Referee's report by John Allen Harker, on a paper 'On the viscosities of the hydrogen halides' by H Harle Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Has not had time to review as fully as usual due to work commitments. Considers the methods concerning liquid to be 'quite ingenious'. [Published in the 'Proceedings of the Royal Society of London' A, 1922] No received date. [1921]