Letter from Norman Heatley, Oxford to H W Florey, New Haven, Connecticut Has completed paper on F - omitted section on the 200 strains - gives details of examination of these with fresh test organisms - discusses acknowledgements for early work and reference to Dubos - rapid test of many bacteria agains many test organisms using large plate and cellophane sheet worked. Manuscript note: suggests short paper on this for J of the Soc Gen Microbiol. 31 July 1946