Referee's report by Charles Sykes, on a paper 'The occurrence and the crystal structure of a"-iron nitride - a new type of interstitial alloy formed during the tempering of nitrogen-martensite' by Kenneth Henderson Jack Sectional committee: Engineering Paper reference code: A213 Sykes is 'doubtful' the paper should be published by the Royal Society, and recommends it would be better suited in the Acta Crystallographa. [Published in Proceedings A, 1951]. Date received not given. 6 December 1950