsible for the production of as many as 94 operas—given that his career had by then spanned almost 25 years. Although Vivaldi certainly composed many operas in his time, he never attained the prominence of other great composers such as Alessandro Scarlatti, Johann Adolph Hasse, Leonardo Leo, and Baldassare Galuppi, as evidenced by his inability to keep a production running for an extended period of time in any major opera house.
Mantua and the" Four Seasons".
In 1717 or 1718, Vivaldi was offered a prestigious new position as "Maestro di Cappella" of the court of Prince Philip of Hesse-Darmstadt, governor of Mantua, in the northwest of Italy He moved there for three years and produced several operas, among them "Tito Manlio" (RV 738). In 1721, he was in Milan, where he presented the pastoral drama "La Silvia" (RV 734); nine arias from it survive. He visited Milan again the following year with the oratorio "L'adorazione delli tre re magi al bambino Gesù" (RV 645, now lost). In 1722 he moved to Rome, where he introduced his operas' new style. The new Pope Benedict XIII invited Vivaldi to play for him. In 1725, Vivaldi returned to Venice, where he produced four operas in the same year.
During this period, Vivaldi wrote the "Four Seasons", four violin concertos that give musical expression to the seasons of the year. The composition is probably one of his most famous. Although three of the concerti are wholly original, the first, "Spring", borrows motifs from a Sinfonia in the first act of Vivaldi's contemporaneous opera "Il Giustino". The inspiration for the concertos was probably the countryside around Mantua. They were a revolution in musical conception: in them, Vivaldi represented flowing streams, singing birds (of different species, each specifically characterized), barking dogs, buzzing mosquitoes, crying shepherds, storms, drunken dancers, silent nights, hunting parties from both the hunters' and the prey's point of view, frozen landscapes, ice-skating children, and warming winter fires. Each concerto is associated with a sonnet, possibly by Vivaldi, describing the scenes depicted in the music. They were published as the first four concertos in a collection of twelve, "Il cimento dell'armonia e dell'inventione", Opus 8, published in Amsterdam by Michel-Charles Le Cène in 1725.
During his time in Mantua, Vivaldi became acquainted with an aspiring young singer Anna Tessieri Girò, who would become his student, protégée, and favorite "prima donna". Anna, along with her older half-sister Paolina, moved in with Vivaldi and regularly accompanied him on his many travels. There was speculation as to the nature of Vivaldi's and Girò's relationship, but no evidence exists to indicate anything beyond friendship and professional collaboration. Vivaldi, in fact, adamantly denied any romantic relationship with Girò in a letter to his patron Bentivoglio, dated 16 November 1737.
Late period.
Vivaldi collaborated with choreographer Giovanni Gallo on several of his later operas stage in Venice with Gallo choreographing the ballets found within those works. At the height of his career, he received commissions from European nobility and royalty, some of which were:
Like many composers of the time, Vivaldi faced financial difficulties in his later years. His compositions were no longer held in such high esteem as they had once been in Venice; changing musical tastes quickly made them outmoded. In response, Vivaldi chose to sell off sizeable numbers of his manuscripts at paltry prices to finance his migration to Vienna. The reasons for Vivaldi's departure from Venice are unclear, but it seems likely that, after the success of his meeting with Emperor Charles VI, he wished to take up the position of a composer in the imperial court. On his way to Vienna, Vivaldi might have stopped in Graz to see Anna Girò.
Death.
Vivaldi probably moved to Vienna to stage operas, especially as he took up residence near the Kärntnertortheater. Shortly after his arrival in Vienna, Charles VI died, which left the composer without any imperial patronage or a steady source of income. Soon afterwards, Vivaldi became impoverished and, during the night of 27/28 July 1741, aged 63, he died of "internal infection", in a house owned by the widow of a Viennese saddlemaker.
On 28 July, Vivaldi's funeral took place at St. Stephen's Cathedral. Contrary to popular legend, the young Joseph Haydn who was in the cathedral choir at the time had nothing to do with his burial, since no music was performed on that occasion. The funeral was attended by six pall-bearers and six choir boys ("Kuttenbuben"), at a "mean" cost of 19 florins and 45 kreuzer. Only a "Kleingeläut" (small peal of bells), the lowest class, was provided, at a cost of 2 florins and 36 kreuzer.
Vivaldi was buried in a simple grave in a burial ground that was owned by the public hospital fund – the Bürgerspital-Gottesacker cemetery, next to St Charles Church, a baroque church in an area that is now part of the site of the TU Wien university. The cemetery existed until 1807. The house where he lived in Vienna has since been destroyed; the Hotel Sacher is built on part of the site. Memorial plaques have been placed at both locations, as well as a Vivaldi "star" in the Viennese Musikmeile and a monument at the Rooseveltplatz.
Only two, possibly three, original portraits of Vivaldi are known to survive: an engraving, an ink sketch and an oil painting. The engraving, which was the basis of several copies produced later by other artists, was made in 1725 by François Morellon de La Cave for the first edition of "Il cimento dell'armonia e dell'inventione", and shows Vivaldi holding a sheet of music. The ink sketch, a caricature, was done by Ghezzi in 1723 and shows Vivaldi's head and shoulders in profile. It exists in two versions: a first jotting kept at the Vatican Library, and a much lesser-known, slightly more detailed copy recently discovered in Moscow. The oil painting, which can be seen in the International Museum and Library of Music of Bologna, is by an anonymous artist and is thought to depict Vivaldi due to its strong resemblance to the La Cave engraving.
During his lifetime, Vivaldi was popular in many countries throughout Europe, including France, but after his death his popularity dwindled. After the end of the Baroque period, Vivaldi's published concerti became relatively unknown, and were largely ignored. Even his most famous work, "The Four Seasons", was unknown in its original edition during the Classical and Romantic periods. Vivaldi's work was rediscovered in the 20th century.
Works.
A composition by Vivaldi is identified by RV number, which refers to its place in the "Ryom-Verzeichnis" or "Répertoire des oeuvres d'Antonio Vivaldi", a catalog created in the 20th century by the musicologist Peter Ryom.
"Le quattro stagioni" (The Four Seasons) of 1723 is his most famous work. The first four of the 12 concertos, titled "Il cimento dell'armonia e dell'inventione" ("The Contest between Harmony and Invention"), they depict moods and scenes from each of the four seasons. This work has been described as an outstanding example of pre-19th-century program music. Vivaldi's other notable sets of 12 violin concertos include "La stravaganza" (The Eccentricity), "L'estro armonico" (The Harmonic Inspiration) and "La cetra" (The Lyre).
Vivaldi wrote more than 500 concertos. About 350 of these are for solo instrument and strings, of which 230 are for violin; the others are for bassoon, cello, oboe, flute, viola d'amore, recorder, lute, or mandolin. About forty concertos are for two instruments and strings, and about thirty are for three or more instruments and strings.
As well as about 46 operas, Vivaldi composed a large body of sacred choral music, such as the Gloria, RV 589; Nisi Dominus, RV 608; Magnificat, RV 610 and Stabat Mater, RV 621. Gloria, RV 589 remains one of Vivaldi's more popular sacred works. Other works include sinfonias, about 90 sonatas and chamber music.
Some sonatas for flute, published as "Il Pastor Fido", have been erroneously attributed to Vivaldi, but were composed by Nicolas Chédeville.
Catalogues of Vivaldi works.
Vivaldi's works attracted cataloging efforts befitting a major composer. Scholarly work intended to increase the accuracy and variety of Vivaldi performances also supported new discoveries that made old catalogs incomplete. Works still in circulation today might be numbered under several different systems (some earlier catalogs are mentioned here).
Because the simply consecutive Complete Edition (CE) numbers did not reflect the individual works (Opus numbers) into which compositions were grouped, numbers assigned by Antonio Fanna were often used in conjunction with CE numbers. Combined Complete Edition (CE)/Fanna numbering was especially common in the work of Italian groups driving the mid-20th-century revival of Vivaldi, such as Gli Accademici di Milano under Piero Santi. For example, the Bassoon Concerto in B major, "La Notte", RV 501, became CE 12, F. VIII,1
Despite the awkwardness of having to overlay Fanna numbers onto the Complete Edition number for meaningful grouping of Vivaldi's oeuvre, these numbers displaced the older Pincherle numbers as the (re-) discovery of more manuscripts had rendered older catalogs obsolete.
This cataloging work was led by the Istituto Italiano Antonio Vivaldi, where Gian Francesco Malipiero was both the director and the editor of the published scores (Edizioni G. Ricordi). His work built on that of Antonio Fanna, a Venetian businessman and the institute's founder, and thus formed a bridge to the scholarly catalog dominant today.
Compositions by Vivaldi are identified today by RV number, the number assigned by Danish musicologist Peter Ryom in works published mostly in the 1970s, such as the "Ryom-Verzeichnis" or "Répertoire des oeuvres d'Antonio Vivaldi". Like the Complete Edition before it, the RV does not typically assign its single, consecutive numbers to "adjacent" works that occupy one of the composer's single opus numbers. Its goal as a modern catalog is to index the manuscripts and sources that establish the existence and nature of all known works.
Style and influence.
The German scholar Walter Kolneder has discerned the influence of Legrenzi's style in Vivaldi's early liturgical work "Laetatus sum" (RV Anh 31), written in 1691 at the age of thirteen.
Vivaldi was also influenced by the Composer Arcangelo Corelli.
Johann Sebastian Bach was deeply influenced by Vivaldi's concertos and arias (recalled in his "St John Passion", "St Matthew Passion", and cantatas). Bach transcribed six of Vivaldi's concerti for solo keyboard, a further three for organ, and one for four harpsichords, strings, and basso continuo (BWV 1065) based upon the concerto for four violins, two violas, cello, and basso continuo (RV 580).
Legacy.
In the early 20th century, Fritz Kreisler's Concerto in C, in the Style of Vivaldi (which he passed off as an original Vivaldi work) helped revive Vivaldi's reputation. Kreisler's concerto in C spurred the French scholar Marc Pincherle to begin an academic study of Vivaldi's oeuvre. Many Vivaldi manuscripts were rediscovered, and were acquired by the Turin National University Library as a result of the generous sponsorship of Turinese businessmen Roberto Foa and Filippo Giordano, in memory of their sons. This led to a renewed interest in Vivaldi by, among others, Mario Rinaldi, Alfredo Casella, Ezra Pound, Olga Rudge, Desmond Chute, Arturo Toscanini, Arnold Schering and Louis Kaufman, all of whom were instrumental in the revival of Vivaldi throughout the 20th century.
In 1926, in a monastery in Piedmont, researchers discovered fourteen bound volumes of Vivaldi's work (later discovered to be fifteen) that were previously thought to have been lost during the Napoleonic Wars. Some missing tomes in the numbered set were discovered in the collections of the descendants of the Grand Duke Durazzo, who had acquired the monastery complex in the 18th century. The volumes contained 300 concertos, 19 operas and over 100 vocal-instrumental works.
The resurrection of Vivaldi's unpublished works in the 20th century greatly benefited from the noted efforts of Alfredo Casella, who in 1939 organized the historic Vivaldi Week, in which the rediscovered Gloria (RV 589) and l'Olimpiade were revived. Since World War II, Vivaldi's compositions have enjoyed wide success. Historically informed performances, often on "original instruments", have increased Vivaldi's fame still further.
Recent rediscoveries of works by Vivaldi include two psalm settings: Psalm 127, "Nisi Dominus" RV 803 (in eight movements); and Psalm 110, "Dixit Dominus" RV 807 (in eleven movements). These were identified in 2003 and 2005, respectively, by the Australian scholar Janice Stockigt. The Vivaldi scholar Michael Talbot described RV 807 as "arguably the best nonoperatic work from Vivaldi's pen to come to light since ... the 1920s".
In February 2002, musicologist discovered 70% of the music for the opera Motezuma (RV 723) in the Sing-Akademie zu Berlin archives. Long thought lost, it was described by Dutch musicologist as "the most important Vivaldi discovery in 75 years." One of the earliest operas to have been set in the Americas, versions of it were staged in Düsseldorf in 2005 and Long Beach in 2009.
Vivaldi's 1730 opera, "Argippo" (RV 697), which had also been considered lost, was rediscovered in 2006 by the harpsichordist and conductor Ondřej Macek, whose Hofmusici orchestra performed the work at Prague Castle on 3 May 2008—its first performance since 1730.
Modern depictions of Vivaldi's life include a 2005 radio play, commissioned by ABC Radio National and written by Sean Riley. Entitled "The Angel and the Red Priest", the play was later adapted for the stage and performed at the Adelaide Festival of the Arts. Films about Vivaldi include: ' (1989), an Italian-French co-production under the direction of Étienne Périer; ' (2006), an Italian-French co-production under the direction of ; and "Vivaldi, the Red Priest" (2009), an Italian film created and directed by Liana Marabini, and loosely based on Vivaldi's life as both priest and composer.
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Adrian
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Adrian is a form of the Latin given name Adrianus or Hadrianus. Its ultimate origin is most likely via the former river Adria from the Venetic and Illyrian word "adur", meaning "sea" or "water".
The Adria was until the 8th century BC the main channel of the Po River into the Adriatic Sea but ceased to exist before the 1st century BC. Hecataeus of Miletus (c.550 – c.476 BC) asserted that both the Etruscan harbor city of Adria and the Adriatic Sea had been named after it. Emperor Hadrian's family was named after the city or region of Adria/Hadria, now Atri, in Picenum, which most likely started as an Etruscan or Greek colony of the older harbor city of the same name.
Several saints and six popes have borne this name, including the only English pope, Adrian IV, and the only Dutch pope, Adrian VI. As an English name, it has been in use since the Middle Ages.
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1433
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21476752
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https://en.wikipedia.org/wiki?curid=1433
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Aare
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The Aare () or Aar () is the main tributary of the High Rhine (its discharge even exceeds that of the latter at their confluence) and the longest river that both rises and ends entirely within Switzerland.
Its total length from its source to its junction with the Rhine comprises about , during which distance it descends , draining an area of , almost entirely within Switzerland, and accounting for close to half the area of the country, including all of Central Switzerland.
There are more than 40 hydroelectric plants along the course of the Aare.
The river's name dates to at least the La Tène period, and it is attested as "Nantaror" "Aare valley" in the Berne zinc tablet.
The name was Latinized as "Arula"/"Arola"/"Araris".
Course.
The Aare rises in the great Aargletschers (Aare Glaciers) of the Bernese Alps, in the canton of Bern and west of the Grimsel Pass. The Finsteraargletscher and Lauteraargletscher come together to form the Unteraargletscher (Lower Aar Glacier), which is the main source of water for the Grimselsee (Lake of Grimsel). The Oberaargletscher (Upper Aar Glacier) feeds the Oberaarsee, which also flows into the Grimselsee. The Aare leaves the Grimselsee just to the east to the Grimsel Hospiz, below the Grimsel Pass, and then flows northwest through the Haslital, forming on the way the magnificent Handegg Waterfall, , past Guttannen.
Right after Innertkirchen it is joined by its first major tributary, the Gamderwasser. Less than later the river carves through a limestone ridge in the Aare Gorge (). It is here that the Aare proves itself to be more than just a river, as it attracts thousands of tourists annually to the causeways through the gorge. A little past Meiringen, near Brienz, the river expands into Lake Brienz. Near the west end of the lake it indirectly receives its first important tributary, the Lütschine, by the Lake of Brienz. It then runs across the swampy plain of the Bödeli (Swiss German diminutive for ground) between Interlaken and Unterseen before flowing into Lake Thun.
Near the west end of Lake Thun, the river indirectly receives the waters of the Kander, which has just been joined by the Simme, by the Lake of Thun. Lake Thun marks the head of navigation. On flowing out of the lake it passes through Thun, and then flows through the city of Bern, passing beneath eighteen bridges and around the steeply-flanked peninsula on which the Old City is located. To the south of the Old City peninsula is the , a weir which provides water for the small Matte hydroelectric power plant. River swimming in the Aare is popular in Bern, and the river is sometimes full of bathers on summer days. The river soon changes its northwesterly flow for a due westerly direction, but after receiving the Saane or La Sarine it turns north until it nears Aarberg. There, in one of the major Swiss engineering feats of the 19th century, the Jura water correction, the river, which had previously rendered the countryside north of Bern a swampland through frequent flooding, was diverted by the Aare-Hagneck Canal into the Lac de Bienne. From the upper end of the lake, at Nidau, the river issues through the Nidau-Büren Canal, also called the Aare Canal, and then runs east to Büren. The lake absorbs huge amounts of eroded gravel and snowmelt that the river brings from the Alps, and the former swamps have become fruitful plains: they are known as the "vegetable garden of Switzerland".
From here the Aare flows northeast for a long distance, past the ambassador town Solothurn (below which the Grosse Emme flows in on the right), Aarburg (where it is joined by the Wigger), Olten, Aarau, near which is the junction with the Suhre, and Wildegg, where the Seetal Aabach falls in on the right. A short distance further, below Brugg, it receives first the Reuss, its major tributary, and shortly afterwards the Limmat, its second strongest tributary. It now turns due north, and soon becomes itself a tributary of the Rhine, which it even surpasses in volume when the two rivers unite downstream from Koblenz (Switzerland), opposite Waldshut in Germany. The Rhine, in turn, empties into the North Sea after crossing into the Netherlands.
Incidents.
On May 26, 2022, Indonesia West Java Governor Ridwan Kamil's eldest child, Emmeril Kahn Mumtadz, was declared missing after being swept away by the river current. Chronologically, Eril was swimming in the river with his sister and friends. When he wanted to rise to the surface, Eril was dragged by a fairly swift current of the river which had previously received help from his friend. The search efforts involving the police search and rescue team, maritime police, fire department, and authority of the city of Bern. One week after declared missing, Emmeril Kahn Mumtadz was declared dead "in absentia" at the age of 22. Although on June 9, 2022, Eril's body was located. The funeral procession of Emmeril “Eril” Kahn Mumtadz took place in the family's burial ground located in Cimaung, Bandung regency, West Java. Soon after news about Eril's body brought back to his home, Indonesian netizens review bombed Aare River's Google listing, leaving negative comments and one-star ratings as if the waterway was fully to blame for the tragedy.
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1435
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8372814
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https://en.wikipedia.org/wiki?curid=1435
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Abbotsford, Scottish Borders
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Abbotsford is a historic country house in the Scottish Borders, near Galashiels, on the south bank of the River Tweed. Now open to the public, it was built as the residence of historical novelist and poet Sir Walter Scott between 1817 and 1825. It is a Category A Listed Building and the estate is listed in the Inventory of Gardens and Designed Landscapes in Scotland.
Description.
The nucleus of the estate was a farm of , called Cartleyhole, nicknamed Clarty (i.e., muddy) Hole, and was bought by Scott on the lapse of his lease (1811) of the neighbouring house of Ashestiel. Scott renamed it "Abbotsford" after a neighbouring ford used by the monks of Melrose Abbey.
Following a modest enlargement of the original farmhouse in 1811–1812, massive expansions took place in 1816–1819 and 1822–1824. In this mansion Scott gathered a large library, a collection of ancient furniture, arms and armour, and other relics and curiosities especially connected with Scottish history, notably the Celtic Torrs Pony-cap and Horns and the Woodwrae Stone, all now in the Museum of Scotland. Scott described the resulting building as "a sort of romance in Architecture" and "a kind of Conundrum Castle to be sure".
The last and principal acquisition was that of Toftfield (afterwards named Huntlyburn), purchased in 1817. The new house was then begun and completed in 1824.
The general ground-plan is a parallelogram, with irregular outlines, one side overlooking the Tweed; and the style is mainly the Scottish Baronial. With his architects William Atkinson and Edward Blore Scott was a pioneer of the Scottish Baronial style of architecture: the house is recognized as a highly influential creation with themes from Abbotsford being reflected across many buildings in the Scottish Borders and beyond.
The manor as a whole appears as a "castle-in-miniature", with small towers and imitation battlements decorating the house and garden walls. Into various parts of the fabric were built relics and curiosities from historical structures, such as the doorway of the old Tolbooth in Edinburgh.
Scott collected many of these curiosities to be built into the walls of the South Garden, which previously hosted a colonnade of gothic arches along the garden walls. Along the path of the former colonnade sits the remains of Edinburgh's 15th century Mercat Cross and several examples of classical sculpture.
The estate and its neo-Medieval features nod towards Scott's desire for a historical feel, but the writer ensured that the house would provide all the comforts of modern living. As a result, Scott used the space as a proving-ground for new technologies. The house was outfitted with early gas lighting and pneumatic bells connecting residents with servants elsewhere in the house.
Scott had only enjoyed his residence one year when (1825) he met with that reverse of fortune which involved the estate in debt. In 1830, the library and museum were presented to him as a free gift by the creditors. The property was wholly disencumbered in 1847 by Robert Cadell, the publisher, who cancelled the bond upon it in exchange for the family's share in the copyright of Sir Walter's works.
Scott's only son Walter did not live to enjoy the property, having died on his way from India in 1847. Among subsequent possessors were Scott's grandson Walter Scott Lockhart (later Walter Lockhart Scott, 1826–1853), his younger sister Charlotte Harriet Jane Hope-Scott (née Lockhart) 1828–1858, J. R. Hope Scott, QC, and his daughter (Scott's great-granddaughter), the Hon. Mrs Maxwell Scott.
The house was opened to the public in 1833, but continued to be occupied by Scott's descendants until 2004. The last of his direct descendants to hold the Lairdship of Abbotsford was his great-great-great-granddaughter Dame Jean Maxwell-Scott (8 June 1923 – 5 May 2004). She inherited it from her elder sister Patricia Maxwell-Scott in 1998. The sisters turned the house into one of Scotland's premier tourist attractions, after they had to rely on paying visitors to afford the upkeep of the house. It had electricity installed only in 1962.
Dame Jean was at one time a lady-in-waiting to Princess Alice, Duchess of Gloucester, patron of the Dandie Dinmont Club, a breed of dog named after one of Sir Walter Scott's characters; and a horse trainer, one of whose horses, Sir Wattie, ridden by Ian Stark, won two silver medals at the 1988 Summer Olympics.
On Dame Jean's death the Abbotsford Trust was established to safeguard the estate.
In 2005, Scottish Borders Council considered an application by a property developer to build a housing estate on the opposite bank of the River Tweed from Abbotsford, to which Historic Scotland and the National Trust for Scotland objected. There have been modifications to the proposed development, but it is still being opposed in 2020.
Sir Walter Scott rescued the "jougs" from Threave Castle in Dumfries and Galloway and attached them to the castellated gateway he built at Abbotsford.
Tweedbank railway station is located near to Abbotsford.
Miscellaneous.
Abbotsford gave its name to the Abbotsford Club, founded by William Barclay Turnbull in 1833 or 1834 in Scott's honour, and a successor to the Bannatyne and Maitland Clubs. It was a text publication society, which existed to print and publish historical works connected with Scott's writings. Its publications extended from 1835 to 1864.
In August 2012, a new Visitor Centre opened at Abbotsford which houses a small exhibition, gift shop and Ochiltree's café with views over the house and grounds. The house re-opened to the public after extensive renovations in July 2013.
In 2014 it won the European Union Prize for Cultural Heritage / Europa Nostra Award for its then recent conservation project.
References.
Attribution
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Abraham
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Abraham (originally Abram) is the common Hebrew patriarch of the Abrahamic religions, including Judaism, Christianity, and Islam. In Judaism, he is the founding father who began the covenantal relationship between the Jewish people and God; in Christianity, he is the spiritual progenitor of all believers, whether Jewish or non-Jewish; and in Islam, he is a link in the chain of Islamic prophets that begins with Adam and culminates in Muhammad. Abraham is also revered in other Abrahamic religions such as the Baháʼí Faith and the Druze faith.
The story of the life of Abraham, as told in the narrative of the Book of Genesis in the Hebrew Bible, revolves around the themes of posterity and land. He is said to have been called by God to leave the house of his father Terah and settle in the land of Canaan, which God now promises to Abraham and his progeny. This promise is subsequently inherited by Isaac, Abraham's son by his wife Sarah, while Isaac's half-brother Ishmael is also promised that he will be the founder of a great nation. Abraham purchases a tomb (the Cave of the Patriarchs) at Hebron to be Sarah's grave, thus establishing his right to the land; and, in the second generation, his heir Isaac is married to a woman from his own kin to earn his parents' approval. Abraham later marries Keturah and has six more sons; but, on his death, when he is buried beside Sarah, it is Isaac who receives "all Abraham's goods" while the other sons receive only "gifts".
Most scholars view the patriarchal age, along with the Exodus and the period of the biblical judges, as a late literary construct that does not relate to any particular historical era. It is largely concluded that the Torah, the series of books that includes Genesis, was composed during the Persian period, as a result of tensions between Jewish landowners who had stayed in Judah during the Babylonian captivity and traced their right to the land through their "father Abraham", and the returning exiles who based their counterclaim on Moses and the Exodus tradition of the Israelites.
The Abraham Cycle.
Structure and narrative programs.
The Abraham cycle (–) unfolds as a narrative of mounting tension, centered on the conflict between God's promise that Abram would father a lineage and become the ancestor of numerous nations, and a succession of crises that jeopardize this divine commitment. The storytelling method used here is the “obstacle story,” a literary device renowned for its enduring and universal popularity across cultures and eras.
The Abraham cycle is not structured by a unified plot centered on a conflict and its resolution or a problem and its solution. The episodes are often only loosely linked, and the sequence is not always logical, but it is unified by the presence of Abraham himself, as either actor or witness, and by the themes of posterity and land. These themes form "narrative programs" set out in concerning the sterility of Sarah and in which Abraham is ordered to leave the land of his birth for the land God will show him.
Origins and calling.
Terah, the ninth in descent from Noah, was the father of Abram, Nahor, Haran ( "Hārān") and Sarah. Haran was the father of Lot, who was Abram's nephew; the family lived in Ur of the Chaldees. Haran died there. Abram married Sarah (Sarai). Terah, Abram, Sarai, and Lot departed for Canaan, but settled in a place named Haran ( "Ḥārān"), where Terah died at the age of 205. According to some exegetes (like Nahmanides), Abram was actually born in Haran and he later relocated to Ur, while some of his family remained in Haran.
God had told Abram to leave his country and kindred and go to a land that he would show him, and promised to make of him a great nation, bless him, make his name great, bless them that bless him, and curse them who may curse him. Abram was 75 years old when he left Haran with his wife Sarai, his nephew Lot, and their possessions and people that they had acquired, and traveled to Shechem in Canaan.
Sarai.
There was a severe famine in the land of Canaan, so that Abram, Lot, and their households traveled to Egypt. On the way Abram told Sarai to say that she was his sister, so that the Egyptians would not kill him. When they entered Egypt, the Pharaoh's officials praised Sarai's beauty to Pharaoh, and they took her into the palace and gave Abram goods in exchange. God afflicted Pharaoh and his household with plagues, which led Pharaoh to try to find out what was wrong. Upon discovering that Sarai was a married woman, Pharaoh demanded that Abram and Sarai leave.
Abram and Lot separate.
When they lived for a while in the Negev after being banished from Egypt and came back to the Bethel and Ai area, Abram's and Lot's sizable herds occupied the same pastures. This became a problem for the herdsmen, who were assigned to each family's cattle. The conflicts between herdsmen had become so troublesome that Abram suggested that Lot choose a separate area, either on the left hand or on the right hand, that there be no conflict between them. Lot decided to go eastward to the plain of Jordan, where the land was well watered everywhere as far as Zoara, and he dwelled in the cities of the plain toward Sodom. Abram went south to Hebron and settled in the plain of Mamre, where he built another altar to worship God.
Chedorlaomer.
During the rebellion of the Jordan River cities, Sodom and Gomorrah, against Elam, Abram's nephew, Lot, was taken prisoner along with his entire household by the invading Elamite forces. The Elamite army came to collect the spoils of war, after having just defeated the king of Sodom's armies. Lot and his family, at the time, were settled on the outskirts of the Kingdom of Sodom which made them a visible target.
One person who escaped capture came and told Abram what happened. Once Abram received this news, he immediately assembled 318 trained servants. Abram's force headed north in pursuit of the Elamite army, who were already worn down from the Battle of Siddim. When they caught up with them at Dan, Abram devised a battle plan by splitting his group into more than one unit, and launched a night raid. Not only were they able to free the captives, Abram's unit chased and slaughtered the Elamite King Chedorlaomer at Hobah, just north of Damascus. They freed Lot, as well as his household and possessions, and recovered all of the goods from Sodom that had been taken.
Upon Abram's return, Sodom's king came out to meet with him in the Valley of Shaveh, the "king's dale". Also, Melchizedek king of Salem (Jerusalem), a priest of El Elyon, brought out bread and wine and blessed Abram and God. Abram then gave Melchizedek a tenth of everything. The king of Sodom then offered to let Abram keep all the possessions if he would merely return his people. Abram declined to accept anything other than the share to which his allies were entitled.
Covenant of the pieces.
The voice of the Lord came to Abram in a vision and repeated the promise of the land and descendants as numerous as the stars. Abram and God made a covenant ceremony, and God told of the future bondage of Israel in Egypt. God described to Abram the land that his offspring would claim: the land of the Kenites, Kenizzites, Kadmonites, Hittites, Perizzites, Rephaims, Amorites, Canaanites, Girgashites, and Jebusites.
Hagar.
Abram and Sarai tried to make sense of how he would become a progenitor of nations, because after 10 years of living in Canaan, no child had been born. Sarai then offered her Egyptian slave, Hagar, to Abram with the intention that she would bear him a son.
After Hagar found she was pregnant, she began to despise her mistress, Sarai. Sarai responded by mistreating Hagar, and Hagar fled into the wilderness. An angel spoke with Hagar at the fountain on the way to Shur. He instructed her to return to Abram's camp and that her son would be "a wild ass of a man; his hand shall be against every man, and every man's hand against him; and he shall dwell in the face of all his brethren." She was told to call her son Ishmael. Hagar then called God who spoke to her "El-roi", ("Thou God seest me:" KJV). From that day onward, the well was called Beer-lahai-roi, ("The well of him that liveth and seeth me." KJV margin), located between Kadesh and Bered. She then did as she was instructed by returning to her mistress in order to have her child. Abram was 86 years of age when Ishmael was born.
Sarah.
Thirteen years later, when Abram was 99 years of age, God declared Abram's new name: "Abraham" – "a father of many nations". Abraham then received the instructions for the covenant of the pieces, of which circumcision was to be the sign.
God declared Sarai's new name: "Sarah", blessed her, and told Abraham, "I will give thee a son also of her". Abraham laughed, and "said in his heart, 'Shall a "child" be born unto him that is a hundred years old? and shall Sarah, that is ninety years old, bear [a child]?'" Immediately after Abraham's encounter with God, he had his entire household of men, including himself (age 99) and Ishmael (age 13), circumcised.
Three visitors.
Not long afterward, during the heat of the day, Abraham had been sitting at the entrance of his tent by the terebinths of Mamre. He looked up and saw three men in the presence of God. Then he ran and bowed to the ground to welcome them. Abraham then offered to wash their feet and fetch them a morsel of bread, to which they assented. Abraham rushed to Sarah's tent to order ash cakes made from choice flour, then he ordered a servant-boy to prepare a choice calf. When all was prepared, he set curds, milk and the calf before them, waiting on them, under a tree, as they ate.
One of the visitors told Abraham that upon his return next year, Sarah would have a son. While at the tent entrance, Sarah overheard what was said and she laughed to herself about the prospect of having a child at their ages. The visitor inquired of Abraham why Sarah laughed at bearing a child at her age, as nothing is too hard for God. Frightened, Sarah denied laughing.
Abraham's plea.
After eating, Abraham and the three visitors got up. They walked over to the peak that overlooked the 'cities of the plain' to discuss the fate of Sodom and Gomorrah for their detestable sins that were so great, it moved God to action. Because Abraham's nephew was living in Sodom, God revealed plans to confirm and judge these cities. At this point, the two other visitors left for Sodom. Then Abraham turned to God and pleaded decrementally with Him (from fifty persons to less) that "if there were at least ten righteous men found in the city, would not God spare the city?" For the sake of ten righteous people, God declared that he would not destroy the city.
When the two visitors arrived in Sodom to conduct their report, they planned on staying in the city square. However, Abraham's nephew, Lot, met with them and strongly insisted that these two "men" stay at his house for the night. A rally of men stood outside of Lot's home and demanded that Lot bring out his guests so that they may "know" ( 5) them. However, Lot objected and offered his virgin daughters who had not "known" (v. 8) man to the rally of men instead. They rejected that notion and sought to break down Lot's door to get to his male guests, thus confirming the wickedness of the city and portending their imminent destruction.
Early the next morning, Abraham went to the place where he stood before God. He "looked out toward Sodom and Gomorrah" and saw what became of the cities of the plain, where not even "ten righteous" (v. 18:32) had been found, as "the smoke of the land went up as the smoke of a furnace."
Abimelech.
Abraham settled between Kadesh and Shur in what the Bible anachronistically calls "the land of the Philistines". While he was living in Gerar, Abraham openly claimed that Sarah was his sister. Upon discovering this news, King Abimelech had her brought to him. God then came to Abimelech in a dream and declared that taking her would result in death because she was a man's wife. Abimelech had not laid hands on her, so he inquired if he would also slay a righteous nation, especially since Abraham had claimed that he and Sarah were siblings. In response, God told Abimelech that he did indeed have a blameless heart and that is why he continued to exist. However, should he not return the wife of Abraham back to him, God would surely destroy Abimelech and his entire household. Abimelech was informed that Abraham was a prophet who would pray for him.
Early next morning, Abimelech informed his servants of his dream and approached Abraham inquiring as to why he had brought such great guilt upon his kingdom. Abraham stated that he thought there was no fear of God in that place, and that they might kill him for his wife. Then Abraham defended what he had said as not being a lie at all: "And yet indeed "she is" my sister; she "is" the daughter of my father, but not the daughter of my mother; and she became my wife." Abimelech returned Sarah to Abraham, and gave him gifts of sheep, oxen, and servants; and invited him to settle wherever he pleased in Abimelech's lands. Further, Abimelech gave Abraham a thousand pieces of silver to serve as Sarah's vindication before all. Abraham then prayed for Abimelech and his household, since God had stricken the women with infertility because of the taking of Sarah.
After living for some time in the land of the Philistines, Abimelech and Phicol, the chief of his troops, approached Abraham because of a dispute that resulted in a violent confrontation at a well. Abraham then reproached Abimelech due to his Philistine servant's aggressive attacks and the seizing of Abraham's Well. Abimelech claimed ignorance of the incident. Then Abraham offered a pact by providing sheep and oxen to Abimelech. Further, to attest that Abraham was the one who dug the well, he also gave Abimelech seven ewes for proof. Because of this sworn oath, they called the place of this well: Beersheba. After Abimelech and Phicol headed back to Philistia, Abraham planted a tamarisk grove in Beersheba and called upon "the name of the , the everlasting God."
Isaac.
As had been prophesied in Mamre the previous year, Sarah became pregnant and bore a son to Abraham, on the first anniversary of the covenant of circumcision. Abraham was "an hundred years old", when his son whom he named Isaac was born; and he circumcised him when he was eight days old. For Sarah, the thought of giving birth and nursing a child, at such an old age, also brought her much laughter, as she declared, "God hath made me to laugh, so that all who hear will laugh with me." Isaac continued to grow and on the day he was weaned, Abraham held a great feast to honor the occasion. During the celebration, however, Sarah found Ishmael mocking; an observation that would begin to clarify the birthright of Isaac.
Ishmael.
Ishmael was fourteen years old when Abraham's son Isaac was born to Sarah. When she found Ishmael teasing Isaac, Sarah told Abraham to send both Ishmael and Hagar away. She declared that Ishmael would not share in Isaac's inheritance. Abraham was greatly distressed by his wife's words and sought the advice of his God. God told Abraham not to be distressed but to do as his wife commanded. God reassured Abraham that "in Isaac shall seed be called to thee." He also said Ishmael would make a nation, "because he is thy seed".
Early the next morning, Abraham brought Hagar and Ishmael out together. He gave her bread and water and sent them away. The two wandered in the wilderness of Beersheba until her bottle of water was completely consumed. In a moment of despair, she burst into tears. After God heard the boy's voice, an angel of the Lord confirmed to Hagar that he would become a great nation, and will be "living on his sword". A well of water then appeared so that it saved their lives. As the boy grew, he became a skilled archer living in the wilderness of Paran. Eventually his mother found a wife for Ishmael from her home country, the land of Egypt.
Binding of Isaac.
