Referee's report by Alexander Craig Aitken, on a paper 'An invariant form for the prior probability in estimation problems' by Harold Jeffreys Sectional committee: Mathematics Recommended for publication in Proceedings. He can give no comments of value, as the author's point is so remote from his. The mathematics seems sound enough and he won't let his prejudice stand in the way. [Published in Proceedings of the Royal Society A, 1946]. Date received not given. 1945