John Neagle was among the better known portrait painters in Philadelphia during the first half of the nineteenth century and was the husband of Thomas Sully's niece, Mary C. Sully. The Neagle Papers is a small assemblage of personal correspondence, documents, and notes assembled by Neagle during his career. The letters are primarily of a personal nature, but along with the five bound volumes, offer insight into Neagle's study of painting and the techniques he employed. Included among the bound volumes are recipes for varnish, megellup, and drying oils and notes on watercolor painting.

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and correlation; vitalism; Japanese language); commonplace book (1924); autobiography; and over one hundred folders of unpublished writings.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.

Edward Uhler Condon was a theoretical physicist at Princeton University and Westinghouse Laboratories who later served as director of the National Bureau of Standards (1945-1951), and as the director of research and development (1951-1954) and consulting physicist (1954-1974) at Corning Glass Works. The Condon Papers includes correspondence, notebooks, writings, photographs, and other materials concerning Condon's education, teaching, and his government, industrial, and academic.