Referee's report by Nevill Francis Mott, on a paper 'Operator calculus in the electron theory of metals' by K Fuchs Sectional committee: Physics He cannot report on the paper, as he doesn't have enough knowledge about operator calculus. The paper should be send to Paul Adrien Maurice Dirac instead. The author states that applications will be made in a later paper, but he thinks both papers shouldbe published together. [Published in Proceedings of the Royal Society A, 1940]. Endorsed on verso as received 16 April 1940. April 1940