Referee's report by Hugh Longbourne Callendar, on a paper 'The evaporation of water in a current of air' by Edgar Philip Perman Sectional Committee: Physics and Chemistry Recommended for publication in Proceedings. A good deal of the historical portion might be omitted. Does not discuss modification. Both illustrations should be reproduced but in a much reduced size. In general he thinks the method familiar and the author's verification does not mark a great advance in accuracy. The results for the vapour pressure are too exact considering that they are obtained by assuming the relative density constant which is certainly not true. [Published in Proceedings of the Royal Society, 1903] Endorsed on verso as received 7 March 1903. March 1903]