Referee's report by Alexander Craig Aitken, on a paper 'The tests for sampling differences and contingency' by Harold Jeffreys Sectional Committee: Mathematics Recommended for publication in the 'Proceedings of the Royal Society of London'. Does not agree with the author's conception of probability. The ideas presented are interesting and important. 'Anyone who reads and disagrees is forced to clarify his own opinions on the matters treated; and this seems to me one good reason for publication'. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 30 August 1937. [August 1937]