Referee's report by George Francis Fitzgerald, on a paper 'The diffusion of ions produced in air by the action of a radio-active substance, ultra-violet light & point discharges' by John Sealy Edward Townsend Sectional committee: Physics and chemistry Recommended for publication in Philosophical Transactions, no modifications are necessary and all the accompanying illustrations should be reproduced. No general remarks given. [Published in Philosophical Transactions A, 1900]. Endorsed on verso as received 2 July 1900. 30 June 1900