Second referee's report by Harold Jeffreys, on a paper 'Notes on a differential equation which occurs in the two-dimensional motion of a compressible fluid and the associated variational problems' by Harry Bateman Sectional Committee: Mathematics Recommended for publication in the 'Proceedings of the Royal Society of London'. The paper has been made clearer and more intelligible. [Published in the 'Proceedings of the Royal Society of London' A, 1929] Endorsed on verso as received 6 August 1929. [August 1929]