Cyril P. Callister Cyril P. Callister Cyril Percy Callister (16 February 1893 – 5 October 1949) was an Australian chemist and food technologist who developed the Vegemite yeast spread. The son of a teacher and postmaster, and one of seven children, he attended the Ballarat School of Mines and later won a scholarship to the University of Melbourne. He gained a Bachelor of Science degree in 1914 and a Master of Science degree in 1917. In early 1915, Callister was employed by food manufacturer Lewis & Whitty, but later that year he enlisted in the Australian Imperial Force. After 53 days, however, he
Daddy, what did you do in the Great War? on such a scale that "this time there would also have to be a vast recruitment of men like Daddy". There were 1.4 million new volunteers in 1915, up from 1 million in 1914. 2.4 million Britons, or approximately 30% of military aged men, had volunteered for military service. Scholars believe the "scale and nature of enlistment in Great Britain and the Dominions suggest the nations' emotional investment in the war". Stéphane Audoin-Rouzeau and Annette Becker have written that the campaign of mass propaganda, including what they describe as the "guilt-inducing and brutal messages" such as "Daddy, what did YOU