Referee's report by Jocelyn Field Thorpe, on a paper 'The density and compressibility of phosphine gas; the atomic weight of phosphorus' by Mowbray Ritchie Sectional committee: Chemistry Recommended for publication in Proceedings, in full. It is concisely written and is a contribution to knowledge. The paper should be referred to a physical chemist to offer an opinion on. [Published in Proceedings of the Royal Society A, 1930]. Endorsed on verso as received 19 February 1930. February 1930