At some point in Isaac's youth, Abraham was commanded by God to offer his son up as a sacrifice in the land of Moriah. The patriarch traveled three days until he came to the mount that God told him of. He then commanded the servants to remain while he and Isaac proceeded alone into the mount. Isaac carried the wood upon which he would be sacrificed. Along the way, Isaac asked his father where the animal for the burnt offering was, to which Abraham replied "God will provide himself a lamb for a burnt offering". Just as Abraham was about to sacrifice his son, he was interrupted by the angel of the Lord, and he saw behind him a "ram caught in a thicket by his horns", which he sacrificed instead of his son. The place was later named as Jehovah-jireh. For his obedience he received another promise of numerous descendants and abundant prosperity. After this event, Abraham went to Beersheba.
Later years.
Sarah died, and Abraham buried her in the Cave of the Patriarchs (the "cave of Machpelah"), near Hebron which he had purchased along with the adjoining field from Ephron the Hittite. After the death of Sarah, Abraham took another wife, a concubine named Keturah, by whom he had six sons: Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. According to the Bible, reflecting the change of his name to "Abraham" meaning "a father of many nations", Abraham is considered to be the progenitor of many nations mentioned in the Bible, among others the Israelites, Ishmaelites, Edomites, Amalekites, Kenizzites, Midianites and Assyrians, and through his nephew Lot he was also related to the Moabites and Ammonites. Abraham lived to see Isaac marry Rebekah, and to see the birth of his twin grandsons Jacob and Esau. He died at age 175, and was buried in the cave of Machpelah by his sons Isaac and Ishmael.
Historical context.
Historicity.
In the early and middle 20th century, leading archaeologists such as William F. Albright and G. Ernest Wright and biblical scholars such as Albrecht Alt and John Bright believed that the patriarchs and matriarchs were either real individuals or believable composites of people who lived in the "patriarchal age", the 2nd millennium BCE. However, in the 1970s, new arguments concerning Israel's past and the biblical texts challenged these views; these arguments can be found in Thomas L. Thompson's "The Historicity of the Patriarchal Narratives" (1974), and John Van Seters' "Abraham in History and Tradition" (1975). Thompson, a literary scholar, based his argument on archaeology and ancient texts. His thesis centered on the lack of compelling evidence that the patriarchs lived in the 2nd millennium BCE, and noted how certain biblical texts reflected first millennium conditions and concerns. Van Seters examined the patriarchal stories and argued that their names, social milieu, and messages strongly suggested that they were Iron Age creations. Van Seters' and Thompson's works were a paradigm shift in biblical scholarship and archaeology, which gradually led scholars to no longer consider the patriarchal narratives as historical. Some conservative scholars attempted to defend the Patriarchal narratives in the following years, but this has not found acceptance among scholars. By the beginning of the 21st century, archaeologists had stopped trying to recover any context that would make Abraham, Isaac or Jacob credible historical figures.
Origins of the narrative.
Abraham's story, like those of the other patriarchs, most likely had a substantial oral prehistory (he is mentioned in the Book of Ezekiel and the Book of Isaiah). As with Moses, Abraham's name is apparently very ancient, as the tradition found in the Book of Genesis no longer understands its original meaning (probably "Father is exalted" – the meaning offered in , "Father of a multitude", is a folk etymology). At some stage the oral traditions became part of the written tradition of the Pentateuch; a majority of scholars believe this stage belongs to the Persian period, roughly 520–320 BCE. The mechanisms by which this came about remain unknown, but there are currently at least two hypotheses. The first, called Persian Imperial authorisation, is that the post-Exilic community devised the Torah as a legal basis on which to function within the Persian Imperial system; the second is that the Pentateuch was written to provide the criteria for determining who would belong to the post-Exilic Jewish community and to establish the power structures and relative positions of its various groups, notably the priesthood and the lay "elders".
The completion of the Torah and its elevation to the centre of post-Exilic Judaism was as much or more about combining older texts as writing new ones – the final Pentateuch was based on existing traditions. In the Book of Ezekiel, written during the Exile (i.e., in the first half of the 6th century BCE), Ezekiel, an exile in Babylon, tells how those who remained in Judah are claiming ownership of the land based on inheritance from Abraham; but the prophet tells them they have no claim because they do not observe Torah. The Book of Isaiah similarly testifies of tension between the people of Judah and the returning post-Exilic Jews (the "gôlâ"), stating that God is the father of Israel and that Israel's history begins with the Exodus and not with Abraham. The conclusion to be inferred from this and similar evidence (e.g., Ezra–Nehemiah), is that the figure of Abraham must have been preeminent among the great landowners of Judah at the time of the Exile and after, serving to support their claims to the land in opposition to those of the returning exiles.
Amorite origin hypothesis.
According to Nissim Amzallag, the Book of Genesis portrays Abraham as having an Amorite origin, arguing that the patriarch's provenance from the region of Harran as described in associates him with the territory of the Amorite homeland. He also notes parallels between the biblical narrative and the Amorite migration into the Southern Levant in the 2nd millennium BCE. Likewise, some scholars like Daniel E. Fleming and Alice Mandell have argued that the biblical portrayal of the Patriarchs' lifestyle appears to reflect the Amorite culture of the 2nd millennium BCE as attested in texts from the ancient city-state of Mari, suggesting that the Genesis stories retain historical memories of the ancestral origins of some of the Israelites. Alan Millard argues that the name Abram is of Amorite origin and that it is attested in Mari as "ʾabī-rām". He also suggests that the Patriarch's name corresponds to a form typical of the Middle Bronze Age and not of later periods.
Canaanite origin hypothesis.
The earliest possible reference to Abraham may be the name of a town in the Negev listed in the Bubastite Portal inscription of Pharaoh Sheshonq I (biblical Shishak), which is referred as "the Fortress of Abraham", suggesting the possible existence of an Abraham tradition in the 10th century BCE. The orientalist Mario Liverani has proposed to see in the name Abraham the eponymous ancestor of a 13th-century BCE tribe, the Raham, mentioned in a stele of Seti I found at Beth-Shean and dating back to around 1289 BCE. The tribe probably lived in the area surrounding or close to Beth-Shean, in Galilee (the stele in fact refers to battles that took place in the area). Liverani hypothesized that the members of the tribe of Raham called themselves "sons of Raham" ("*Banu-Raham"), so that the name of their eponymous ancestor would have been "father of Raham" ("*Abu-Raham"), that being the name of the patriarch Abraham. Israel Finkelstein and Thomas Römer suggested that the oldest Abraham traditions originated in the Iron Age (monarchic period) and that they contained an autochthonous hero story, as the oldest biblical references to Abraham outside the book of Genesis ( and ) do not have an indication of a Mesopotamian origin of Abraham and present only two main themes of the Abraham narrative in Genesis—land and offspring. Finkelstein and Römer considered Abraham as ancestor who was worshiped in Hebron, with the oldest tradition of him possibly being about the altar he built in Hebron.
Religious traditions.
Abraham is given a high position of respect in three major world faiths, Judaism, Christianity, and Islam. In Judaism, he is the founding father of the covenant, the special relationship between the Jewish people and God—leading to the belief that the Jews are the chosen people of God. In Christianity, Paul the Apostle taught that Abraham's faith in God—preceding the Mosaic law—made him the prototype of all believers, Jewish or gentile; and in Islam, he is seen as a link in the chain of prophets that begins with Adam and culminates in Muhammad.
Judaism.
In Jewish tradition, Abraham is called "Avraham Avinu" (אברהם אבינו), "our father Abraham", signifying that he is both the biological progenitor of the Jews and the father of Judaism, the first Jew. His story is read in the weekly Torah reading portions, predominantly in the parashot: Lech-Lecha (לֶךְ-לְךָ), Vayeira (וַיֵּרָא), Chayei Sarah (חַיֵּי שָׂרָה), and Toledot (תּוֹלְדֹת).
Hanan bar Rava taught in Abba Arikha's name that Abraham's mother was named ʾĂmatlaʾy bat Karnebo. Hiyya bar Abba taught that Abraham worked in Teraḥ's idol shop in his youth.
In "Legends of the Jews", God created heaven and earth for the sake of the merits of Abraham. After the biblical flood, Abraham was the only one among the pious who solemnly swore never to forsake God, studied in the house of Noah and Shem to learn about the "Ways of God", and continued the line of High Priest from Noah and Shem, assigning the office to Levi and his seed forever. Before leaving his father's land, Abraham was miraculously saved from the fiery furnace of Nimrod following his brave action of breaking the idols of the Chaldeans into pieces. During his sojourning in Canaan, Abraham was accustomed to extend hospitality to travelers and strangers and taught how to praise God also knowledge of God to those who had received his kindness.
Along with Isaac and Jacob, he is the one whose name would appear united with God, as God in Judaism is called "Elohei Avraham, Elohei Yitzchak, vEilohei Ya'akov" ("God of Abraham, God of Isaac, and God of Jacob"). He was also mentioned as the father of thirty nations.
Christianity.
In Christianity, Abraham is revered as the prophet to whom God chose to reveal himself and with whom God initiated a covenant (cf. "Covenant Theology"). Paul the Apostle declared that all who believe in Jesus (Christians) are "included in the seed of Abraham and are inheritors of the promise made to Abraham." In , Abraham is praised for his "unwavering faith" in God, which is tied into the concept of partakers of the covenant of grace being those "who demonstrate faith in the saving power of Christ".
Throughout history, church leaders, following Paul, have emphasized Abraham as the spiritual father of all Christians. Augustine of Hippo declared that Christians are "children (or "seed") of Abraham by faith", Ambrose stated that "by means of their faith Christians possess the promises made to Abraham", and Martin Luther recalled Abraham as "a paradigm of the man of faith."
The Roman Catholic Church, the largest Christian denomination, calls Abraham "our father in Faith" in the Eucharistic prayer of the Roman Canon, recited during the Mass. He is also commemorated in the calendars of saints of several denominations: on 20 August by the Maronite Church, 28 August in the Coptic Church and the Assyrian Church of the East (with the full office for the latter), and on 9 October by the Roman Catholic Church and the Lutheran Church–Missouri Synod. In the introduction to his 15th-century translation of the Golden Legend's account of Abraham, William Caxton noted that this patriarch's life was read in church on Quinquagesima Sunday.
He is the patron saint of those in the hospitality industry. The Eastern Orthodox Church commemorates him as the "Righteous Forefather Abraham", with two feast days in its liturgical calendar. The first time is on 9 October (for those churches which follow the traditional Julian Calendar, 9 October falls on 22 October of the modern Gregorian Calendar), where he is commemorated together with his nephew "Righteous Lot". The other is on the "Sunday of the Forefathers" (two Sundays before Christmas), when he is commemorated together with other ancestors of Jesus. Abraham is also mentioned in the Divine Liturgy of Basil the Great, just before the Anaphora, and Abraham and Sarah are invoked in the prayers said by the priest over a newly married couple. A popular hymn sung in many English-speaking Sunday Schools by children is known as "Father Abraham" and emphasizes the patriarch as the spiritual progenitor of Christians.
Islam.
Islam regards (Abraham) as a link in the chain of prophets that begins with Adam and culminates in Muhammad via (Ishmael). Abraham is mentioned in 35 chapters of the Quran, more often than any other biblical personage apart from Moses. He is called both a (monotheist) and (one who submits), and Muslims regard him as a prophet and patriarch, the archetype of the perfect Muslim, and the revered reformer of the Kaaba in Mecca. Islamic tradition considers Abraham the first "pioneer of Islam" (which is also called , the 'religion of Abraham'), and that his purpose and mission throughout his life was to proclaim the oneness of God. In Islam, Abraham holds an exalted position among the major prophets and he is referred to as , meaning 'Friend of God'. Besides and (Isaac and Jacob), Abraham is among the most excellent and honorable men in the view of God. He is also mentioned in Quran as the "Father of Muslims", and is put forward as a role model for the community.
Druze.
The Druze regard Abraham as the third spokesman ("natiq") after Adam and Noah, who helped transmit the foundational teachings of monotheism ("tawhid") intended for the larger audience. He is also among the seven prophets who appeared in different periods of history according to the Druze faith.
Mandaeism.
In Mandaeism, Abraham () is mentioned in of the "Right Ginza" as the patriarch of the Jewish people. Mandaeans consider Abraham to have been originally a Mandaean priest, however they differ with Abraham and Jews regarding circumcision which they consider to be bodily mutilation and therefore forbidden.
Baháʼí Faith.
Baháʼís considered Abraham as a Manifestation of God, and as the originator of monotheistic religion. ʻAbdu'l-Bahá states that Abraham was born in Mesopotamia, and Bahá'u'lláh states that the language which Abraham spoke, when "he crossed the Jordan", is Hebrew ("'Ibrání"), so "the language of the crossing." To ʻAbdu'l-Bahá, the Abraham was born to a family that was ignorant of the oneness of God. Abraham opposed his own people and government, and even his own kin, he rejected all their gods, and, alone and single-handed, he withstood a powerful nation. These people believed not in one God but in many gods, to whom they ascribed miracles, and hence they all rose up against Abraham. No one supported him except his nephew Lot and "one or two other individuals of no consequence". At last the intensity of his enemies' opposition obliged him, utterly wronged, to forsake his native land. Abraham then came to "these regions", that is, to the Holy Land. To Bahá'u'lláh, the "Voice of God" commanded Abraham to offer up Ishmael as a sacrifice, so that his steadfastness in the faith of God and his detachment from all else but him may be demonstrated unto men. The purpose of God, moreover, was to sacrifice him as a ransom for the sins and iniquities of all the peoples of the earth.
In the Baháʼí texts, like the Islamic texts, Abraham is often referred to as "the Friend of God". 'Abdu'l-Bahá described Abraham as the founder of monotheism.
ʻAbdu'l-Bahá also suggested the "holy manifestations who have been the sources or founders of the various religious systems" were united and agreed in purpose and teaching, and the Abraham, Moses, Zoroaster, the Buddha, Jesus, Muhammad, the Báb and Bahá'u'lláh are one in "spirit and reality".
Artistic depictions.
Painting and sculpture.
Paintings on the life of Abraham tend to focus on only a few incidents: the sacrifice of Isaac; meeting Melchizedek; entertaining the three angels; Hagar in the desert; and a few others. Additionally, Martin O'Kane, a professor of Biblical Studies, writes that the parable of Lazarus resting in the "Bosom of Abraham", as described in the Gospel of Luke, became an iconic image in Christian works. According to O'Kane, artists often chose to divert from the common literary portrayal of Lazarus sitting next to Abraham at a banquet in Heaven and instead focus on the "somewhat incongruous notion of Abraham, the most venerated of patriarchs, holding a naked and vulnerable child in his bosom". Several artists have been inspired by the life of Abraham, including Albrecht Dürer (1471–1528), Caravaggio (1573–1610), Donatello, Raphael, Philip van Dyck (Dutch painter, 1680–1753), and Claude Lorrain (French painter, 1600–1682). Rembrandt (Dutch, 1606–1669) created at least seven works on Abraham, Peter Paul Rubens (1577–1640) did several, Marc Chagall did at least five on Abraham, Gustave Doré (French illustrator, 1832–1883) did six, and James Tissot (French painter and illustrator, 1836–1902) did over twenty works on the subject.
The Sarcophagus of Junius Bassus depicts a set of biblical stories, including Abraham about to sacrifice Isaac. These sculpted scenes are on the outside of a marble Early Christian sarcophagus used for the burial of Junius Bassus. He died in 359. This sarcophagus has been described as "probably the single most famous piece of early Christian relief sculpture." The sarcophagus was originally placed in or under Old St. Peter's Basilica, was rediscovered in 1597, and is now below the modern basilica in the Museo Storico del Tesoro della Basilica di San Pietro (Museum of St. Peter's Basilica) in the Vatican. The base is approximately .
George Segal created figural sculptures by molding plastered gauze strips over live models in his 1987 work "Abraham's Farewell to Ishmael". The human condition was central to his concerns, and Segal used the Old Testament as a source for his imagery. This sculpture depicts the dilemma faced by Abraham when Sarah demanded that he expel Hagar and Ishmael. In the sculpture, the father's tenderness, Sarah's rage, and Hagar's resigned acceptance portray a range of human emotions. The sculpture was donated to the Miami Art Museum after the artist's death in 2000.
Christian iconography.
Abraham can sometimes be identified by the context of the image the meeting with Melchizedek, , or . In solo portraits a sword or knife may be used as his accessory, as in by Giovanni Maria Morlaiter or by Lorenzo Monaco.
As early as the beginning of the 3rd century, Christian art followed Christian typology in making the sacrifice of Isaac a foreshadowing of Christ's sacrifice on the cross, and its memorial in the sacrifice of the Mass. See for example engraved with Abraham's and other sacrifices taken to prefigure that of Christ in the Eucharist.
Some early Christian writers interpreted the three visitors as the triune God. Thus in Santa Maria Maggiore, Rome, portrays only the visitors against a gold ground and puts semitransparent copies of them in the "heavenly" space above the scene. In Eastern Orthodox art, the visit is the chief means by which the Trinity is pictured (). Some images do not include Abraham and Sarah, like Andrei Rublev's "Trinity", which shows only the three visitors as beardless youths at a table.
Literature.
"Fear and Trembling" (original Danish title: ) is an influential philosophical work by Søren Kierkegaard, published in 1843 under the pseudonym ("John the Silent"). Kierkegaard wanted to understand the anxiety that must have been present in Abraham when God asked him to sacrifice his son. W. G. Hardy's novel "Father Abraham" (1935) tells the fictionalized life story of Abraham. In her short story collection "Sarah and After", Lynne Reid Banks tells the story of Abraham and Sarah, with an emphasis on Sarah's view of events.
Music.
In 1681, Marc-Antoine Charpentier released a Dramatic motet (Oratorio), ' H.402 – 402 a – 402 b, for soloists, chorus, doubling instruments and continuo. Sébastien de Brossard composed a cantata ' between 1703 and 1708.
In 1994, Steve Reich released an opera named "The Cave". The title refers to the Cave of the Patriarchs. The narrative of the opera is based on the story of Abraham, and his immediate family, as it is recounted in religious texts, and understood by individuals from different cultures and religious traditions.
The eponymous track on Bob Dylan's 1965 album "Highway 61 Revisited" contains five stanzas, with someone in each describing an unusual problem that is ultimately resolved on Highway 61. In the first stanza, God tells Abraham to "kill me a son". God wants the killing done on Highway 61. "Abram", the birth name of Abraham, is also the name of Dylan's father. In 2004, "Rolling Stone" magazine ranked "Highway 61 Revisited" at number 364 in their 500 Greatest Songs of All Time.
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Abraxas
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Abraxas (, variant form ) is a word of mystic meaning in the system of the Gnostic Basilides, being there applied to the "Great Archon" (), the princeps of the 365 spheres (). The word is found in Gnostic texts such as the "Holy Book of the Great Invisible Spirit" and the Apocalypse of Adam, and also appears in the Greek Magical Papyri. It was engraved on certain antique gemstones, called on that account Abraxas stones, which were used as amulets or charms. As the initial spelling on stones was (), the spelling of seen today probably originates in the confusion made between the Greek letters sigma (Σ) and xi (Ξ) in the Latin transliteration.
The seven letters spelling its name may represent each of the seven classic planets. The word may be related to "Abracadabra", although other explanations exist.
There are similarities and differences between such figures in reports about Basilides's teaching, ancient Gnostic texts, the larger Greco-Roman magical traditions, and modern magical and esoteric writings. Speculations have proliferated on Abraxas in recent centuries, which has been claimed to be both an Egyptian god and a demon.
Etymology.
Gaius Julius Hyginus ("Fab". 183) gives "Abrax Aslo Therbeeo" as names of horses of the sun mentioned by 'Homerus'. The passage is miserably corrupt, but it may not be accidental that the first three syllables make Abraxas.
The proper form of the name is evidently "Abrasax", as with the Greek writers, Hippolytus, Epiphanius, Didymus ("De Trin". iii. 42), and Theodoret; also Augustine and "Praedestinatus"; and in nearly all the legends on gems. By a probably euphonic inversion the translator of Irenaeus and the other Latin authors have "Abraxas", which is found in the magical papyri, and even, though most sparingly, on engraved stones.
The attempts to discover a derivation for the name, Greek, Hebrew, Coptic, or other, have not been entirely successful:
Egyptian.
Chuvash linguists, the word was translated as Ouroboros
Greek.
Perhaps the word may be included among those mysterious expressions discussed by Adolf von Harnack, "which belong to no known speech, and by their singular collocation of vowels and consonants give evidence that they belong to some mystic dialect, or take their origin from some supposed divine inspiration".
The Egyptian author of the book "De Mysteriis" in reply to Porphyry (vii. 4) admits a preference of 'barbarous' to vernacular names in sacred things, urging a peculiar sanctity in the languages of certain nations, as the Egyptians and Assyrians; and Origen ("Contra Cels". i. 24) refers to the 'potent names' used by Egyptian sages, Persian Magi, and Indian Brahmins, signifying deities in the several languages.
Sources.
It is uncertain what the actual role and function of Abraxas was in the Basilidian system, as our authorities (see below) often show no direct acquaintance with the doctrines of Basilides himself.
As an archon.
In the system described by Irenaeus, "the Unbegotten Father" is the progenitor of "Nous" "Discerning Mind"; "Nous" produced "Logos" "Word, Reason"; "Logos" produced "Phronesis" "Mindfulness"; "Phronesis" produced "Sophia" "Wisdom" and "Dynamis" "Potentiality"; "Sophia" and "Dynamis" produced the principalities, powers, and angels, the last of whom create "the first heaven". They, in turn, originate a second series, who create a second heaven. The process continues in like manner until 365 heavens are in existence, the angels of the last or visible heaven being the authors of our world. "The ruler" ["principem", i.e., probably "ton archonta"] of the 365 heavens "is Abraxas, and for this reason he contains within himself 365 numbers".
The name occurs in the "Refutation of All Heresies" (vii. 26) by Hippolytus, who appears in these chapters to have followed the "Exegetica" of Basilides. After describing the manifestation of the Gospel in the Ogdoad and Hebdomad, he adds that the Basilidians have a long account of the innumerable creations and powers in the several 'stages' of the upper world ("diastemata"), in which they speak of 365 heavens and say that "their great archon" is Abrasax, because his name contains the number 365, the number of the days in the year; i.e. the sum of the numbers denoted by the Greek letters in ΑΒΡΑΣΑΞ according to the rules of isopsephy is 365:
As a god.
Epiphanius ("Haer". 69, 73 f.) appears to follow partly Irenaeus, partly the lost Compendium of Hippolytus. He designates Abraxas more distinctly as "the power above all, and First Principle", "the cause and first archetype" of all things; and mentions that the Basilidians referred to 365 as the number of parts ("mele") in the human body, as well as of days in the year.
The author of the appendix to Tertullian "De Praescr. Haer". (c. 4), who likewise follows Hippolytus's Compendium, adds some further particulars; that 'Abraxas' gave birth to Mind ("nous"), the first in the series of primary powers enumerated likewise by Irenaeus and Epiphanius; that the world, as well as the 365 heavens, was created in honour of 'Abraxas'; and that Christ was sent not by the Maker of the world but by 'Abraxas'.
Nothing can be built on the vague allusions of Jerome, according to whom 'Abraxas' meant for Basilides "the greatest God" ("De vir. ill". 21), "the highest God" ("Dial. adv. Lucif". 23), "the Almighty God" ("Comm. in Amos" iii. 9), and "the Lord the Creator" ("Comm. in Nah". i. 11). The notices in Theodoret ("Haer. fab". i. 4), Augustine ("Haer". 4), and 'Praedestinatus' (i. 3), have no independent value.
It is evident from these particulars that Abrasax was the name of the first of the 365 Archons, and accordingly stood below Sophia and Dynamis and their progenitors; but his position is not expressly stated, so that the writer of the supplement to Tertullian had some excuse for confusing him with "the Supreme God".
As an aeon.
With the availability of primary sources, such as those in the Nag Hammadi library, the identity of Abraxas remains unclear. The "Holy Book of the Great Invisible Spirit", for instance, refers to Abraxas as an Aeon dwelling with Sophia and other Aeons of the Pleroma in the light of the luminary Eleleth. In several texts, the luminary Eleleth is the last of the luminaries (Spiritual Lights) that come forward, and it is the Aeon Sophia, associated with Eleleth, who encounters darkness and becomes involved in the chain of events that leads to the Demiurge's rule of this world, and the salvage effort that ensues. As such, the role of Aeons of Eleleth, including Abraxas, Sophia, and others, pertains to this outer border of the Pleroma that encounters the ignorance of the world of Lack and interacts to rectify the error of ignorance in the world of materiality.
In the Apocalypse of Adam, Abrasax is sent along with Sablo and Gamaliel to bring some of the Gnostic people "out of the fire and the wrath, and take them above the aeons and the rulers of the powers, and take them away [...] of life [...] and take them away [...] aeons [...] dwelling place of the great [...] there, with the holy angels and the aeons. The men will be like those angels, for they are not strangers to them."
As a demon.
The Catholic church later deemed Abraxas a pagan god, and ultimately branded him a demon as documented in J. Collin de Plancy's "Infernal Dictionary", Abraxas (or Abracax) is labeled the "supreme God" of the Basilidians, whom he describes as "heretics of the second century". He further indicated the Basilidians attributed to Abraxas the rule over "365 skies" and "365 virtues". In a final statement on Basilidians, de Plancy states that their view was that Jesus Christ was merely a "benevolent ghost sent on Earth by Abraxas".
Abraxas stones.
A vast number of engraved stones are in existence, to which the name "Abraxas-stones" has long been given. One particularly fine example was included as part of the Thetford treasure from fourth century Norfolk, England. The subjects are mythological, and chiefly grotesque, with various inscriptions, in which ΑΒΡΑΣΑΞ often occurs, alone or with other words. Sometimes the whole space is taken up with the inscription. In certain obscure magical writings of Egyptian origin ἀβραξάς or ἀβρασάξ is found associated with other names which frequently accompany it on gems; it is also found on the Greek metal tesseræ among other mystic words. The meaning of the legends is seldom intelligible: but some of the gems are amulets; and the same may be the case with nearly all.
Anguipede.
In a great majority of instances the name Abraxas is associated with a singular composite figure, having a Chimera-like appearance somewhat resembling a basilisk or the Greek primordial god Chronos (not to be confused with the Greek titan Cronus). According to E. A. Wallis Budge, "as a Pantheus, i.e. All-God, he appears on the amulets with the head of a cock (Phœbus) or of a lion (Ra or Mithras), the body of a man, and his legs are serpents which terminate in scorpions, types of the Agathodaimon. In his right hand he grasps a club, or a flail, and in his left is a round or oval shield." This form was also referred to as the Anguipede. Budge surmised that Abrasax was "a form of the Adam Kadmon of the Kabbalists and the Primal Man whom God made in His own image".
Some parts at least of the figure mentioned above are solar symbols, and the Basilidian Abrasax is manifestly connected with the sun. J. J. Bellermann has speculated that "the whole represents the Supreme Being, with his Five great Emanations, each one pointed out by means of an expressive emblem. Thus, from the human body, the usual form assigned to the Deity, forasmuch as it is written that God created man in his own image, issue the two supporters, "Nous" and "Logos", symbols of the inner sense and the quickening understanding, as typified by the serpents, for the same reason that had induced the old Greeks to assign this reptile for an attribute to Pallas. His head—a cock's—represents "Phronesis", the fowl being emblematical of foresight and vigilance. His two hands bear the badges of "Sophia" and "Dynamis", the shield of Wisdom, and the scourge of Power."
Origin.
In the absence of other evidence to show the origin of these curious relics of antiquity the occurrence of a name known as Basilidian on patristic authority has not unnaturally been taken as a sufficient mark of origin, and the early collectors and critics assumed this whole group to be the work of Gnostics. During the last three centuries attempts have been made to sift away successively those gems that had no claim to be considered in any sense Gnostic, or specially Basilidian, or connected with Abrasax. The subject is one which has exercised the ingenuity of many savants, but it may be said that all the engraved stones fall into three classes:
While it would be rash to assert positively that no existing gems were the work of Gnostics, there is no valid reason for attributing all of them to such an origin. The fact that the name occurs on these gems in connection with representations of figures with the head of a cock, a lion, or an ass, and the tail of a serpent was formerly taken in the light of what Irenaeus says about the followers of Basilides:
Incantations by mystic names were characteristic of the hybrid Gnosticism planted in Spain and southern Gaul at the end of the fourth century and at the beginning of the fifth, which Jerome connects with Basilides and which (according to his "Epist"., lxxv.) used the name Abraxas.
It is therefore not unlikely that some Gnostics used amulets, though the confident assertions of modern writers to this effect rest on no authority. Isaac de Beausobre properly calls attention to the significant silence of Clement in the two passages in which he instructs the Christians of Alexandria on the right use of rings and gems, and the figures which may legitimately be engraved on them ("Paed". 241 ff.; 287 ff.). But no attempt to identify the figures on existing gems with the personages of Gnostic mythology has had any success, and "Abraxas" is the only Gnostic term found in the accompanying legends that is not known to belong to other religions or mythologies. The present state of the evidence therefore suggests that their engravers and the Basilidians received the mystic name from a common source now unknown.
Magical papyri.
Having due regard to the magic papyri, in which many of the unintelligible names of the Abrasax-stones reappear, besides directions for making and using gems with similar figures and formulas for magical purposes, it can scarcely be doubted that many of these stones are pagan amulets and instruments of magic.
The magic papyri reflect the same ideas as the Abrasax-gems and often bear Hebraic names of God. The following example is illustrative: "I conjure you by Iaō Sabaōth Adōnai Abrasax, and by the great god, Iaeō". The patriarchs are sometimes addressed as deities; for which fact many instances may be adduced. In the group "Iakoubia, Iaōsabaōth Adōnai Abrasax", the first name seems to be composed of Jacob and Ya. Similarly, entities considered angels in Judaism are invoked as gods alongside Abrasax: thus "I conjure you ... by the god Michaēl, by the god Souriēl, by the god Gabriēl, by the god Raphaēl, by the god Abrasax Ablathanalba Akrammachari ...".
In text PGM V. 96–172, Abraxas is identified as part of the "true name which has been transmitted to the prophets of Israel" of the "Headless One, who created heaven and earth, who created night and day ... Osoronnophris whom none has ever seen ... awesome and invisible god with an empty spirit"; the name also includes Iaō and Adōnai. "Osoronnophris" represents Egyptian "Wsir Wn-nfr", "Osiris the Perfect Being". Another identification with Osiris is made in PGM VII. 643-51: "you are not wine, but the guts of Osiris, the guts of ... Ablanathanalba Akrammachamarei Eee, who has been stationed over necessity, Iakoub Ia Iaō Sabaōth Adōnai Abrasax." PGM VIII. 1-63, on the other hand, identifies Abraxas as a name of "Hermes" (i.e. Thoth). Here the numerological properties of the name are invoked, with its seven letters corresponding to the seven planets and its isopsephic value of 365 corresponding to the days of the year. Thoth is also identified with Abrasax in PGM LXXIX. 1-7: "I am the soul of darkness, Abrasax, the eternal one, Michaēl, but my true name is Thōouth, Thōouth."
One papyrus titled the "Monad" or the "Eighth Book of Moses" (PGM XIII. 1–343) contains an invocation to a supreme creator God; Abraxas is given as being the name of this God in the language of the baboons. The papyrus goes on to describe a cosmogonic myth about Abraxas, describing how he created the Ogdoad by laughing. His first laughter created light; his second divided the primordial waters; his third created the mind; his fourth created fertility and procreation; his fifth created fate; his sixth created time (as the sun and moon); and his seventh and final laughter created the soul. Then, from various sounds made by Abrasax, there arose the serpent Python who "foreknew all things", the first man (or Fear), and the god Iaō, "who is lord of all". The man fought with Iaō, and Abrasax declared that Iaō's power would derive from both of the others, and that Iaō would take precedence over all the other gods. This text also describes Helios as an archangel of God/Abrasax.
The Leyden Papyrus recommends that this invocation be pronounced to the moon:
The magic word "Ablanathanalba", which reads in Greek the same backward as forward, also occurs in the Abraxas-stones as well as in the magic papyri. This word is usually conceded to be derived from the Hebrew (Aramaic), meaning "Thou art our father" (אב לן את), and also occurs in connection with Abraxas; the following inscription is found upon a metal plate in the Karlsruhe Museum:
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Absalom
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Absalom ( , ), according to the Hebrew Bible, was an Israelite prince. Born to David and Maacah, who was from Geshur, he was the only full sibling of Tamar. He is described in the Hebrew Bible as being exceptionally beautiful, as is his sister. In the narrative of 2 Samuel 13, his sister Tamar takes refuge at his house after she is raped by their paternal half-brother Amnon (born to David and Ahinoam, who was from Jezreel); David is angered by the incident, but does nothing, as Amnon is his heir apparent. Infuriated by the rape and David's inaction, Absalom assassinates Amnon and subsequently flees to Geshur, which is ruled by his and Tamar's maternal grandfather Talmai.
Following three years in exile, he returns to Israel and rallies popular support against the House of David. A war ensues when Absalom's rebels mobilize at Hebron and begin fighting David's army in an attempt to overthrow him, but their revolt ends in failure when Absalom is killed by David's nephew and army commander Joab during the Battle of the Wood of Ephraim. In the aftermath of his death, Absalom's sister is described as being left "a desolate woman in her brother's house" and the sole guardian of his orphaned daughter, who is also named Tamar.
Biblical narrative.
Background.
Absalom, David's third son, by Maacah, was born in Hebron. At an early age, he moved, along with the transfer of the capital, to Jerusalem, where he spent most of his life. He was a great favorite of his father and of the people. His charming manners, personal beauty, insinuating ways, love of pomp, and royal pretensions captivated the hearts of the people from the beginning. He lived in great style, drove in a magnificent chariot, and had fifty men run before him.
Little is known of Absalom's family life, but the biblical narrative states that he had three sons and one daughter, Tamar, who is described as a beautiful woman. From the language of 2 Samuel 18:18, Absalom states, "I have no son to keep my name in remembrance". It may be that his sons died before his statement, or, as Matthew Henry suggests, Absalom's three sons may have been born "after" his statement.
Aside from his daughter Tamar, Absalom had another daughter or granddaughter, Maacah, who later became the favorite wife of Rehoboam. Maacah was the mother of Abijah of Judah and the grandmother of Asa of Judah. She served as queen mother for Asa until he deposed her for idolatry.
Murder of Amnon.
Absalom also had a sister named Tamar, who was raped by her half-brother Amnon, David's eldest son. Absalom waited two years after the rape for vengeance, sending his servants to murder a drunken Amnon at a feast to which Absalom had invited all of King David's sons.
After this murder, Absalom fled to his maternal grandfather Talmai, the king of Geshur. Not until three years later was Absalom fully reinstated in David's favour and finally returned to Jerusalem.
The revolt at Hebron.
In Jerusalem, Absalom built support for himself by speaking to those who came to King David for justice, saying, "See, your claims are good and right; but there is no one deputed by the king to hear you", perhaps reflecting flaws in the judicial system of the united monarchy. "If only I were the judge of the land! Then all who had a suit or cause might come to me, and I would give them justice." He made gestures of flattery by kissing those who bowed before him instead of accepting supplication. He "stole the hearts of the people of Israel".
After four years, he declared himself king, raised a revolt at Hebron, the former capital, and publicly raped his father's ten concubines. It is said that this was God punishing David for his sin with Bathsheba tenfold. All Israel and Judah flocked to him, and David, attended only by the Cherethites and Pelethites and his former bodyguard, which had followed him from Gath, found it expedient to flee. The priests Zadok and Abiathar remained in Jerusalem, and their sons Jonathan and Ahimaaz served as David's spies. Absalom reached the capital and consulted with the renowned Ahitophel (sometimes spelled Achitophel). It is also speculated that Ahitophel could have joined Absalom's cause as David had previously committed adultery with his granddaughter, Bathsheba.
David took refuge from Absalom's forces beyond the Jordan River. However, he took the precaution of instructing a servant, Hushai, to infiltrate Absalom's court and subvert it. Once in place, Hushai convinced Absalom to ignore Ahitophel's advice to attack his father while he was on the run, and instead to prepare his forces for a major attack. This gave David critical time to prepare his own troops for the battle. When Ahitophel saw that his advice was not followed, he committed suicide by hanging himself.
Battle of Ephraim's Wood.
A fateful battle was fought in the Wood of Ephraim (the name suggests a locality west of the Jordan) and Absalom's army was completely routed. When Absalom fled from David's army, his head was caught in the boughs of an oak tree as the mule he was riding ran beneath it. He was discovered there still alive by one of David's men, who reported this to Joab, the king's commander. Joab, accustomed to avenging himself, took this opportunity to even the score with Absalom. Absalom had once set Joab's field of barley on fire and then made Amasa Captain of the Host instead of Joab. Killing Absalom was against David's explicit command, "Beware that none touch the young man Absalom". Joab injured Absalom with three darts through the heart and Absalom was subsequently killed by ten of Joab's armor-bearers.
