Correspondence, diaries, speeches, articles, lectures, notes, biographical and genealogical material, family correspondence and other papers documenting the life and career of James McKeen Cattell. Includes much correspondence on the preparation of articles for publication in the various journals edited by Cattell, files of material relating to the American Association for the Advancement of Science, the Psychological Corporation, the Science Press, other scientific organizations as well as the publication, American Men of Science, in all of which he was very active. Correspondents include James R. Angell, Charles E. Bessey, Franz Boas, Edwin G. Boring, Nicholas Murray Butler, Otis W. Caldwell, John Dewey, Asaph Hall, William J. Humphreys, Ellsworth Huntington, William James, Joseph Jastrow, David Starr Jordan, Vernon Kellogg, Burton E. Livingston, Jacques Loeb, Arthur O. Lovejoy, Thomas Hunt Morgan, Raymond Pearl, Charles Sanders Peirce, Carl E. Seashore, Edward L. Thorndike, Edward B. Titchener, and John B. Watson.