Referee's report by Alfred Gordon Gaydon, on a paper 'Vibration spectra of hydrocarbon molecules - II. Skeletal frequencies in certain branched paraffins' by Delia M Simpson and Gordon Brims Black Mcivor Sutherland Sectional committee: Physics Recommended for publication in Proceedings. This copy doesn't include the usual summary but and abstract should be included in the published version. [Published in Proceedings of the Royal Society A, 1949]. Date received not given. 1949