Referee's report by Paul Peter Ewald, on a paper 'The measurement of particle size by the X-ray method' by Frederic Wood Jones Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Provides detailed criticism of the formulae, and places where further explanation is necessary. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 1 December 1937. [December 1937]