Referee's report by John Charles Grant Ledingham, on a paper 'The use of nth order equations to describe the action of simple hoemolysins' by Eric Ponder and James Franklin Yeager Sectional committee: Physiology Recommended for publication in Proceedings, in full. He manages to combine mathematical skill with refined experiments, which results in the best possible numerical data. [Published in Proceedings of the Royal Society A, 1930]. Endorsed on verso as received 27 May 1930. May 1930