Second 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 The authors should consider the results of Tillman. The work 'our' should be inserted before 'electron diffraction experiments'. If this happens, he will approve publication. [Published in Proceedings of the Royal Society A, 1935]. Endorsed on verso as received 13 June 1935. June 1935