Copy letter from Herbert Rix, to J Norman Collie, 16 Campden Grove, Kensington, W. 'Dear Sir, I have your note re the paper on Terpenes, and when I go away for my holiday I will leave instructions in accordance with it. The paper is still in the hands of the referees, & cannot therefore be sent to you yet. When it comes to you, you will remember, please, that every alteration in it must be dated, or else the whole paper re-dated. Yours faithfully Herbert Rix Asst. Sec. RS S [Assistant Secretary, Royal Society]'. 17 July 1891