Copy letter from Herbert Rix, to M Alphonse Louis Pierre Pyramus de Candolle, Foreign Member of the Royal Society In the absence of Professor A Williamson from London, Rix writes to acknowledge receipt of de Candolle's letter of 25 September and to say that he has ordered the Royal Society's publishers to send de Candolle a copy of the missing sheet containing the title and index of volume XXXIX of the 'Proceedings of the Royal Society'. 28 September 1887