Letter from Howard Walter Florey to M O Tirunarayanan, J R Geigy SA, Basle Says no-one in department has resistant mutants of staphylococci together with parent culture from which they were developed - suggests Tirunarayanan write to the Director of the Central Public Health Laboratories, London - pleased Tirunarayanan is coming to Britain - asks him to let them know when he is coming to Oxford. 15/01/1959