Referee's report by Robert Robertson, on a paper 'Investigations in the infra-red region of the spectrum. Part VII.—An infra-red grating spectrometer as a double monochomator' by A B D Cassie and C R Bailey Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. The paper is lengthy, but the results and observations should be put on record. [Published in the 'Proceedings of the Royal Society of London' A, 1932] Endorsed on verso as received 2 August 1932. [August 1932]