When David heard that Absalom was killed, although not how he was killed, he greatly sorrowed.
David withdrew to the city of Mahanaim in mourning, until Joab roused him from "the extravagance of his grief" and called on him to fulfill his duty to his people.
Memorial.
Absalom had erected a monument near Jerusalem to perpetuate his name:
An ancient monument in the Kidron Valley near the Old City of Jerusalem, known as the Tomb of Absalom or Absalom's Pillar and traditionally identified as the monument of the biblical narrative, is now dated by modern archeologists to the first century AD. The Jewish Encyclopedia reports: "A tomb twenty feet high and twenty-four feet square, which late tradition points out as the resting-place of Absalom. It is situated in the eastern part of the valley of Kidron, to the east of Jerusalem. In all probability it is the tomb of Alexander Jannæus (Conder, in Hastings' "Dict. Bible", article "Jerusalem", p. 597). It existed in the days of Josephus. However, archaeologists have now dated the tomb to the 1st century AD. In a 2013 conference, Professor Gabriel Barkay suggested that it could be the tomb of Herod Agrippa I, the grandson of Herod the Great, based in part on the similarity to Herod's newly discovered tomb at Herodium. For centuries, it was the custom among passers-by—Jews, Christians and Muslims—to throw stones at the monument. Residents of Jerusalem would bring their unruly children to the site to teach them what became of a rebellious son.
Rabbinic literature.
The explanation in Rabbinic literature about why Ahithophel had advised Absalom to act against his father: The Talmud speaks of this counsellor of David as "a man, like Balaam, whose great wisdom was not received in humility as a gift from heaven, and so became a stumbling block to him." He was "one of those who, while casting longing eyes upon things not belonging to them, also lose the things they possess." Accordingly, Ahithophel was granted access by Almighty God into the Divine powers of God. And being thus familiar with Divine wisdom and knowledge as imparted through the Holy Spirit, he was consulted as an oracle like the Urim and Thummim. "..and great as was his wisdom, it was equalled by his scholarship. Therefore, David did not hesitate to submit himself to his instruction, even though Ahithophel was a young man at his death, not more than thirty-three years old. The one thing lacking in him was sincere piety, which proved his undoing in the end, for it induced him to participate in Absalom's rebellion against David. Thus, he forfeited even his share in the world to come.
To this dire course of action, he was misled by astrology and other signs, which he interpreted as prophecies of his kingship when in reality, they pointed to the royal destiny of his granddaughter Bath-sheba. Possessed by his erroneous belief, he cunningly urged Absalom to commit an unheard-of crime. Thus, Absalom would profit nothing by his rebellion, for, though he accomplished his father's ruin, he would yet be held to account and condemned to death for his violation of family purity, and the way to the throne would be clear for Ahithophel, the great sage in Israel."
The life and death of Absalom offered to the rabbis a welcome theme wherewith to warn the people against false ambition, vainglory, and unfilial conduct. The vanity with which he displayed his beautiful hair, the rabbis say, became his snare and his stumbling-block. "By his long hair the Nazirite entangled the people to rebel against his father, and by it he himself became entangled, to fall a victim to his pursuers". And again, elsewhere: "By his vile stratagem he deceived and stole three hearts, that of his father, of the elders, and finally of the whole nation of Israel, and for this reason three darts were thrust into his heart to end his treacherous life". More striking is the following: "Did one ever hear of an oak-tree having a heart? And yet in the oak-tree in whose branches Absalom was caught, we read that upon its heart he was held up still alive while the darts were thrust through him. This is to show that when a man becomes so heartless as to make war against his own father, nature itself takes on a heart to avenge the deed."
"The knowledge that a part of Absalom's following sided with him in secret,--that, though he was pursued by his son, his friends remained true to him,--somewhat consoled David in his distress. He thought that in these circumstances, if the worst came to the worst, Absalom would at least feel pity for him. At first, however, the despair of David knew no bounds. He was on the point of worshipping an idol, when his friend Hushai the Archite approached him, saying: "The people will wonder that such a king should serve idols." David replied: "Should a king such as I am be killed by his own son? It is better for me to serve idols than that God should be held responsible for my misfortune, and His Name thus be desecrated." Hushai reproached him: "Why didst thou marry a captive?" "There is no wrong in that," replied David, "it is permitted according to the law." Thereupon Hushai: "But thou didst disregard the connection between the passage permitting it and the one that follows almost immediately after it in the Scriptures, dealing with the disobedient and rebellious son, the natural issue of such a marriage." Absalom's end was beset with terrors. When he was caught in the branches of the oak-tree, he was about to sever his hair with a sword stroke, but suddenly he saw hell yawning beneath him, and he preferred to hang in the tree to throwing himself into the abyss alive. Absalom's crime was, indeed, of a nature to deserve the supreme torture, for which reason he is one of the few Jews who have no portion in the world to come.
Popular legend states that the eye of Absalom was of immense size, signifying his insatiable greed. Indeed, "hell itself opened beneath him, and David, his father, cried seven times: 'My son! my son!' while bewailing his death, praying at the same time for his redemption from the seventh section of Gehenna, to which he was consigned". According to R. Meir, "he has no share in the life to come". And according to the description of Gehenna by Joshua ben Levi, who, like Dante, wandered through hell under the guidance of the angel Duma, Absalom still dwells there, having the rebellious heathen in charge; and when the angels with their fiery rods run also against Absalom to smite him like the rest, a heavenly voice says: "Spare Absalom, the son of David, My servant." "That the extreme penalties of hell were thus averted from him, was on account of David's eightfold repetition of his son's name in his lament over him. Besides, David's intercession had the effect of re-attaching Absalom's severed head to his body. An account of Joshua Ben Levi going to the fifth compartment of Paradise reports: "The fifth compartment is of silver, and gold, and refined gold, and of crystal, and bdellium; and through its midst flows the river Gihon. The walls are of silver and gold, and a perfume breathes through it more exquisite than the perfume of Lebanon. And beds of silver and gold are there prepared, covered with violet and purple covers, woven by Eve, and mixed with scarlet and made of hair of goats, woven by angels. Here dwell the Messiah and Elijah in a palanquin of the wood of Lebanon; the pillars thereof of silver, the bottom thereof of gold, the seat of it of purple. Herein lieth the Messiah, the son of David, who is the love of the daughters of Jerusalem, the midst thereof is love. The prophet Elijah takes the head of the Messiah and places it in his bosom and says to him: "Be quiet and wait, for the end draweth nigh." On every Monday and Thursday and Saturday and Holiday the Patriarchs come to him and the fathers of the Tribes and Moses and Aaron and David and Solomon and every king of Israel and of the house of Judah, and they weep with him and comfort him, and say unto him: "Be quiet and wait and rely upon thy Creator, for the end draweth nigh." Also Korah and his company and Dathan and Abiram and Absalom come to him on every Wednesday, and ask him: "When will the end of our misery come? When wilt thou reveal thyself?"16. He answereth them and says: "Go to your fathers and ask them." And when they hear of their fathers they feel ashamed and do not ask any further. King David's prayers granted his rebellious son Avshalom access to the World to Come At his death Absalom was childless, for all his children, his three sons and his daughter, died before him, as a punishment for his having set fire to a field of grain belonging to Joab." Although Absalom avenged his sister's defilement by Amnon, ironically he proved himself to be little different from Amnon. As Amnon had sought the advice of Jonadab in order to rape Tamar, Absalom had sought the advice of Ahitophel who advised Absalom to have incestuous relations with his father's concubines in order to show all Israel how odious he was to his father [2 Samuel 16:20]. Likewise as Amnon had brought two curses on himself for incest with his half sister and failing to fulfill the Torah Law, Absalom brought four curses on himself for dishonoring his father; relations with his father's wives [concubines]; and failing to fulfill the Torah Law twice. [Deuteronomy 27:20 26] The Rabbis explain that the concubines were not punished by God. They were violated by Absalom. Absalom with his own free will, choose to do that. It is true God created a world where we humans can choose good or evil, but the choice in the end remains ours. Although God had told David that his wives would be taken, he did not ordain or force Absalom to violate them. He just foretold it. Is A lesson to be learned of the consequences from Absalom life is that his lust for power was so deep that he engaged in acts of chillul hashem and brought upon himself 4 curses from the Torah? (Dishonoring his father by his revolt; dishonoring his father's wives; and twice bring curses on himself for not fulfilling the Torah law)?Yes. He was a prince who could had almost anything. The only things he wanted were things he could not have. He lusted after his sister and his father's throne. Wealth is not determined by possessions but by mindset. In his mind, Absalom was a pauper. He only looked at what he did not have.
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Abydos, Egypt
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Abydos ( or ; Sahidic ') is one of the oldest cities of ancient Egypt, and also of the eighth nome in Upper Egypt. It is located about west of the Nile at latitude 26° 10' N, near the modern Egyptian towns of El Araba El Madfuna and El Balyana. In the ancient Egyptian language, the city was called Abedju"' ("ꜣbḏw" or "AbDw")(Arabic Abdu عبد-و).
The English name "Abydos" comes from the Greek , a name borrowed by Greek geographers from the unrelated city of Abydos on the Hellespont.
Considered one of the most important archaeological sites in Egypt, the sacred city of Abydos was the site of many ancient temples, including Umm el-Qa'ab, a royal necropolis where early pharaohs were entombed. These tombs began to be seen as extremely significant burials and in later times it became desirable to be buried in the area, leading to the growth of the town's importance as a cult site.
Today, Abydos is notable for the memorial temple of Seti I, which contains an inscription from the Nineteenth Dynasty known to the modern world as the Abydos King List. This is a chronological list showing cartouches of most dynastic pharaohs of Egypt from Menes until Seti I's father, Ramesses I. It is also notable for the Abydos graffiti, ancient Phoenician and Aramaic graffiti found on the walls of the Temple of Seti I.
The Great Temple and most of the ancient town are buried under the modern buildings to the north of the Seti temple. Many of the original structures and the artifacts within them are considered irretrievable and lost; many may have been destroyed by the new construction.
History.
Most of Upper Egypt became unified under rulers from Abydos during the Naqada III period (3200–3000 BCE), at the expense of rival cities such as Nekhen. The conflicts leading to the supremacy of Abydos may appear on numerous reliefs of the Naqada II period, such as the Gebel el-Arak Knife, or the frieze of Tomb 100 at Hierakonpolis.
Tombs and at least one temple of rulers of the Predynastic period have been found at Umm El Qa'ab including that of Narmer, dating to . The temple and town continued to be rebuilt at intervals down to the times of the Thirtieth Dynasty, and the cemetery was in continuous use.
The pharaohs of the First Dynasty were buried in Abydos, including Narmer, who is regarded as the founder of the First Dynasty, and his successor, Aha. It was in this time period that the Abydos boats were constructed. Some pharaohs of the Second Dynasty were also buried in Abydos. The temple was renewed and enlarged by these pharaohs as well. Funerary enclosures, misinterpreted in modern times as great 'forts', were built on the desert behind the town by three kings of the Second Dynasty; the most complete is that of Khasekhemwy, the Shunet El Zebib.
From the Fifth Dynasty, the deity Khentiamentiu, "foremost of the Westerners", came to be seen as a manifestation of the dead pharaoh in the underworld. Pepi I (Sixth Dynasty) constructed a funerary chapel which evolved over the years into the Great Temple of Osiris, the ruins of which still exist within the town enclosure. Abydos became the centre of the worship of the Isis and Osiris cult.
During the First Intermediate Period, the principal deity of the area, Khentiamentiu, began to be seen as an aspect of Osiris, and the deities gradually merged and came to be regarded as one. Khentiamentiu's name became an epithet of Osiris. King Mentuhotep II was the first to build a royal chapel. In the Twelfth Dynasty a gigantic tomb was cut into the rock by Senusret III. Associated with this tomb was a cenotaph, a cult temple and a small town known as "Wah-Sut", that was used by the workers for these structures. Next to the cenotaph at least two kings of the Thirteenth Dynasty were buried (in tombs S9 and S10) as well as some rulers of the Second Intermediate Period, such as Senebkay. An indigenous line of kings, the Abydos Dynasty, may have ruled the region from Abydos at the time.
New construction during the Eighteenth Dynasty began with a large chapel of Ahmose I. The Pyramid of Ahmose I was also constructed at Abydos—the only pyramid in the area; very little of it remains today.
Thutmose III built a far larger temple, about . He also made a processional way leading past the side of the temple to the cemetery beyond, featuring a great gateway of granite.
Seti I, during the Nineteenth Dynasty, founded a temple to the south of the town in honor of the ancestral pharaohs of the early dynasties; this was finished by Ramesses II, who also built a lesser temple of his own. Merneptah added the Osireion, just to the north of the temple of Seti.
Ahmose II in the Twenty-sixth Dynasty rebuilt the temple again, and placed in it a large monolith shrine of red granite, finely wrought. The foundations of the successive temples were comprised within approximately . depth of the ruins discovered in modern times; these needed the closest examination to discriminate the various buildings, and were recorded by more than 4,000 measurements and 1,000 levellings.
The last building added was a new temple of Nectanebo I, built in the Thirtieth Dynasty. From the Ptolemaic times of the Greek occupancy of Egypt, that began three hundred years before the Roman occupancy that followed, the structures began to decay and no later works are known.
Cult centre.
From earliest times, Abydos was a cult centre, first of the local deity, Khentiamentiu, and from the end of the Old Kingdom, the rising cult of Osiris. A tradition developed that the Early Dynastic cemetery was the burial place of Osiris and the tomb of Djer was reinterpreted as that of Osiris.
Decorations in tombs throughout Egypt, such as the one displayed to the right, record pilgrimages to Abydos by wealthy families.
Great Osiris Temple.
From the First Dynasty to the Twenty-sixth Dynasty, nine or ten temples were successively built on one site at Abydos. The first was an enclosure, about , enclosed by a thin wall of unbaked bricks. Incorporating one wall of this first structure, the second temple of about square was built with walls about thick. An outer "temenos" (enclosure) wall surrounded the grounds. This outer wall was made wider some time around the Second or Third Dynasty. The old temple entirely vanished in the Fourth Dynasty, and a smaller building was erected behind it, enclosing a wide hearth of black ashes. Pottery models of offerings are found in these ashes and were probably the substitutes for live sacrifices decreed by Khufu (or Cheops) in his temple reforms.
At an undetermined date, a great clearance of temple offerings had been made and the modern discovery of a chamber into which they were gathered yielded the fine ivory carvings and the glazed figures and tiles that demonstrate the splendid work of the First Dynasty. A vase of Menes with purple hieroglyphs inlaid into a green glaze and tiles with relief figures are the most important pieces found. The Khufu Statuette in ivory, found in the stone chamber of the temple, gives the only portrait of this great pharaoh.
The temple was entirely rebuilt on a larger scale by Pepi I in the Sixth Dynasty. He placed a great stone gateway to the "temenos", an outer wall and gateway, with a colonnade between the gates. His temple was about inside, with stone gateways front and back, showing that it was of the processional type. In the Eleventh Dynasty Mentuhotep II added a colonnade and altars. Soon after, Mentuhotep III entirely rebuilt the temple, laying a stone pavement over the area, about square. He also added subsidiary chambers. Soon thereafter, in the Twelfth Dynasty, Senusret I laid massive foundations of stone over the pavement of his predecessor. A great "temenos" was laid out enclosing a much larger area and the new temple itself was about three times the earlier size.
Brewery.
On 14 February 2021, Egyptian and American archaeologists discovered what could be the oldest brewery in the world dating from around 3100 BCE at the reign of King Narmer. Dr. Matthew Adams, one of the leaders of the mission, stated that it was used to make beer for royal rituals.
Main sites.
Seti I Temple.
The temple of Seti I was built on entirely new ground half a mile to the south of the long series of temples just described. This surviving building is best known as the Great Temple of Abydos, being nearly complete and an impressive sight. A principal purpose of the temple was to serve as a memorial to king Seti I, as well as to show reverence for the early pharaohs, which is incorporated within as part of the "Rite of the Ancestors".
The long list of the pharaohs of the principal dynasties—recognized by Seti—are carved on a wall and known as the "Abydos King List" (showing the cartouche name of many dynastic pharaohs of Egypt from the first, Narmer or Menes, until Seti's time). There were significant names deliberately left off of the list. So rare, as an almost complete list of pharaoh names, the Table of Abydos, rediscovered by William John Bankes, has been called the "Rosetta Stone" of Egyptian archaeology, analogous to the Rosetta Stone for Egyptian writing, beyond the Narmer Palette.
There were also seven chapels built for the worship of the pharaoh and principal deities. These included three chapels for the "state" deities Ptah, Re-Horakhty, and (centrally positioned) Amun and the challenge for the Abydos triad of Osiris, Isis and Horus. The rites recorded in the deity chapels represent the first complete form known of the Daily Ritual, which was performed daily in temples across Egypt throughout the pharaonic period. At the back of the temple is an enigmatic structure known as the Osireion, which served as a cenotaph for Seti-Osiris, and is thought to be connected with the worship of Osiris as an "Osiris tomb". It is possible that from those chambers was led out the great Hypogeum for the celebration of the Osiris mysteries, built by Merenptah. The temple was originally long, but the forecourts are scarcely recognizable, and the part still in good condition is about
long and wide, including the wing at the side. Magazines for food and offerings storage were built to either side of the forecourts, as well as a small palace for the king and his retinue, to the southeast of the first forecourt (Ghazouli, The Palace and Magazines Attached to the Temple of Sety I at Abydos and the Facade of This Temple. ASAE 58 (1959)).
Except for the list of pharaohs and a panegyric on Ramesses II, the subjects are not historical, but religious in nature, dedicated to the transformation of the king after his death. The temple reliefs are celebrated for their delicacy and artistic refinement, utilizing both the archaism of earlier dynasties with the vibrancy of late 18th Dynasty reliefs. The sculptures had been published mostly in hand copy, not facsimile, by Auguste Mariette in his "Abydos", I. The temple has been partially recorded epigraphically by Amice Calverley and Myrtle Broome in their 4 volume publication of "The Temple of King Sethos I at Abydos" (1933–1958).
King's List.
In The Gallery of Ancestors, also referred to as The Gallery of the List, one can find the Abydos King List. This list is depicted in low relief, carved under the reign of Seti I, and it shows Seti and Ramesses making offerings to their royal ancestors. These royal ancestors are the past kings of Egypt. Notably, some rulers, like the 15th Dynasty Hyksos that ruled Egypt during the Second Intermediate Period 1650-1550 BCE and the reign of the 18th Dynasty heretic Akhenaten of the New Kingdom 1550–1069, were omitted from the list, possibly due to being associated with periods of internal weakness and divisions. The Gallery of Ancestors led into the storerooms and the desert behind the temple.
Osireion.
The Osirion or Osireon, meaning "Menmaatre beneficial to Osiris" sometimes called the Osiris Complex, is an ancient Egyptian temple. It is located to the rear of the temple of Seti I. It is an integral part of Seti I's funeral complex and is built to resemble an 18th Dynasty Valley of the Kings tomb. This was possibly used in ritual purposes with the growing of barely that allowed for the symbolic representation of the resurrection of Osiris. Today parts of the Osierion contain water due to the Aswan Dam and rising floodwaters.
Helicopter hieroglyphs.
Some of the hieroglyphs carved over an arch on the site have been interpreted in esoteric and "ufological" circles as depicting modern technology, having been the subject of pyramidology.
The "helicopter" image is the result of carved stone being re-used over time. The initial carving was made during the reign of Seti I and translates to "He who repulses the nine [enemies of Egypt]". This carving was later filled in with plaster and re-carved during the reign of Ramesses II with the title "He who protects Egypt and overthrows the foreign countries". Over time, the plaster has eroded away, leaving both inscriptions partially visible and creating a palimpsest-like effect of overlapping hieroglyphs.
Ramesses II temple.
The adjacent temple of Ramesses II was much smaller and simpler in plan, but it had a fine historical series of scenes around the outside that lauded his achievements, of which the lower parts remain. The outside of the temple was decorated with scenes of the Battle of Kadesh. His list of pharaohs, similar to that of Seti I, formerly stood here; the fragments were removed by the French consul and sold to the British Museum.
King's List.
Inside the temple once stood another Gallery of Ancestors. This list is also depicted in low relief, carved under the reign of Ramesses II, but is more damaged. The surviving fragments were removed by the French consul in 1837 and sold to the British Museum.
Umm El Qa'ab.
The royal necropolises of the earliest dynasties were placed about a mile into the great desert plain, in a place now known as Umm El Qa'ab "The Mother of Pots" because of the shards remaining from all of the devotional objects left by religious pilgrims.
The earliest burial is about inside, a pit lined with brick walls and originally roofed with timber and matting. Other tombs also built before Menes are . The probable tomb of Menes is of the latter size. Afterwards, the tombs increased in size and complexity. The tomb-pit was surrounded by chambers to hold offerings, the sepulchre being a great wooden chamber in the midst of the brick-lined pit. Rows of small pits, tombs for the servants of the pharaoh, surrounded the royal chamber, many dozens of such burials being usual. Some of the offerings included sacrificed animals, such as the asses found in the tomb of Merneith. Evidence of human sacrifice exists in the early tombs, such as the 118 servants in the tomb of Merneith, but this practice was changed later into symbolic offerings.
By the end of the Second Dynasty the type of tomb constructed changed to a long passage with chambers on either side, the royal burial being in the middle of the length. The greatest of these tombs with its dependencies, covered a space of over , however it is possible for this to have been several tombs which abutted one another during construction; the Egyptians had no means of mapping the positioning of the tombs. The contents of the tombs have been nearly destroyed by successive plunderers; but enough remained to show that rich jewellery was placed on the mummies, a profusion of vases of hard and valuable stones from the royal table service stood about the body, the store-rooms were filled with great jars of wine, perfumed ointments, and other supplies, and tablets of ivory and of ebony were engraved with a record of the yearly annals of the reigns. The seals of various officials, of which over 200 varieties have been found, give an insight into the public arrangements.
A cemetery for private persons was put into use during the First Dynasty, with some pit-tombs in the town. It was extensive in the Twelfth and Thirteenth Dynasties and contained many rich tombs. A large number of fine tombs were made in the Eighteenth to Twentieth Dynasties, and members of later dynasties continued to bury their dead here until the Roman period. Many hundreds of funeral steles were removed by Auguste Mariette's workmen, without any details of the burials being noted. Later excavations have been recorded by Edward R. Ayrton, Abydos, iii.; MacIver, "El Amrah and Abydos"; and Garstang, "El Arabah".
"Forts".
Some of the tomb structures, referred to as "forts" by modern researchers, lay behind the town. Known as Shunet ez Zebib, it is about over all, and one still stands high. It was built by Khasekhemwy, the last pharaoh of the Second Dynasty. Another structure nearly as large adjoined it, and probably is older than that of Khasekhemwy. A third "fort" of a squarer form is now occupied by a convent of the Coptic Orthodox Church of Alexandria; its age cannot be ascertained.
Kom El Sultan.
The area now known as Kom El Sultan is a big mudbrick structure, the purpose of which is not clear and thought to have been at the original settlement area, dated to the Early Dynastic Period. The structure includes the early temple of Osiris.
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Abydos (Hellespont)
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Abydos (, ) was an ancient city and bishopric in Mysia. It was located at the Nara Burnu promontory on the Asian coast of the Hellespont (the straits of Dardanelles), opposite the ancient city of Sestos, and near the city of Çanakkale in Turkey. Abydos was founded in at the most narrow point in the straits, and thus was one of the main crossing points between Europe and Asia, until its replacement by the crossing between Lampsacus and Kallipolis in the 13th century, and the abandonment of Abydos in the early 14th century.
In Greek mythology, Abydos is presented in the myth of Hero and Leander as the home of Leander. The city is also mentioned in "Rodanthe and Dosikles", a novel written by Theodore Prodromos, a 12th-century writer, in which Dosikles kidnaps Rodanthe at Abydos.
Archaeology.
In 1675, the site of Abydos was first identified, and was subsequently visited by numerous classicists and travellers, such as Robert Wood, Richard Chandler, and Lord Byron. The city's acropolis is known in Turkish as Mal Tepe.
Following the city's abandonment, the ruins of Abydos were scavenged for building materials from the 14th to the 19th century, and remains of walls and buildings continued to be reported until at least the 19th century, however, little remains and the area was declared a restricted military zone in the early 20th century, thus little to no excavation has taken place.
History.
Classical period.
Abydos is mentioned in the "Iliad" as a Trojan ally, and, according to Strabo, was occupied by Bebryces and later Thracians after the Trojan War. It has been suggested that the city was originally a Phoenician colony as there was a temple of Aphrodite Porne (Aphrodite the Harlot) within Abydos. Abydos was settled by Milesian colonists contemporaneously with the foundation of the cities of Priapos and Prokonnesos in . Strabo related that Gyges, King of Lydia, granted his consent to the Milesians to settle Abydos; it is argued that this was carried out by Milesian mercenaries to act as a garrison to prevent Thracian raids into Asia Minor. The city became a thriving centre for tuna exportation as a result of the high yield of tuna in the Hellespont.
Abydos was ruled by Daphnis, a pro-Persian tyrant, in the 520s BC, but was occupied by the Persian Empire in 514. Darius I destroyed the city following his Scythian campaign in 512. Abydos participated in the Ionian Revolt in the early 5th century BC, however, the city returned briefly to Persian control as, in 480, at the onset of the Second Persian invasion of Greece, Xerxes I and the Persian army passed through Abydos on their march to Greece crossing the Hellespont on Xerxes' Pontoon Bridges. After the failed Persian invasion, Abydos became a member of the Athenian-led Delian League, and was part of the Hellespontine district. Ostensibly an ally, Abydos was hostile to Athens throughout this time, and contributed a "phoros" of 4-6 talents. Xenophon documented that Abydos possessed gold mines at Astyra or Kremaste at the time of his writing.
During the Second Peloponnesian War, a Spartan expedition led by Dercylidas arrived at Abydos in early May 411 BC and successfully convinced the city to defect from the Delian League and fight against Athens, at which time he was made harmost (commander/governor) of Abydos. A Spartan fleet was defeated by Athens at Abydos in the autumn of 411 BC. Abydos was attacked by the Athenians in the winter of 409/408 BC, but was repelled by a Persian force led by Pharnabazus, satrap (governor) of Hellespontine Phrygia. Dercylidas held the office of harmost of Abydos until at least . According to Aristotle, Abydos had an oligarchic constitution at this time. At the beginning of the Corinthian War in 394 BC, Agesilaus II, King of Sparta, passed through Abydos into Thrace. Abydos remained an ally of Sparta throughout the war and Dercylidas served as harmost of the city from 394 until he was replaced by Anaxibius in ; the latter was killed in an ambush near Abydos by the Athenian general Iphicrates in . At the conclusion of the Corinthian War, under the terms of the Peace of Antalcidas in 387 BC, Abydos was annexed to the Persian Empire. Within the Persian Empire, Abydos was administered as part of the satrapy of Hellespontine Phrygia, and was ruled by the tyrant Philiscus in 368. In , the city came under the control of the tyrant Iphiades.
Hellenistic period.
Abydos remained under Persian control until it was seized by a Macedonian army led by Parmenion, a general of Philip II, in the spring of 336 BC. In 335, whilst Parmenion besieged the city of Pitane, Abydos was besieged by a Persian army led by Memnon of Rhodes, forcing Parmenion to abandon his siege of Pitane and march north to relieve Abydos. Alexander ferried across from Sestos to Abydos in 334 and travelled south to the city of Troy, after which he returned to Abydos. The following day, Alexander left Abydos and led his army north to Percote. Alexander later established a royal mint at Abydos, as well as at other cities in Asia Minor.
After the death of Alexander the Great in 323 BC, Abydos, as part of the satrapy of Hellespontine Phrygia, came under the control of Leonnatus as a result of the Partition of Babylon. At the Partition of Triparadisus in 321 BC, Arrhidaeus succeeded Leonnatus as satrap of Hellespontine Phrygia.
In 302, during the Fourth War of the Diadochi, Lysimachus, King of Thrace, crossed over into Asia Minor and invaded the kingdom of Antigonus I. Unlike the neighbouring cities of Parium and Lampsacus which surrendered, Abydos resisted Lysimachus and was besieged. Lysimachus was forced to abandon the siege, however, after the arrival of a relief force sent by Demetrius, son of King Antigonus I. According to Polybius, by the third century BC, the neighbouring city of Arisbe had become subordinate to Abydos. The city of Dardanus also came under the control of Abydos at some point in the Hellenistic period. Abydos became part of the Seleucid Empire after 281 BC. The city was conquered by Ptolemy III Euergetes, King of Egypt, in 245 BC, and remained under Ptolemaic control until at least 241, as Abydos had become part of the Kingdom of Pergamon by c. 200 BC.
During the Second Macedonian War, Abydos was besieged by Philip V, King of Macedonia, in 200 BC, during which many of its citizens chose to commit suicide rather than surrender. Marcus Aemilius Lepidus met with Philip V during the siege to deliver an ultimatum on behalf of the Roman senate. Ultimately, the city was forced to surrender to Philip V due to a lack of reinforcements. The Macedonian occupation ended after the Peace of Flamininus at the end of the war in 196 BC. At this time, Abydos was substantially depopulated and partially ruined as a result of the Macedonian occupation.
In the spring of 196 BC, Abydos was seized by Antiochus III, "Megas Basileus" of the Seleucid Empire, who refortified the city in 192/191 BC. Antiochus III later withdrew from Abydos during the Roman-Seleucid War, thus allowing for the transportation of the Roman army into Asia Minor by October 190 BC. Dardanus was subsequently liberated from Abydene control, and the Treaty of Apamea of 188 BC returned Abydos to the Kingdom of Pergamon. A gymnasium was active at Abydos in the 2nd century BC.
Roman period.
Attalus III, King of Pergamon, bequeathed his kingdom to Rome upon his death in 133 BC, and thus Abydos became part of the province of Asia. The gold mines of Abydos at Astyra or Kremaste were near exhaustion at the time was Strabo was writing. The city was counted amongst the "telonia" (custom houses) of the province of Asia in the "lex portorii Asiae" of 62 AD, and formed part of the "conventus iuridicus Adramytteum". Abydos is mentioned in the "Tabula Peutingeriana" and Antonine Itinerary. The mint of Abydos ceased to function in the mid-3rd century AD.
It is believed that Abydos, with Sestos and Lampsacus, is referred to as one of the "three large capital cities" of the Roman Empire in "Weilüe", a 3rd-century AD Chinese text. The city was the centre for customs collection at the southern entrance of the Sea of Marmara, and was administered by a "komes ton Stenon" (count of the Straits) or an "archon" from the 3rd century to the 5th century AD.
Medieval period.
Pope Martin I rested at Abydos in the summer of 653 whilst en route to Constantinople. As a result of the administrative reforms of the 7th century, Abydos came to be administered as part of the theme of Opsikion. The office of "kommerkiarios" of Abydos is first attested in the mid-7th century, and was later sometimes combined with the office of "paraphylax", the military governor of the fort, introduced in the 8th century, at which time the office of "komes ton stenon" is last mentioned.
After the 7th century AD, Abydos became a major seaport. Maslama ibn Abd al-Malik, during his campaign against Constantinople, crossed over into Thrace at Abydos in July 717. The office of "archon" at Abydos was restored in the late 8th century and endured until the early 9th century. In 801, Empress Irene reduced commercial tariffs collected at Abydos. Emperor Nikephoros I, Irene's successor, introduced a tax on slaves purchased beyond the city. The city later also became part of the theme of the Aegean Sea and was the seat of a "tourmarches".
Abydos was sacked by an Arab fleet led by Leo of Tripoli in 904 AD whilst en route to Constantinople. The revolt of Bardas Phokas was defeated by Emperor Basil II at Abydos in 989 AD. In 992, the Venetians were granted reduced commercial tariffs at Abydos as a special privilege. In the early 11th century, Abydos became the seat of a separate command and the office of "strategos" (governor) of Abydos is first mentioned in 1004 with authority over the northern shore of the Hellespont and the islands of the Sea of Marmara.
In 1024, a Rus' raid led by a certain Chrysocheir defeated the local commander at Abydos and proceeded to travel south through the Hellespont. Following the Battle of Manzikert, Abydos was seized by the Seljuk Turks, but was recovered in 1086 AD, in which year Leo Kephalas was appointed "katepano" of Abydos. Abydos' population likely increased at this time as a result of the arrival of refugees from northwestern Anatolia who had fled the advance of the Turks. In 1092/1093, the city was attacked by Tzachas, a Turkish pirate. Emperor Manuel I Komnenos repaired Abydos' fortifications in the late 12th century.
By the 13th century AD, the crossing from Lampsacus to Kallipolis had become more common and largely replaced the crossing from Abydos to Sestos. During the Fourth Crusade, in 1204, the Venetians seized Abydos, and, following the Sack of Constantinople and the formation of the Latin Empire later that year, Emperor Baldwin granted the land between Abydos and Adramyttium to his brother Henry of Flanders. Henry of Flanders passed through Abydos on 11 November 1204 and continued his march to Adramyttium. Abydos was seized by the Empire of Nicaea, a successor state of the Eastern Roman Empire, during its offensive in 1206–1207, but was reconquered by the Latin Empire in 1212–1213. The city was later recovered by Emperor John III Vatatzes. Abydos declined in the 13th century, and was eventually abandoned between 1304 and 1310/1318 due to the threat of Turkish tribes and disintegration of Roman control over the region.
Ecclesiastical history.
The bishopric of Abydus appears in all the "Notitiae Episcopatuum" of the Patriarchate of Constantinople from the mid-7th century until the time of Andronikos III Palaiologos (1341), first as a suffragan of Cyzicus and then from 1084 as a metropolitan see without suffragans. The earliest bishop mentioned in extant documents is Marcian, who signed the joint letter of the bishops of Hellespontus to Emperor Leo I in 458, protesting about the murder of Proterius of Alexandria. A letter of Peter the Fuller (471–488) mentions a bishop of Abydus called Pamphilus. Ammonius signed the decretal letter of the Council of Constantinople in 518 against Severus of Antioch and others. Isidore was at the Third Council of Constantinople (680–681), John at the Trullan Council (692), Theodore at the Second Council of Nicaea (787). An unnamed bishop of Abydus was a counsellor of Emperor Nikephoros II in 969.
Seals attest Theodosius as bishop of Abydos in the 11th century, and John as metropolitan bishop of Abydos in the 11/12th century. Abydos remained a metropolitan see until the city fell to the Turks in the 14th century. The diocese is currently a titular see of the Patriarchate of Constantinople, and Gerasimos Papadopoulos was titular Bishop of Abydos from 1962 until his death in 1995. Simeon Kruzhkov was bishop of Abydos from May to September 1998. Kyrillos Katerelos was consecrated bishop of Abydos in 2008.
In 1222, during the Latin occupation, the papal legate Giovanni Colonna united the dioceses of Abydos and Madytos and placed the see under direct Papal authority. No longer a residential bishopric, Abydus is today listed by the Catholic Church as a titular see.
References.
Notes
Citations
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Acacia sensu lato
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Acacia s.l. (pronounced or ), known commonly as mimosa, acacia, thorntree or wattle, is a polyphyletic genus of shrubs and trees belonging to the subfamily Mimosoideae of the family Fabaceae. It was described by the Swedish botanist Carl Linnaeus in 1773 based on the African species "Acacia nilotica", now classified as "Vachellia nilotica". Many non-Australian species tend to be thorny. Most Australian acacias are not. All species are pod-bearing, with sap and leaves often bearing large amounts of tannins and condensed tannins that historically found use as pharmaceuticals and preservatives.
The genus "Acacia" constitutes, in its traditional circumspection, the second largest genus in Fabaceae ("Astragalus" being the largest), with roughly 1,300 species, about 960 of them native to Australia, with the remainder spread around the tropical to warm-temperate regions of both hemispheres, including Europe, Africa, southern Asia, and the Americas (see List of "Acacia" species). The genus was divided into five separate genera under "Mimosoideae". The genus now called "Acacia" represents the majority of the Australian species and a few native to Southeast Asia, Réunion, and the Pacific Islands. Most of the species outside Australia, and a small number of Australian species, are classified into "Vachellia" and "Senegalia". The two final genera, "Acaciella" and "Mariosousa", each contain about a dozen species from the Americas (but see "Classification" below for the ongoing debate concerning their taxonomy).
Classification.
English botanist and gardener Philip Miller adopted the name "Acacia" in 1754. The generic name is derived from (), the name given by early Greek botanist-physician Pedanius Dioscorides (middle to late first century) to the medicinal tree "A. nilotica" in his book "Materia Medica". This name derives from the Ancient Greek word for its characteristic thorns, (; "thorn"). The species name "nilotica" was given by Linnaeus from this tree's best-known range along the Nile river. This became the type species of the genus.
