Referee's report by John Sealy Edward Townsend, on a paper 'The effect of water vapour on the diffusion coefficients of ions in nitrogen and oxygen' by J J Nolan and A C Galvin Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests reducing the number of observations given in table four. [Published in the 'Proceedings of the Royal Society of London' A, 1933] Endorsed on verso as received 31 December 1932. [December 1932]