Referee's report by Samuel Walter Johnson Smith, on a paper 'A note on “ The significance of the electrode potential'' by John Alfred Valentine Butler Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. The paper is a criticism of a paper by Jaroslav Heyrovský published in the Proceedings for 1923. Considers the paper a 'fair criticism' of the other paper, but whilst publication 'may serve a useful purpose', it does not have much constructive value. [Published in the 'Proceedings of the Royal Society of London' A, 1923] Endorsed on verso as received 24 October 1923. [October 1923]