Frederick Banting upon the idea of obtaining insulin from the fetal pancreas. He removed the pancreases from fetal calves at a William Davies slaughterhouse and found the extracts to be just as potent as those extracted from the dog pancreases. By December 1921, he had also succeeded in extracting insulin from the adult pancreas. Pork and beef would remain the primary commercial sources of insulin until they were replaced by genetically-engineered bacteria in the late 20th century. In spring of 1922, Banting established a private practice in Toronto and began to treat diabetic patients. His first American patient was Elizabeth Hughes Gossett,
William Banting James’s Street, London, was among the most eminent companies of funeral directors in Britain. As funeral directors to the Royal Household itself, the Banting family conducted the funerals of King George III in 1820, King George IV in 1830, the Duke of Gloucester in 1834, the Duke of Wellington in 1852, Prince Albert in 1861, Prince Leopold in 1884, Queen Victoria in 1901, and King Edward VII in 1910. The royal undertaking warrant for the Banting family eventually ended in 1928 with the retirement of William Westport Banting. In 1863, Banting wrote a booklet called "Letter on Corpulence, Addressed to