Copy letter from Herbert Rix, to Professor George Murray Humphry, Fellow of the Royal Society 'Dear Sir, It appears from our pass-book that your bankers paid your annual contribution to Messrs Robarts & Co, & from our conterfoils it appears that you also paid the same ann. [annual] contribution direct to this office. Herewith I enclose cheque for £4 in repayment. Kindly acknowledge receipt. Yours faithfully, H Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 9 July 1889