Referee's report by John Douglas Cockcroft, on a paper 'Experiments on iron ammonium alum in alternating fields at very low temperatures' by A H Cooke and R A Hull Sectional committee: Physics Recommended for publication in Proceedings, in full. The paper is practically and theoretically interesting. He would like to see the measurements extended over a wider range of temperature frequency. [Published in Proceedings of the Royal Society A, 1937]. Endorsed on verso as received 15 July 1937. July 1937