Referee's report by Harold Warris Thompson, on a paper 'Vibration spectra of hydrocarbon molecules I. Frequencies due to deformation vibrations of hydrogen atoms attached to a double bond' by Norman Sheppard and Gordon Brims Black Mcivor Sutherland Sectional committee: Physics Recommended for publication in Proceedings. It is of considerable interest to specialists in the field. The authors should try to condense the paper without loss of clarity. [Published in Proceedings of the Royal Society A, 1949]. Date received not given. 1948