How many detailed drawing did he have on anatomy ?
" Bell also combined his many artistic , scientific , literary and teaching talents in a number of wax preparations and detailed anatomical and surgical illustrations , paintings and engravings in his several books on these subjects , such as in his book " Illustrations of the Great Operations of Surgery : Trepan , Hernia , Amputation , Aneurism , and Lithotomy " ( 1821 ) .