Referee's report by Horace Lamb, on a paper 'On “light body” hydrophones and the directional properties of microphones' by A B Wood and F B Young Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests omitting the summary and reducing the size of the images and omitting others. [Published in the 'Proceedings of the Royal Society of London' A, 1921] Endorsed on verso as received 22 March 1921. [March 1921]