Referee's Report by [David] Keilin on a paper 'Chemical mechanism of the oxidation of protohaematin to verdohaematin' by [Rudolf] Lemberg, B Cortis-Jones, and M Norrie Paper reference code: B.173 Sectional Committee: Physiology Does not recommend for publication. Manuscript note directs reader to 'see previous report' [RR/W/5/112] for comments. [Not published in Royal Society journals but had been announced in Nature, 139, pp.1016-1017, 1937 and in full in the Biochemical Journal, 32 (1), pp.149-170, 1938]. Received 30 September 1937 [September 1937]