Referee's report by Hugh Longbourne Callendar, on a paper 'The electrical conductivity of air and salt vapours' by Harold Albert Wilson Sectional Committee: Physics and Chemistry Not recommended for publication in Philosophical Transactions. The paper seems more suitable for the Philosophical Magazine. It is of too slight a character and some of the conclusions appear to be based on insufficient experimental evidence. The investigation of important points is left incomplete and the explanations are too vague and hypothetical. Some obvious sources of error are not mentioned. [Published in Philosophical Transactions A, 1901]. Endorsed on verso as received 2 April 1901. April 1901