Letter from Walter B Cannon of the National Research Council, 2101 Constitution Avenue, Washington DC, to Otto Loewi Was happy to hear that Loewi had a good summer at Wood's Hole. The 'question you raise regarding the way in which the nucleus 'influences' the cytoplasm has bothered me a good deal in the past' - is returning to questions of nuclear function in his new post in the Biological Laboratories of Cambridge - will visit Loewi in New York to talk it over. Has written two books, 'On Being a Medical Researcher,' and 'Supersensitivity of Dennervated Structures.' Asks where he can find Loewi's views on supersensitivity. On the war, comments 'what a relief it will be to have and end to wholesale slaughter - and our children again in their own houses.' 18 September 1944