Summary: Correspondence; student notebooks from University of Michigan and Bellevue Hospital; drafts of speeches and lecture notes; newspaper clippings and scrapbooks; and topical files. Include material concerning medical theories and practices, especially matters of diet and hygiene, his work with organizations such as the National Vitality League, Race Betterment Foundation, Battle Creek Three Quarter Century Club, Chicago Workingmen's Home and Medical Mission, and Seventh-Day Adventists; also photographs. Correspondents include: C. W. Barron, W. Boldyreff, Richard E. Byrd, B. Hodges Campbell, Mary G. Edison, Thomas A. Edison, G. Efromoff, Irving Fisher, Clara J. Ford, Henry Ford, Margaret LeHand, Ernest G. Liebold, Chase S. Osborn, Thomas Parran, I. P. Pavlov, Gifford Pinchot, Hazen Pingree, Sir Horace Plunckett, M. Pomari, John D. Rockefeller, Jr., Franklin D. Roosevelt, George Bernard Shaw, William Howard Taft, Ida Tarbell, L. Tissier, Leo Tolstoi, Ilga Tolstoi, and Louis J. Van Shaick.
Repository: Bentley Historical Library, University of Michigan.