Letter, 6 December 1870
Letter, 29 September 1883
Letter, 26 October 1883
Letter, 26 October 1883
Letter, 26 December 1894
Letter, 20 March 1890
Letter, 11 July 1871
Letter, 10 May 1870
Letter, 10 March 1875
Letter to William Osler, December 15, 1894