Copy letter from Herbert Rix, to Dr Hugo Müller, Fellow of the Royal Society 'Dear Sir, May I remind you of your promise to write to Mr L Mond in reference to a new nickel compound proposed for exhibition at the Soirée. We have not heard from Mr Mond, so the matter may possibly have escaped your memory. Time is getting short for the arrangement of exhibits, and we should like to know early about it. Yrs [Yours] faithfully, Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 17 April 1891