Referee's report by Robert Robertson, on a paper 'Investigations in the infra-red region of the spectrum. Part IX.—The absorption spectrum of chlorine monoxide (Cl2O)' by C R Bailey and A B D Cassie Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. [Published in the 'Proceedings of the Royal Society of London' A, 1933] Endorsed on verso as received 12 June 1933. [June 1933]