Referee's report by William Mitchinson Hicks, on a paper 'On the constitution of the mercury green line ? = 5461 Å. U., and on the magnetic resolution its satellites by an echelon grating' by John Cunningham McLennan Sectional Committee: Physics and Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests omitting figure seven. [Published in the 'Proceedings of the Royal Society of London', 1912] Endorsed on verso as received 23 May 1912. [May 1912]