Copy letter from an unknown correspondent, to Messrs Collings & Company, Surrey Chambers, 172 Strand, W.C. Has heard from Sir J Burdon-Sanderson regarding the illustrations to the Croonian Lecture. They may proceed at once with the cliches which the Editor of 'Nature' requires. The blocks are in the hands of Messrs Harrisons, who will deliver them to the Messrs on production of this memorandum. 26 June 1899