Referee's report by Frederick Soddy, on a paper 'The decay constant of Uranium II' by C H Collie Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Makes some suggestions for printing the figures. The author should make reference to a relevant work of the referee. [Published in the 'Proceedings of the Royal Society of London' A, 1931] Endorsed on verso as received 31 January 1931. [January 1931]