Referee's report by Robert Whytlaw-Gray, on a paper 'The physical investigation of certain hygroscopic aerosols' by D W E Axford, K F Sawyer and Theodore Morris Sugden Sectional committee: Chemistry Recommended for publication in Proceedings. The first part of the paper is of considerable interest and contains valuable results. It could be improved by adding a few experimental details. The second part of the paper could be published elsewhere as it doesn't support the conclusions of the first part. [Published in Proceedings of the Royal Society A, 1948]. Endorsed on recto as received 29 October 1947. October 1947