Copy letter from Herbert Rix, to Professor Joseph Norman Lockyer, Fellow of the Royal Society 'Dear Sir, In accordance with a note received from Mr Fowler this morning, I am directed to send you the enclosed 3 copies of the proof of your paper "On the Chief Line in the Spectrum of the Nebula". I am, at the same time instructed to say that the paper has not yet been passed by the Committee for publication. I am, yours faithfully Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 23 April 1891