 In 1906, a chemist from the University of Michigan, Edwin B. Hart (1874–1953), was hired by Babcock.Hart previously had worked at the New York State Agricultural Experiment Station, and had studied physiological chemistry under Albrecht Kossel in Germany.Both worked with George C. Humphrey, who replaced Carlyle as animal husbandry professor, to plan a long-term feeding plan using a chemically-balanced diet of carbohydrates, fat, and protein instead of single plant rations as done in Babcock's earlier experiments.