Copy letter from Herbert Rix, John Batty Tuke, Curator Research Laboratory, Royal College of Physicians, Edinburgh 'Dear Sir, I have the pleasure to inform you that the President & Council of the Royal Society have sanctioned the exchange of the "Proceedings" of this Society ['Proceedings of the Royal Society'] for your laboratory reports, in accordance with your request. Some members of the "Proceedings" should already have reached you from our Printers? Yours truly Herbert Rix Asst Sec [Assistant Secretary]'. 15 November 1889