Referee's report by Richard Whiddington, on three papers 'The mobility of alkali ions in gases, I. The attachment of water molecules to alkali ions in gases' by R J Munson and Arthur Mannering Tyndall, 'The mobility of alkali ions in gases II. The attachment of inert gas atoms to alkali ions' by R J Munson and K Hoselitz, and 'The mobility of alkali ions in gases III. The mobility of alkali ions in water vapour' by R J Munson Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests combining them into one paper. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 9 May 1939. 8 May 1939