Letter from Howard Walter Florey to Ritchie Calder Thanks for way in which his comments on Calder's penicillin articles were received - says he is often singled out for unjust praise - discusses Chain's contributions - anxious that Chain's lack of opportunity in Britain should not be attributed to short-sightedness of people here - says that Chain informed Szent Gyorgy in 1946 that he had finished work on antibiotics and was going to work on immuno-chemistry. December 1953 - January 1954