Copy letter from Herbert Rix, to Dr John Denis Macdonald, Fellow of the Royal Society 'Dear Sir, Your paper on Oscillatoriaceae which is intended, I presume, for the Proceedings ['Proceedings of the Royal Society]?) has come to hand. Unfortunately last Thursday was the last meeting of the Society this session, so I fear it will be some time before the paper can be read. I am yours faithfully H Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 22 June 1889