Copy letter from Herbert Rix, to Monsieur H Welter, Rue Bonaparte, 59, Paris [France] 'Dear Sir, In answer to your post-card received today, I enclose a wrapper upon which you will find advertised the selling prices of all the Philosophical Transactions ['Philosophical Transactions of the Royal Society'] & Proceedings ['Proceedings of the Royal Society'] which remain in print. We allow 25 per cent discount on any quantity large or small. Yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 31 October 1891