Second referee's report by George Clarke Simpson, on a paper 'Measurement of the biologically active ultra-violet rays of sunlight' by Leonard Erskine Hill Sectional committee: Physics Recommended for publication in Philosophical Transactions, in full. He recommends it 'with reluctance', as the work 'leaves much to be desired'. Despite this, the work is still 'of interest and not without value'. The paper should be revised before publication, as it is presented in a 'slovenly way'. [Published in Proceedings of the Royal Society A, 1927]. Endorsed on verso as received 8 April 1927. April 1927