Norman Heatley to J C Woodruff, Merck and Co, Rahway, New Jersey Has visited May and Baker and the Wellcome Institution - in both cases, decided he should wait until agreements had been made between ICI and the Therapeutic Research Corporation (TRC) and between TRC and Merck - is working on penicillin assay method - intends to work on other antibiotics - gives details of talk with Dr Weisner, who is primarily interested in proteolytic enzymes - says that Burroughs Wellcome have applied for provisional patents for a medium for penicillin production - mentions papers published in the June issue of Brit J Exp Pathology on penicillin work. 3 August 1942