Referee's report by John Edward Lennard Jones, on a paper 'A note on the spectrum of the frequencies of a polar crystal lattice' by Max Born and J H C Thompson Sectional committee: Mathematics Recommended for publication in Proceedings, in full. The paper provides an important advance in the subject. [Published in Proceedings of the Royal Society A, 1934]. Endorsed on verso as received 21 August 1934. 17 August 1934