This is a diverse collection, including correspondence, drafts of letters, notes and notebooks (on biometric methods; tables and formulae; science, nature and method; coefficient and correlation; vitalism; Japanese language); commonplace book (1924); autobiography; and over one hundred folders of unpublished writings. The correspondence and other material covers a variety of topics, including biology, eugenics, evolution and natural selection, human heredity, paramecia, protozoa genetics, U.S. immigration policy. There is much on the Seventh International Congress of Zoology (1907); letters to his father and wives, and from students and colleagues on his seventy-fifth birthday, 1943 (1 v.); diplomas and certificates of membership; and photographs.

William Jacob Robbins (1890-1978, APS 1941) was a botanist and physiologist. From 1937 to 1957 he was director of the New York Botanical Garden. His research focused on culture methods of plants in relation to biochemistry and nutrition, especially on the synthetic abilities of fungi. His studies paralleled the scientific agenda of the Rockefeller Foundation, an agency with which he was closely associated for years as adviser and trustee. He was perhaps the most influential botanist in the National Academy of Sciences (NAS) during the early postwar era, and a principal participant in the plans for the global reconstruction of science. Robbins served as president of the American Philosophical Society from 1956 to 1959.

For his pioneering research on the link between viruses and cancer, the pathologist Francis Peyton Rous was awarded the Nobel Prize in Medicine in 1966. Working primarily at the Rockefeller Institute after 1909, Rous first came to notice for his theoretical construction of the first blood bank for use in France during World War I, a plan ultimately implemented by his assistant, Oswald H. Robertson. Subsequently, he left an important imprint on the development of experimental medicine, partly through his own research on the origins of cancer and his administrative activities at the Rockefeller, but also as editor of the Journal of Experimental Medicine from 1921-1970. The Rous Papers include correspondence, lectures, articles, reports, laboratory records, reprints, and photographs that document all aspects of the life and work of Peyton Rous. Reflecting his work at the Institute are letters of colleagues, information on assistants, and reports to the directors (1909-1959). Additional material relates to Rous' diverse organizational interests, including the American Cancer Society, Century Association, Jane Coffin Childs Memorial Fund for Medical Research (at Yale University), Federation of American Societies for Experimental Biology, Johns Hopkins University, National Academy of Sciences, National Research Council, New York Academy of Medicine, Royal Society of Medicine Foundation, and Sloan-Kettering Institute for Cancer Research.