Letter, 30 November 1871
Letter, 30 January 1872
Letter, 4 June 1870
Letter, 15 June 1870
Letter to Mr. Provost, December 10, 1903
Letter to Arthur Thomson, December 2, 1903
Letter to J.S. Fairbairn, January 13, 1904
Letter to W. Cecil Bosanquet, January 23, 1904
Letter to Sir John Burdon Sanderson, June 27, 1904
Letter to Harvey Cushing, March 27, 1921