According to Galen, in his work entitled "De ossibus ad tirones", the lower jaw consists of two parts, proven by the fact that it disintegrates in the middle when cooked. Abd al-Latif al-Baghdadi, while on a visit to Egypt, encountered many skeletal remains of those who had died from starvation near Cairo. He examined the skeletons and established that the mandible consists of one piece, not two as Galen had taught. He wrote in his work "Al-Ifada w-al-Itibar fi al_Umar al Mushahadah w-al-Hawadith al-Muayanah bi Ard Misr", or "Book of Instruction and Admonition on the Things Seen and Events Recorded in the Land of Egypt":