Copy letter from Herbert Rix, to Professor John M Macfarlane, University of Pennsylvania, Philadelphia, U.S.A. 'Dear Sir, I have to acknowledge receipt of your letter of the 27th February, which shall be laid before the "Challenger" Committee when they meet. I may, however, at once inform you that there are no complete sets left of the "Reports" in question. Whether there are any broken sets I cannot say. I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 13 March 1896