Copy letter from Herbert Rix, to Ernest Howard Griffiths, 2 Parkside, Cambridge 'Dear Sir, I am glad you are pleased with the plates. In answer to your question, I fear it will still be two or three weeks before you get your separate copies, even if no unforeseen hitch occurs. Yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 16 February 1891