Copy letter from Herbert Rix, to Professor P M Duncan, Fellow of the Royal Society, 15 Grosvenor Road, Gunnersbury 'Dear Sir, I am to inquire from you, in reference to your letter of April 4th, whether you have notified your resignation to the Secretary of the Governing Body of Charterhouse Shool, or whether you consider that that notification should come from the Officers of the Royal Society. The former would appear to be the more regular course, would it not? I am, yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 2 May 1891