Two letter relating to publications addressed to David Cook Medical Librarian, Universtiy of Manchester. The first, dated 6 Sept 1975 relates to the rewriting of the seventeenth edition (1972) of Sir Patrick Manson's Tropical Diseases (copy in JRUL). The second, dated 29 Sept. 1975 relates to out of print offprints of Wilcock's articles, and offprints on sleeping sickness By Dr. J.F. Corson. He provides a brief outline of Corson's life; he claims to have known him well.