Letter from Howard Walter Florey to Henry Dale, National Institute for Medical Research, Hampstead Is sending notes from Heatley - discusses ludicrous position about collaboration of American firms - would be grateful if Dale could do anything about penicillin production when he is in Washington - has told Heatley to work for Merck for a time - seem the most likely people to produce material within a measurable period of time. 4 November 1941