Referee's report by Joseph Larmor, on a paper 'The compressibility of gases between one atmosphere and half an atmosphere of pressure' by John William Strutt, Lord Rayleigh Sectional Committee: Physics and Chemistry Recommended for publication in Philosophical Transactions, in full. Modifications are not discussed. All the accompanying illustrations should be reproduced. No general remarks given. [Published in Philosophical Transactions A, 1905]. February 1905