Referee's report by Thomas Ralph Merton, on a paper 'Studies in the behaviour of hydrogen and mercury at the electrode surfaces of spectrum tubes' by M C Johnson Sectional committee: Physics Recommended for publication in Proceedings, in full. The paper is an 'interesting contribution' and the conclusions seem justified, but the author has made no mention of the well known effect of mercury contamination. [Published in Proceedings of the Royal Society A, 1928]. Endorsed on verso as received 23 February 1928. February 1928