Referee's report by Frederick Gowland Hopkins, on a paper 'Urochrome as a derivative of chlorophyll' by Herbert E Roaf Sectional Committee: Physiology Not recommended for publication in the 'Proceedings of the Royal Society of London'. The proofs are inconclusive and the 'observations on human subjects are unconvincing'. The last part should be omitted. [Not published] Endorsed on verso as received 29 September 1921. [September 1921]