Referee's report by Horace Tabberer Brown, on four papers 'Studies on enzyme action. II.--The rate of the change, conditioned by sucroclastic enzymes, and its bearing on the Law of Mass Action' and ''Studies on enzyme action. III.--The influence of the products of change on the rate of change conditioned by sucroclastic enzymes' by Henry Edward Armstrong, 'Studies on enzyme action. IV.--The sucroclastic action of acids as contrasted with that of enzymes' by Edward Frankland Armstrong and Robert John Caldwell and 'Enzyme action as bearing on the validity of the Ionic-Dissociation Hypothesis and on the phenomena of vital change' by Henry Edward Armstrong Sectional Committee: not stated [Physics and Chemistry] Recommended for publication in the Proceedings. They are a very valuable contribution to a subject which is of equal importance to the chemist, the physicist, and the physiologist. [All papers published in Proceedings of the Royal Society, 1904] Endorsed on recto as received 11 May 1904. 10 May 1904