Referee's report by William Maddock Bayliss, on the Croonian Lecture 'Upon the motion of the mammalian heart' by Thomas Lewis Sectional Committee: Physiology Recommended for publication in the 'Proceedings of the Royal Society of London'. Corrects a name in the manuscript, referring to Walter Holbrook Gaskell. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 17 May 1917. [May 1917]