<human>: Background: Yagan (; c. 1795 - 11 July 1833) was an Indigenous Australian warrior from the Noongar people. He played a key part in early resistance to British colonial settlement and rule in the area surrounding what is now Perth, Western Australia. Yagan was pursued by the local authorities after he killed a servant of Archibald Butler in an act of retaliation after Smedley, another servant of Butler, shot at a group of Noongar people taking potatoes and fowls, killing one of them. The government offered a bounty for Yagan's capture, dead or alive, and a young settler, William Keats, subsequently shot and killed him.
Context: Yagan's head was initially taken to Henry Bull's house. Moore saw it there and sketched the head a number of times in his unpublished, handwritten diary, commenting that "possibly it may yet figure in some museum at home." The head was preserved by smoking.  In September 1833, Governor Irwin sailed for London, partly to give his own account of the events leading up to the killing. This was an unusual measure, especially given his regiment was about to leave for a tour of duty in India. The Colonial Office indicated satisfaction with Irwin's administration of the colony.  Travelling with Irwin was Ensign Robert Dale, who had somehow acquired Yagan's head. According to the historian Paul Turnbull, Dale appears to have persuaded Irwin to let him have the head as an "anthropological curiosity". After arriving in London, Dale tried to sell the head to scientists, approaching a number of anatomists and phrenologists. His price of L20 failed to find a buyer, so he made an agreement with Thomas Pettigrew for the exclusive use of the head for 18 months. Pettigrew, a surgeon and antiquarian, was well known in the London social scene for holding private parties at which he unrolled and autopsied Egyptian mummies. He displayed the head on a table in front of a panoramic view of King George Sound reproduced from Dale's sketches. For effect, the head was adorned with a fresh corded headband and feathers of the red-tailed black cockatoo.  Pettigrew had the head examined by a phrenologist. Examination was considered difficult because of the large fracture across the back of the head caused by the gunshot. His conclusions were consistent with contemporary European opinion of Indigenous Australians. Dale published these in a pamphlet entitled Descriptive Account of the Panoramic View &c. of King George's Sound and the Adjacent Country, which Pettigrew encouraged his guests to buy as a souvenir of their evening. The frontispiece of the pamphlet was a hand-coloured aquatint print of Yagan's head by the artist George Cruikshank.  Early in October 1835, Yagan's head and the panoramic view were returned to Dale, then living in Liverpool. On 12 October he presented them to the Liverpool Royal Institution, where the head may have been displayed in a case along with some other preserved heads and wax models illustrating cranial anatomy. In 1894 the Institution's collections were dispersed, and Yagan's head was lent to the Liverpool Museum; it is thought not to have been put on display there. By the 1960s Yagan's head was badly deteriorated. In April 1964 the museum decided to dispose of it. It arranged burial of the head on 10 April 1964, together with a Peruvian mummy and a Maori head. They were buried in Everton Cemetery's General Section 16, grave number 296. In later years a number of burials were made around the grave. For example, in 1968 a local hospital buried directly over the box, 20 stillborn babies and two infants who died soon after birth. CANNOTANSWER
Question: Why was that?

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<bot>: For example, in 1968 a local hospital buried directly over the box, 20 stillborn babies and two infants who died soon after birth.