Referee's report by Bernard Katz, on a paper 'The energy requirement for sodium extrusion from a frog muscle' by Richard Darwin Keynes and G W Marshall Sectional committee: Physiology Paper reference code: B.38 Recommended for publication in the Proceedings, though the referee believes the authors should have pursued the matter of metabolic inhibitors further. [Published in Proceedings B, 1954]. Date received not given. 6 October 1953