Referee's report by Nevil Vincent Sidgwick, on a paper 'The structure of melamine, C3N6H6' by Ellie Knaggs and Kathleen Yardley Lonsdale Sectional committee: Chemistry Recommended for publication in Proceedings. He cannot judge the crystallographic part of the paper, which should be submitted to someone else. The chemical part is interesting and the conclusions seem probable. [Published in Proceedings of the Royal Society A, 1940]. Endorsed on verso as received 18 September 1940. September 1940