Referee's report by Robert Robertson, on two papers 'Investigations in the infra-red region of the spectrum. Part III.—The absorption spectrum of carbon disulphide' and 'Investigations in the infra-red region of the spectrum. Part IV. -The monochromator method in the infra-red' by C R Bailey and A B D Cassie Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. [Both papers p ublished in the 'Proceedings of the Royal Society of London' A, 1931] Endorsed on verso as received 30 March 1931. [March 1931]