Referee's report by William Edward Ayrton, on two papers 'A study of the Planté lead-sulphuric acid-lead peroxide cell, from a chemical stand-point. Part I' and 'A study of the Planté lead-sulphuric acid-lead peroxide cell, from a chemical stand-point. Part II.—A discussion of the chemical changes occurring in the cell' by G H Robertson and H E Armstrong Part I is recommended for publication in Philosophical Transactions, although the headings of the tables should be made clearer. Part II is of greater difficulty to understand and it does little to advance the points made in part I. The papers shouldn't be presented as a joint paper. Subject: Chemistry [Both papers published in Proceedings of the Royal Society, 1891]. 19 August 1891