Referee's report by Herbert Brereton Baker, on a paper 'The density and compressibility of phosphine gas; the atomic weight of phosphorus' by Mowbray Ritchie Sectional committee: Chemistry Not recommended for publication. There is a fatal error in the experiments, which the referee believes to be his fault. The quality of the phosphorus peuloxide should be mentioned. [Published in Proceedings of the Royal Society A, 1930]. Endorsed on verso as received 11 March 1930. March 1930