Copy letter from Herbert Rix, to L I Cadell, 24 Charlotte Square, Edinburgh 'Dear Sir, Unfortunately these particular years of "Philosophical Transactions" ['Philosophical Transactions of the Royal Society'] which you offer to us are volumes of which we already have a superabundant stock. We cannot, therefore, make you an offer for them, as we should have been glad to do had they been prior to the year 1800. Yours faithfully, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 25 November 1893