Letter from Howard Walter Florey to P C Melville, University Registry, Oxford Says A C Ritchie took up Philip Walker Studentship on 1 January 1950 - would like to recommend renewal of Ritchie's studentship for a further two years - Ritchie's work on cancer and on the mode of action of an antibiotic is of a high standard - is enclosing statement of Ritchie's work - background to work on cancer can be found in Ritchie's DPhil thesis. 25 September 1950