Letter to Parkinson, June 2, 1914
Letter to Pearson, February 11, 1908
Letter to President of John Hopkins University, October 30, 1918
Letter to President of Johns Hopkins University, January 31, 1919
Letter to The Editor of the Times, October 21, 1914
Letter to The Graduates of the Johns Hopkins Medical School, October 30, 1905
Letter to Tribe, February 11, 1919
Letter to Warden, October 2, 1919
Letter to Watt, March 4, 1915
Letter to Yale University Press, February 26, 1913