Referee's report by Robert Whytlaw-Gray, on a paper 'An attempt to detect the passage of helium through a crystal lattice at high temperatures' by Robert John Strutt, Lord Rayleigh Sectional committee: Physics Recommended for publication in Proceedings, in full. It is of interest because it shows that the passage of helium was found to be minute. [Published in Proceedings of the Royal Society A, 1937]. Endorsed on verso as received 1 October 1937. 29 September 1937