Referee's report by Arthur Mannering Tyndall, on a paper 'The formation of negative ions by positive-ion impact on surfaces' by R H Sloane and R Press Sectional committee: Physics Recommended for publication in Proceedings. Two of the figures could be plotted together. The paper is nice and the technique is superior to previous papers on a similar topic. [Published in Proceedings of the Royal Society A, 1938]. Endorsed on verso as received 4 August 1938. August 1938