The traditional circumscription of "Acacia" eventually contained approximately 1,300 species. However, evidence began to accumulate that the genus as described was not monophyletic. Queensland botanist Leslie Pedley proposed the subgenus "Phyllodineae" be renamed "Racosperma" and published the binomial names. This was taken up in New Zealand but generally not followed in Australia, where botanists declared more study was needed.
Eventually , consensus emerged that "Acacia" needed to be split as it was not monophyletic. This led to Australian botanists Bruce Maslin and Tony Orchard pushing for the retypification of the genus with an Australian species instead of the original African type species, an exception to traditional rules of priority that required ratification by the International Botanical Congress. That decision has been controversial, and debate continued, with some taxonomists (and many other biologists) deciding to continue to use the traditional "Acacia sensu lato" circumscription of the genus, in defiance of decisions by an International Botanical Congress. However, a second International Botanical Congress has now confirmed the decision to apply the name "Acacia" to the mostly Australian plants, which some had been calling "Racosperma", and which had formed the overwhelming majority of "Acacia sensu lato". Debate continues regarding the traditional acacias of Africa, possibly placed in "Senegalia" and "Vachellia", and some of the American species, possibly placed in "Acaciella" and "Mariosousa".
Acacias belong to the subfamily Mimosoideae, the major clades of which may have formed in response to drying trends and fire regimes that accompanied increased seasonality during the late Oligocene to early Miocene (~25 mya). Pedley (1978), following Vassal (1972), viewed "Acacia" as comprising three large subgenera, but subsequently (1986) raised the rank of these groups to genera Acacia, "Senegalia" ("s.l.") and "Racosperma", which was underpinned by later genetic studies.
In common parlance, the term "acacia" is occasionally applied to species of the genus "Robinia", which also belongs in the pea family. "Robinia pseudoacacia", an American species locally known as black locust, is sometimes called "false acacia" in cultivation in the United Kingdom and throughout Europe.
Description.
The leaves of acacias are compound pinnate in general. In some species, however, more especially in the Australian and Pacific Islands species, the leaflets are suppressed, and the leaf-stalks (petioles) become vertically flattened in order to serve the purpose of leaves. These are known as "phyllodes". The vertical orientation of the phyllodes protects them from intense sunlight since with their edges towards the sky and earth they do not intercept light as fully as horizontally placed leaves. A few species (such as "Acacia glaucoptera") lack leaves or phyllodes altogether but instead possess cladodes, modified leaf-like photosynthetic stems functioning as leaves.
The small flowers have five very small petals, almost hidden by the long stamens, and are arranged in dense, globular or cylindrical clusters; they are yellow or cream-colored in most species, whitish in some, or even purple ("Acacia purpureopetala") or red ("Acacia leprosa" 'Scarlet Blaze'). "Acacia" flowers can be distinguished from those of a large related genus, "Albizia", by their stamens, which are not joined at the base. Also, unlike individual "Mimosa" flowers, those of "Acacia" have more than ten stamens.
The plants often bear spines, especially those species growing in arid regions. These sometimes represent branches that have become short, hard, and pungent, though they sometimes represent leaf-stipules. "Acacia armata" is the kangaroo-thorn of Australia, and "Acacia erioloba" (syn. "Acacia eriolobata") is the camelthorn of Africa.
Acacia seeds can be difficult to germinate. Research has found that immersing the seeds in various temperatures (usually around 80 °C (176 °F)) and manual seed coat chipping can improve growth to around 80%.
Symbiosis.
In the Central American bullthorn acacias—"Acacia sphaerocephala", "Acacia cornigera" and "Acacia collinsii" — some of the spiny stipules are large, swollen and hollow. These afford shelter for several species of "Pseudomyrmex" ants, which feed on extrafloral nectaries on the leaf-stalk and small lipid-rich food-bodies at the tips of the leaflets called Beltian bodies. In return, the ants add protection to the plant against herbivores. Some species of ants will also remove competing plants around the acacia, cutting off the offending plants' leaves with their jaws and ultimately killing them. Other associated ant species appear to do nothing to benefit their hosts.
Similar mutualisms with ants occur on "Acacia" trees in Africa, such as the whistling thorn acacia. The acacias provide shelter for ants in similar swollen stipules and nectar in extrafloral nectaries for their symbiotic ants, such as "Crematogaster mimosae". In turn, the ants protect the plant by attacking large mammalian herbivores and stem-boring beetles that damage the plant.
The predominantly herbivorous spider "Bagheera kiplingi", which is found in Central America and Mexico, feeds on nubs at the tips of the acacia leaves, known as Beltian bodies, which contain high concentrations of protein. These nubs are produced by the acacia as part of a symbiotic relationship with certain species of ant, which also eat them.
Pests.
In Australia, "Acacia" species are sometimes used as food plants by the larvae of hepialid moths of the genus "Aenetus" including "A. ligniveren". These burrow horizontally into the trunk then vertically down. Other Lepidoptera larvae which have been recorded feeding on "Acacia" include brown-tail, "Endoclita malabaricus" and turnip moth. The leaf-mining larvae of some bucculatricid moths also feed on "Acacia"; "Bucculatrix agilis" feeds exclusively on "Acacia horrida" and "Bucculatrix flexuosa" feeds exclusively on "Acacia nilotica".
Acacias contain a number of organic compounds that defend them from pests and grazing animals.
Uses.
Use as human food.
Acacia seeds are often used for food and a variety of other products.
In Myanmar, Laos, and Thailand, the feathery shoots of "Acacia pennata" (common name "cha-om", ชะอม and "su pout ywet" in Burmese) are used in soups, curries, omelettes, and stir-fries.
Gum.
Various species of acacia yield gum. True gum arabic is the product of "Acacia senegal", abundant in dry tropical West Africa from Senegal to northern Nigeria.
"Acacia nilotica" (syn. "Acacia arabica") is the gum arabic tree of India, but yields a gum inferior to the true gum arabic. Gum arabic is used in a wide variety of food products, including some soft drinks and confections.
The ancient Egyptians used acacia gum in paints.
The gum of "Acacia xanthophloea" and "Acacia karroo" has a high sugar content and is sought out by the lesser bushbaby. "Acacia karroo" gum was once used for making confectionery and traded under the name "Cape Gum". It was also used medicinally to treat cattle suffering poisoning by "Moraea" species.
Uses in folk medicine.
"Acacia" species have possible uses in folk medicine. A 19th-century Ethiopian medical text describes a potion made from an Ethiopian species (known as "grar") mixed with the root of the "tacha", then boiled, as a cure for rabies.
An astringent medicine high in tannins, called catechu or cutch, is procured from several species, but more especially from "Senegalia catechu" (syn. "Acacia catechu"), by boiling down the wood and evaporating the solution so as to get an extract. The catechu extract from "A. catechu" figures in the history of chemistry in giving its name to the catechin, catechol, and catecholamine chemical families ultimately derived from it.
Ornamental uses.
A few species are widely grown as ornamentals in gardens; the most popular perhaps is "A. dealbata" (silver wattle), with its attractive glaucous to silvery leaves and bright yellow flowers; it is erroneously known as "mimosa" in some areas where it is cultivated, through confusion with the related genus "Mimosa".
Another ornamental acacia is the fever tree. Southern European florists use "A. baileyana", "A. dealbata", "A. pycnantha" and "A. retinodes" as cut flowers and the common name there for them is mimosa.
Ornamental species of acacias are also used by homeowners and landscape architects for home security. The sharp thorns of some species are a deterrent to trespassing, and may prevent break-ins if planted under windows and near drainpipes. The aesthetic characteristics of acacia plants, in conjunction with their home security qualities, makes them a reasonable alternative to constructed fences and walls.
Perfume.
"Acacia farnesiana" is used in the perfume industry due to its strong fragrance. The use of acacia as a fragrance dates back centuries.
Symbolism and ritual.
Egyptian mythology has associated the acacia tree with characteristics of the tree of life, such as in the Myth of Osiris and Isis.
Several parts (mainly bark, root, and resin) of "Acacia" species are used to make incense for rituals. Acacia is used in incense mainly in India, Nepal, and China including in its Tibet region. Smoke from acacia bark is thought to keep demons and ghosts away and to put the gods in a good mood. Roots and resin from acacia are combined with rhododendron, acorus, cytisus, salvia, and some other components of incense. Both people and elephants like an alcoholic beverage made from acacia fruit.
According to Easton's Bible Dictionary, the acacia tree may be the "burning bush" (Exodus 3:2) which Moses encountered in the desert. Also, when God gave Moses the instructions for building the Tabernacle, he said to "make an ark" and "a table of acacia wood" (Exodus 25:10 & 23, Revised Standard Version). Also, in the Christian tradition, Christ's crown of thorns is thought to have been woven from acacia.
Acacia was used for Zulu warriors' iziQu (or isiKu) beads, which passed on through Robert Baden-Powell to the Scout movement's Wood Badge training award.
In Russia, Italy, and other countries, it is customary to present women with yellow mimosas (among other flowers) on International Women's Day (March 8). These "mimosas" may be from "A. dealbata" (silver wattle).
In 1918, May Gibbs, the popular Australian children's author, wrote the book 'Wattle Babies', in which a third-person narrator describes the lives of imaginary inhabitants of the Australian forests (the 'bush'). The main characters are the Wattle Babies, who are tiny people that look like acacia flowers and who interact with various forest creatures. Gibbs wrote "Wattle Babies are the sunshine of the Bush. In Winter, when the sky is grey and all the world seems cold, they put on their yellowest clothes and come out, for they have such cheerful hearts." Gibbs was referring to the fact that an abundance of acacias flower in August in Australia, in the midst of the southern hemisphere winter.
Tannin.
The bark of various Australian species, known as wattles, is very rich in tannin and forms an important article of export; important species include "A. pycnantha" (golden wattle), "A. decurrens" (tan wattle), "A. dealbata" (silver wattle) and "A. mearnsii" (black wattle).
Black wattle is grown in plantations in South Africa and South America. The pods of "A. nilotica" (under the name of "neb-neb"), and of other African species, are also rich in tannin and used by tanners. In Yemen, the principal tannin substance was derived from the leaves of the salam-tree ("Acacia etbaica"), a tree known locally by the name "qaraẓ" ("garadh"). A bath solution of the crushed leaves of this tree, into which raw leather had been inserted for prolonged soaking, would take only 15 days for curing. The water and leaves, however, required changing after seven or eight days, and the leather needed to be turned over daily.
Wood.
Some "Acacia" species are valuable as timber, such as "A. melanoxylon" (blackwood) from Australia, which attains a great size; its wood is used for furniture, and takes a high polish; and "A. omalophylla" (myall wood, also Australian), which yields a fragrant timber used for ornaments. "A. seyal" is thought to be the shittah-tree of the Bible, which supplied shittim-wood. According to the Book of Exodus, this was used in the construction of the Ark of the Covenant. "A. koa" from the Hawaiian Islands and "A. heterophylla" from Réunion are both excellent timber trees. Depending on abundance and regional culture, some "Acacia" species (e.g. "A. fumosa") are traditionally used locally as firewoods. It is also used to make homes for different animals.
Pulpwood.
In Indonesia (mainly in Sumatra) and in Malaysia (mainly in Sabah), plantations of "A. mangium" are being established to supply pulpwood to the paper industry.
Acacia wood pulp gives high opacity and below average bulk paper. This is suitable in lightweight offset papers used for Bibles and dictionaries. It is also used in paper tissue where it improves softness.
Land reclamation.
Acacias can be planted for erosion control, especially after mining or construction damage.
Ecological invasion.
For the same reasons it is favored as an erosion-control plant, with its easy spreading and resilience, some varieties of acacia are potentially invasive species. At least fourteen "Acacia" species introduced to South Africa are categorized as invasive, due to their naturally aggressive propagation. One of the most globally significant invasive acacias is black wattle "A. mearnsii", which is taking over grasslands and abandoned agricultural areas worldwide, especially in moderate coastal and island regions where mild climate promotes its spread. Australian/New Zealand Weed Risk Assessment gives it a "high risk, score of 15" rating and it is considered one of the world's 100 most invasive species.
Extensive ecological studies should be performed before further introduction of acacia varieties, as this fast-growing genus, once introduced, spreads quickly and is extremely difficult to eradicate.
Phytochemistry.
Cyanogenic glycosides.
Nineteen different species of "Acacia" in the Americas contain cyanogenic glycosides, which, if exposed to an enzyme which specifically splits glycosides, can release hydrogen cyanide (HCN) in the "leaves". This sometimes results in the poisoning death of livestock.
If fresh plant material spontaneously produces 200 ppm or more HCN, then it is potentially toxic. This corresponds to about 7.5 μmol HCN per gram of fresh plant material. It turns out that, if acacia "leaves" lack the specific glycoside-splitting enzyme, then they may be less toxic than otherwise, even those containing significant quantities of cyanic glycosides.
Some "Acacia" species containing cyanogens include "Acacia erioloba", "A. cunninghamii", "A. obtusifolia", "A. sieberiana", and "A. sieberiana" var. "woodii"
Famous acacias.
The Arbre du Ténéré in Niger was the most isolated tree in the world, about from any other tree. The tree was knocked down by a truck driver in 1973.
In Nairobi, Kenya, the Thorn Tree Café is named after a Naivasha thorn tree ("Acacia xanthophloea") in its centre. Travelers used to pin notes to others to the thorns of the tree. The current tree is the third of the same variety.
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Acapulco
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Acapulco de Juárez (), commonly called Acapulco ( , ; ), is a city and major seaport in the state of Guerrero on the Pacific Coast of Mexico, south of Mexico City. Located on a deep, semicircular bay, Acapulco has been a port since the early colonial period of Mexico's history. It is a port of call for shipping and cruise lines running between Panama and San Francisco, California, United States. The city of Acapulco is the largest in the state, far larger than the state capital Chilpancingo. Acapulco is also Mexico's largest beach and balneario resort city. Acapulco de Juárez, Guerrero is the municipal seat of the municipality of Acapulco, Guerrero.
The city is one of Mexico's oldest beach resorts, coming into prominence in the 1940s through the 1960s as a getaway for Hollywood stars and millionaires. Acapulco was once a popular tourist resort, but due to a massive upsurge in gang violence and homicide numbers since 2014, Acapulco no longer attracts many foreign tourists, and most now only come from within Mexico itself. It is both the ninth deadliest city in Mexico and the tenth-deadliest city in the world as of 2022; the US government has warned its citizens not to travel there. In 2016 there were 918 murders, and the homicide rate was one of the highest in the world: 103 in every 100,000. In September 2018, the city's entire police force was disarmed by the military, due to suspicions that it had been infiltrated by drug gangs.
The resort area is divided into three parts: the north end of the bay and beyond is the "traditional" area, which encompasses the area from "Parque Papagayo" through the and onto the beaches of "Caleta" and "Caletilla", the main part of the bay known as " ('golden zone' in Spanish), where the famous in the mid-20th century vacationed, and the south end, " ('diamond' in Spanish), which is dominated by newer luxury high-rise hotels and condominiums.
The name "Acapulco, Guerrero" comes from Nahuatl language "Aca-pōl-co", and means "where the reeds were destroyed or washed away" or "at the big reeds", which inspired the city's seal, which is an Aztec-type glyph showing two hands breaking reeds.
The "de Juárez" was added to the official name in 1885 to honor Benito Juárez, former president of Mexico (1806–1872). The island and municipality of Capul, in the Philippines, derives its name from Acapulco, Guerrero. Acapulco, Guerrero was the eastern end of the trans-Pacific sailing route from Acapulco to Manila, in what was then a Spanish colony.
History.
Pre-Columbian.
By the 8th century, around the Acapulco Bay area, there was a small culture which would first be dominated by the Olmecs, then by a number of others during the pre-Hispanic period before it ended in the 1520s. At Acapulco Bay itself, there were two Olmec sites, one by Playa Larga and the other on a hill known as "El Guitarrón". Olmec influence caused the small spread-out villages here to coalesce into larger entities and build ceremonial centers.
Later, Teotihuacan influence came to the area via Cuernavaca and Chilpancingo. Then Mayan influence arrived from the Isthmus of Tehuantepec and through what is now Oaxaca. This history is known through the archaeological artifacts that have been found here, especially at "Playa Hornos, Pie de la Cuesta", and "Tambuco".
In the 11th century, new waves of migration of Nahuas, including the "Coixcas", came through here. These people were the antecedents of the Aztecs. In the later 15th century, after four years of military struggle, Acapulco became part of the Aztec Empire during the reign of Ahuizotl (1486–1502). It was annexed to a tributary province named "Tepecuacuilco". However, this was only transitory, as the Aztecs could only establish an unorganized military post at the city's outskirts. The city was in territory under control of the "Yopis", who continued defending it and living there until the arrival of the Spanish in the 1520s.
16th century.
There are two stories about how Acapulco bay was discovered by Europeans. The first states that two years after the Spanish conquest of the Aztec Empire, Hernán Cortés sent explorers west to find gold. The explorers had subdued this area after 1523, and Captain Saavedra Cerón was authorized by Cortés to found a settlement here. The other states that the bay was discovered on December 13, 1526, by a small ship named the El Tepache Santiago captained by Santiago Guevara.
The first encomendero was established in 1525 at "Cacahuatepec", which is still part of the modern Acapulco municipality. In 1531, a number of Spaniards, most notably Juan Rodriguez de Villafuerte, left the Oaxaca coast and founded the village of Villafuerte where the city of Acapulco now stands. Villafuerte was unable to subdue the local native peoples, and this eventually resulted in the Yopa Rebellion in the region of "Cuautepec". Hernán Cortés was obligated to send Vasco Porcayo to negotiate with the indigenous people giving concessions. The province of Acapulco became the encomendero of Rodriguez de Villafuerte who received taxes in the form of cocoa, cotton and corn.
Cortés established Acapulco as a major port by the early 1530s, with the first major road between Mexico City and the port constructed by 1531. The wharf, named Marqués, was constructed by 1533 between Bruja Point and Diamond Point. Soon after, the area was made an "alcadia" (major province or town).
Spanish trade in the Far East would give Acapulco a prominent position in the economy of New Spain. In 1550, thirty Spanish families were sent to live here from Mexico City to have a permanent base of European residents. Galleons started arriving in Acapulco from Asia by 1565. Acapulco would become the second most important port, after Veracruz, due to its direct trade with the Philippines. This trade would focus on the yearly Manila-Acapulco Galleon trade, which was the nexus of all kinds of communications between New Spain, Europe and Asia. In 1573, the port was granted the monopoly of the Manila trade.
17th–19th centuries.
On January 25, 1614, a delegation led by samurai Hasekura Tsunenaga, which included over one hundred Japanese Christians as well as twenty-two samurai under the shōgun Tokugawa Ieyasu, arrived from Japan to Acapulco as part of a mission to form closer relations with Catholic Europe. A fight soon broke out in which a Japanese samurai stabbed a Spanish colonial soldier in Acapulco. This was witnessed and recorded by historian Chimalpahin, who was the grandson of an Aztec nobleman. Some of Tsunenaga's delegation would stay and marry with the locals.
The galleon trade made its yearly run from the mid-16th century until the early 19th. The luxury items it brought to New Spain attracted the attention of English and Dutch pirates, such as Francis Drake, Henry Morgan and Thomas Cavendish, who called it "The Black Ship". A Dutch fleet invaded Acapulco in 1615, destroying much of the town before being driven off. The Fort of San Diego was built the following year to protect the port and the cargo of arriving ships. The fort was destroyed by an earthquake in 1776 and was rebuilt between 1778 and 1783.
At the beginning of the 19th century, King Charles IV declared Acapulco a Ciudad Official and it became an essential part of the Spanish Crown. However, not long after, the Mexican War of Independence began. In 1810, José María Morelos y Pavón attacked and burnt down the city, after he defeated royalist commander Francisco Parés at the Battle of Tres Palos. The independence of Mexico in 1821 ended the run of the Manila Galleon. Acapulco's importance as a port recovered during the California Gold Rush in the mid-19th-century, with ships going to and coming from Panama stopping here. This city was besieged on 19 April 1854 by Antonio López de Santa Anna after Guerrero's leadership had rebelled by issuing the Plan de Ayutla. After an unsuccessful week of fighting, Santa Anna retreated.
20th century.
In 1911, revolutionary forces took over the main plaza of Acapulco. In 1920, the Prince of Wales (the future King Edward VIII) visited the area. Impressed by what he saw, he recommended the place to his compatriots in Europe, making it popular with the elite there. Much of the original hotel and trading infrastructure was built by a businessman named Albert B. Pullen from Corrigan, Texas, in the area now known as Old Acapulco. In 1933, Carlos Barnard started the first section of "Hotel El Mirador", with 12 rooms on the cliffs of La Quebrada. Albert Pullen built the "Las Americas Hotel". In the late 1930s, “La Fraccionadora de Acapulco, S.A.” (FASA), consisting of William Pullen, Anacleto Martínez, Juan M. Salcedo, and Wolf Schoenburg, who was especially instrumental, started tourism development in earnest.
In the mid-1940s, the first commercial wharf and warehouses were built. In the early 1950s, President Miguel Alemán Valdés upgraded the port's infrastructure, installing electrical lines, drainage systems, roads and the first highway to connect the port with Mexico City.
The economy grew and foreign investment increased with it. During the 1950s, Acapulco became the fashionable place for millionaire Hollywood stars such as Elizabeth Taylor, Frank Sinatra, Eddie Fisher and Brigitte Bardot. The 1963 Hollywood movie "Fun in Acapulco", starring Elvis Presley, is set in Acapulco although the filming took place in the United States. Former swing musician Teddy Stauffer, the so-called "Mister Acapulco", was a hotel manager ("Villa Vera", "Casablanca"), who attracted many celebrities to Acapulco.
From a population of only 4,000 or 5,000 in the 1940s, by the early 1960s, Acapulco had a population of about 50,000. In 1958, the Diocese of Acapulco was created by Pope Pius XII. It became an archdiocese in 1983.
During the 1960s and 1970s, new hotel resorts were built, and accommodation and transport were made cheaper. It was no longer necessary to be a millionaire to spend a holiday in Acapulco; the foreign and Mexican middle class could now afford to travel here. However, as more hotels were built in the south part of the bay, the old hotels of the 1950s lost their grandeur. For the 1968 Summer Olympics in neighboring Mexico City, Acapulco hosted the sailing (then yachting) events.
In the 1970s, there was a significant expansion of the port.
The Miss Universe 1978 pageant took place in the city. In 1983, singer-songwriter Juan Gabriel wrote the song "Amor eterno", which pays homage to Acapulco. The song was first and most famously recorded by Rocío Dúrcal. Additionally, Acapulco is the hometown of actress, singer, and comedian Aída Pierce, who found fame during the 1980s, 1990s and the first decade of the 21st century.
The tollway known as the "Ruta del Sol" was built during the 1990s, crossing the mountains between Mexico City and Acapulco. The journey takes only about three-and-a-half hours, making Acapulco a favorite weekend destination for Mexico City inhabitants. It was in that time period that the economic impact of Acapulco as a tourist destination increased positively, and as a result new types of services emerged, such as the Colegio Nautilus. This educational project, backed by the state government, was created for the families of local and foreign investors and businessmen living in Acapulco who were in need of a bilingual and international education for their children.
The port continued to grow and in 1996, a new private company, API Acapulco, was created to manage operations. This consolidated operations and now Acapulco is the major port for car exports to the Pacific.
The city was devastated by Hurricane Pauline in 1997. The storm stranded tourists and left more than 100 dead in the city. Most of the victims were from the shantytowns built on steep hillsides that surround the city. Other victims were swept away by thirty-foot (9 m) waves and winds. The main road, Avenida Costera, became a fast-moving river of sludge in depth.
21st century.
In the 21st century, the Mexican Drug War has had a negative effect on tourism in Acapulco as rival drug traffickers fight each other for the Guerrero coast route that brings drugs from South America as well as soldiers that have been fighting the cartels since 2006.
A major gun battle between 18 gunmen and soldiers took place in the summer of 2009 in the Old Acapulco seaside area, lasting hours and killing 16 of the gunmen and two soldiers. This came after the 2009 swine flu pandemic outbreak earlier in the year nearly paralyzed the Mexican economy, forcing hotels to give discounts to bring tourists back. However, hotel occupancy for 2009 was down five percent from the year before. The death of Arturo Beltrán Leyva in December 2009 resulted in infighting among different groups within the Beltrán Leyva cartel.
Gang violence continued to plague Acapulco through 2010 and into 2011, most notably with at least 15 dying in drug-related violence on March 13, 2010, and another 15 deaths on January 8, 2011. Among the first incident's dead were six members of the city police and the brother of an ex-mayor. In the second incident, the headless bodies of 15 young men were found dumped near the Plaza Sendero shopping center. On August 20, 2011, Mexican authorities reported that five headless bodies were found in Acapulco, three of which were placed in the city's main tourist area and two of which were cut into multiple pieces.
On February 4, 2013, six Spanish men were tied up and robbed and the six Spanish women with them were gang-raped by five masked gunmen who stormed a beach house on the outskirts of Acapulco, though after these accusations, none of the victims decided to press charges. On September 28, 2014, Mexican politician Braulio Zaragoza was gunned down at the "El Mirador" hotel in the city. He was the leader of the conservative opposition National Action Party (PAN) in southern Guerrero state. Several politicians have been targeted by drug cartels operating in the area. Investigations are under way, but no arrests have yet been made as of September 29. The insecurity due to individuals involved with drug cartels has cost the city of Acapulco its popularity among national and international tourists. It was stated by the "Dirección General de Aeronáutica Civil" that the number of international flyers coming to Acapulco decreased from 355,760 flyers registered in 2006 to 52,684 flyers in the year 2015, the number of international tourists flying to Acapulco dropped 85% in the interval of nine years. In 2018, the Mexican Armed Forces entered the city, placing it under occupation. The police department was disarmed after allegations of the latter being linked to the cartels.
Hurricane Otis.
On October 25, 2023, Hurricane Otis, a Category 5 hurricane with 1-minute sustained winds of , caused widespread devastation throughout the city while making landfall nearby.
Hurricane John.
Hurricane John struck Acapulco and Mexico's Pacific coast in late September 2024 as a Category 3 hurricane, delivering powerful winds and extreme rainfall that led to widespread flooding and significant damage. Acapulco experienced nearly one meter of rainfall, resulting in submerged neighborhoods and serious disruptions. Roads became impassable due to landslides, and extensive power outages left tens of thousands without electricity across Guerrero and Oaxaca. Around 40,000 homes were damaged impacting over 150,000 residents.
Geography.
The city, located on the Pacific coast of Mexico in the state of Guerrero, is classified as one of the state's seven regions, dividing the rest of the Guerrero coast into the Costa Grande and the Costa Chica. Forty percent of the municipality is mountainous terrain; another forty percent is semi-flat; and the other twenty percent is flat. Elevation varies from sea level to . The highest peaks are "Potrero, San Nicolas", and "Alto Camarón". One major river runs through the municipality, the "Papagayo", along with a number of "arroyos" (streams). There are also two small lagoons, Tres Palos and Coyuca, along with a number of thermal springs.
Climate.
Acapulco features a tropical wet and dry climate (Köppen: Aw): hot with distinct wet and dry seasons, with more even temperatures between seasons than resorts farther north in Mexico, but this varies depending on altitude. The warmest areas are next to the sea where the city is. Pacific hurricanes and tropical storms are threats from May through November; notably, the city was struck directly by Category 5 Hurricane Otis on October 25, 2023, which caused extensive damage. The forested area tends to lose leaves during the winter dry season, with evergreen pines in the highest elevations. Fauna consists mostly of deer, small mammals, a wide variety of both land and seabirds, and marine animals such as turtles. Oddly enough, January, its coolest month, also features its all-time record high.
The temperature of the sea is quite stable, with lows of between January – March, and a high of in August. These sea surface temperatures are much warmer than those further north along the Pacific coast, and indeed warmer than most places further south, as sea surface temperatures begin to decline with proximity to the Southern Hemisphere's Humboldt Current.
Government.
As the seat of a municipality, the city of Acapulco is the government authority for over 700 other communities, which together have a territory of 1,880.60 km2. This municipality borders the municipalities of Chilpancingo, Juan R Escudero (Tierra Colorada), San Marcos, Coyuca de Benítez with the Pacific Ocean to the south.
The metropolitan area is made up of the municipalities of Acapulco de Juárez and Coyuca de Benitez. The area has a population () of 786,830.
For the names and terms of some Acapulco mayors, you can check a List of municipal presidents of Acapulco.
Demographics.
Population.
Acapulco is the most populated city in the state of Guerrero, according to the results of the II Population and Housing Census 2010 carried out by the National Institute of Statistics and Geography (INEGI) with a census date of June 12, 2010, The city had until then a total population of 673,479 inhabitants, of that amount, 324,746 were men and 348,733 women. It is considered the twenty-second most populous city in Mexico and the tenth most populous metropolitan area in Mexico. It is also the city with the highest concentration of population of the homonymous municipality, representing 85.25 percent of the 789,971 inhabitants. In the 2020 census of 658,609 people where counted in the locality and 779,566 in the municipality of Acapulco, a small drop from the last census.
The metropolitan area of Acapulco is made up of six towns in the municipality of Acapulco de Juárez and four in the municipality of Coyuca de Benítez. In agreement with the last count and official delimitation realized in 2010 altogether by the National Institute of Statistics and Geography, the National Council of Population and the Secretariat of Social Development, the metropolitan area of Acapulco grouped a total of 863,431 inhabitants in a surface of 3,538.5 km2, which placed it as the tenth most populated district in Mexico.
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Economy.
Tourism is the main economic activity of the municipality and most of this is centered on Acapulco Bay. About seventy-three percent of the municipality's population is involved in commerce, most of it related to tourism and the port. Mining and manufacturing employ less than twenty percent and only about five percent is dedicated to agriculture. Industrial production is limited mostly to bottling, milk products, cement products, and ice and energy production. Agricultural products include tomatoes, corn, watermelon, beans, green chili peppers, and melons.
Tourism.
Acapulco is one of Mexico's oldest coastal tourist destinations, reaching prominence in the 1950s as the place where Hollywood stars and millionaires vacationed on the beach in an exotic locale. In modern times, tourists in Acapulco have been facing problems with corrupt local police who steal money by extortion and intimidate visitors with threats of jail.
The city is divided into three tourist areas.
Traditional Acapulco is the old part of the port, where hotels like Hotel Los Flamingos, owned by personalities Johnny Weissmuller and John Wayne are located, is on the northern end of the bay. Anchored by attractions such as the beaches of Caleta and Caletilla, the cliff divers of La Quebrada, and the city square, known as "El Zocalo". The heyday of this part of Acapulco ran from the late 1930s until the 1960s, with development continuing through the 1980s. This older section of town now caters to a mostly middle-class, almost exclusively Mexican clientele, while the glitzier newer section caters to the Mexican upper classes, many of whom never venture into the older, traditional part of town.
Acapulco Dorado had its development between the 1950s and the 1970s, and is about 25 minutes from the Acapulco International Airport. It is the area that presents the most tourist influx in the port, runs through much of the Acapulco bay, from Icacos, passing through Costera Miguel Aleman Avenue, which is the main one, to Papagayo Park. It has several hotels,
Acapulco Diamante, also known as Punta Diamante, is the newest and most developed part of the port, with investment having created one of the greatest concentrations of luxury facilities in Mexico, including exclusive hotels and resorts of international chains, residential complexes, luxury condominiums and private villas, spas, restaurants, shopping areas and a golf course. Starting at the Scenic Highway in Las Brisas, it includes Puerto Marqués and Punta Diamante and extends to Barra Vieja Beach. It is 10 minutes from the Acapulco International Airport. In this area, all along "Boulevard de las Naciones", almost all transportation is by car, limousine or golf cart.
Acapulco's reputation of a high-energy party town and the nightlife have long been draws of the city for tourists. From November to April, luxury liners stop here daily and include ships such as the , the , "Crystal Harmony", and all the Princess line ships. Despite Acapulco's international fame, most of its visitors are from central Mexico, especially the affluent from Mexico City. Acapulco is one of the embarkation ports for the Mexican cruise line Ocean Star Cruises.
For the Christmas season of 2009, Acapulco received 470,000 visitors, most of whom are Mexican nationals, adding 785 million pesos to the economy. Eighty percent arrive by land and eighteen percent by air. The area has over 25,000 condominiums, most of which function as second homes for their Mexican owners. Acapulco is still popular with Mexican celebrities and the wealthy, such as Luis Miguel and Plácido Domingo, who maintain homes there.
Problems.
From the latter 20th century on, the city has also taken on other less-positive reputations. Some consider it a "passé" resort, eclipsed by the newer Cancún and Cabo San Lucas. Over the years, a number of problems have developed here, especially in the bay and the older sections of the city. The large number of wandering vendors on the beaches, who offer everything from newspapers to massages, are a recognized problem. It is a bother to tourists who simply want to relax on the beach, but the government says it is difficult to eradicate, as there is a lot of unemployment and poverty in the city. Around the city are many small shantytowns that cling to the mountainsides, populated by migrants who have come to the city looking for work. In the last decade, drug-related violence has caused massive problems for the local tourism trade.
Another problem is the garbage that has accumulated in the bay. Although 60.65 tons have recently been extracted from the bays of Acapulco and nearby Zihuatanejo, more needs to be done. Most of trash removal during the off seasons is done on the beaches and in the waters closest to them. However, the center of the bay is not touched. The reason trash winds up in the bay is that it is common in the city to throw it in streets, rivers and the bay itself. The most common items cleaned out of the bay are beer bottles and car tires. Acapulco has seen some success in this area, having several beaches receiving the high "blue flag" certifications for cleanliness and water quality.
Cuisine.
Acapulco's cuisine is very rich. The following are typical dishes from the region: Relleno is baked pork with a variety of vegetables and fruits such as potatoes, raisins, carrots and chiles. It is eaten with bread called "bolillo". Pozole is a soup with a salsa base (it can be white, red or green), hominy, meat that can be either pork or chicken and it is accompanied with "antojitos" (snacks) like tostadas, tacos and tamales. This dish is served as part of a weekly Thursday event in the city and the state, with many restaurants offering the meal with special entertainment, from bands to dancers to celebrity impersonators.
Attractions.
Acapulco's main attraction is its nightlife, as it has been for many decades. Nightclubs change names and owners frequently.
For example, Baby 'O has been open to the national and international public since 1976 and different celebrities have visited their installations such as Mexican singer Luis Miguel, Bono from U2 and Sylvester Stallone. Another nightclub is Palladium, located in the Escénica Avenue, the location gives the nightclub a view of the Santa Lucia Bay at night. Various DJs have had performances in Palladium among them DVBBS, Tom Swoon, Nervo and Junkie KID.
Informal lobby or poolside cocktail bars often offer free live entertainment. In addition, there is the beach bar zone, where younger crowds go. These are located along the Costera road, face the ocean and feature techno or alternative rock. Most are concentrated between the Fiesta Americana and Continental Plaza hotels. These places tend to open earlier and have more informal dress. There is a bungee jump in this area as well.
Another attraction at Acapulco is the La Quebrada Cliff Divers. The tradition started in the 1930s when young men casually competed against each other to see who could dive from the highest point into the sea below. Eventually, locals began to ask for tips for those coming to see the men dive. Today the divers are professionals, diving from heights of into an inlet that is only wide and deep, after praying first at a shrine to the Virgin of Guadalupe. On the evening before December 12, the feast day of this Virgin, freestyle cliff divers jump into the sea to honor her. Dives range from the simple to the complicated and end with the "Ocean of Fire" when the sea is lit with gasoline, making a circle of flames which the diver aims for. The spectacle can be seen from a public area which charges a small fee or from the Hotel Plaza Las Glorias/El Mirador from its bar or restaurant terrace.
There are a number of beaches in the Acapulco Bay and the immediate coastline. In the bay proper there are the La Angosta (in the Quebrada), Caleta, Caletilla, Dominguillo, Tlacopanocha, Hornos, Hornitos, Honda, Tamarindo, Condesa, Guitarrón, Icacos, Playuela, Playuelilla and Playa del Secreto. In the adjoining, smaller Bay of Puerto Marqués there is Pichilingue, Las Brisas, and Playa Roqueta. Facing open ocean just northwest of the bays is Pie de la Cuesta and southeast are Playa Revolcadero, Playa Aeromar, Playa Encantada and Barra Vieja. Two lagoons are in the area, Coyuca to the northwest of Acapulco Bay and Tres Palos to the southeast. Both lagoons have mangroves and offer boat tours. Tres Palos also has sea turtle nesting areas which are protected.
