Copy letter from Robert William Frederick Harrison to Professor A [Alfred] Fowler FRS 'Dear Sir, At the suggestion of Sir Joseph Larmor, I am sending you the enclosed paper by Mr Percival Lowell on the Spectrum of Halley's Comet, together with two photographs. I am to ask your opinion as to whether the paper in sufficiently original for publication in the Proceedings and whether the photographs are in that case necessary; they will be rather expensive to reproduce. We shall be glad to have your reply as soon as possible.' 19 October 1910