Correspondents include Sydney George Fisher, Theodore J. Lewis, A. M. Carpenter, James H. Wilson, Mary Stuart, John Hall Wheelock, Lawrence F. Flick, Thomas Hamlin Hubbard, Harrison S. Morris, F. B. Gummer, William Thomas Manning, James Harrison Wilson, William Osler, John F. Graff, Max L. Marghis, Rudolph Brinnow, Rickman John Godlee, W. L. Bliss, and Beverley Randolph Tucker. All of the correspondence is from 1913, with the exception of a typescript copy of a 1915 letter from Mitchell's son John K. Mitchell (1859–1917) to Osler.