These letters are from Rutherford to Bertram Borden Boltwood, the Yale University chemist who worked with Rutherford on his scientific study of radioactivity and the structure of the atom. There is much information concerning professional activities and colleagues.

These are the professional, personal, and family papers of Marsh, and include correspondence and unpublished writings.

These classroom notes, taken by an unidentified student, present the state of knowledge in natural philosophy, especially astronomy, during these years. There are mentions of many contemporary scientists, and much on Newton and Newtonian philosophy.

The collection consists of diaries, 1890-1938, containing brief records of professional work and family events (49 vols.); also autobiography entitled "Memories for my boys," 1930 (B D713m), referring to his childhood and to his professional career and mentioning Franz Boas, William Comstock, Livingston Farrand, William W. Keen, S. Weir Mitchell, Elihu Root, and W. T. Sedgewick and also APS, University of Chicago, Johns Hopkins University, Yale University, and Wistar Institute (1 vol.); also a few miscellaneous papers, 1869-1932, chiefly letters to and from members of his family, and also Poultney Bigelow, Simon Henry Gage, and W. B. Van Ingen; two essays ("The Days of Man" and "A Venetian Night"): genealogical data; verses dedicated to his wife; extracts of letters to supplement his diaries.

This collection contains correspondence and reports and documents Florence Seibert's work at Yale University, under Lafayette Benedict Mendel; at the University of Chicago, under H. Gideon Wells; and at the Henry Phipps Institute at the University of Pennsylvania, 1932-1959. There are cancer research folders concerning her later work at the Mound Park Hospital Foundation and the Bay Pines V. A. Center, in St. Petersburg, Florida. There are also substancial amounts on Goucher College (her alma mater); Lilly Research Laboratories; Merck, Sharpe & Dohme; and Parke, Davis & Company.