Referee's report by Alexander Oliver Rankine, on a paper 'The quantitative analysis of the photochemical bleaching of visual purple solutions in monochromatic light' by H J A Dartnall, Charles Frederick Goodeve and Richard James Lythgoe Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Criticises the use of symbols and definitions as unclear. Asks if the authors have missed a potentially important decrease of values in table I. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 15 April 1936. [April 1936]