Referee's report by Edward Frankland Armstrong, on two papers 'A new interference method of measuring the surface area of film catalysts. Part I.—The theory' and 'A new interference method of measuring the surface area of film catalysts.—Part II. Nickel—A method of preparation of the film, and an apparatus for activation, and study of the surface area' by F Constable Sectional committee: Chemistry Recommended for publication in Proceedings, in full. The papers are a useful advance in techniques. [Both papers published in Proceedings of the Royal Society A, 1928]. Endorsed on verso as received 24 March 1928. March 1928