Correspondence between Henry Barcroft and the Royal Society General correspondence, largely on updates to Barcroft's personal information file. Letters to and from the Assistant Secretary, David Christie Martin, and the Librarian, Igor Kaye. The original file featured the typed name and address: 'Professor H. Barcroft, F.R.S., Sherrington School of Physiology, St. Thomas's Hospital, London, S.E.1'. 25 June 1953-30 January 1959