Referee's report by George Paget Thomson, on a paper 'Diffraction of electrons by metal crystals and by mica' by J A Darbyshire and E R Cooper Sectional committee: Physics No attempt is made by the authors to discuss the much wider general case, or to show that the examples they used are typical, which they don't seem to be. [Published in Proceedings of the Royal Society A, 1935]. Endorsed on verso as received 8 April 1935. April 1935