Referee's report by Robert John Strutt, Lord Rayleigh, on a paper 'On the origin of the auroral green line 5577 Å, and other spectra associated with aurora borealis' by John Cunningham McLennan and G M Shrum Sectional committee: Physics Recommended for publication in Proceedings, in full. It is a 'most substantial contribution to the solution of a long standing mystery'. [Published in Proceedings of the Royal Society A, 1925]. Endorsed on verso as received 1925. 1925