In addition to sunbathing, the beaches around the bay offer a number of services, such as boat rentals, boat tours, horseback riding, scuba diving and other aquatic sports. One popular cruise is from Caletilla Beach to Roqueta Island, which has places to snorkel, have lunch, and a lighthouse. There is also an underwater statue of the Virgin of Guadalupe here, created in 1958 by Armando Quesado in memory of a group of divers who died here. Many of the scuba-diving tours come to this area as well, where there are sunken ships, sea mountains, and cave rock formations. Another popular activity is deep-sea fishing. The major attraction is sail fishing. Fish caught here have weighed between 89 and 200 pounds. Sailfish are so plentiful that boat captains have been known to bet with a potential customer that if he does not catch anything, the trip is free.
In the old part of the city, there is a traditional main square called the Zócalo, lined with shade trees, cafés and shops. At the north end of the square is "Nuestra Señora de la Soledad" cathedral, with blue onion-shaped domes and Byzantine towers. The building was originally constructed as a movie set, but was later adapted into a church. Acapulco's most historic building is the Fort of San Diego, located east of the main square and originally built in 1616 to protect the city from pirate attacks. The fort was built by a Dutch engineer and finished in 1617 then destroyed in 1776 by an earthquake. It was rebuilt by 1783 and this is the building that can be seen today, unchanged except for renovations done to it in 2000. Parts of the moats remain as well as the five bulwarks and the battlements. Today the fort serves as the Museo Histórico de Acapulco (Acapulco Historical Museum), which shows the port's history from the pre-Hispanic period until independence. There are temporary exhibits as well. For many years tourists could ride around the city in colorful horse-drawn carriages known as "calandrias", but the practice ended in February 2020 due to concerns about mistreatment of the animals.
The El Rollo Acapulco is a sea-life and aquatic park located on Costera Miguel Aleman. It offers wave pools, water slides and water toboggans. There are also dolphin shows daily and a swim with dolphins program. The center mostly caters to children. Another place that is popular with children is the "Parque Papagayo": a large family park which has a life-sized replica of a Spanish galleon, three artificial lakes, an aviary, a skating rink, rides, go-karts and more.
The Dolores Olmedo House is located in the traditional downtown of Acapulco and is noted for the murals by Diego Rivera that adorn it. Olmedo and Rivera had been friend since Olmedo was a child and Rivera spent the last two years of his life here. During that time, he painted nearly nonstop and created the outside walls with tile mosaics, featuring Aztec deities such as Quetzalcoatl. The interior of the home is covered in murals. The home is not a museum, so only the outside murals can be seen by the public.
There is a small museum called "Casa de la Máscara" (House of Masks) which is dedicated to masks, most of them from Mexico, but there are examples from many parts of the world. The collection contains about one thousand examples and is divided into seven rooms called Masks of the World, Mexico across History, The Huichols and the Jaguar, Alebrijes, Dances of Guerrero, Devils and Death, Identity and Fantasy, and Afro-Indian masks.
The Botanical Garden of Acapulco is a tropical garden located on lands owned by the Universidad Loyola del Pacífico. Most of the plants here are native to the region, and many, such as the Peltogyne mexicana or purple stick tree, are in danger of extinction.
One cultural event that is held yearly in Acapulco is the "Festival Internacional de la Nao", which takes place in the Fort of San Diego, located near the Zócalo in downtown of the city. The Festival honors the remembrance of the city's interaction and trades with Oriental territories which started back in the Sixteenth Century. The Nao Festival consists of cultural activities with the support of organizations and embassies from India, China, Japan, Philippines, Thailand, Indonesia and South Korea. The variety of events go from film projections, musical interpretations and theatre to gastronomical classes, some of the events are specifically for kids.
The annual French Festival takes place throughout Acapulco city and offers a multitude of events that cement cultural links between Mexico and France. The main features are a fashion show and a gourmet food fair. The Cinépolis Galerías Diana and the Teatro Juan Ruíz de Alarcón present French and French literary figures who give talks on their specialised subjects. Even some of the local nightclubs feature French DJs. Other festivals celebrated here include Carnival, the feast of San Isidro Labrador on 15 May, and in November, a crafts and livestock fair called the Nao de China.
There are a number of golf courses in Acapulco including the Acapulco Princess and the Pierre Marqués course, the latter designed by Robert Trent Jones in 1972 for the World Cup Golf Tournament. The Mayan Palace course was designed by Pedro Guericia and an economical course called the Club de Golf Acapulco is near the convention center. The most exclusive course is that of the Tres Vidas Golf Club, designed by Robert von Hagge. It is located next to the ocean and is home to flocks of ducks and other birds.
Another famous sport tournament that has been held in Acapulco since 1993 is the Mexican Open tennis tournament, an ATP 500 event that currently takes place at the Arena GNP Seguros. Initially it was played in clay courts but it changed to hard court. The event has gained popularity within the passing of the years, attracting some of the top tennis players in the world including Novak Djokovic, Rafael Nadal and Marin Cilic. The total prize money is US$250,000.00 for WTA (women) and US$1,200,000.00 for ATP (men).
Acapulco also has a bullring, called the Plaza de Toros, near Caletilla Beach. The season runs during the winter and is called the Fiesta Brava.
Spring break.
Before 2010, over 100,000 American teenagers and young adults traveled to resort areas and balnearios throughout Mexico during spring break each year. The main reason students head to Mexico is the drinking age of 18 years (versus 21 for the United States), something that has been marketed by tour operators along with the sun and ocean. This has become attractive since the 1990s, especially since more traditional spring break places such as Daytona Beach, Florida, have enacted restrictions on drinking and other behaviors. This legislation has pushed spring break tourism to various parts of Mexico, with Acapulco as one of the top destinations.
In the late 1990s and early 2000s, Cancún had been favored as the spring break destination of choice. However, Cancún has taken some steps to control the reckless behavior associated with the event, and students have been looking for someplace new. This led many more to choose Acapulco, in spite of the fact that for many travelers, the flight is longer and more expensive than to Cancún. Many were attracted by the glitzy hotels on the south side and Acapulco's famous nightlife. In 2008, 22,500 students came to Acapulco for spring break. Hotels did not get that many in 2009, due mostly to the economic situation in the United States, and partially because of scares of drug-related violence.
In February 2009, the US State Department issued a travel alert directed at college students planning spring break trips to Acapulco. The warning—a result of violent activity springing from Mexico's drug cartel débâcle—took college campuses by storm, with some schools going so far as to warn their students about the risks of travel to Mexico over spring break. Bill O'Reilly devoted a segment of his show, "The O'Reilly Factor", to urge students to stay away from Acapulco. In June 2009, a number of incidents occurred between the drug cartel and the government. These included coordinated attacks on police headquarters and open battles in the streets, involving large-caliber weapons and grenades. However, no incidents of violence against travelers on spring break were reported.
Transportation.
Nine passenger airlines, including four international ones, fly to Acapulco International Airport. In the city, there are many buses and taxi services one can take to get from place to place, but most of the locals choose to walk to their destinations. However, an important mode of transportation is the government-subsidized 'Colectivo' cab system. These cabs cost 13 pesos per person to ride, but they are not private. The driver will pick up more passengers as long as seats are available, and will transport them to their destination based on first-come, first-served rules. The colectivos each travel a designated area of the city, the three main ones being Costera, Colosio, Coloso, or a mixture of the three. Coloso cabs travel mainly to old Acapulco. Colosio cabs travel through most of the tourist area of Acapulco. Costera cabs drive up and down the coast of Acapulco, where most of the hotels for visitors are located, but which includes some of old Acapulco. Drivers have discretion over destinations; some are willing to travel to the other designated areas, especially during slow periods of the day.
The bus system is highly complex and can be rather confusing to an outsider. As far as transportation goes, it is the cheapest form, other than walking, in Acapulco. The most expensive buses have air conditioning, while the cheaper buses do not. For tourists, the Acapulco city government has established a system of yellow buses with Acapulco painted on the side of them. These buses are not for tourists only, but are certainly the nicest and most uniform of the bus systems. These buses travel the tourist section of Acapulco, driving up and down the coast. There are buses with specific routes and destinations, generally written on their windshields or shouted out by a barker riding in the front seat. Perhaps the most unusual thing about the privately operated buses is the fact that they are all highly decorated and personalized, with decals and home-made interior designs that range from comic book scenes, to pornography, and even to "Hello Kitty" themes.
The bus network was simplified on 25 June 2016 with the implementation of the . The bus rapid transit system spans , with 16 stations spread throughout the city of Acapulco along five routes. Boarding is sped by pre- payment at stations.
UNESCO World Heritage Site nominations.
In 2014, the idea to nominate the Manila-Acapulco Galleon Trade Route was initiated by the Mexican ambassador to UNESCO with the Filipino ambassador to UNESCO.
An Experts' Roundtable Meeting was held at the University of Santo Tomas (UST) on April 23, 2015, as part of the preparation of the Philippines for the possible transnational nomination of the Manila-Acapulco Galleon Trade Route to the World Heritage List. The nomination will be made jointly with Mexico.
The following are the experts and the topics they discussed during the roundtable meeting: Dr. Celestina Boncan on the Tornaviaje; Dr. Mary Jane A. Bolunia on Shipyards in the Bicol Region; Mr. Sheldon Clyde Jago-on, Bobby Orillaneda, and Ligaya Lacsina on Underwater Archaeology; Dr. Leovino Garcia on Maps and Cartography; Fr. Rene Javellana, S.J. on Fortifications in the Philippines; Felice Sta. Maria on Food; Dr. Fernando Zialcita on Textile; and Regalado Trota Jose on Historical Dimension. The papers presented and discussed during the roundtable meeting will be synthesized into a working document to establish the route's Outstanding Universal Value.
The Mexican side reiterated that they will also follow suit with the preparations for the route's nomination.
Spain has also backed the nomination of the Manila-Acapulco Trade Route in the UNESCO World Heritage Site list and has also suggested the Archives of the Manila-Acapulco Galleons to be nominated as part of a separate UNESCO list, the UNESCO Memory of the World Register.
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Alan Kay
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Alan Curtis Kay (born May 17, 1940) is an American computer scientist who pioneered work on object-oriented programming and windowing graphical user interface (GUI) design. At Xerox PARC he led the design and development of the first modern windowed computer desktop interface. There he also led the development of the influential object-oriented programming language Smalltalk, both personally designing most of the early versions of the language and coining the term "object-oriented."
He has been elected a Fellow of the American Academy of Arts and Sciences, the National Academy of Engineering, and the Royal Society of Arts. He received the Turing Award in 2003.
Early life and work.
In an interview on education in America with the Davis Group Ltd., Kay said:
Originally from Springfield, Massachusetts, Kay's family relocated several times due to his father's career in physiology before ultimately settling in the New York metropolitan area.
He attended Brooklyn Technical High School. Having accumulated enough credits to graduate, he then attended Bethany College in Bethany, West Virginia, where he majored in biology and minored in mathematics.
Kay then taught guitar in Denver, Colorado for a year. He was drafted in the United States Army, then qualified for officer training in the United States Air Force, where he became a computer programmer after passing an aptitude test.
After his discharge, he enrolled at the University of Colorado Boulder and earned a Bachelor of Science (B.S.) in mathematics and molecular biology in 1966.
In the autumn of 1966, he began graduate school at the University of Utah College of Engineering. He earned a Master of Science in electrical engineering in 1968, then a Doctor of Philosophy in computer science in 1969. His doctoral dissertation, "FLEX: A Flexible Extendable Language", described the invention of a computer language named FLEX. While there, he worked with "fathers of computer graphics" David C. Evans (who had recently been recruited from the University of California, Berkeley to start Utah's computer science department) and Ivan Sutherland (best known for writing such pioneering programs as Sketchpad). Kay credits Sutherland's 1963 thesis for influencing his views on objects and computer programming. As he grew busier with research for the Defense Advanced Research Projects Agency (DARPA), he ended his musical career.
In 1968, he met Seymour Papert and learned of the programming language Logo, a dialect of Lisp optimized for educational purposes. This led him to learn of the work of Jean Piaget, Jerome Bruner, Lev Vygotsky, and of constructionist learning, further influencing his professional orientation. On December 9 of that same year he was present in San Francisco for the Mother of all Demos, a landmark computer demonstration by Douglas Engelbart. Even though he was sick with a high fever on that day, the event was very influential in Kay's career. He recalled later: "It was one of the greatest experiences in my life".
In 1969, Kay became a visiting researcher at the Stanford Artificial Intelligence Laboratory in anticipation of accepting a professorship at Carnegie Mellon University. Instead, in 1970, he joined the Xerox PARC research staff in Palo Alto, California. Through the decade, he developed prototypes of networked workstations using the programming language Smalltalk.
Along with some colleagues at PARC, Kay is one of the fathers of the idea of object-oriented programming (OOP), which he named. Some original object-oriented concepts, including the use of the words 'object' and 'class', had been developed for Simula 67 at the Norwegian Computing Center. Kay said:
I'm sorry that I long ago coined the term "objects" for this topic because it gets many people to focus on the lesser idea. The big idea is "messaging".
While at PARC, Kay conceived the Dynabook concept, a key progenitor of laptop and tablet computers and the e-book. He is also the architect of the modern overlapping windowing graphical user interface (GUI). Because the Dynabook was conceived as an educational platform, he is considered one of the first researchers into mobile learning; many features of the Dynabook concept have been adopted in the design of the One Laptop Per Child educational platform, with which Kay is actively involved.
Subsequent work.
From 1981 to 1984, Kay was Chief Scientist at Atari. In 1984, he became an Apple Fellow. After the closure of the Apple Advanced Technology Group in 1997, he was recruited by his friend Bran Ferren, head of research and development at Disney, to join Walt Disney Imagineering as a Disney Fellow. He remained there until Ferren left to start Applied Minds Inc with Imagineer Danny Hillis, leading to the cessation of the Fellows program.
In 2001, Kay founded Viewpoints Research Institute, a nonprofit organization dedicated to children, learning, and advanced software development. For their first ten years, Kay and his Viewpoints group were based at Applied Minds in Glendale, California, where he and Ferren worked on various projects. Kay served as president of the Institute until its closure in 2018.
In 2002 Kay joined HP Labs as a senior fellow, departing when HP disbanded the Advanced Software Research Team on July 20, 2005.
He has been an adjunct professor of computer science at the University of California, Los Angeles, a visiting professor at Kyoto University, and an adjunct professor at the Massachusetts Institute of Technology (MIT). Kay served on the advisory board of TTI/Vanguard.
Squeak, Etoys, and Croquet.
In December 1995, while still at Apple, Kay collaborated with many others to start the open source Squeak version of Smalltalk. As part of this effort, in November 1996, his team began research on what became the Etoys system. More recently he started, with David A. Smith, David P. Reed, Andreas Raab, Rick McGeer, Julian Lombardi, and Mark McCahill, the Croquet Project, an open-source networked 2D and 3D environment for collaborative work.
Tweak.
In 2001, it became clear that the Etoy architecture in Squeak had reached its limits in what the Morphic interface infrastructure could do. Andreas Raab, a researcher in Kay's group then at Hewlett-Packard, proposed defining a "script process" and providing a default scheduling mechanism that avoided several more general problems. The result was a new user interface, proposed to replace the Squeak Morphic user interface. Tweak added mechanisms of islands, asynchronous messaging, players and costumes, language extensions, projects, and tile scripting. Its underlying object system is class-based, but to users (during programming) it acts as if it were prototype-based. Tweak objects are created and run in Tweak project windows.
The Children's Machine.
In November 2005, at the World Summit on the Information Society, the MIT research laboratories unveiled a new laptop computer for educational use around the world. It has many names, including the $100 Laptop, the One Laptop per Child program, the Children's Machine, and the XO-1. The program was founded and is sustained by Kay's friend Nicholas Negroponte, and is based on Kay's Dynabook ideal. Kay is a prominent co-developer of the computer, focusing on its educational software using Squeak and Etoys.
Reinventing programming.
Kay has lectured extensively on the idea that the computer revolution is very new, and all of the good ideas have not been universally implemented. His lectures at the OOPSLA 1997 conference, and his ACM Turing Award talk, "The Computer Revolution Hasn't Happened Yet", were informed by his experiences with Sketchpad, Simula, Smalltalk, and the bloated code of commercial software.
On August 31, 2006, Kay's proposal to the United States National Science Foundation (NSF) was granted, funding Viewpoints Research Institute for several years. The proposal title was "STEPS Toward the Reinvention of Programming: A compact and Practical Model of Personal Computing as a Self-exploratorium". STEPS is a recursive acronym that stands for "STEPS Toward Expressive Programming Systems". A sense of what Kay is trying to do comes from this quote, from the abstract of a seminar at Intel Research Labs, Berkeley: "The conglomeration of commercial and most open source software consumes in the neighborhood of several hundreds of millions of lines of code these days. We wonder: how small could be an understandable practical 'Model T' design that covers this functionality? 1M lines of code? 200K LOC? 100K LOC? 20K LOC?"
Personal life.
Kay is a former professional jazz guitarist, composer, and theatrical designer.
He also is an amateur classical pipe organist.
Awards and honors.
Kay has received many awards and honors, including:
– Kungliga Tekniska Högskolan (Royal Institute of Technology) in Stockholm (2002)
– Georgia Institute of Technology (2005)
– Columbia College Chicago awarded Doctor of Humane Letters, Honoris Causa (2005)
– Laurea Honoris Causa in Informatica, Università di Pisa, Italy (2007)
– University of Waterloo (2008)
– Kyoto University (2009)
– Universidad de Murcia (2010)
– University of Edinburgh (2017)
– American Academy of Arts and Sciences
– National Academy of Engineering for inventing the concept of portable personal computing. (1997)
– Royal Society of Arts
– Computer History Museum "for his fundamental contributions to personal computing and human-computer interface development." (1999)
– Association for Computing Machinery "For fundamental contributions to personal computing and object-oriented programming." (2008)
– Hasso Plattner Institute (2011)
His other honors include the J-D Warnier Prix d'Informatique, the ACM Systems Software Award, the NEC Computers & Communication Foundation Prize, the Funai Foundation Prize, the Lewis Branscomb Technology Award, and the ACM SIGCSE Award for Outstanding Contributions to Computer Science Education.
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APL (programming language)
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APL (named after the book "A Programming Language") is a programming language developed in the 1960s by Kenneth E. Iverson. Its central datatype is the multidimensional array. It uses a large range of special graphic symbols to represent most functions and operators, leading to very concise code. It has been an important influence on the development of concept modeling, spreadsheets, functional programming, and computer math packages. It has also inspired several other programming languages.
History.
Mathematical notation.
A mathematical notation for manipulating arrays was developed by Kenneth E. Iverson, starting in 1957 at Harvard University. In 1960, he began work for IBM where he developed this notation with Adin Falkoff and published it in his book "A Programming Language" in 1962. The preface states its premise:
This notation was used inside IBM for short research reports on computer systems, such as the Burroughs B5000 and its stack mechanism when stack machines versus register machines were being evaluated by IBM for upcoming computers.
Iverson also used his notation in a draft of the chapter "A Programming Language", written for a book he was writing with Fred Brooks, "Automatic Data Processing", which would be published in 1963.
In 1979, Iverson received the Turing Award for his work on APL.
Development into a computer programming language.
As early as 1962, the first attempt to use the notation to describe a complete computer system happened after Falkoff discussed with William C. Carter his work to standardize the instruction set for the machines that later became the IBM System/360 family.
In 1963, Herbert Hellerman, working at the IBM Systems Research Institute, implemented a part of the notation on an IBM 1620 computer, and it was used by students in a special high school course on calculating transcendental functions by series summation. Students tested their code in Hellerman's lab. This implementation of a part of the notation was called Personalized Array Translator (PAT).
In 1963, Falkoff, Iverson, and Edward H. Sussenguth Jr., all working at IBM, used the notation for a formal description of the IBM System/360 series machine architecture and functionality, which resulted in a paper published in "IBM Systems Journal" in 1964. After this was published, the team turned their attention to an implementation of the notation on a computer system. One of the motivations for this focus of implementation was the interest of John L. Lawrence who had new duties with Science Research Associates, an educational company bought by IBM in 1964. Lawrence asked Iverson and his group to help use the language as a tool to develop and use computers in education.
After Lawrence M. Breed and Philip S. Abrams of Stanford University joined the team at IBM Research, they continued their prior work on an implementation programmed in FORTRAN IV for a part of the notation which had been done for the IBM 7090 computer running on the IBSYS operating system. This work was finished in late 1965 and later named IVSYS (for Iverson system). The basis of this implementation was described in detail by Abrams in a Stanford University Technical Report, "An Interpreter for Iverson Notation" in 1966. The academic aspect of this was formally supervised by Niklaus Wirth. Like Hellerman's PAT system earlier, this implementation omitted the APL character set, but used special English reserved words for functions and operators. The system was later adapted for a time-sharing system and, by November 1966, it had been reprogrammed for the IBM System/360 Model 50 computer running in a time-sharing mode and was used internally at IBM.
Hardware.
A key development in the ability to use APL effectively, before the wide use of cathode-ray tube (CRT) terminals, was the development of a special IBM Selectric typewriter interchangeable typing element with all the special APL characters on it. This was used on paper printing terminal workstations using the Selectric typewriter and typing element mechanism, such as the IBM 1050 and IBM 2741 terminal. Keycaps could be placed over the normal keys to show which APL characters would be entered and typed when that key was struck. For the first time, a programmer could type in and see proper APL characters as used in Iverson's notation and not be forced to use awkward English keyword representations of them. Falkoff and Iverson had the special APL Selectric typing elements, 987 and 988, designed in late 1964, although no APL computer system was available to use them. Iverson cited Falkoff as the inspiration for the idea of using an IBM Selectric typing element for the APL character set.
Many APL symbols, even with the APL characters on the Selectric typing element, still had to be typed in by over-striking two extant element characters. An example is the "grade up" character, which had to be made from a "delta" (shift-H) and a "Sheffer stroke" (shift-M). This was necessary because the APL character set was much larger than the 88 characters allowed on the typing element, even when letters were restricted to upper-case (capitals).
Commercial availability.
The first APL interactive login and creation of an APL workspace was in 1966 by Larry Breed using an IBM 1050 terminal at the IBM Mohansic Labs near Thomas J. Watson Research Center, the home of APL, in Yorktown Heights, New York.
IBM was chiefly responsible for introducing APL to the marketplace. The first publicly available version of APL was released in 1968 for the IBM 1130. IBM provided "APL\1130" for free but without liability or support. It would run in as little as 8k 16-bit words of memory, and used a dedicated 1 megabyte hard disk.
APL gained its foothold on mainframe timesharing systems from the late 1960s through the early 1980s, in part because it would support multiple users on lower-specification systems that had no dynamic address translation hardware. Additional improvements in performance for selected IBM System/370 mainframe systems included the "APL Assist Microcode" in which some support for APL execution was included in the processor's firmware, as distinct from being implemented entirely by higher-level software. Somewhat later, as suitably performing hardware was finally growing available in the mid- to late-1980s, many users migrated their applications to the personal computer environment.
Early IBM APL interpreters for IBM 360 and IBM 370 hardware implemented their own multi-user management instead of relying on the host services, thus they were their own timesharing systems. First introduced for use at IBM in 1966, the "APL\360" system was a multi-user interpreter. The ability to programmatically communicate with the operating system for information and setting interpreter system variables was done through special privileged "I-beam" functions, using both monadic and dyadic operations.
In 1973, IBM released "APL.SV", which was a continuation of the same product, but which offered shared variables as a means to access facilities outside of the APL system, such as operating system files. In the mid-1970s, the IBM mainframe interpreter was even adapted for use on the IBM 5100 desktop computer, which had a small CRT and an APL keyboard, when most other small computers of the time only offered BASIC. In the 1980s, the "VSAPL" program product enjoyed wide use with Conversational Monitor System (CMS), Time Sharing Option (TSO), VSPC, MUSIC/SP, and CICS users.
In 1973–1974, Patrick E. Hagerty directed the implementation of the University of Maryland APL interpreter for the 1100 line of the Sperry UNIVAC 1100/2200 series mainframe computers. In 1974, student Alan Stebbens was assigned the task of implementing an internal function. Xerox APL was available from June 1975 for Xerox 560 and Sigma 6, 7, and 9 mainframes running CP-V and for Honeywell CP-6.
In the 1960s and 1970s, several timesharing firms arose that sold APL services using modified versions of the IBM APL\360 interpreter. In North America, the better-known ones were IP Sharp Associates, Scientific Time Sharing Corporation (STSC), Time Sharing Resources (TSR), and The Computer Company (TCC). CompuServe also entered the market in 1978 with an APL Interpreter based on a modified version of Digital Equipment Corp and Carnegie Mellon's, which ran on DEC's KI and KL 36-bit machines. CompuServe's APL was available both to its commercial market and the consumer information service. With the advent first of less expensive mainframes such as the IBM 4300, and later the personal computer, by the mid-1980s, the timesharing industry was all but gone.
"Sharp APL" was available from IP Sharp Associates, first as a timesharing service in the 1960s, and later as a program product starting around 1979. "Sharp APL" was an advanced APL implementation with many language extensions, such as "packages" (the ability to put one or more objects into a single variable), a file system, nested arrays, and shared variables.
APL interpreters were available from other mainframe and mini-computer manufacturers also, notably Burroughs, Control Data Corporation (CDC), Data General, Digital Equipment Corporation (DEC), Harris, Hewlett-Packard (HP), Siemens, Xerox and others.
Garth Foster of Syracuse University sponsored regular meetings of the APL implementers' community at Syracuse's Minnowbrook Conference Center in Blue Mountain Lake, New York. In later years, Eugene McDonnell organized similar meetings at the Asilomar Conference Grounds near Monterey, California, and at Pajaro Dunes near Watsonville, California. The SIGAPL special interest group of the Association for Computing Machinery continues to support the APL community.
Microcomputers.
On microcomputers, which became available from the mid-1970s onwards, BASIC became the dominant programming language. Nevertheless, some microcomputers provided APL instead – the first being the Intel 8008-based MCM/70 which was released in 1974 and which was primarily used in education. Another machine of this time was the VideoBrain Family Computer, released in 1977, which was supplied with its dialect of APL called APL/S.
The Commodore SuperPET, introduced in 1981, included an APL interpreter developed by the University of Waterloo.
In 1976, Bill Gates claimed in his Open Letter to Hobbyists that Microsoft Corporation was implementing APL for the Intel 8080 and Motorola 6800 but had "very little incentive to make [it] available to hobbyists" because of software piracy. It was never released.
APL2.
Starting in the early 1980s, IBM APL development, under the leadership of Jim Brown, implemented a new version of the APL language that contained as its primary enhancement the concept of "nested arrays", where an array can contain other arrays, and new language features which facilitated integrating nested arrays into program workflow. Ken Iverson, no longer in control of the development of the APL language, left IBM and joined I. P. Sharp Associates, where one of his major contributions was directing the evolution of Sharp APL to be more in accord with his vision. APL2 was first released for CMS and TSO in 1984. The APL2 Workstation edition (Windows, OS/2, AIX, Linux, and Solaris) followed later.
As other vendors were busy developing APL interpreters for new hardware, notably Unix-based microcomputers, APL2 was almost always the standard chosen for new APL interpreter developments. Even today, most APL vendors or their users cite APL2 compatibility as a selling point for those products. IBM cites its use for problem solving, system design, prototyping, engineering and scientific computations, expert systems, for teaching mathematics and other subjects, visualization and database access.
Modern implementations.
Various implementations of APL by APLX, Dyalog, et al., include extensions for object-oriented programming, support for .NET, XML-array conversion primitives, graphing, operating system interfaces, and lambda calculus expressions. Freeware versions include GNU APL for Linux and NARS2000 for Windows (which also runs on Linux under Wine). Both of these are fairly complete versions of APL2 with various language extensions.
Derivative languages.
APL has formed the basis of, or influenced, the following languages:
Language characteristics.
Character set.
APL has been criticized and praised for its choice of a unique character set. In the 1960s and 1970s, few terminal devices or even displays could reproduce the APL character set. The most popular ones employed the IBM Selectric print mechanism used with a special APL type element. One of the early APL line terminals (line-mode operation only, "not" full screen) was the Texas Instruments TI Model 745 () with the full APL character set which featured half and full duplex telecommunications modes, for interacting with an APL time-sharing service or remote mainframe to run a remote computer job, remote job entry (RJE).
Over time, with the universal use of high-quality graphic displays, printing devices and Unicode support, the APL character font problem has largely been eliminated. However, entering APL characters requires the use of input method editors, keyboard mappings, virtual/on-screen APL symbol sets, or easy-reference printed keyboard cards which can frustrate beginners accustomed to other programming languages. With beginners who have no prior experience with other programming languages, a study involving high school students found that typing and using APL characters did not hinder the students in any measurable way.
In defense of APL, it requires fewer characters to type, and keyboard mappings become memorized over time. Special APL keyboards are also made and in use today, as are freely downloadable fonts for operating systems such as Microsoft Windows. The reported productivity gains assume that one spends enough time working in the language to make it worthwhile to memorize the symbols, their semantics, keyboard mappings, and many idioms for common tasks.
Design.
Unlike traditionally structured programming languages, APL code is typically structured as chains of monadic or dyadic functions, and operators acting on arrays. APL has many nonstandard "primitives" (functions and operators) that are indicated by a single symbol or a combination of a few symbols. All primitives are defined to have the same precedence, and always associate to the right. Thus, APL is "read" or best understood from right-to-left.
Early APL implementations ( or so) had no programming loop control flow structures, such as codice_1 or codice_2 loops, and codice_3 constructs. Instead, they used array operations, and use of structured programming constructs was often unneeded, since an operation could be performed on a full array in one statement. For example, the codice_4 function (codice_5) can replace for-loop iteration: ιN when applied to a scalar positive integer yields a one-dimensional array (vector), 1 2 3 ... N. Later APL implementations generally include comprehensive control structures, so that data structure and program control flow can be clearly and cleanly separated.
The APL environment is called a "workspace". In a workspace the user can define programs and data, i.e., the data values exist also outside the programs, and the user can also manipulate the data without having to define a program. In the examples below, the APL interpreter first types six spaces before awaiting the user's input. Its own output starts in column one.
The user can save the workspace with all values, programs, and execution status.
APL uses a set of non-ASCII symbols, which are an extension of traditional arithmetic and algebraic notation. Having single character names for single instruction, multiple data (SIMD) vector functions is one way that APL enables compact formulation of algorithms for data transformation such as computing Conway's Game of Life in one line of code. In nearly all versions of APL, it is theoretically possible to express any computable function in one expression, that is, in one line of code.
Due to the unusual character set, many programmers use special keyboards with APL keytops to write APL code. Although there are various ways to write APL code using only ASCII characters, in practice it is almost never done. (This may be thought to support Iverson's thesis about notation as a tool of thought.) Most if not all modern implementations use standard keyboard layouts, with special mappings or input method editors to access non-ASCII characters. Historically, the APL font has been distinctive, with uppercase italic alphabetic characters and upright numerals and symbols. Most vendors continue to display the APL character set in a custom font.
Advocates of APL claim that the examples of so-called "write-only code" (badly written and almost incomprehensible code) are almost invariably examples of poor programming practice or novice mistakes, which can occur in any language. Advocates also claim that they are far more productive with APL than with more conventional computer languages, and that working software can be implemented in far less time and with far fewer programmers than using other technology.
They also may claim that because it is compact and terse, APL lends itself well to larger-scale software development and complexity, because the number of lines of code can be reduced greatly. Many APL advocates and practitioners also view standard programming languages such as COBOL and Java as being comparatively tedious. APL is often found where time-to-market is important, such as with trading systems.
Terminology.
APL makes a clear distinction between "functions" and "operators". Functions take arrays (variables or constants or expressions) as arguments, and return arrays as results. Operators (similar to higher-order functions) take functions or arrays as arguments, and derive related functions. For example, the "sum" function is derived by applying the "reduction" operator to the "addition" function. Applying the same reduction operator to the "maximum" function (which returns the larger of two numbers) derives a function which returns the largest of a group (vector) of numbers. In the J language, Iverson substituted the terms "verb" for "function" and "adverb" or "conjunction" for "operator".
APL also identifies those features built into the language, and represented by a symbol, or a fixed combination of symbols, as "primitives". Most primitives are either functions or operators. Coding APL is largely a process of writing non-primitive functions and (in some versions of APL) operators. However a few primitives are considered to be neither functions nor operators, most noticeably assignment.
Some words used in APL literature have meanings that differ from those in both mathematics and the generality of computer science.
Syntax.
APL has explicit representations of functions, operators, and syntax, thus providing a basis for the clear and explicit statement of extended facilities in the language, and tools to experiment on them.
Examples.
Hello, world.
This displays "Hello, world":
'Hello, world'
A design theme in APL is to define default actions in some cases that would produce syntax errors in most other programming languages.
The 'Hello, world' string constant above displays, because display is the default action on any expression for which no action is specified explicitly (e.g. assignment, function parameter).
Exponentiation.
Another example of this theme is that exponentiation in APL is written as , which indicates raising 2 to the power 3 (this would be written as or in some languages, or relegated to a function call such as in others). Many languages use to signify multiplication, as in , but APL chooses to use . However, if no base is specified (as with the statement in APL, or in other languages), most programming languages one would see this as a syntax error. APL, however, assumes the missing base to be the natural logarithm constant e, and interprets as .
Simple statistics.
Suppose that is an array of numbers. Then gives its average. Reading "right-to-left", gives the number of elements in X, and since is a dyadic operator, the term to its left is required as well. It is surrounded by parentheses since otherwise X would be taken (so that the summation would be of —each element of X divided by the number of elements in X), and gives the sum of the elements of X. Building on this, the following expression computes standard deviation:
Naturally, one would define this expression as a function for repeated use rather than rewriting it each time. Further, since assignment is an operator, it can appear within an expression, so the following would place suitable values into T, AV and SD:
"Pick 6" lottery numbers.
This following immediate-mode expression generates a typical set of "Pick 6" lottery numbers: six pseudo-random integers ranging from 1 to 40, "guaranteed non-repeating", and displays them sorted in ascending order:
x[⍋x←6?40]
The above does a lot, concisely, although it may seem complex to a new APLer. It combines the following APL "functions" (also called "primitives" and "glyphs"):
Since there is no function to the left of the left-most x to tell APL what to do with the result, it simply outputs it to the display (on a single line, separated by spaces) without needing any explicit instruction to do that.
codice_6 also has a monadic equivalent called codice_15, which simply returns one random integer between 1 and its sole operand [to the right of it], inclusive. Thus, a role-playing game program might use the expression codice_16 to roll a twenty-sided die.
Prime numbers.
The following expression finds all prime numbers from 1 to R. In both time and space, the calculation complexity is formula_1 (in Big O notation).
(~R∊R∘.×R)/R←1↓⍳R
Executed from right to left, this means:
Sorting.
The following expression sorts a word list stored in matrix X according to word length:
X[⍋X+.≠' ';]
Game of Life.
The following function "life", written in Dyalog APL, takes a Boolean matrix and calculates the new generation according to Conway's Game of Life. It demonstrates the power of APL to implement a complex algorithm in very little code, but understanding it requires some advanced knowledge of APL (as the same program would in many languages).
HTML tags removal.
In the following example, also Dyalog, the first line assigns some HTML code to a variable codice_47 and then uses an APL expression to remove all the HTML tags:
txt←'<html><body><p>This is <em>emphasized</em> text.</p></body></html>'
{⍵ /⍨ ~{⍵∨≠\⍵}⍵∊'<>'} txt
This is emphasized text.
Naming.
APL derives its name from the initials of Iverson's book "A Programming Language", even though the book describes Iverson's mathematical notation, rather than the implemented programming language described in this article. The name is used only for actual implementations, starting with APL\360.
Adin Falkoff coined the name in 1966 during the implementation of APL\360 at IBM:
"APL" is occasionally re-interpreted as "Array Programming Language" or "Array Processing Language", thereby making "APL" into a backronym.
Logo.
There has always been cooperation between APL vendors, and joint conferences were held on a regular basis from 1969 until 2010. At such conferences, APL merchandise was often handed out, featuring APL motifs or collection of vendor logos. Common were apples (as a pun on the similarity in pronunciation of "apple" and "APL") and the code snippet which are the symbols produced by the classic APL keyboard layout when holding the APL modifier key and typing "APL".
Despite all these community efforts, no universal vendor-agnostic logo for the programming language emerged. As popular programming languages increasingly have established recognisable logos, Fortran getting one in 2020, British APL Association launched a campaign in the second half of 2021, to establish such a logo for APL, and after a community election and multiple rounds of feedback, a logo was chosen in May 2022.
Use.
APL is used for many purposes including financial and insurance applications, artificial intelligence,
neural networks
and robotics. It has been argued that APL is a calculation tool and not a programming language; its symbolic nature and array capabilities have made it popular with domain experts and data scientists who do not have or require the skills of a computer programmer.
