Letter from N G Heatley, Peoria to Howard Walter Florey Says Merck wants subcultures of strains of pathogenic organisms used for animal experiments with penicillin at Oxford - gave talk at Chicago University - does Florey think such talks good - sent penicillin information to E D G Murray, McGill University - yields of 16 u/cc quite common - Moyer is repeating the experiments. 21 November 1941