Copy letter from Robert William Frederick Harrison, to Sir William Turner Thiselton-Dyer, Fellow of the Royal Society 'Dear Sir William, I have to acknowledge the receipt of your letter of the 18th. instant, which I will lay before the Secretaries at the earliest opportunity. I am, Yours faithfully, Robert Harrison Asst. Sec. R. S. [Assistant Secretary, Royal Society]'. 20 January 1902