Referee's report by Edmund Taylor Whittaker, on a paper 'The velocity of sound in general relativity, with a discussion of the problem of the fluid sphere with constant velocity of sound' by A R Curtis Sectional committee: Mathematics Recommended for publication in Proceedings. Papers 'developing the original theory of general relativity should be accepted if they show ability and other good qualities' [Published in Proceedings of the Royal Society A, 1950]. Date received not given. 1949