Letter from Cyril Norman Hinshelwood, on a paper 'The theoretical rate of isomerization of cyclopropane' by N B Slater, to D C Martin, assistant secretary of the Royal Society Paper reference code: A11 Hinshelwood remarks that Slater has published the same kind of 'general treatment' but the results cannot be assessed or criticised unless these details can be used, refers to Coulson's comments on the paper, and uncertainties in the method. Written at Physical Chemistry Laboratory, South Parks Road, Oxford [England]. [Published in Proceedings A, 1953]. Endorsed on recto as received 10 March 1953. 7 March 1953