Referee's report by Horace Tabberer Brown, on 'Studies on enzyme action. X. — The nature of enzymes' by Henry Edward Armstrong and Edward Frankland Armstrong Sectional Committee: Physics and Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 14 May 1907. [May 1907]