Referee's report by Edmund John Bowen, on a paper 'A study of the reactions that lead to 'knock' in the spark ignition engine' by Diarmuid Downs, Arthur Donald Walsh and R W Wheeler Sectional committee: Engineering Paper reference code: A223 Recommended for publication in the Philosophical Transactions with Bowen's remarks on the papers writing being not concise but the style making it difficult to shorten, and discusses the importance of the results presented. [Published in Philosophical Transactions A, 1951]. Date received not given. 14 December 1950