APL is well suited to image manipulation and computer animation, where graphic transformations can be encoded as matrix multiplications. One of the first commercial computer graphics houses, Digital Effects, produced an APL graphics product named "Visions", which was used to create television commercials and animation for the 1982 film "Tron". Latterly, the Stormwind boating simulator uses APL to implement its core logic, its interfacing to the rendering pipeline middleware and a major part of its physics engine.
Today, APL remains in use in a wide range of commercial and scientific applications, for example
investment management,
asset management,
health care,
and DNA profiling.
Notable implementations.
APL\360.
The first implementation of APL using recognizable APL symbols was APL\360 which ran on the IBM System/360, and was completed in November 1966 though at that time remained in use only within IBM. In 1973 its implementors, Larry Breed, Dick Lathwell and Roger Moore, were awarded the Grace Murray Hopper Award from the Association for Computing Machinery (ACM). It was given "for their work in the design and implementation of APL\360, setting new standards in simplicity, efficiency, reliability and response time for interactive systems."
In 1975, the IBM 5100 microcomputer offered APL\360 as one of two built-in ROM-based interpreted languages for the computer, complete with a keyboard and display that supported all the special symbols used in the language.
Significant developments to APL\360 included CMS/APL, which made use of the virtual storage capabilities of CMS and APLSV, which introduced shared variables, system variables and system functions. It was subsequently ported to the IBM System/370 and VSPC platforms until its final release in 1983, after which it was replaced by APL2.
APL\1130.
In 1968, APL\1130 became the first publicly available APL system, created by IBM for the IBM 1130. It became the most popular IBM Type-III Library software that IBM released.
APL*Plus and Sharp APL.
APL*Plus and Sharp APL are versions of APL\360 with added business-oriented extensions such as data formatting and facilities to store APL arrays in external files. They were jointly developed by two companies, employing various members of the original IBM APL\360 development team.
The two companies were I. P. Sharp Associates (IPSA), an APL\360 services company formed in 1964 by Ian Sharp, Roger Moore and others, and STSC, a time-sharing and consulting service company formed in 1969 by Lawrence Breed and others. Together the two developed APL*Plus and thereafter continued to work together but develop APL separately as APL*Plus and Sharp APL. STSC ported APL*Plus to many platforms with versions being made for the VAX 11, PC and UNIX, whereas IPSA took a different approach to the arrival of the personal computer and made Sharp APL available on this platform using additional PC-XT/360 hardware. In 1993, Soliton Incorporated was formed to support Sharp APL and it developed Sharp APL into SAX (Sharp APL for Unix). , APL*Plus continues as APL2000 APL+Win.
In 1985, Ian Sharp, and Dan Dyer of STSC, jointly received the Kenneth E. Iverson Award for Outstanding Contribution to APL.
APL2.
APL2 was a significant re-implementation of APL by IBM which was developed from 1971 and first released in 1984. It provides many additions to the language, of which the most notable is nested (non-rectangular) array support. The entire APL2 Products and Services Team was awarded the Iverson Award in 2007.
In 2021, IBM sold APL2 to Log-On Software, who develop and sell the product as "Log-On APL2".
APLGOL.
In 1972, APLGOL was released as an experimental version of APL that added structured programming language constructs to the language framework. New statements were added for interstatement control, conditional statement execution, and statement structuring, as well as statements to clarify the intent of the algorithm. It was implemented for Hewlett-Packard in 1977.
Dyalog APL.
Dyalog APL was first released by British company Dyalog Ltd. in 1983 and, , is available for AIX, Linux (including on the Raspberry Pi), macOS and Microsoft Windows platforms. It is based on APL2, with extensions to support object-oriented programming, functional programming, and tacit programming. Licences are free for personal/non-commercial use.
In 1995, two of the development team – John Scholes and Peter Donnelly – were awarded the Iverson Award for their work on the interpreter. Gitte Christensen and Morten Kromberg were joint recipients of the Iverson Award in 2016.
NARS2000.
NARS2000 is an open-source APL interpreter written by Bob Smith, a prominent APL developer and implementor from STSC in the 1970s and 1980s. NARS2000 contains advanced features and new datatypes and runs natively on Microsoft Windows, and other platforms under Wine. It is named after a development tool from the 1980s, NARS (Nested Arrays Research System).
APLX.
APLX is a cross-platform dialect of APL, based on APL2 and with several extensions, which was first released by British company MicroAPL in 2002. Although no longer in development or on commercial sale it is now available free of charge from Dyalog.
York APL.
York APL was developed at the York University, Ontario around 1968, running on IBM 360 mainframes. One notable difference between it and APL\360 was that it defined the "shape" (ρ) of a scalar as 1 whereas APL\360 defined it as the more mathematically correct 0 — this made it easier to write functions that acted the same with scalars and vectors.
GNU APL.
GNU APL is a free implementation of Extended APL as specified in ISO/IEC 13751:2001 and is thus an implementation of APL2. It runs on Linux, macOS, several BSD dialects, and on Windows (either using Cygwin for full support of all its system functions or as a native 64-bit Windows binary with some of its system functions missing). GNU APL uses Unicode internally and can be scripted. It was written by Jürgen Sauermann.
Richard Stallman, founder of the GNU Project, was an early adopter of APL, using it to write a text editor as a high school student in the summer of 1969.
Interpretation and compilation of APL.
APL is traditionally an interpreted language, having language characteristics such as weak variable typing not well suited to compilation. However, with arrays as its core data structure it provides opportunities for performance gains through parallelism, parallel computing, massively parallel applications, and very-large-scale integration (VLSI), and from the outset APL has been regarded as a high-performance language – for example, it was noted for the speed with which it could perform complicated matrix operations "because it operates on arrays and performs operations like matrix inversion internally".
Nevertheless, APL is rarely purely interpreted and compilation or partial compilation techniques that are, or have been, used include the following:
Idiom recognition.
Most APL interpreters support idiom recognition and evaluate common idioms as single operations. For example, by evaluating the idiom codice_48 as a single operation (where codice_49 is a Boolean vector and codice_50 is an array), the creation of two intermediate arrays is avoided.
Optimised bytecode.
Weak typing in APL means that a name may reference an array (of any datatype), a function or an operator. In general, the interpreter cannot know in advance which form it will be and must therefore perform analysis, syntax checking etc. at run-time. However, in certain circumstances, it is possible to deduce in advance what type a name is expected to reference and then generate bytecode which can be executed with reduced run-time overhead. This bytecode can also be optimised using compilation techniques such as constant folding or common subexpression elimination. The interpreter will execute the bytecode when present and when any assumptions which have been made are met. Dyalog APL includes support for optimised bytecode.
Compilation.
Compilation of APL has been the subject of research and experiment since the language first became available; the first compiler is considered to be the Burroughs APL-700 which was released around 1971. In order to be able to compile APL, language limitations have to be imposed. APEX is a research APL compiler which was written by Robert Bernecky and is available under the GNU General Public License.
The STSC APL Compiler is a hybrid of a bytecode optimiser and a compiler – it enables compilation of functions to machine code provided that its sub-functions and globals are declared, but the interpreter is still used as a runtime library and to execute functions which do not meet the compilation requirements.
Standards.
APL has been standardized by the American National Standards Institute (ANSI) working group X3J10 and International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC), ISO/IEC Joint Technical Committee 1 Subcommittee 22 Working Group 3. The Core APL language is specified in ISO 8485:1989, and the Extended APL language is specified in ISO/IEC 13751:2001.
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1453
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1132152
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https://en.wikipedia.org/wiki?curid=1453
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ALGOL
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ALGOL (; short for "Algorithmic Language") is a family of imperative computer programming languages originally developed in 1958. ALGOL heavily influenced many other languages and was the standard method for algorithm description used by the Association for Computing Machinery (ACM) in textbooks and academic sources for more than thirty years.
In the sense that the syntax of most modern languages is "Algol-like", it was arguably more influential than three other high-level programming languages among which it was roughly contemporary: FORTRAN, Lisp, and COBOL. It was designed to avoid some of the perceived problems with FORTRAN and eventually gave rise to many other programming languages, including PL/I, Simula, BCPL, B, Pascal, Ada, and C.
ALGOL introduced code blocks and the codice_1...codice_2 pairs for delimiting them. It was also the first language implementing nested function definitions with lexical scope. Moreover, it was the first programming language which gave detailed attention to formal language definition and through the "Algol 60 Report" introduced Backus–Naur form, a principal formal grammar notation for language design.
There were three major specifications, named after the years they were first published:
ALGOL 68 is substantially different from ALGOL 60 and was not well received, so reference to "Algol" is generally understood to mean ALGOL 60 and its dialects.
History.
ALGOL was developed jointly by a committee of European and American computer scientists in a meeting in 1958 at the Swiss Federal Institute of Technology in Zurich (cf. ALGOL 58). It specified three different syntaxes: a reference syntax, a publication syntax, and an implementation syntax, syntaxes that permitted it to use different keyword names and conventions for decimal points (commas vs periods) for different languages.
ALGOL was used mostly by research computer scientists in the United States and in Europe; commercial applications were hindered by the absence of standard input/output facilities in its description, and the lack of interest in the language by large computer vendors (other than Burroughs Corporation). ALGOL 60 did however become the standard for the publication of algorithms and had a profound effect on future language development.
John Backus developed the "Backus normal form" method of describing programming languages specifically for ALGOL 58. It was revised and expanded by Peter Naur for ALGOL 60, and at Donald Knuth's suggestion renamed Backus–Naur form.
Peter Naur: "As editor of the ALGOL Bulletin I was drawn into the international discussions of the language and was selected to be member of the European language design group in November 1959. In this capacity I was the editor of the ALGOL 60 report, produced as the result of the ALGOL 60 meeting in Paris in January 1960."
The following people attended the meeting in Paris (from 11 to 16 January):
Alan Perlis gave a vivid description of the meeting: "The meetings were exhausting, interminable, and exhilarating. One became aggravated when one's good ideas were discarded along with the bad ones of others. Nevertheless, diligence persisted during the entire period. The chemistry of the 13 was excellent."
Legacy.
A significant contribution of the ALGOL 58 Report was to provide standard terms for programming concepts: statement, declaration, type, label, primary, block, and others.
ALGOL 60 inspired many languages that followed it. Tony Hoare remarked: "Here is a language so far ahead of its time that it was not only an improvement on its predecessors but also on nearly all its successors." The Scheme programming language, a variant of Lisp that adopted the block structure and lexical scope of ALGOL, also adopted the wording "Revised Report on the Algorithmic Language Scheme" for its standards documents in homage to ALGOL.
Properties.
ALGOL 60 as officially defined had no I/O facilities; implementations defined their own in ways that were rarely compatible with each other. In contrast, ALGOL 68 offered an extensive library of "transput" (input/output) facilities.
ALGOL 60 allowed for two evaluation strategies for parameter passing: the common call-by-value, and call-by-name. Call-by-name has certain effects in contrast to call-by-reference. For example, without specifying the parameters as "value" or "reference", it is impossible to develop a procedure that will swap the values of two parameters if the actual parameters that are passed in are an integer variable and an array that is indexed by that same integer variable. Think of passing a pointer to swap(i, A[i]) in to a function. Now that every time swap is referenced, it is reevaluated. Say i := 1 and A[i] := 2, so every time swap is referenced it will return the other combination of the values ([1,2], [2,1], [1,2] and so on). A similar situation occurs with a random function passed as actual argument.
Call-by-name is known by many compiler designers for the interesting "thunks" that are used to implement it. Donald Knuth devised the "man or boy test" to separate compilers that correctly implemented "recursion and non-local references." This test contains an example of call-by-name.
ALGOL 68 was defined using a two-level grammar formalism invented by Adriaan van Wijngaarden and which bears his name. Van Wijngaarden grammars use a context-free grammar to generate an infinite set of productions that will recognize a particular ALGOL 68 program; notably, they are able to express the kind of requirements that in many other programming language standards are labelled "semantics" and have to be expressed in ambiguity-prone natural language prose, and then implemented in compilers as "ad hoc" code attached to the formal language parser.
Examples and portability.
Code sample comparisons.
ALGOL 60.
procedure Absmax(a) Size:(n, m) Result:(y) Subscripts:(i, k);
value n, m; array a; integer n, m, i, k; real y;
comment The absolute greatest element of the matrix a, of size n by m,
is copied to y, and the subscripts of this element to i and k;
begin
integer p, q;
y := 0; i := k := 1;
for p := 1 step 1 until n do
for q := 1 step 1 until m do
if abs(a[p, q]) > y then
begin y := abs(a[p, q]);
i := p; k := q
end
end Absmax
Here is an example of how to produce a table using Elliott 803 ALGOL.
FLOATING POINT ALGOL TEST'
BEGIN REAL A,B,C,D'
READ D'
FOR A:= 0.0 STEP D UNTIL 6.3 DO
BEGIN
PRINT ,££L??'
B := SIN(A)'
C := COS(A)'
PRINT PUNCH(3),,A,B,C'
END
END'
ALGOL 68.
The following code samples are ALGOL 68 versions of the above ALGOL 60 code samples.
ALGOL 68 implementations used ALGOL 60's approaches to stropping. In ALGOL 68's case tokens with the bold typeface are reserved words, types (modes) or operators.
proc abs max = ([,]real a, ref real y, ref int i, k)real:
comment The absolute greatest element of the matrix a, of size ⌈a by 2⌈a
is transferred to y, and the subscripts of this element to i and k; comment
begin
real y := 0; i := ⌊a; k := 2⌊a;
for p from ⌊a to ⌈a do
for q from 2⌊a to 2⌈a do
if abs a[p, q] > y then
y := abs a[p, q];
i := p; k := q
fi
od
od;
y
end # abs max #
Note: lower (⌊) and upper (⌈) bounds of an array, and array slicing, are directly available to the programmer.
floating point algol68 test:
real a,b,c,d;
# "printf" – sends output to the file "stand out". #
# "printf($p$);" – selects a "new page" #
printf(($pg$,"Enter d:"));
read(d);
for step from 0 while a:=step*d; a <= 2*pi do
printf($l$); # "$l$" - selects a "new line". #
b := sin(a);
c := cos(a);
printf(($z-d.6d$,a,b,c)) # formats output with 1 digit before and 6 after the decimal point. #
od
Timeline: Hello world.
The variations and lack of portability of the programs from one implementation to another is easily demonstrated by the classic hello world program.
ALGOL 58 (IAL).
ALGOL 58 had no I/O facilities.
ALGOL 60 family.
Since ALGOL 60 had no I/O facilities, there is no portable hello world program in ALGOL.
The next three examples are in Burroughs Extended Algol. The first two direct output at the interactive terminal they are run on. The first uses a character array, similar to C. The language allows the array identifier to be used as a pointer to the array, and hence in a REPLACE statement.
A simpler program using an inline format:
An even simpler program using the Display statement. Note that its output would end up at the system console ('SPO'):
An alternative example, using Elliott Algol I/O is as follows. Elliott Algol used different characters for "open-string-quote" and "close-string-quote", represented here by and .
Below is a version from Elliott 803 Algol (A104). The standard Elliott 803 used five-hole paper tape and thus only had upper case. The code lacked any quote characters so £ (UK Pound Sign) was used for open quote and ? (Question Mark) for close quote. Special sequences were placed in double quotes (e.g£. £L?? produced a new line on the teleprinter).
HIFOLKS'
BEGIN
PRINT £HELLO WORLD£L??'
END'
The ICT 1900 series Algol I/O version allowed input from paper tape or punched card. Paper tape 'full' mode allowed lower case. Output was to a line printer. The open and close quote characters were represented using '(' and ')' and spaces by %.
'BEGIN'
WRITE TEXT('('HELLO%WORLD')');
'END'
ALGOL 68.
ALGOL 68 code was published with reserved words typically in lowercase, but bolded or underlined.
begin
printf(($gl$,"Hello, world!"))
end
In the language of the "Algol 68 Report" the input/output facilities were collectively called the "Transput".
Timeline of ALGOL special characters.
The ALGOLs were conceived at a time when character sets were diverse and evolving rapidly; also, the ALGOLs were defined so that only "uppercase" letters were required.
1960: IFIP – The Algol 60 language and report included several mathematical symbols which are available on modern computers and operating systems, but, unfortunately, were unsupported on most computing systems at the time. For instance: ×, ÷, ≤, ≥, ≠, ¬, ∨, ∧, ⊂, ≡, ␣ and ⏨.
1961 September: ASCII – The ASCII character set, then in an early stage of development, had the \ (Back slash) character added to it in order to support ALGOL's Boolean operators /\ and \/.
1962: ALCOR – This character set included the unusual "᛭" runic cross character for multiplication and the "⏨" Decimal Exponent Symbol for floating point notation.
1964: GOST – The 1964 Soviet standard GOST 10859 allowed the encoding of 4-bit, 5-bit, 6-bit and 7-bit characters in ALGOL.
1968: The "Algol 68 Report" – used extant ALGOL characters, and further adopted →, ↓, ↑, □, ⌊, ⌈, ⎩, ⎧, ○, ⊥, and ¢ characters which can be found on the IBM 2741 keyboard with "typeball" (or "golf ball") print heads inserted (such as the APL golf ball). These became available in the mid-1960s while ALGOL 68 was being drafted. The report was translated into Russian, German, French, and Bulgarian, and allowed programming in languages with larger character sets, e.g., Cyrillic alphabet of the Soviet BESM-4. All ALGOL's characters are also part of the Unicode standard and most of them are available in several popular fonts.
2009 October: Unicode – The codice_3 (Decimal Exponent Symbol) for floating point notation was added to Unicode 5.2 for backward compatibility with historic Buran programme ALGOL software.
ALGOL implementations.
To date there have been at least 70 augmentations, extensions, derivations and sublanguages of Algol 60.
The Burroughs dialects included special Bootstrapping dialects such as ESPOL and NEWP. The latter is still used for Unisys MCP system software.
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1456
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38455
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https://en.wikipedia.org/wiki?curid=1456
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AWK
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AWK () is a domain-specific language designed for text processing and typically used as a data extraction and reporting tool. Like sed and grep, it is a filter, and it is a standard feature of most Unix-like operating systems.
The AWK language is a data-driven scripting language consisting of a set of actions to be taken against streams of textual data – either run directly on files or used as part of a pipeline – for purposes of extracting or transforming text, such as producing formatted reports. The language extensively uses the string datatype, associative arrays (that is, arrays indexed by key strings), and regular expressions. While AWK has a limited intended application domain and was especially designed to support one-liner programs, the language is Turing-complete, and even the early Bell Labs users of AWK often wrote well-structured large AWK programs.
AWK was created at Bell Labs in the 1970s, and its name is derived from the surnames of its authors: Alfred Aho (author of egrep), Peter Weinberger (who worked on tiny relational databases), and Brian Kernighan. The acronym is pronounced the same as the name of the bird species auk, which is illustrated on the cover of "The AWK Programming Language". When written in all lowercase letters, as codice_1, it refers to the Unix or Plan 9 program that runs scripts written in the AWK programming language.
History.
According to Brian Kernighan, one of the goals of AWK was to have a tool that would easily manipulate both numbers and strings. AWK was also inspired by Marc Rochkind's programming language that was used to search for patterns in input data, and was implemented using yacc.
As one of the early tools to appear in Version 7 Unix, AWK added computational features to a Unix pipeline besides the Bourne shell, the only scripting language available in a standard Unix environment. It is one of the mandatory utilities of the Single UNIX Specification, and is required by the Linux Standard Base specification.
In 1983, AWK was one of several UNIX tools available for Charles River Data Systems' UNOS operating system under Bell Laboratories license.
AWK was significantly revised and expanded in 1985–88, resulting in the GNU AWK implementation written by Paul Rubin, Jay Fenlason, and Richard Stallman, released in 1988. GNU AWK may be the most widely deployed version because it is included with GNU-based Linux packages. GNU AWK has been maintained solely by Arnold Robbins since 1994. Brian Kernighan's nawk (New AWK) source was first released in 1993 unpublicized, and publicly since the late 1990s; many BSD systems use it to avoid the GPL license.
AWK was preceded by sed (1974). Both were designed for text processing. They share the line-oriented, data-driven paradigm, and are particularly suited to writing one-liner programs, due to the implicit main loop and current line variables. The power and terseness of early AWK programs – notably the powerful regular expression handling and conciseness due to implicit variables, which facilitate one-liners – together with the limitations of AWK at the time, were important inspirations for the Perl language (1987). In the 1990s, Perl became very popular, competing with AWK in the niche of Unix text-processing languages.
Structure of AWK programs.
An AWK program is a series of pattern action pairs, written as:
where "condition" is typically an expression and "action" is a series of commands. The input is split into records, where by default records are separated by newline characters so that the input is split into lines. The program tests each record against each of the conditions in turn, and executes the "action" for each expression that is true. Either the condition or the action may be omitted. The condition defaults to matching every record. The default action is to print the record. This is the same pattern-action structure as sed.
In addition to a simple AWK expression, such as codice_2 or codice_3, the condition can be codice_4 or codice_5 causing the action to be executed before or after all records have been read, or "pattern1, pattern2" which matches the range of records starting with a record that matches "pattern1" up to and including the record that matches "pattern2" before again trying to match against "pattern1" on subsequent lines.
In addition to normal arithmetic and logical operators, AWK expressions include the tilde operator, codice_6, which matches a regular expression against a string. As handy syntactic sugar, "/regexp/" without using the tilde operator matches against the current record; this syntax derives from sed, which in turn inherited it from the ed editor, where codice_7 is used for searching. This syntax of using slashes as delimiters for regular expressions was subsequently adopted by Perl and ECMAScript, and is now common. The tilde operator was also adopted by Perl.
Commands.
AWK commands are the statements that are substituted for "action" in the examples above. AWK commands can include function calls, variable assignments, calculations, or any combination thereof. AWK contains built-in support for many functions; many more are provided by the various flavors of AWK. Also, some flavors support the inclusion of dynamically linked libraries, which can also provide more functions.
The "print" command.
The "print" command is used to output text. The output text is always terminated with a predefined string called the output record separator (ORS) whose default value is a newline. The simplest form of this command is:
This displays the contents of the current record. In AWK, records are broken down into "fields", and these can be displayed separately:
Displays the first field of the current record
Displays the first and third fields of the current record, separated by a predefined string called the output field separator (OFS) whose default value is a single space character
Although these fields ("$X") may bear resemblance to variables (the $ symbol indicates variables in the usual Unix shells and in Perl), they actually refer to the fields of the current record. A special case, "$0", refers to the entire record. In fact, the commands "codice_8" and "codice_12" are identical in functionality.
The "print" command can also display the results of calculations and/or function calls:
/regex_pattern/ {
# Actions to perform in the event the record (line) matches the above regex_pattern
print 3+2
print foobar(3)
print foobar(variable)
print sin(3-2)
Output may be sent to a file:
/regex_pattern/ {
# Actions to perform in the event the record (line) matches the above regex_pattern
print "expression" > "file name"
or through a pipe:
/regex_pattern/ {
# Actions to perform in the event the record (line) matches the above regex_pattern
print "expression" | "command"
Built-in variables.
AWK's built-in variables include the field variables: $1, $2, $3, and so on ($0 represents the entire record). They hold the text or values in the individual text-fields in a record.
Other variables include:
Variables and syntax.
Variable names can use any of the characters [A-Za-z0-9_], with the exception of language keywords, and cannot begin with a numeric digit. The operators "+ - * /" represent addition, subtraction, multiplication, and division, respectively. For string concatenation, simply place two variables (or string constants) next to each other. It is optional to use a space in between if string constants are involved, but two variable names placed adjacent to each other require a space in between. Double quotes delimit string constants. Statements need not end with semicolons. Finally, comments can be added to programs by using "#" as the first character on a line, or behind a command or sequence of commands.
User-defined functions.
In a format similar to C, function definitions consist of the keyword codice_22, the function name, argument names and the function body. Here is an example of a function.
function add_three(number) {
return number + 3
This statement can be invoked as follows:
(pattern) {
print add_three(36) # Outputs 39
Functions can have variables that are in the local scope. The names of these are added to the end of the argument list, though values for these should be omitted when calling the function. It is convention to add some whitespace in the argument list before the local variables, to indicate where the parameters end and the local variables begin.
Examples.
Hello, World!
Here is the customary "Hello, World!" program written in AWK:
BEGIN {
print "Hello, world!"
exit
Print lines longer than 80 characters.
Print all lines longer than 80 characters. The default action is to print the current line.
length($0) > 80
Count words.
Count words in the input and print the number of lines, words, and characters (like wc):
words += NF
chars += length + 1 # add one to account for the newline character at the end of each record (line)
As there is no pattern for the first line of the program, every line of input matches by default, so the increment actions are executed for every line. codice_23 is shorthand for codice_24.
Sum last word.
codice_25 is incremented by the numeric value of codice_26, which is the last word on the line as defined by AWK's field separator (by default, white-space). codice_15 is the number of fields in the current line, e.g. 4. Since codice_28 is the value of the fourth field, codice_26 is the value of the last field in the line regardless of how many fields this line has, or whether it has more or fewer fields than surrounding lines. codice_30 is actually a unary operator with the highest operator precedence. (If the line has no fields, then codice_15 is 0, codice_32 is the whole line, which in this case is empty apart from possible white-space, and so has the numeric value 0.)
At the end of the input, the codice_5 pattern matches, so codice_25 is printed. However, since there may have been no lines of input at all, in which case no value has ever been assigned to codice_25, codice_25 will be an empty string by default. Adding zero to a variable is an AWK idiom for coercing it from a string to a numeric value. This results from AWK's arithmetic operators, like addition, implicitly casting their operands to numbers before computation as required. (Similarly, concatenating a variable with an empty string coerces from a number to a string, e.g., codice_37. Note, there is no operator to concatenate strings, they are just placed adjacently.) On an empty input, the coercion in codice_38 causes the program to print codice_39, whereas with just the action codice_40, an empty line would be printed.
Match a range of input lines.
The action statement prints each line numbered. The printf function emulates the standard C printf and works similarly to the print command described above. The pattern to match, however, works as follows: "NR" is the number of records, typically lines of input, AWK has so far read, i.e. the current line number, starting at 1 for the first line of input. "%" is the modulo operator. "NR % 4 == 1" is true for the 1st, 5th, 9th, etc., lines of input. Likewise, "NR % 4 == 3" is true for the 3rd, 7th, 11th, etc., lines of input. The range pattern is false until the first part matches, on line 1, and then remains true up to and including when the second part matches, on line 3. It then stays false until the first part matches again on line 5.
Thus, the program prints lines 1,2,3, skips line 4, and then 5,6,7, and so on. For each line, it prints the line number (on a 6 character-wide field) and then the line contents. For example, when executed on this input:
Rome
Florence
Milan
Naples
Turin
Venice
The previous program prints:
1 Rome
2 Florence
3 Milan
5 Turin
6 Venice
Printing the initial or the final part of a file.
As a special case, when the first part of a range pattern is constantly true, e.g. "1", the range will start at the beginning of the input. Similarly, if the second part is constantly false, e.g. "0", the range will continue until the end of input. For example,
/^--cut here--$/, 0
prints lines of input from the first line matching the regular expression "^--cut here--$", that is, a line containing only the phrase "--cut here--", to the end.
Calculate word frequencies.
Word frequency using associative arrays:
BEGIN {
FS="[^a-zA-Z]+"
for (i=1; i<=NF; i++)
words[tolower($i)]++
END {
for (i in words)
print i, words[i]
The BEGIN block sets the field separator to any sequence of non-alphabetic characters. Separators can be regular expressions. After that, we get to a bare action, which performs the action on every input line. In this case, for every field on the line, we add one to the number of times that word, first converted to lowercase, appears. Finally, in the END block, we print the words with their frequencies. The line
for (i in words)
creates a loop that goes through the array "words", setting "i" to each "subscript" of the array. This is different from most languages, where such a loop goes through each "value" in the array. The loop thus prints out each word followed by its frequency count. codice_41 was an addition to the One True awk (see below) made after the book was published.
Match pattern from command line.
This program can be represented in several ways. The first one uses the Bourne shell to make a shell script that does everything. It is the shortest of these methods:
pattern="$1"
shift
awk '/'"$pattern"'/ { print FILENAME ":" $0 }' "$@"
The codice_42 in the awk command is not protected by single quotes so that the shell does expand the variable but it needs to be put in double quotes to properly handle patterns containing spaces. A pattern by itself in the usual way checks to see if the whole line (codice_32) matches. codice_16 contains the current filename. awk has no explicit concatenation operator; two adjacent strings concatenate them. codice_32 expands to the original unchanged input line.
There are alternate ways of writing this. This shell script accesses the environment directly from within awk:
export pattern="$1"
shift
awk '$0 ~ ENVIRON["pattern"] { print FILENAME ":" $0 }' "$@"
This is a shell script that uses codice_46, an array introduced in a newer version of the One True awk after the book was published. The subscript of codice_46 is the name of an environment variable; its result is the variable's value. This is like the getenv function in various standard libraries and POSIX. The shell script makes an environment variable codice_48 containing the first argument, then drops that argument and has awk look for the pattern in each file.
codice_6 checks to see if its left operand matches its right operand; codice_50 is its inverse. A regular expression is just a string and can be stored in variables.
The next way uses command-line variable assignment, in which an argument to awk can be seen as an assignment to a variable:
pattern="$1"
shift
awk '$0 ~ pattern { print FILENAME ":" $0 }' pattern="$pattern" "$@"
Or You can use the "-v var=value" command line option (e.g. "awk -v pattern="$pattern" ...").
Finally, this is written in pure awk, without help from a shell or without the need to know too much about the implementation of the awk script (as the variable assignment on command line one does), but is a bit lengthy:
BEGIN {
pattern = ARGV[1]
for (i = 1; i < ARGC; i++) # remove first argument
ARGV[i] = ARGV[i + 1]
ARGC--
if (ARGC == 1) { # the pattern was the only thing, so force read from standard input (used by book)
ARGC = 2
ARGV[1] = "-"
The codice_4 is necessary not only to extract the first argument, but also to prevent it from being interpreted as a filename after the codice_4 block ends. codice_53, the number of arguments, is always guaranteed to be ≥1, as codice_54 is the name of the command that executed the script, most often the string codice_55. codice_56 is the empty string, codice_57. codice_58 initiates a comment that expands to the end of the line.
Note the codice_59 block. awk only checks to see if it should read from standard input before it runs the command. This means that
awk 'prog'
only works because the fact that there are no filenames is only checked before codice_60 is run! If you explicitly set codice_53 to 1 so that there are no arguments, awk will simply quit because it feels there are no more input files. Therefore, you need to explicitly say to read from standard input with the special filename codice_62.
Self-contained AWK scripts.
On Unix-like operating systems self-contained AWK scripts can be constructed using the shebang syntax.
For example, a script that sends the content of a given file to standard output may be built by creating a file named codice_63 with the following content:
It can be invoked with: codice_64
The codice_65 tells awk that the argument that follows is the file to read the AWK program from, which is the same flag that is used in sed. Since they are often used for one-liners, both these programs default to executing a program given as a command-line argument, rather than a separate file.
Versions and implementations.
AWK was originally written in 1977 and distributed with Version 7 Unix.
In 1985 its authors started expanding the language, most significantly by adding user-defined functions. The language is described in the book "The AWK Programming Language", published 1988, and its implementation was made available in releases of UNIX System V. To avoid confusion with the incompatible older version, this version was sometimes called "new awk" or "nawk". This implementation was released under a free software license in 1996 and is still maintained by Brian Kernighan (see external links below).
Old versions of Unix, such as UNIX/32V, included codice_66, which converted AWK to C. Kernighan wrote a program to turn awk into ; its state is not known.
The gawk manual has a list of more AWK implementations.
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Asgard
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In Nordic mythology, Asgard (Old Norse: Ásgarðr; "Garden of the Æsir") is a location associated with the gods. It appears in several Old Norse sagas and mythological texts, including the Eddas, however it has also been suggested to be referred to indirectly in some of these sources. It is described as the fortified home of the Æsir gods and is often associated with gold imagery and contains many other locations known in Nordic mythology such as Valhöll, Iðavöllr and Hlidskjálf.
In some euhemeristic accounts, Asgard is portrayed as being a city in Asia or Troy, however in other accounts that likely more accurately reflect its conception in Old Norse religion, it is depicted as not conforming to a naturalistic geographical position. In these latter accounts, it is found in a range of locations such as over the rainbow bridge Bifröst, in the middle of the world and over the sea.
Etymology.
The compound word "Ásgarðr" combines Old Norse "" ("god") and ("enclosure"). Possible anglicisations include: Ásgarthr, Ásgard, Ásegard, Ásgardr, Asgardr, Ásgarth, Asgarth, Esageard, and Ásgardhr.
Attestations.
The Poetic Edda.
Asgard is named twice in Eddic poetry. The first case is in "Hymiskviða", when Thor and Týr journey from Asgard to Hymir's hall to obtain a cauldron large enough to brew beer for a feast for Ægir and the gods. The second instance is in "Þrymskviða" when Loki is attempting to convince Thor to dress up as Freyja in order to get back Mjölnir by claiming that without his hammer to protect them, jötnar would soon be living in Asgard.
"Grímnismál" contains among its cosmological descriptions, a number of abodes of the gods, such as Álfheim, Nóatún and Valhalla, which some scholars have identified as being in Asgard. Asgard is not mentioned at any point in the poem. Furthermore, "Völuspá" references Iðavöllr, one of the most common meeting places of Æsir gods, which in "Gylfaginning", Snorri locates in the centre of Asgard.
The Prose Edda.
Prologue.
The Prose Edda's euhemeristic prologue portrays the Æsir gods as people who travelled from the East to northern territories. According to Snorri, Asgard represented the town of Troy before Greek warriors overtook it. After the defeat, Trojans moved to northern Europe, where they became a dominant group due to their "advanced technologies and culture". Eventually, other tribes began to perceive the Trojans and their leader Trór (Thor in Old Norse) as gods.
Gylfaginning.
In "Gylfaginning", Snorri Sturluson describes how during the creation of the world, the gods made the earth and surrounded it with the sea. They made the sky from the skull of Ymir and settled the on the shores of the earth. They set down the brows of Ymir, forming Midgard, and in the centre of the world they built Asgard, which he identifies as Troy:
After Asgard is made, the gods then built a hof named Glaðsheimr at Iðavöllr, in the centre of the burg, or walled city, with a high seat for Odin and twelve seats for other gods. It is described as like gold both on the inside and the outside, and as the best of all buildings in the world. They also built Vingólf for the female gods, which is described as both a hall and a hörgr, and a forge with which they crafted objects from gold. After Ragnarök, some gods such as Váli and Baldr will meet at Iðavöllr where Asgard once stood and discuss matters together. There they will also find in the grass the golden chess pieces that the Æsir had once owned.
Later, the section describes how an unnamed jötunn came to the gods with his stallion, Svaðilfari and offered help in building a burg for the gods in three winters, asking in return for the sun, moon, and marriage with Freyja. Despite Freyja's opposition, together the gods agree to fulfill his request if he completes his work in just one winter. As time goes on, the gods grow desperate as it becomes apparent that the jötunn will construct the burg on time. To their surprise, his stallion contributes much of the progress, swiftly moving boulders and rocks. To deal with the problem, Loki comes up with a plan whereupon he changes his appearance to that of a mare, and distracts Svaðilfari to slow down construction. Without the help of his stallion, the builder realises he cannot complete his task in time and goes into a rage, revealing his identity as a jötunn. Thor then kills the builder with Mjöllnir, before any harm to the gods is done. The chapter does not explicitly name Asgard as the fortress but they are commonly identified by scholars.
In "Gylfaginning", the central cosmic tree Yggdrasil is described as having three roots that hold it up; one of these goes to the Æsir, which has been interpreted as meaning Asgard. In "Grímnismál", this root instead reaches over the realm of men. The bridge Bifröst is told to span from the heavens to the earth and over it the Æsir cross each day to hold council beneath Yggdrasil at the Urðarbrunnr. Based on this, Bifröst is commonly interpreted as the bridge to Asgard.
Skáldskaparmál.
Asgard is mentioned briefly throughout "Skáldskaparmál" as the name for the home of the Æsir, as in "Gylfaginning". In this section, a number of locations are described as lying within Asgard including Valhalla, and in front of its doors, the golden grove Glasir. It also records a name for Thor as 'Defender of Ásgard' ().
Ynglinga Saga.
In the "Ynglinga" saga, found in Heimskringla, Snorri describes Asgard as a city in Asia, based on a perceived, but erroneous, connection between the words for Asia and Æsir. In the opening stanzas of the Saga of the Ynglings, Asgard is the capital of Asaland, a section of Asia east of the river Tana-kvísl or Vana-Kvísl (kvísl is "arm"), which Snorri explains is the river Tanais (now Don), flowing into the Black Sea. Odin then leaves to settle in the northern part of the world and leaves his brothers Vili and Vé to rule over the city. When the euhemerised Odin dies, the account states that the Swedes believed he had returned to Asgard and would live there forever.
