Referee's report by Nevill Francis Mott, on a paper 'Crystal theory of metals: calculation of the elastic constants' by Klaus Fuchs and H W Peng Sectional Committee: Mathematics Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests revising the use of English. Contains extra question - 'Is there any information contained in the paper which likely to be of value to the enemy?' Referee replies no. [Published in the 'Proceedings of the Royal Society of London'] No received date. [1941]