Letter, 16 July 1890
Letter to Sir John Burdon Sanderson, July 12, 1895(?)
Letter to Sir John Burdon Sanderson, April 29, 1895
Letter to Sir John Burdon Sanderson, January 23, 1895
Letter to Sir John Burdon Sanderson, February 26, 1895
Letter to Sir John Burdon Sanderson, May 21, 1895
Letter, 9 June 1896
Letter, 21 January 1896
Letter, 21 March 1896
Letter, 13 December 1899