Copy letter from [Francis Alexander Towle, Assistant Secretary of the Royal Society]; to unknown correspondent 'Kindly forward on loan to Dr [Frederick Frost] Blackman, FRS, St John's College, Cambridge, the blocks of figures 1, on p.404 (B.76), p.376 (B.83), and p.307 (B.92) of the Proceedings, requesting him to return them to you when finished with.' 8 December 1924