Referee's report by Frederick Alexander Lindemann, on a paper 'Optical thickness of the transition layer between transparent media' by H D Bruce Sectional committee: Physics Not recommended for publication. The new results that the paper discovers are 'too slight to justify publication'. It would be better published by the Optical Society. [Published in Proceedings of the Royal Society A, 1939]. Endorsed on verso as received 20 December 1938. 18 December 1938