Copy letter from Herbert Rix, to Ludwig Mond, 64 Via Sistina, Rome 'Dear Sir, Our President, Sir William Thomson desires me to assure you that your cheque has been forwarded to Professor Du Bois Reymond who is undertaking the arrangements in connection with the Helmholtz Memorial. I have sent the cheque to Berlin today. I am, yours faithfully, Herbert Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 18 April 1891