Referee's report by Leonard James Spencer, on a paper 'The lamellar structure of potash-soda felspars' by S H Chao and W H Taylor Sectional Committee: Physics Not recommended for publication in the 'Proceedings of the Royal Society of London'. Finds some of the results published by the same authors elsewhere. CSuggests further investigation should be completed before the paper is published. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on recto as received 27 June 1939. 25 June 1939