Referee's report by George Gerald Henderson, on a paper 'The catalytic action of copper. Part VI.—An explanation of the reproducibility of the catalyst, and of the period change in its activity, together with some experiments on the activation of the catalyst by alternate oxidation and reduction' by F H Constable Sectional Committee: Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. The paper is a continuation of a series. [Published in the 'Proceedings of the Royal Society of London' A, 1925] Endorsed on verso as received 25 November 1924. [November 1924]