Referee's report by Frank Twyman, on a paper 'On experimental and theoretical problems of photography I and II' by J E P Wagstaff and W A Prowse Sectional Committee: Physics Recommended for publication in the 'Philosophical Transactions of the Royal Society'. Suggests amking the conclusions more complete, more clearly defining the symbols used and outlining the nature of the lumen meter. [Not published] Endorsed on verso as received 12 March 1935. [March 1935]