Referee's report by John Edward Lennard-Jones, on a paper 'The compressibilities and expansion coefficients of gases at low pressures, and their relation to molecular volume' by J B M Coppock Sectional Committee: Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. Finds it a retrograde step to discuss the subject in terms of molecular volume. Suggests the paper be revised to show the relation to the work of others. Refers to work of Joseph Oakland Hirschfelder and W E Roseveare. Suggests adding definitions for the symbols. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on recto as received 9 June 1939. 8 June 1939