Letter from Howard Walter Florey to F H Sandford, Registrar, University Registry, Oxford Has been asked to give principal address at 7th Microcirculatory Conference in Washington on 4 and 5 May - should like to attend as conference will discuss work in field in which people in department are working - asks leave of absence for first two weeks of Trinity Term - can make arrangements to deal with departmental affairs during this period. 2 February 1959