Referee's report by William Cecil Dampier Whetham, on a paper 'The accurate measurement of ionic velocities' by R B Denison and Bertram Dillon Steele Sectional Committee: Physics and Chemistry Recommended for publication in Philosophical Transactions, in full. There are only two figures, both of which should be reproduced. On an appended page Whetham lists seven changes which he thinks desirable, with references to the page of the original paper. [Published in Philosophical Transactions A, 1906]. Endorsed on verso as received 31 October 1905. October 1905