Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society, 7 Horbury Crescent, Notting Hill, W. 'Dear Professor Ayrton, Professor [Arthur William] Rücker has written a Report which he says contains the substance of your joint report. I will send you a proof of Mr [Henry] Wilde's paper if you like, but perhaps this will obviate the necessity of your worrying about it while you are still so poorly. I am glad to know that you are improving in health & remain, Yours truly Herbert Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 18 February 1891