Second referee's report by Arthur Hutchinson, on a paper 'The structure and formula of 12-phosphotungstic acid' by J F Keggin Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. The new introduction should be submitted for the old one in the manuscript. [Published in the 'Proceedings of the Royal Society of London' A, 1934] Endorsed on verso as received 18 December 1933. 15 December 1933