Letter from Howard Walter Florey to Donald A Rowley, Department of Pathology, University of Chicago Sorry for delay in answering Rowley's letter, which arrived when he was in Australia - has been very busy since his return - thinks Rowley's pump gives good impulse - interested in Rowley's observations on rats with hypertension - has little time for experimental work - has rooms in Physiology but still uses electron microscope in Pathology Department. 2 January 1964