Referee's report by James Chadwick, on a paper 'The variation of the mobility of gaseous ions with temperature I–Positive ions in their own gas' by Arthur Mannering Tyndall and A F Pearce Sectional Committee: Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests the results are presented in a tabulated form, but if the authors' reject the suggestion he would accept their decision. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 5 February 1935. [February 1935]