Copy letter from Herbert Rix, to Mr Apps, 433 Strand 'Dear Mr Apps, I find that the clerk to whom I gave the cheque to post kept it back in consequence of the discovery that it was not properly signed: I have now sent it to the President to complete the signature & have asked him to post it direct to you. Yours truly H Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 24 July 1889