The diaries are arranged by interview and visit. From 1924-1926, Sawyer is the director of the International Health Board Public Health Laboratory Service. These entries concern Rockefeller Foundation laboratories, meetings with professionals in the field of public health and conferences pertaining to hookworm. In 1926, Sawyer goes on assignment to the West African Yellow Fever Commission, Lagos, Nigeria. In west Africa he documents laboratory research various field studies on the symptomology and pathology of Yellow Fever Includes "Localities infected with yellow fever in 1926" chart.