Interpretation and discussion.
Cosmology in Old Norse religion is presented in a vague and often contradictory manner when viewed from a naturalistic standpoint. Snorri places Asgard in the centre of the world, surrounded by Midgard and then the lands inhabited by , all of which are finally encircled by the sea. He also locates the homes of the gods in the heavens. This had led to the proposition of a system of concentric circles, centred on Asgard or Yggdrasil, and sometimes with a vertical axis, leading upwards towards the heavens. There is debate between scholars over whether the gods were conceived of as living in the heavens, with some aligning their views with Snorri, and others proposing that he at times presents the system in a Christian framework and that this organisation is not seen in either Eddic or skaldic poetry. The concept of attempting to create a spatial cosmological model has itself been criticised by scholars who argue that the oral traditions did not form a naturalistic, structured system that aimed to be internally geographically consistent. An alternative proposal is that the world should be conceived of as a number of realms connected by passages that cannot be typically traversed. This would explain how Asgard can be located both to the east and west of the realm of men, over the sea and over Bifröst.
It has been noted that the tendency to link Asgard to Troy is part of a wider European cultural practice of claiming Trojan origins for one's culture, first seen in the "Aeneid" and also featuring in Geoffrey of Monmouth's "Historia regum Britanniae" for the founding of Britain.
Depictions in popular culture.
Both Asgard and Valhalla have been portrayed many times in popular culture
In film.
Asgard is depicted in the 1989 film comedy film "Erik the Viking" as a frozen wasteland dominated by the Halls of Valhalla on a high plateau. In the film the Æsir are depicted as spoilt children
In comics.
Thor first appeared in the Marvel Universe within comic series "Journey into Mystery" in the issues #83 during August 1962. Following this release, he becomes one of the central figures in the comics along with Loki and Odin. In the Marvel Cinematic Universe, Thor and Loki make their first appearance together in the 2011 film "Thor". After that, Thor becomes a regular character in the Marvel Cinematic Universe and reappears in several films, including the "Avengers" series. Asgard becomes the central element of the film "", where it is destroyed following the Old Norse mythos. These and other Norse mythology elements also appear in video games, TV series, and books based in and on the Marvel Universe, although these depictions do not closely follow historical sources.
In video games.
Asgard is an explorable realm in the video game "God of War: Ragnarök", a sequel to 2018's Norse-themed "God of War".
In the "Assassin's Creed Valhalla" video game, Asgard is featured as part of a "vision quest".
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Apollo program
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The Apollo program, also known as Project Apollo, was the United States human spaceflight program led by NASA, which landed the first humans on the Moon in 1969. Apollo was conceived during Project Mercury and executed after Project Gemini. It was conceived in 1960 as a three-person spacecraft during President Dwight D. Eisenhower's administration. Apollo was later dedicated to President John F. Kennedy's national goal for the 1960s of "landing a man on the Moon and returning him safely to the Earth" in an address to Congress on May 25, 1961.
Kennedy's goal was accomplished on the Apollo 11 mission when astronauts Neil Armstrong and Buzz Aldrin landed their Apollo Lunar Module (LM) on July 20, 1969, and walked on the lunar surface, while Michael Collins remained in lunar orbit in the command and service module (CSM), and all three landed safely on Earth in the Pacific Ocean on July 24. Five subsequent Apollo missions also landed astronauts on the Moon, the last, Apollo 17, in December 1972. In these six spaceflights, twelve people walked on the Moon.
Apollo ran from 1961 to 1972, with the first crewed flight in 1968. It encountered a major setback in 1967 when the Apollo 1 cabin fire killed the entire crew during a prelaunch test. After the first Moon landing, sufficient flight hardware remained for nine follow-on landings with a plan for extended lunar geological and astrophysical exploration. Budget cuts forced the cancellation of three of these. Five of the remaining six missions achieved landings; but the Apollo 13 landing had to be aborted after an oxygen tank exploded en route to the Moon, crippling the CSM. The crew barely managed a safe return to Earth by using the Lunar Module as a "lifeboat" on the return journey. Apollo used the Saturn family of rockets as launch vehicles, which were also used for an Apollo Applications Program, which consisted of Skylab, a space station that supported three crewed missions in 1973–1974, and the Apollo–Soyuz Test Project, a joint United States-Soviet Union low Earth orbit mission in 1975.
Apollo set several major human spaceflight milestones. It stands alone in sending crewed missions beyond low Earth orbit. Apollo 8 was the first crewed spacecraft to orbit another celestial body, and Apollo 11 was the first crewed spacecraft to land humans on one.
Overall, the Apollo program returned of lunar rocks and soil to Earth, greatly contributing to the understanding of the Moon's composition and geological history. The program laid the foundation for NASA's subsequent human spaceflight capability and funded construction of its Johnson Space Center and Kennedy Space Center. Apollo also spurred advances in many areas of technology incidental to rocketry and human spaceflight, including avionics, telecommunications, and computers.
Name.
The program was named after Apollo, the Greek god of light, music, and the Sun, by NASA manager Abe Silverstein, who later said, "I was naming the spacecraft like I'd name my baby." Silverstein chose the name at home one evening, early in 1960, because he felt "Apollo riding his chariot across the Sun was appropriate to the grand scale of the proposed program".
The context of this was that the program focused at its beginning mainly on developing an advanced crewed spacecraft, the Apollo command and service module, succeeding the Mercury program. A lunar landing became the focus of the program only in 1961. Thereafter Project Gemini instead followed the Mercury program to test and study advanced crewed spaceflight technology.
Background.
Origin and spacecraft feasibility studies.
The Apollo program was conceived during the Eisenhower administration in early 1960, as a follow-up to Project Mercury. While the Mercury capsule could support only one astronaut on a limited Earth orbital mission, Apollo would carry three. Possible missions included ferrying crews to a space station, circumlunar flights, and eventual crewed lunar landings.
In July 1960, NASA Deputy Administrator Hugh L. Dryden announced the Apollo program to industry representatives at a series of Space Task Group conferences. Preliminary specifications were laid out for a spacecraft with a "mission module" cabin separate from the "command module" (piloting and reentry cabin), and a "propulsion and equipment module". On August 30, a feasibility study competition was announced, and on October 25, three study contracts were awarded to General Dynamics/Convair, General Electric, and the Glenn L. Martin Company. Meanwhile, NASA performed its own in-house spacecraft design studies led by Maxime Faget, to serve as a gauge to judge and monitor the three industry designs.
Political pressure builds.
In November 1960, John F. Kennedy was elected president after a campaign that promised American superiority over the Soviet Union in the fields of space exploration and missile defense. Up to the election of 1960, Kennedy had been speaking out against the "missile gap" that he and many other senators said had developed between the Soviet Union and the United States due to the inaction of President Eisenhower. Beyond military power, Kennedy used aerospace technology as a symbol of national prestige, pledging to make the US not "first but, first and, first if, but first period". Despite Kennedy's rhetoric, he did not immediately come to a decision on the status of the Apollo program once he became president. He knew little about the technical details of the space program, and was put off by the massive financial commitment required by a crewed Moon landing. When Kennedy's newly appointed NASA Administrator James E. Webb requested a 30 percent budget increase for his agency, Kennedy supported an acceleration of NASA's large booster program but deferred a decision on the broader issue.
On April 12, 1961, Soviet cosmonaut Yuri Gagarin became the first person to fly in space, reinforcing American fears about being left behind in a technological competition with the Soviet Union. At a meeting of the US House Committee on Science and Astronautics one day after Gagarin's flight, many congressmen pledged their support for a crash program aimed at ensuring that America would catch up. Kennedy was circumspect in his response to the news, refusing to make a commitment on America's response to the Soviets.
On April 20, Kennedy sent a memo to Vice President Lyndon B. Johnson, asking Johnson to look into the status of America's space program, and into programs that could offer NASA the opportunity to catch up. Johnson responded approximately one week later, concluding that "we are neither making maximum effort nor achieving results necessary if this country is to reach a position of leadership." His memo concluded that a crewed Moon landing was far enough in the future that it was likely the United States would achieve it first.
On May 25, 1961, twenty days after the first American crewed spaceflight "Freedom 7", Kennedy proposed the crewed Moon landing in a "Special Message to the Congress on Urgent National Needs":
NASA expansion.
At the time of Kennedy's proposal, only one American had flown in space—less than a month earlier—and NASA had not yet sent an astronaut into orbit. Even some NASA employees doubted whether Kennedy's ambitious goal could be met. By 1963, Kennedy even came close to agreeing to a joint US-USSR Moon mission, to eliminate duplication of effort.
With the clear goal of a crewed landing replacing the more nebulous goals of space stations and circumlunar flights, NASA decided that, in order to make progress quickly, it would discard the feasibility study designs of Convair, GE, and Martin, and proceed with Faget's command and service module design. The mission module was determined to be useful only as an extra room, and therefore unnecessary. They used Faget's design as the specification for another competition for spacecraft procurement bids in October 1961. On November 28, 1961, it was announced that North American Aviation had won the contract, although its bid was not rated as good as the Martin proposal. Webb, Dryden and Robert Seamans chose it in preference due to North American's longer association with NASA and its predecessor.
Landing humans on the Moon by the end of 1969 required the most sudden burst of technological creativity, and the largest commitment of resources ($25 billion; $ in US dollars) ever made by any nation in peacetime. At its peak, the Apollo program employed 400,000 people and required the support of over 20,000 industrial firms and universities.
On July 1, 1960, NASA established the Marshall Space Flight Center (MSFC) in Huntsville, Alabama. MSFC designed the heavy lift-class Saturn launch vehicles, which would be required for Apollo.
Manned Spacecraft Center.
It became clear that managing the Apollo program would exceed the capabilities of Robert R. Gilruth's Space Task Group, which had been directing the nation's crewed space program from NASA's Langley Research Center. So Gilruth was given authority to grow his organization into a new NASA center, the Manned Spacecraft Center (MSC). A site was chosen in Houston, Texas, on land donated by Rice University, and Administrator Webb announced the conversion on September 19, 1961. It was also clear NASA would soon outgrow its practice of controlling missions from its Cape Canaveral Air Force Station launch facilities in Florida, so a new Mission Control Center would be included in the MSC.
In September 1962, by which time two Project Mercury astronauts had orbited the Earth, Gilruth had moved his organization to rented space in Houston, and construction of the MSC facility was under way, Kennedy visited Rice to reiterate his challenge in a famous speech:
The MSC was completed in September 1963. It was renamed by the United States Congress in honor of Lyndon B. Johnson soon after his death in 1973.
Launch Operations Center.
It also became clear that Apollo would outgrow the Canaveral launch facilities in Florida. The two newest launch complexes were already being built for the Saturn I and IB rockets at the northernmost end: LC-34 and LC-37. But an even bigger facility would be needed for the mammoth rocket required for the crewed lunar mission, so land acquisition was started in July 1961 for a Launch Operations Center (LOC) immediately north of Canaveral at Merritt Island. The design, development and construction of the center was conducted by Kurt H. Debus, a member of Wernher von Braun's original V-2 rocket engineering team. Debus was named the LOC's first Director. Construction began in November 1962. Following Kennedy's death, President Johnson issued an executive order on November 29, 1963, to rename the LOC and Cape Canaveral in honor of Kennedy.
The LOC included Launch Complex 39, a Launch Control Center, and a Vertical Assembly Building (VAB). in which the space vehicle (launch vehicle and spacecraft) would be assembled on a mobile launcher platform and then moved by a crawler-transporter to one of several launch pads. Although at least three pads were planned, only two, designated AandB, were completed in October 1965. The LOC also included an Operations and Checkout Building (OCB) to which Gemini and Apollo spacecraft were initially received prior to being mated to their launch vehicles. The Apollo spacecraft could be tested in two vacuum chambers capable of simulating atmospheric pressure at altitudes up to , which is nearly a vacuum.
Organization.
Administrator Webb realized that in order to keep Apollo costs under control, he had to develop greater project management skills in his organization, so he recruited George E. Mueller for a high management job. Mueller accepted, on the condition that he have a say in NASA reorganization necessary to effectively administer Apollo. Webb then worked with Associate Administrator (later Deputy Administrator) Seamans to reorganize the Office of Manned Space Flight (OMSF). On July 23, 1963, Webb announced Mueller's appointment as Deputy Associate Administrator for Manned Space Flight, to replace then Associate Administrator D. Brainerd Holmes on his retirement effective September 1. Under Webb's reorganization, the directors of the Manned Spacecraft Center (Gilruth), Marshall Space Flight Center (von Braun), and the Launch Operations Center (Debus) reported to Mueller.
Based on his industry experience on Air Force missile projects, Mueller realized some skilled managers could be found among high-ranking officers in the U.S. Air Force, so he got Webb's permission to recruit General Samuel C. Phillips, who gained a reputation for his effective management of the Minuteman program, as OMSF program controller. Phillips's superior officer Bernard A. Schriever agreed to loan Phillips to NASA, along with a staff of officers under him, on the condition that Phillips be made Apollo Program Director. Mueller agreed, and Phillips managed Apollo from January 1964, until it achieved the first human landing in July 1969, after which he returned to Air Force duty.
Charles Fishman, in "One Giant Leap", estimated the number of people and organizations involved into the Apollo program as "410,000 men and women at some 20,000 different companies contributed to the effort".
Choosing a mission mode.
Once Kennedy had defined a goal, the Apollo mission planners were faced with the challenge of designing a spacecraft that could meet it while minimizing risk to human life, limiting cost, and not exceeding limits in possible technology and astronaut skill. Four possible mission modes were considered:
In early 1961, direct ascent was generally the mission mode in favor at NASA. Many engineers feared that rendezvous and docking, maneuvers that had not been attempted in Earth orbit, would be nearly impossible in lunar orbit. LOR advocates including John Houbolt at Langley Research Center emphasized the important weight reductions that were offered by the LOR approach. Throughout 1960 and 1961, Houbolt campaigned for the recognition of LOR as a viable and practical option. Bypassing the NASA hierarchy, he sent a series of memos and reports on the issue to Associate Administrator Robert Seamans; while acknowledging that he spoke "somewhat as a voice in the wilderness", Houbolt pleaded that LOR should not be discounted in studies of the question.
Seamans's establishment of an ad hoc committee headed by his special technical assistant Nicholas E. Golovin in July 1961, to recommend a launch vehicle to be used in the Apollo program, represented a turning point in NASA's mission mode decision. This committee recognized that the chosen mode was an important part of the launch vehicle choice, and recommended in favor of a hybrid EOR-LOR mode. Its consideration of LOR—as well as Houbolt's ceaseless work—played an important role in publicizing the workability of the approach. In late 1961 and early 1962, members of the Manned Spacecraft Center began to come around to support LOR, including the newly hired deputy director of the Office of Manned Space Flight, Joseph Shea, who became a champion of LOR. The engineers at Marshall Space Flight Center (MSFC), who were heavily invested in direct ascent, took longer to become convinced of its merits, but their conversion was announced by Wernher von Braun at a briefing on June 7, 1962.
But even after NASA reached internal agreement, it was far from smooth sailing. Kennedy's science advisor Jerome Wiesner, who had expressed his opposition to human spaceflight to Kennedy before the President took office, and had opposed the decision to land people on the Moon, hired Golovin, who had left NASA, to chair his own "Space Vehicle Panel", ostensibly to monitor, but actually to second-guess NASA's decisions on the Saturn V launch vehicle and LOR by forcing Shea, Seamans, and even Webb to defend themselves, delaying its formal announcement to the press on July 11, 1962, and forcing Webb to still hedge the decision as "tentative".
Wiesner kept up the pressure, even making the disagreement public during a two-day September visit by the President to Marshall Space Flight Center. Wiesner blurted out "No, that's no good" in front of the press, during a presentation by von Braun. Webb jumped in and defended von Braun, until Kennedy ended the squabble by stating that the matter was "still subject to final review". Webb held firm and issued a request for proposal to candidate Lunar Excursion Module (LEM) contractors. Wiesner finally relented, unwilling to settle the dispute once and for all in Kennedy's office, because of the President's involvement with the October Cuban Missile Crisis, and fear of Kennedy's support for Webb. NASA announced the selection of Grumman as the LEM contractor in November 1962.
Space historian James Hansen concludes that:
The LOR method had the advantage of allowing the lander spacecraft to be used as a "lifeboat" in the event of a failure of the command ship. Some documents prove this theory was discussed before and after the method was chosen. In 1964 an MSC study concluded, "The LM [as lifeboat]... was finally dropped, because no single reasonable CSM failure could be identified that would prohibit use of the SPS." Ironically, just such a failure happened on Apollo 13 when an oxygen tank explosion left the CSM without electrical power. The lunar module provided propulsion, electrical power and life support to get the crew home safely.
Spacecraft.
Faget's preliminary Apollo design employed a cone-shaped command module, supported by one of several service modules providing propulsion and electrical power, sized appropriately for the space station, cislunar, and lunar landing missions. Once Kennedy's Moon landing goal became official, detailed design began of a command and service module (CSM) in which the crew would spend the entire direct-ascent mission and lift off from the lunar surface for the return trip, after being soft-landed by a larger landing propulsion module. The final choice of lunar orbit rendezvous changed the CSM's role to the translunar ferry used to transport the crew, along with a new spacecraft, the Lunar Excursion Module (LEM, later shortened to LM (Lunar Module) but still pronounced ) which would take two individuals to the lunar surface and return them to the CSM.
Command and service module.
The command module (CM) was the conical crew cabin, designed to carry three astronauts from launch to lunar orbit and back to an Earth ocean landing. It was the only component of the Apollo spacecraft to survive without major configuration changes as the program evolved from the early Apollo study designs. Its exterior was covered with an ablative heat shield, and had its own reaction control system (RCS) engines to control its attitude and steer its atmospheric entry path. Parachutes were carried to slow its descent to splashdown. The module was tall, in diameter, and weighed approximately .
A cylindrical service module (SM) supported the command module, with a service propulsion engine and an RCS with propellants, and a fuel cell power generation system with liquid hydrogen and liquid oxygen reactants. A high-gain S-band antenna was used for long-distance communications on the lunar flights. On the extended lunar missions, an orbital scientific instrument package was carried. The service module was discarded just before reentry. The module was long and in diameter. The initial lunar flight version weighed approximately fully fueled, while a later version designed to carry a lunar orbit scientific instrument package weighed just over .
North American Aviation won the contract to build the CSM, and also the second stage of the Saturn V launch vehicle for NASA. Because the CSM design was started early before the selection of lunar orbit rendezvous, the service propulsion engine was sized to lift the CSM off the Moon, and thus was oversized to about twice the thrust required for translunar flight. Also, there was no provision for docking with the lunar module. A 1964 program definition study concluded that the initial design should be continued as Block I which would be used for early testing, while Block II, the actual lunar spacecraft, would incorporate the docking equipment and take advantage of the lessons learned in Block I development.
Apollo Lunar Module.
The Apollo Lunar Module (LM) was designed to descend from lunar orbit to land two astronauts on the Moon and take them back to orbit to rendezvous with the command module. Not designed to fly through the Earth's atmosphere or return to Earth, its fuselage was designed totally without aerodynamic considerations and was of an extremely lightweight construction. It consisted of separate descent and ascent stages, each with its own engine. The descent stage contained storage for the descent propellant, surface stay consumables, and surface exploration equipment. The ascent stage contained the crew cabin, ascent propellant, and a reaction control system. The initial LM model weighed approximately , and allowed surface stays up to around 34 hours. An extended lunar module (ELM) weighed over , and allowed surface stays of more than three days. The contract for design and construction of the lunar module was awarded to Grumman Aircraft Engineering Corporation, and the project was overseen by Thomas J. Kelly.
Launch vehicles.
Before the Apollo program began, Wernher von Braun and his team of rocket engineers had started work on plans for very large launch vehicles, the Saturn series, and the even larger Nova series. In the midst of these plans, von Braun was transferred from the Army to NASA and was made Director of the Marshall Space Flight Center. The initial direct ascent plan to send the three-person Apollo command and service module directly to the lunar surface, on top of a large descent rocket stage, would require a Nova-class launcher, with a lunar payload capability of over . The June 11, 1962, decision to use lunar orbit rendezvous enabled the Saturn V to replace the Nova, and the MSFC proceeded to develop the Saturn rocket family for Apollo.
Since Apollo, like Mercury, used more than one launch vehicle for space missions, NASA used spacecraft-launch vehicle combination series numbers: AS-10x for Saturn I, AS-20x for Saturn IB, and AS-50x for Saturn V (compare Mercury-Redstone 3, Mercury-Atlas 6) to designate and plan all missions, rather than numbering them sequentially as in Project Gemini. This was changed by the time human flights began.
Little Joe II.
Since Apollo, like Mercury, would require a launch escape system (LES) in case of a launch failure, a relatively small rocket was required for qualification flight testing of this system. A rocket bigger than the Little Joe used by Mercury would be required, so the Little Joe II was built by General Dynamics/Convair. After an August 1963 qualification test flight, four LES test flights (A-001 through 004) were made at the White Sands Missile Range between May 1964 and January 1966.
Saturn I.
Saturn I, the first US heavy lift launch vehicle, was initially planned to launch partially equipped CSMs in low Earth orbit tests. The S-I first stage burned RP-1 with liquid oxygen (LOX) oxidizer in eight clustered Rocketdyne H-1 engines, to produce of thrust. The S-IV second stage used six liquid hydrogen-fueled Pratt & Whitney RL-10 engines with of thrust. The S-V third stage flew inactively on Saturn I four times.
The first four Saturn I test flights were launched from LC-34, with only the first stage live, carrying dummy upper stages filled with water. The first flight with a live S-IV was launched from LC-37. This was followed by five launches of boilerplate CSMs (designated AS-101 through AS-105) into orbit in 1964 and 1965. The last three of these further supported the Apollo program by also carrying Pegasus satellites, which verified the safety of the translunar environment by measuring the frequency and severity of micrometeorite impacts.
In September 1962, NASA planned to launch four crewed CSM flights on the Saturn I from late 1965 through 1966, concurrent with Project Gemini. The payload capacity would have severely limited the systems which could be included, so the decision was made in October 1963 to use the uprated Saturn IB for all crewed Earth orbital flights.
Saturn IB.
The Saturn IB was an upgraded version of the Saturn I. The S-IB first stage increased the thrust to by uprating the H-1 engine. The second stage replaced the S-IV with the S-IVB-200, powered by a single J-2 engine burning liquid hydrogen fuel with LOX, to produce of thrust. A restartable version of the S-IVB was used as the third stage of the Saturn V. The Saturn IB could send over into low Earth orbit, sufficient for a partially fueled CSM or the LM. Saturn IB launch vehicles and flights were designated with an AS-200 series number, "AS" indicating "Apollo Saturn" and the "2" indicating the second member of the Saturn rocket family.
Saturn V.
Saturn V launch vehicles and flights were designated with an AS-500 series number, "AS" indicating "Apollo Saturn" and the "5" indicating Saturn V. The three-stage Saturn V was designed to send a fully fueled CSM and LM to the Moon. It was in diameter and stood tall with its lunar payload. Its capability grew to for the later advanced lunar landings. The S-IC first stage burned RP-1/LOX for a rated thrust of , which was upgraded to . The second and third stages burned liquid hydrogen; the third stage was a modified version of the S-IVB, with thrust increased to and capability to restart the engine for translunar injection after reaching a parking orbit.
Astronauts.
NASA's director of flight crew operations during the Apollo program was Donald K. "Deke" Slayton, one of the original Mercury Seven astronauts who was medically grounded in September 1962 due to a heart murmur. Slayton was responsible for making all Gemini and Apollo crew assignments.
Thirty-two astronauts were assigned to fly missions in the Apollo program. Twenty-four of these left Earth's orbit and flew around the Moon between December 1968 and December 1972 (three of them twice). Half of the 24 walked on the Moon's surface, though none of them returned to it after landing once. One of the moonwalkers was a trained geologist. Of the 32, Gus Grissom, Ed White, and Roger Chaffee were killed during a ground test in preparation for the Apollo 1 mission.
The Apollo astronauts were chosen from the Project Mercury and Gemini veterans, plus from two later astronaut groups. All missions were commanded by Gemini or Mercury veterans. Crews on all development flights (except the Earth orbit CSM development flights) through the first two landings on Apollo 11 and Apollo 12, included at least two (sometimes three) Gemini veterans. Harrison Schmitt, a geologist, was the first NASA scientist astronaut to fly in space, and landed on the Moon on the last mission, Apollo 17. Schmitt participated in the lunar geology training of all of the Apollo landing crews.
NASA awarded all 32 of these astronauts its highest honor, the Distinguished Service Medal, given for "distinguished service, ability, or courage", and personal "contribution representing substantial progress to the NASA mission". The medals were awarded posthumously to Grissom, White, and Chaffee in 1969, then to the crews of all missions from Apollo 8 onward. The crew that flew the first Earth orbital test mission Apollo 7, Walter M. Schirra, Donn Eisele, and Walter Cunningham, were awarded the lesser NASA Exceptional Service Medal, because of discipline problems with the flight director's orders during their flight. In October 2008, the NASA Administrator decided to award them the Distinguished Service Medals. For Schirra and Eisele, this was posthumously.
Lunar mission profile.
The first lunar landing mission was planned to proceed:
Development history.
Uncrewed flight tests.
Two Block I CSMs were launched from LC-34 on suborbital flights in 1966 with the Saturn IB. The first, AS-201 launched on February 26, reached an altitude of and splashed down downrange in the Atlantic Ocean. The second, AS-202 on August 25, reached altitude and was recovered downrange in the Pacific Ocean. These flights validated the service module engine and the command module heat shield.
A third Saturn IB test, AS-203 launched from pad 37, went into orbit to support design of the S-IVB upper stage restart capability needed for the Saturn V. It carried a nose cone instead of the Apollo spacecraft, and its payload was the unburned liquid hydrogen fuel, the behavior of which engineers measured with temperature and pressure sensors, and a TV camera. This flight occurred on July 5, before AS-202, which was delayed because of problems getting the Apollo spacecraft ready for flight.
Preparation for crewed flight.
Two crewed orbital Block I CSM missions were planned: AS-204 and AS-205. The Block I crew positions were titled Command Pilot, Senior Pilot, and Pilot. The Senior Pilot would assume navigation duties, while the Pilot would function as a systems engineer. The astronauts would wear a modified version of the Gemini spacesuit.
After an uncrewed LM test flight AS-206, a crew would fly the first Block II CSM and LM in a dual mission known as AS-207/208, or AS-278 (each spacecraft would be launched on a separate Saturn IB). The Block II crew positions were titled Commander, Command Module Pilot, and Lunar Module Pilot. The astronauts would begin wearing a new Apollo A6L spacesuit, designed to accommodate lunar extravehicular activity (EVA). The traditional visor helmet was replaced with a clear "fishbowl" type for greater visibility, and the lunar surface EVA suit would include a water-cooled undergarment.
Deke Slayton, the grounded Mercury astronaut who became director of flight crew operations for the Gemini and Apollo programs, selected the first Apollo crew in January 1966, with Grissom as Command Pilot, White as Senior Pilot, and rookie Donn F. Eisele as Pilot. But Eisele dislocated his shoulder twice aboard the KC135 weightlessness training aircraft, and had to undergo surgery on January 27. Slayton replaced him with Chaffee. NASA announced the final crew selection for AS-204 on March 21, 1966, with the backup crew consisting of Gemini veterans James McDivitt and David Scott, with rookie Russell L. "Rusty" Schweickart. Mercury/Gemini veteran Wally Schirra, Eisele, and rookie Walter Cunningham were announced on September 29 as the prime crew for AS-205.
In December 1966, the AS-205 mission was canceled, since the validation of the CSM would be accomplished on the 14-day first flight, and AS-205 would have been devoted to space experiments and contribute no new engineering knowledge about the spacecraft. Its Saturn IB was allocated to the dual mission, now redesignated AS-205/208 or AS-258, planned for August 1967. McDivitt, Scott and Schweickart were promoted to the prime AS-258 crew, and Schirra, Eisele and Cunningham were reassigned as the Apollo1 backup crew.
Program delays.
The spacecraft for the AS-202 and AS-204 missions were delivered by North American Aviation to the Kennedy Space Center with long lists of equipment problems which had to be corrected before flight; these delays caused the launch of AS-202 to slip behind AS-203, and eliminated hopes the first crewed mission might be ready to launch as soon as November 1966, concurrently with the last Gemini mission. Eventually, the planned AS-204 flight date was pushed to February 21, 1967.
North American Aviation was prime contractor not only for the Apollo CSM, but for the SaturnV S-II second stage as well, and delays in this stage pushed the first uncrewed SaturnV flight AS-501 from late 1966 to November 1967. (The initial assembly of AS-501 had to use a dummy spacer spool in place of the stage.)
The problems with North American were severe enough in late 1965 to cause Manned Space Flight Administrator George Mueller to appoint program director Samuel Phillips to head a "tiger team" to investigate North American's problems and identify corrections. Phillips documented his findings in a December 19 letter to NAA president Lee Atwood, with a strongly worded letter by Mueller, and also gave a presentation of the results to Mueller and Deputy Administrator Robert Seamans. Meanwhile, Grumman was also encountering problems with the Lunar Module, eliminating hopes it would be ready for crewed flight in 1967, not long after the first crewed CSM flights.
Apollo 1 fire.
Grissom, White, and Chaffee decided to name their flight Apollo1 as a motivational focus on the first crewed flight. They trained and conducted tests of their spacecraft at North American, and in the altitude chamber at the Kennedy Space Center. A "plugs-out" test was planned for January, which would simulate a launch countdown on LC-34 with the spacecraft transferring from pad-supplied to internal power. If successful, this would be followed by a more rigorous countdown simulation test closer to the February 21 launch, with both spacecraft and launch vehicle fueled.
The plugs-out test began on the morning of January 27, 1967, and immediately was plagued with problems. First, the crew noticed a strange odor in their spacesuits which delayed the sealing of the hatch. Then, communications problems frustrated the astronauts and forced a hold in the simulated countdown. During this hold, an electrical fire began in the cabin and spread quickly in the high pressure, 100% oxygen atmosphere. Pressure rose high enough from the fire that the cabin inner wall burst, allowing the fire to erupt onto the pad area and frustrating attempts to rescue the crew. The astronauts were asphyxiated before the hatch could be opened.
NASA immediately convened an accident review board, overseen by both houses of Congress. While the determination of responsibility for the accident was complex, the review board concluded that "deficiencies existed in command module design, workmanship and quality control". At the insistence of NASA Administrator Webb, North American removed Harrison Storms as command module program manager. Webb also reassigned Apollo Spacecraft Program Office (ASPO) Manager Joseph Francis Shea, replacing him with George Low.
To remedy the causes of the fire, changes were made in the Block II spacecraft and operational procedures, the most important of which were use of a nitrogen/oxygen mixture instead of pure oxygen before and during launch, and removal of flammable cabin and space suit materials. The Block II design already called for replacement of the Block I plug-type hatch cover with a quick-release, outward opening door. NASA discontinued the crewed Block I program, using the BlockI spacecraft only for uncrewed SaturnV flights. Crew members would also exclusively wear modified, fire-resistant A7L Block II space suits, and would be designated by the Block II titles, regardless of whether a LM was present on the flight or not.
Uncrewed Saturn V and LM tests.
On April 24, 1967, Mueller published an official Apollo mission numbering scheme, using sequential numbers for all flights, crewed or uncrewed. The sequence would start with Apollo 4 to cover the first three uncrewed flights while retiring the Apollo1 designation to honor the crew, per their widows' wishes.
In September 1967, Mueller approved a sequence of mission types which had to be accomplished in order to achieve the crewed lunar landing. Each step had to be accomplished before the next ones could be performed, and it was unknown how many tries of each mission would be necessary; therefore letters were used instead of numbers. The A missions were uncrewed Saturn V validation; B was uncrewed LM validation using the Saturn IB; C was crewed CSM Earth orbit validation using the Saturn IB; D was the first crewed CSM/LM flight (this replaced AS-258, using a single Saturn V launch); E would be a higher Earth orbit CSM/LM flight; F would be the first lunar mission, testing the LM in lunar orbit but without landing (a "dress rehearsal"); and G would be the first crewed landing. The list of types covered follow-on lunar exploration to include H lunar landings, I for lunar orbital survey missions, and J for extended-stay lunar landings.
The delay in the CSM caused by the fire enabled NASA to catch up on human-rating the LM and SaturnV. Apollo4 (AS-501) was the first uncrewed flight of the SaturnV, carrying a BlockI CSM on November 9, 1967. The capability of the command module's heat shield to survive a trans-lunar reentry was demonstrated by using the service module engine to ram it into the atmosphere at higher than the usual Earth-orbital reentry speed.
Apollo 5 (AS-204) was the first uncrewed test flight of the LM in Earth orbit, launched from pad 37 on January 22, 1968, by the Saturn IB that would have been used for Apollo 1. The LM engines were successfully test-fired and restarted, despite a computer programming error, which cut short the first descent stage firing. The ascent engine was fired in abort mode, known as a "fire-in-the-hole" test, where it was lit simultaneously with jettison of the descent stage. Although Grumman wanted a second uncrewed test, George Low decided the next LM flight would be crewed.
This was followed on April 4, 1968, by Apollo 6 (AS-502) which carried a CSM and a LM Test Article as ballast. The intent of this mission was to achieve trans-lunar injection, followed closely by a simulated direct-return abort, using the service module engine to achieve another high-speed reentry. The Saturn V experienced pogo oscillation, a problem caused by non-steady engine combustion, which damaged fuel lines in the second and third stages. Two S-II engines shut down prematurely, but the remaining engines were able to compensate. The damage to the third stage engine was more severe, preventing it from restarting for trans-lunar injection. Mission controllers were able to use the service module engine to essentially repeat the flight profile of Apollo 4. Based on the good performance of Apollo6 and identification of satisfactory fixes to the Apollo6 problems, NASA declared the SaturnV ready to fly crew, canceling a third uncrewed test.
Crewed development missions.
Apollo 7, launched from LC-34 on October 11, 1968, was the Cmission, crewed by Schirra, Eisele, and Cunningham. It was an 11-day Earth-orbital flight which tested the CSM systems.
Apollo 8 was planned to be the D mission in December 1968, crewed by McDivitt, Scott and Schweickart, launched on a SaturnV instead of two Saturn IBs. In the summer it had become clear that the LM would not be ready in time. Rather than waste the Saturn V on another simple Earth-orbiting mission, ASPO Manager George Low suggested the bold step of sending Apollo8 to orbit the Moon instead, deferring the Dmission to the next mission in March 1969, and eliminating the E mission. This would keep the program on track. The Soviet Union had sent two tortoises, mealworms, wine flies, and other lifeforms around the Moon on September 15, 1968, aboard Zond 5, and it was believed they might soon repeat the feat with human cosmonauts. The decision was not announced publicly until completion of Apollo 7. Gemini veterans Frank Borman and Jim Lovell, and rookie William Anders captured the world's attention by making ten lunar orbits in 20 hours, transmitting television pictures of the lunar surface on Christmas Eve, and returning safely to Earth.
The following March, LM flight, rendezvous and docking were demonstrated in Earth orbit on Apollo 9, and Schweickart tested the full lunar EVA suit with its portable life support system (PLSS) outside the LM. The F mission was carried out on Apollo 10 in May 1969 by Gemini veterans Thomas P. Stafford, John Young and Eugene Cernan. Stafford and Cernan took the LM to within of the lunar surface.
The G mission was achieved on Apollo 11 in July 1969 by an all-Gemini veteran crew consisting of Neil Armstrong, Michael Collins and Buzz Aldrin. Armstrong and Aldrin performed the first landing at the Sea of Tranquility at 20:17:40 UTC on July 20, 1969. They spent a total of 21 hours, 36 minutes on the surface, and spent 2hours, 31 minutes outside the spacecraft, walking on the surface, taking photographs, collecting material samples, and deploying automated scientific instruments, while continuously sending black-and-white television back to Earth. The astronauts returned safely on July 24.
Production lunar landings.
In November 1969, Charles "Pete" Conrad became the third person to step onto the Moon, which he did while speaking more informally than had Armstrong:
Conrad and rookie Alan L. Bean made a precision landing of Apollo 12 within walking distance of the Surveyor 3 uncrewed lunar probe, which had landed in April 1967 on the Ocean of Storms. The command module pilot was Gemini veteran Richard F. Gordon Jr. Conrad and Bean carried the first lunar surface color television camera, but it was damaged when accidentally pointed into the Sun. They made two EVAs totaling 7hours and 45 minutes. On one, they walked to the Surveyor, photographed it, and removed some parts which they returned to Earth.
