Second 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'. The paper has been modified to meet the earlier citicisms. Suggests the author clarify and define his use of the symbol lambda. [Published in the 'Proceedings of the Royal Society of London'] No received date. [1939]