Referee's report by Gilbert Thomas Morgan and Cecil Henry Desch, on a paper 'X-ray study of the inter-diffusion of copper and zinc' by E A Owen and Llewelyn Pickup Sectional committee: Physics Recommended for publication in Proceedings. The results are interesting, but the paper needs to be dramatically shortened to sixteen pages in the Proceedings. [Published in Proceedings of the Royal Society A, 1935]. Endorsed on verso as received 1 August 1933. 31 July 1933