The contracted batch of 15 Saturn Vs was enough for lunar landing missions through Apollo 20. Shortly after Apollo 11, NASA publicized a preliminary list of eight more planned landing sites after Apollo 12, with plans to increase the mass of the CSM and LM for the last five missions, along with the payload capacity of the Saturn V. These final missions would combine the I and J types in the 1967 list, allowing the CMP to operate a package of lunar orbital sensors and cameras while his companions were on the surface, and allowing them to stay on the Moon for over three days. These missions would also carry the Lunar Roving Vehicle (LRV) increasing the exploration area and allowing televised liftoff of the LM. Also, the Block II spacesuit was revised for the extended missions to allow greater flexibility and visibility for driving the LRV.
The success of the first two landings allowed the remaining missions to be crewed with a single veteran as commander, with two rookies. Apollo 13 launched Lovell, Jack Swigert, and Fred Haise in April 1970, headed for the Fra Mauro formation. But two days out, a liquid oxygen tank exploded, disabling the service module and forcing the crew to use the LM as a "lifeboat" to return to Earth. Another NASA review board was convened to determine the cause, which turned out to be a combination of damage of the tank in the factory, and a subcontractor not making a tank component according to updated design specifications. Apollo was grounded again, for the remainder of 1970 while the oxygen tank was redesigned and an extra one was added.
Mission cutbacks.
About the time of the first landing in 1969, it was decided to use an existing Saturn V to launch the Skylab orbital laboratory pre-built on the ground, replacing the original plan to construct it in orbit from several Saturn IB launches; this eliminated Apollo 20. NASA's yearly budget also began to shrink in light of the landing, and NASA also had to make funds available for the development of the upcoming Space Shuttle. By 1971, the decision was made to also cancel missions 18 and 19. The two unused Saturn Vs became museum exhibits at the John F. Kennedy Space Center on Merritt Island, Florida, George C. Marshall Space Center in Huntsville, Alabama, Michoud Assembly Facility in New Orleans, Louisiana, and Lyndon B. Johnson Space Center in Houston, Texas.
The cutbacks forced mission planners to reassess the original planned landing sites in order to achieve the most effective geological sample and data collection from the remaining four missions. Apollo 15 had been planned to be the last of the H series missions, but since there would be only two subsequent missions left, it was changed to the first of three J missions.
Apollo 13's Fra Mauro mission was reassigned to Apollo 14, commanded in February 1971 by Mercury veteran Alan Shepard, with Stuart Roosa and Edgar Mitchell. This time the mission was successful. Shepard and Mitchell spent 33 hours and 31 minutes on the surface, and completed two EVAs totalling 9hours 24 minutes, which was a record for the longest EVA by a lunar crew at the time.
In August 1971, just after conclusion of the Apollo 15 mission, President Richard Nixon proposed canceling the two remaining lunar landing missions, Apollo 16 and 17. Office of Management and Budget Deputy Director Caspar Weinberger was opposed to this, and persuaded Nixon to keep the remaining missions.
Extended missions.
Apollo 15 was launched on July 26, 1971, with David Scott, Alfred Worden and James Irwin. Scott and Irwin landed on July 30 near Hadley Rille, and spent just under two days, 19 hours on the surface. In over 18 hours of EVA, they collected about of lunar material.
Apollo 16 landed in the Descartes Highlands on April 20, 1972. The crew was commanded by John Young, with Ken Mattingly and Charles Duke. Young and Duke spent just under three days on the surface, with a total of over 20 hours EVA.
Apollo 17 was the last of the Apollo program, landing in the Taurus–Littrow region in December 1972. Eugene Cernan commanded Ronald E. Evans and NASA's first scientist-astronaut, geologist Harrison H. Schmitt. Schmitt was originally scheduled for Apollo 18, but the lunar geological community lobbied for his inclusion on the final lunar landing. Cernan and Schmitt stayed on the surface for just over three days and spent just over 23 hours of total EVA.
Canceled missions.
Several missions were planned for but were canceled before details were finalized.
Mission summary.
Source: "Apollo by the Numbers: A Statistical Reference" (Orloff 2004).
Samples returned.
The Apollo program returned over of lunar rocks and soil to the Lunar Receiving Laboratory in Houston. Today, 75% of the samples are stored at the Lunar Sample Laboratory Facility built in 1979.
The rocks collected from the Moon are extremely old compared to rocks found on Earth, as measured by radiometric dating techniques. They range in age from about 3.2 billion years for the basaltic samples derived from the lunar maria, to about 4.6 billion years for samples derived from the highlands crust. As such, they represent samples from a very early period in the development of the Solar System, that are largely absent on Earth. One important rock found during the Apollo Program is dubbed the Genesis Rock, retrieved by astronauts David Scott and James Irwin during the Apollo 15 mission. This anorthosite rock is composed almost exclusively of the calcium-rich feldspar mineral anorthite, and is believed to be representative of the highland crust. A geochemical component called KREEP was discovered by Apollo 12, which has no known terrestrial counterpart. KREEP and the anorthositic samples have been used to infer that the outer portion of the Moon was once completely molten (see lunar magma ocean).
Almost all the rocks show evidence of impact process effects. Many samples appear to be pitted with micrometeoroid impact craters, which is never seen on Earth rocks, due to the thick atmosphere. Many show signs of being subjected to high-pressure shock waves that are generated during impact events. Some of the returned samples are of "impact melt" (materials melted near an impact crater.) All samples returned from the Moon are highly brecciated as a result of being subjected to multiple impact events.
From analyses of the composition of the returned lunar samples, it is now believed that the Moon was created through the impact of a large astronomical body with Earth.
Costs.
Apollo cost $25.4 billion or approximately $257 billion (2023) using improved cost analysis.
Of this amount, $20.2 billion ($ adjusted) was spent on the design, development, and production of the Saturn family of launch vehicles, the Apollo spacecraft, spacesuits, scientific experiments, and mission operations. The cost of constructing and operating Apollo-related ground facilities, such as the NASA human spaceflight centers and the global tracking and data acquisition network, added an additional $5.2 billion ($ adjusted).
The amount grows to $28 billion ($280 billion adjusted) if the costs for related projects such as Project Gemini and the robotic Ranger, Surveyor, and Lunar Orbiter programs are included.
NASA's official cost breakdown, as reported to Congress in the Spring of 1973, is as follows:
Accurate estimates of human spaceflight costs were difficult in the early 1960s, as the capability was new and management experience was lacking. Preliminary cost analysis by NASA estimated $7 billion – $12 billion for a crewed lunar landing effort. NASA Administrator James Webb increased this estimate to $20 billion before reporting it to Vice President Johnson in April 1961.
Project Apollo was a massive undertaking, representing the largest research and development project in peacetime. At its peak, it employed over 400,000 employees and contractors around the country and accounted for more than half of NASA's total spending in the 1960s. After the first Moon landing, public and political interest waned, including that of President Nixon, who wanted to rein in federal spending. NASA's budget could not sustain Apollo missions which cost, on average, $445 million ($ adjusted) each while simultaneously developing the Space Shuttle. The final fiscal year of Apollo funding was 1973.
Apollo Applications Program.
Looking beyond the crewed lunar landings, NASA investigated several post-lunar applications for Apollo hardware. The Apollo Extension Series ("Apollo X") proposed up to 30 flights to Earth orbit, using the space in the Spacecraft Lunar Module Adapter (SLA) to house a small orbital laboratory (workshop). Astronauts would continue to use the CSM as a ferry to the station. This study was followed by design of a larger orbital workshop to be built in orbit from an empty S-IVB Saturn upper stage and grew into the Apollo Applications Program (AAP). The workshop was to be supplemented by the Apollo Telescope Mount, which could be attached to the ascent stage of the lunar module via a rack. The most ambitious plan called for using an empty S-IVB as an interplanetary spacecraft for a Venus fly-by mission.
The S-IVB orbital workshop was the only one of these plans to make it off the drawing board. Dubbed Skylab, it was assembled on the ground rather than in space, and launched in 1973 using the two lower stages of a Saturn V. It was equipped with an Apollo Telescope Mount. Skylab's last crew departed the station on February 8, 1974, and the station itself re-entered the atmosphere in 1979 after development of the Space Shuttle was delayed too long to save it.
The Apollo–Soyuz program also used Apollo hardware for the first joint nation spaceflight, paving the way for future cooperation with other nations in the Space Shuttle and International Space Station programs.
Recent observations.
In 2008, Japan Aerospace Exploration Agency's SELENE probe observed evidence of the halo surrounding the Apollo 15 Lunar Module blast crater while orbiting above the lunar surface.
Beginning in 2009, NASA's robotic Lunar Reconnaissance Orbiter, while orbiting above the Moon, photographed the remnants of the Apollo program left on the lunar surface, and each site where crewed Apollo flights landed. All of the U.S. flags left on the Moon during the Apollo missions were found to still be standing, with the exception of the one left during the Apollo 11 mission, which was blown over during that mission's lift-off from the lunar surface; the degree to which these flags retain their original colors remains unknown. The flags cannot be seen through a telescope from Earth.
In a November 16, 2009, editorial, "The New York Times" opined:
Legacy.
Science and engineering.
The Apollo program has been described as the greatest technological achievement in human history. Apollo stimulated many areas of technology, leading to over 1,800 spinoff products as of 2015, including advances in the development of cordless power tools, fireproof materials, heart monitors, solar panels, digital imaging, and the use of liquid methane as fuel. The flight computer design used in both the lunar and command modules was, along with the Polaris and Minuteman missile systems, the driving force behind early research into integrated circuits (ICs). By 1963, Apollo was using 60 percent of the United States' production of ICs. The crucial difference between the requirements of Apollo and the missile programs was Apollo's much greater need for reliability. While the Navy and Air Force could work around reliability problems by deploying more missiles, the political and financial cost of failure of an Apollo mission was unacceptably high.
Technologies and techniques required for Apollo were developed by Project Gemini. The Apollo project was enabled by NASA's adoption of new advances in semiconductor electronic technology, including metal–oxide–semiconductor field-effect transistors (MOSFETs) in the Interplanetary Monitoring Platform (IMP) and silicon integrated circuit chips in the Apollo Guidance Computer (AGC).
Cultural impact.
The crew of Apollo 8 sent the first live televised pictures of the Earth and the Moon back to Earth, and read from the creation story in the Book of Genesis, on Christmas Eve 1968. An estimated one-quarter of the population of the world saw—either live or delayed—the Christmas Eve transmission during the ninth orbit of the Moon, and an estimated one-fifth of the population of the world watched the live transmission of the Apollo 11 moonwalk.
The Apollo program also affected environmental activism in the 1970s due to photos taken by the astronauts. The most well known include "Earthrise", taken by William Anders on Apollo 8, and "The Blue Marble", taken by the Apollo 17 astronauts. "The Blue Marble" was released during a surge in environmentalism, and became a symbol of the environmental movement as a depiction of Earth's frailty, vulnerability, and isolation amid the vast expanse of space.
According to "The Economist", Apollo succeeded in accomplishing President Kennedy's goal of taking on the Soviet Union in the Space Race by accomplishing a singular and significant achievement, to demonstrate the superiority of the free-market system. The publication noted the irony that in order to achieve the goal, the program required the organization of tremendous public resources within a vast, centralized government bureaucracy.
Apollo 11 broadcast data restoration project.
Prior to Apollo 11's 40th anniversary in 2009, NASA searched for the original videotapes of the mission's live televised moonwalk. After an exhaustive three-year search, it was concluded that the tapes had probably been erased and reused. A new digitally remastered version of the best available broadcast television footage was released instead.
Depictions on film.
Documentaries.
Numerous documentary films cover the Apollo program and the Space Race, including:
Docudramas.
Some missions have been dramatized:
Fictional.
The Apollo program has been the focus of several works of fiction, including:
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Assault
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In the terminology of law, an assault is the act of causing physical harm or unwanted physical contact to another person, or, in some legal definitions, the threat or attempt to do so. It is both a crime and a tort and, therefore, may result in criminal prosecution, civil liability, or both. Additionally, assault is a criminal act in which a person intentionally causes fear of physical harm or offensive contact to another person. Assault can be committed with or without a weapon and can range from physical violence to threats of violence. Assault is frequently referred to as an attempt to commit battery, which is the deliberate use of physical force against another person. The deliberate inflicting of fear, apprehension, or terror is another definition of assault that can be found in several legal systems. Depending on the severity of the offense, assault may result in a fine, imprisonment, or even death.
Generally, the common law definition is the same in criminal and tort law.
Traditionally, common law legal systems have separate definitions for assault and battery. When this distinction is observed, battery refers to the actual bodily contact, whereas assault refers to a credible threat or attempt to cause battery. Some jurisdictions combined the two offenses into a single crime called "assault and battery", which then became widely referred to as "assault". The result is that in many of these jurisdictions, assault has taken on a definition that is more in line with the traditional definition of battery. The legal systems of civil law and Scots law have never distinguished assault from battery.
Legal systems generally acknowledge that assaults can vary greatly in severity. In the United States, an assault can be charged as either a misdemeanor or a felony. In England and Wales and Australia, it can be charged as either common assault, assault occasioning actual bodily harm (ABH) or grievous bodily harm (GBH). Canada also has a three-tier system: assault, assault causing bodily harm and aggravated assault. Separate charges typically exist for sexual assaults, affray and assaulting a police officer. Assault may overlap with an attempted crime; for example, an assault may be charged as attempted murder if it was done with intent to kill.
Related definitions.
Battery.
Battery is a criminal offense that involves the use of physical force against another person without their consent. It is a type of assault and is considered a serious crime. Battery can include a wide range of actions, from slapping someone to causing serious harm or even death. Depending on the severity of the offense, it can carry a wide range of punishments, including jail time, fines, and probation.
In jurisdictions that make a distinction between the two, assault usually accompanies battery if the assailant both threatens to make unwanted contact and then carries through with this threat. See common assault. The elements of battery are that it is a volitional act, done for the purpose of causing a harmful or offensive contact with another person or under circumstances that make such contact substantially certain to occur, and which causes such contact.
Aggravated assault.
Aggravated assault is a violent crime that involves violence or the threat of violence. It is generally described as an intentional act that causes another person to fear imminent physical harm or injury. This can include the use of a weapon, or the threat of using a weapon. It is usually considered a felony offense and can carry severe penalties. Aggravated assault is often considered a very serious crime and can lead to long-term prison sentences.
Aggravated assault is, in some jurisdictions, a stronger form of assault, usually using a deadly weapon. A person has committed an aggravated assault when that person attempts to:
Aggravated assault can also be charged in cases of attempted harm against police officers or other public servants.
Defenses.
Although the range and precise application of defenses varies between jurisdictions, the following represents a list of the defenses that may apply to all levels of assault:
Consent.
Exceptions exist to cover unsolicited physical contact which amount to normal social behavior known as de minimis harm. Assault can also be considered in cases involving the spitting on or unwanted exposure of bodily fluids to others.
Consent may be a complete or partial defense to assault. In some jurisdictions, most notably England, it is not a defense where the degree of injury is severe, as long as there is no legally recognized good reason for the assault. This can have important consequences when dealing with issues such as consensual sadomasochistic sexual activity, the most notable case being the Operation Spanner case. Legally recognized good reasons for consent include surgery, activities within the rules of a game (mixed martial arts, wrestling, boxing, or contact sports), bodily adornment ("R v Wilson" [1996] Crim LR 573), or horseplay ("R v Jones" [1987] Crim LR 123). However, any activity outside the rules of the game is not legally recognized as a defense of consent. In Scottish law, consent is not a defense for assault.
Arrest and other official acts.
Police officers and court officials have a general power to use force for the purpose of performing an arrest or generally carrying out their official duties. Thus, a court officer taking possession of goods under a court order may use force if reasonably necessary.
Punishment.
In some jurisdictions such as Singapore, judicial corporal punishment is part of the legal system. The officers who administer the punishment have immunity from prosecution for assault.
In the United States, England, Northern Ireland, Australia and Canada, corporal punishment administered to children by their parent or legal guardian is not legally considered to be assault unless it is deemed to be excessive or unreasonable. What constitutes "reasonable" varies in both statutory law and case law. Unreasonable physical punishment may be charged as assault or under a separate statute for child abuse.
In English law, s. 58 Children Act 2004 limits the availability of the lawful correction defense to common assault. This defence was abolished in Wales in 2022.
Many countries, including some US states, also permit the use of controversial corporal punishment for children in school or home.
Prevention of crime.
This may or may not involve self-defense in that, using a reasonable degree of force to prevent another from committing a crime could involve preventing an assault, but it could be preventing a crime not involving the use of personal violence.
Defense of property.
Some jurisdictions allow force to be used in defense of property, to prevent damage either in its own right, or under one or both of the preceding classes of defense in that a threat or attempt to damage property might be considered a crime (in English law, under s5 Criminal Damage Act 1971 it may be argued that the defendant has a "lawful excuse" to damage property during the defense and a defense under s3 Criminal Law Act 1967) subject to the need to deter vigilantes and excessive self-help. Furthermore, some jurisdictions, such as Ohio, allow residents in their homes to use force when ejecting an intruder. The resident merely needs to assert to the court that they felt threatened by the intruder's presence.
By country.
Statistics.
The below table shows the rate of reported serious assault for individual countries according to United Nations Office on Drugs and Crime for the last available year.
Australia.
The term 'assault', when used in legislation, commonly refers to both common assault and battery, even though the two offences remain distinct. Common assault involves intentionally or recklessly causing a person to apprehend the imminent infliction of unlawful force, whilst battery refers to the actual infliction of force.
Each state has legislation relating to the act of assault, and offences against the act that constitute assault are heard in the magistrates' court of that state or indictable offences are heard in a district or supreme court of that state. The legislation that defines assault of each state outline what the elements are that make up the assault, where the assault is sectioned in legislation or criminal codes, and the penalties that apply for the offence of assault.
In New South Wales, the Crimes Act 1900 defines a range of assault offences deemed more serious than common assault and which attract heavier penalties. These include:
Canada.
Assault is an offence under s. 265 of the Canadian Criminal Code. There is a wide range of the types of assault that can occur. Generally, an assault occurs when a person directly or indirectly applies force intentionally to another person without their consent. It can also occur when a person attempts to apply such force, or threatens to do so, without the consent of the other person. An injury need not occur for an assault to be committed, but the force used in the assault must be offensive in nature with an intention to apply force. It can be an assault to "tap", "pinch", "push", or direct another such minor action toward another, but an accidental application of force is not an assault.
The potential punishment for an assault in Canada varies depending on the manner in which the charge proceeds through the court system and the type of assault that is committed. The Criminal Code defines assault as a dual offence (indictable or summary offence). Police officers can arrest someone without a warrant for an assault if it is in the public's interest to do so notwithstanding S.495(2)(d) of the Code. This public interest is usually satisfied by preventing a continuation or repetition of the offence on the same victim.
Some variations on the ordinary crime of assault include:
An individual cannot consent to an assault with a weapon, assault causing bodily harm, aggravated assault, or any sexual assault. Consent will also be vitiated if two people consent to fight but serious bodily harm is intended and caused (R v Paice; R v Jobidon). A person cannot consent to serious bodily harm.
Ancient Greece.
Assault in Ancient Greece was normally termed hubris. Contrary to modern usage, the term did not have the extended connotation of overweening pride, self-confidence or arrogance, often resulting in fatal retribution. In Ancient Greece, "hubris" referred to actions which, intentionally or not, shamed and humiliated the victim, and frequently the perpetrator as well. It was most evident in the public and private actions of the powerful and rich.
Violations of the law against hubris included, what would today be termed, assault and battery; sexual crimes ranging from forcible rape of women or children to consensual but improper activities; or the theft of public or sacred property. Two well-known cases are found in the speeches of Demosthenes, a prominent statesman and orator in ancient Greece. These two examples occurred when first, in addition to other acts of violence, Meidias allegedly punched Demosthenes in the face in the theater (Against Meidias), and second (Against Konon), when the defendant allegedly severely beat him.
Hubris, though not specifically defined, was a legal term and was considered a crime in classical Athens. It was also considered the greatest sin of the ancient Greek world. That was so because it not only was proof of excessive pride, but also resulted in violent acts by or to those involved. The category of acts constituting hubris for the ancient Greeks apparently broadened from the original specific reference to mutilation of a corpse, or a humiliation of a defeated foe, or irreverent, "outrageous treatment", in general.
The meaning was eventually further generalized in its modern English usage to apply to any outrageous act or exhibition of pride or disregard for basic moral laws. Such an act may be referred to as an "act of hubris", or the person committing the act may be said to be hubristic. Atë, Greek for 'ruin, folly, delusion', is the action performed by the hero, usually because of their hubris, or great pride, that leads to their death or downfall.
Crucial to this definition are the ancient Greek concepts of honor (timē) and shame. The concept of timē included not only the exaltation of the one receiving honor, but also the shaming of the one overcome by the act of hubris. This concept of honor is akin to a zero-sum game. Rush Rehm simplifies this definition to the contemporary concept of "insolence, contempt, and excessive violence".
India.
The Indian Penal Code covers the punishments and types of assault in Chapter 16, sections 351 through 358.
The Code further explains that "mere words do not amount to an assault. But the words which a person uses may give to their gestures or preparation such a meaning as may make those gestures or preparations amount to an assault". Assault is in Indian criminal law an attempt to use criminal force (with criminal force being described in s.350). The attempt itself has been made an offence in India, as in other states.
Nigeria.
The Criminal Code Act (chapter 29 of Part V; sections 351 to 365) creates a number of offences of assault. Assault is defined by section 252 of that Act. Assault is a misdemeanor punishable by one year imprisonment; assault with "intent to have carnal knowledge of him or her" or who indecently assaults another, or who commits other more-serious variants of assault (as defined in the Act) are guilty of a felony, and longer prison terms are provided for.
Pacific Islands.
Marshall Islands
The offence of assault is created by section 113 of the Criminal Code. A person is guilty of this offence if they unlawfully offer or attempt, with force or violence, to strike, beat, wound, or do bodily harm to, another.
Republic of Ireland.
Section 2 of the Non-Fatal Offences against the Person Act 1997 creates the offence of assault, and section 3 of that Act creates the offence of assault causing harm.
South Africa.
South African law does not draw the distinction between assault and battery. "Assault" is a common law crime defined as "unlawfully and intentionally applying force to the person of another, or inspiring a belief in that other that force is immediately to be applied to him". The law also recognises the crime of "assault with intent to cause grievous bodily harm", where grievous bodily harm is defined as "harm which in itself is such as seriously to interfere with health". The common law crime of "indecent assault" was repealed by the Criminal Law (Sexual Offences and Related Matters) Amendment Act, 2007, and replaced by a statutory crime of "sexual assault".
United Kingdom.
Abolished offences:
England and Wales.
English law provides for two offences of assault: common assault and battery. Assault (or common assault) is committed if one intentionally or recklessly causes another person to apprehend immediate and unlawful personal violence. "Violence" in this context means any unlawful touching, though there is some debate over whether the touching must also be hostile. The terms "assault" and "common assault" often encompass the separate offence of battery, even in statutory settings such as section 40(3)(a) of the Criminal Justice Act 1988 (c. 33).
A common assault is an assault that lacks any of the aggravating features which Parliament has deemed serious enough to deserve a higher penalty. Section 39 of the Criminal Justice Act 1988 provides that common assault, like battery, is triable only in a magistrates' court in England and Wales (unless it is linked to a more serious offence, which is triable in the Crown Court). Additionally, if a defendant has been charged on an indictment with assault occasioning actual bodily harm (ABH), or racially/religiously aggravated assault, then a jury in the Crown Court may acquit the defendant of the more serious offence, but still convict of common assault if it finds common assault has been committed.
Aggravated assault.
An assault which is aggravated by the scale of the injuries inflicted may be charged as offences causing "actual bodily harm" (ABH) or, in the severest cases, "grievous bodily harm" (GBH).
Other aggravated assault charges refer to assaults carried out against a specific target or with a specific intent:
Scotland.
In Scots law, assault is defined as an "attack upon the person of another". There is no distinction made in Scotland between assault and battery (which is not a term used in Scots law), although, as in England and Wales, assault can be occasioned without a "physical" attack on another's person, as demonstrated in "Atkinson v. HM Advocate" wherein the accused was found guilty of assaulting a shop assistant by simply jumping over a counter while wearing a ski mask. The court said:
Scots law also provides for a more serious charge of aggravated assault on the basis of such factors as severity of injury, the use of a weapon, or "Hamesucken" (to assault a person in their own home). The "mens rea" for assault is simply "evil intent", although this has been held to mean no more than that assault "cannot be committed accidentally or recklessly or negligently" as upheld in "Lord Advocate's Reference No 2 of 1992" where it was found that a "hold-up" in a shop justified as a joke would still constitute an offence.
It is a separate offence to assault on a constable in the execution of their duty, under section 90 of the Police and Fire Reform (Scotland) Act 2012 (asp 8) (previously section 41 of the Police (Scotland) Act 1967 (c. 77)) which provides that it is an offence for a person to, amongst other things, assault a constable in the execution of their duty or a person assisting a constable in the execution of their duty.
Northern Ireland.
Several offences of assault exist in Northern Ireland. The Offences against the Person Act 1861 (24 & 25 Vict. c. 100) creates the offences of:
The Criminal Justice (Miscellaneous Provisions) Act (Northern Ireland) 1968 (c. 28 (N.I.)) creates the offences of:
That act formerly created the offence of 'Assault on a constable in the execution of his duty'. under section 7(1)(a), but that section has been superseded by section 66(1) of the Police (Northern Ireland) Act 1998 (c. 32) which now provides that it is an offence for a person to, amongst other things, assault a constable in the execution of his duty, or a person assisting a constable in the execution of his duty.
United States.
In the United States, assault may be defined as an attempt to commit a battery. However, the crime of assault can encompass acts in which no battery is intended, but the defendant's act nonetheless creates reasonable fear in others that a battery will occur.
Four elements were required at common law:
As the criminal law evolved, element one was weakened in most jurisdictions so that a reasonable fear of bodily injury would suffice. These four elements were eventually codified in most states.
The crime of assault generally requires that both the perpetrator and the victim of an assault be a natural person. Thus, unless the attack is directed by a person, an animal attack does not constitute an assault. However, under limited circumstances the Unborn Victims of Violence Act of 2004 treats a fetus as a separate person for the purposes of assault and other violent crimes.
Possible examples of defenses, mitigating circumstances, or failures of proof that may be raised in response to an assault charge include:
State laws.
Laws on assault vary by state. Since each state has its own criminal laws, there is no universal assault law. Acts classified as assault in one state may be classified as battery, menacing, intimidation, reckless endangerment, etc. in another state. Assault is often subdivided into two categories, simple assault and aggravated assault.
Modern American statutes may define assault as including:
In some states, consent is a complete defense to assault. In other jurisdictions, mutual consent is an incomplete defense to an assault charge such that an assault charge is prosecuted as a less significant offense such as a "petty misdemeanor".
States vary on whether it is possible to commit an "attempted assault" since it can be considered a double inchoate offense.
Kansas.
In Kansas the law on assault states:
New York.
In New York State, assault (as defined in the New York State Penal Code Article 120) requires an actual injury. Other states define this as battery; there is no crime of battery in New York. However, in New York if a person threatens another person with imminent injury without engaging in physical contact, that is called "menacing". A person who engages in that behavior is guilty of aggravated harassment in the second degree (a Class A misdemeanor; punishable with up to one year incarceration, probation for an extended time, and a permanent criminal record) when they threaten to cause physical harm to another person, and guilty of aggravated harassment in the first degree (a Class E felony) if they have a previous conviction for the same offense. New York also has specific laws against hazing, when such threats are made as requirement to join an organization.
North Dakota.
North Dakota law states:
Pennsylvania.
In Pennsylvania, an offender can be charged with simple assault if they:
A person convicted of simple assault can be ordered to up to two years in prison as a second-degree misdemeanor.
An offender can be charged with aggravated assault if the offender:
A person convicted of aggravated assault can face up to 10 years in prison as a second-degree felony. However, if the crime is perpetrated against a firefighter or police officer, the offender may face first-degree felony charges carrying a penalty of up to 20 years in prison.
Tennessee.
In Tennessee assault is defined as follows:
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Álfheimr
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In Norse cosmology, Álfheimr (Old Norse: , "Land of the Elves" or "Elfland"; anglicized as Alfheim), also called "Ljósálfheimr" ( , "home of the Light Elves"), is home of the Light Elves.
Attestations.
Álfheim as an abode of the Elves is mentioned only twice in Old Norse texts.
Grímnismál.
The Eddic poem "Grímnismál" describes twelve divine dwellings beginning the stanza 5 with:
A tooth-gift is a gift given to an infant on the cutting of the first tooth.
Gylfaginning.
In the 12th century Eddic prose "Gylfaginning", Snorri Sturluson relates it in the stanza 17 as the first of a series of abodes in heaven:
Later in the section, in speaking of a hall in the Highest Heaven called Gimlé that shall survive when heaven and earth have died, explains:
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Ask and Embla
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In Norse mythology, Ask and Embla ()—man and woman respectively—were the first two humans, created by the gods. The pair are attested in both the "Poetic Edda", compiled in the 13th century from earlier traditional sources, and the "Prose Edda", composed in the 13th century. In both sources, three gods, one of whom is Odin, find Ask and Embla and bestow upon them various corporeal and spiritual gifts. A number of theories have been proposed to explain the two figures, and there are occasional references to them in popular culture.
Etymology.
Old Norse literally means "ash tree" but the etymology of "embla" is uncertain, and two possibilities of the meaning of "embla" are generally proposed. The first meaning, "elm tree", is problematic, and is reached by deriving "*Elm-la" from "*Almilōn" and subsequently to ('elm'). The second suggestion is "vine", which is reached through "*Ambilō", which may be related to the Greek term (), itself meaning "vine, liana". The latter etymology has resulted in a number of theories.
Linguist Gunlög Josefsson claims that the name Embla comes from the roots + which would mean 'firemaker' or 'smokebringer' inflected for either gender. She connects this to the ancient practice of creating fire through a fire plough which was considered a magical and holy way of fire making in folk belief in Scandinavia long into modern times. She identifies the emergence of fire through the plowing symbolically to the moment of orgasm and hence fertilization and reproduction.
According to Benjamin Thorpe, "Grimm says the word embla, emla, signifies a busy woman, from amr, ambr, aml, ambl, assiduous labour; the same relation as Meshia and Meshiane, the ancient Persian names of the first man and woman, who were also formed from trees."
Attestations.
In stanza 17 of the "Poetic Edda" poem , the seeress reciting the poem states that Hœnir, Lóðurr and Odin once found Ask and Embla on land. The seeress says that the two were capable of very little, lacking in and says that they were given three gifts by the three gods:
The meaning of these gifts has been a matter of scholarly disagreement and translations therefore vary.
According to chapter 9 of the "Prose Edda" book , the three brothers Vili, Vé, and Odin, are the creators of the first man and woman. The brothers were once walking along a beach and found two trees there. They took the wood and from it created the first human beings; Ask and Embla. One of the three gave them the breath of life, the second gave them movement and intelligence, and the third gave them shape, speech, hearing and sight. Further, the three gods gave them clothing and names. Ask and Embla go on to become the progenitors of all humanity and were given a home within the walls of Midgard.
Theories.
Indo-European origins.
A Proto-Indo-European basis has been theorized for the duo based on the etymology of "embla" meaning "vine." In Indo-European societies, an analogy is derived from the drilling of fire and sexual intercourse. Vines were used as a flammable wood, where they were placed beneath a drill made of harder wood, resulting in fire. Further evidence of ritual making of fire in Scandinavia has been theorized from a depiction on a stone plate on a Bronze Age grave in Kivik, Scania, Sweden.
Jaan Puhvel comments that "ancient myths teem with trite 'first couples' similar to the type of Adam and his by-product Eve. In Indo-European tradition, these range from the Vedic Yama and Yamī and the Iranian Mašya and Mašyānag to the Icelandic Askr and Embla, with trees or rocks as preferred raw material, and dragon's teeth or other bony substance occasionally thrown in for good measure".
In his study of the comparative evidence for an origin of mankind from trees in Indo-European society, Anders Hultgård observes that "myths of the origin of mankind from trees or wood seem to be particularly connected with ancient Europe and Indo-Europe and Indo-European-speaking peoples of Asia Minor and Iran. By contrast the cultures of the Near East show almost exclusively the type of anthropogonic stories that derive man's origin from clay, earth or blood by means of a divine creation act".
Other potential Germanic analogues.
Two wooden figures—the Braak Bog Figures—of "more than human height" were unearthed from a peat bog at Braak in Schleswig, Germany. The figures depict a nude man and a nude woman. Hilda Ellis Davidson comments that these figures may represent a "Lord and Lady" of the Vanir, a group of Norse gods, and that "another memory of [these wooden deities] may survive in the tradition of the creation of Ask and Embla, the man and woman who founded the human race, created by the gods from trees on the seashore".
A figure named Æsc (Old English "ash tree") appears as the son of Hengest in the Anglo-Saxon genealogy for the kings of Kent. This has resulted in a number of theories that the figures may have had an earlier basis in pre-Norse Germanic mythology.
Connections have been proposed between Ask and Embla and the Vandal kings Assi and Ambri, attested in Paul the Deacon's 7th century AD work "Origo Gentis Langobardorum". There, the two ask the god Godan (Odin) for victory. The name "Ambri", like Embla, likely derives from "*Ambilō".
Catalog of dwarfs.
A stanza preceding the account of the creation of Ask and Embla in "Völuspá" provides a catalog of dwarfs, and stanza 10 has been considered as describing the creation of human forms from the earth. This may potentially mean that dwarfs formed humans, and that the three gods gave them life. Carolyne Larrington theorizes that humans are metaphorically designated as trees in Old Norse works (examples include "trees of jewellery" for women and "trees of battle" for men) due to the origin of humankind stemming from trees; Ask and Embla.
Modern depictions.
Ask and Embla have been the subject of a number of references and artistic depictions.
A sculpture depicting the two, created by Stig Blomberg in 1948, stands in Sölvesborg in southern Sweden.
Ask and Embla are depicted on two of the sixteen wooden panels by Dagfin Werenskiold on Oslo City Hall.
"Ask to Embla" is the title of a poem, parts of which are quoted, by R. H. Ash, one of the protagonists in A. S. Byatt's novel Possession: A Romance, which won the Booker prize in 1990.
In the video game "Fire Emblem Heroes", the two main warring kingdoms are Askr and Embla, which is where the Summoner, the player, finds themselves in, as the kingdom has been at war with the Emblian Empire when the game starts. It is later revealed both kingdoms are named after a pair of Ancient Dragons; with Askr being male and Embla female.
In the videogame Valheim, the developers named an armor set after Embla, as stated in their development blog entry on November 21, 2023: "we have named this set after one of the two first humans in Norse mythology: Embla".
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Alabama River
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The Alabama River, in the U.S. state of Alabama, is formed by the Tallapoosa and Coosa rivers, which unite about north of Montgomery, near the town of Wetumpka.
Over a course of approximately , the river meanders west towards Selma, then southwest until, about from Mobile, it unites with the Tombigbee, forming the Mobile and Tensaw rivers, which discharge into Mobile Bay.
Description.
The run of the Alabama is highly meandering. Its width varies from , and its depth from . Its length as measured by the United States Geological Survey is , and by steamboat measurement, .
The river crosses the richest agricultural and timber districts of the state. Railways connect it with the mineral regions of north-central Alabama.
After the Coosa and Tallapoosa rivers, the principal tributary of the Alabama is the Cahaba River, which is about long and joins the Alabama River about below Selma. The Alabama River's main tributary, the Coosa River, crosses the mineral region of Alabama and is navigable for light-draft boats from Rome, Georgia, to about above Wetumpka (about below Rome and below Greensport), and from Wetumpka to its junction with the Tallapoosa. The channel of the river has been considerably improved by the federal government.
The navigation of the Tallapoosa River – which has its source in Paulding County, Georgia, and is about long – is prevented by shoals and a fall at Tallassee, a few miles north of its junction with the Coosa. The Alabama is navigable throughout the year.
The river played an important role in the growth of the economy in the region during the 19th century as a source of transportation of goods, which included slaves. The river is still used for transportation of farming produce; however, it is not as important as it once was due to the construction of roads and railways.
Documented by Europeans first in 1701, the Alabama, Coosa, and Tallapoosa rivers were central to the homeland of the Creek Indians before their removal by United States forces to the Indian Territory in the 1830s.
Lock and dams.
The Alabama River has three lock and dams between Montgomery and the Mobile River. The Robert F. Henry Lock & Dam is located at river mile 236.2, the Millers Ferry Lock & Dam is located at river mile 133.0, and the Claiborne Lock & Dam is located at river mile 72.5. These dams create R.E. "Bob" Woodruff Lake, William Dannely Reservoir, and Claiborne Lake respectively.
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