Letter from Howard Walter Florey to Dr Cruickshanks, London County Council, Public Health Department Says mucus secretion of the colon can be controlled by the central nervous system - alkaline fluid secreted in cat's colon when N erigens stimulated - at least upper part of cat's intestine secretes in response to vagal stimulation - comments on this - may throw some light on Cruickshank's problem [enteritis in infants] - evidence of incomplete development of nervous system in infants. 8 July 1938