Referee's report by Arthur Schuster, on a paper 'On luminous efficiency and the mechanical equivalent of light' by Charles V Drysdale Sectional Committee: Physics and Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London', but only a small portion, with notes on which portions should be included. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 9 August 1907. [August 1907]