Letter to Mr. President, March 8, 1902
Letter to Northcliffe, January 22, 1915
Letter to Oxford Mayor, May 1, 1919
Letter to Parkinson, June 2, 1914
Letter to Pearson, February 11, 1908
Letter to Rockefeller, August 28, 1919
Letter to The Editor of the Times, April 24, 1918
Letter to The editor of the Times, August, 1913
Letter to The Editor of the Times, October 21, 1914
Letter to The Graduates of the Johns Hopkins Medical School, October 30, 1905