Letter from B.T. Batsford Limited, 94 High Holborn, London W.C.1, to the Secretary, The Royal Society Enquiring about the place of publication of a 1915 paper by Lord Rayleigh, 'The neglect of the principle of similitude'. This has been cited in 'Engineering', and in an obituary account, but the full treatment cannot be found. If it was contributed to the Royal Society, Batsford should be informed of its availability and price. 25 July 1919