Referee's report by Cecil Reginald Burch, on a paper 'Perturbation characteristics and their application to electron optics' by P A Sturrock Sectional committee: Mathematics Paper reference code: A90 Recommended for publication in the Philosophical Transactions. Burch remarks this paper is 'too far outside' his 'line' for him to be able to understand it, and suggests the paper be sent to another referee. [Published in Proceedings A, 1951]. Date received not given. 18 April 1951