Copy letter from Herbert Rix, to Professor Karl Pearsson, University College, Gower Street, W.C. 'Dear Sir, Thanks for your note. What I propose to do is, first, to try whether the correction can be made on the engraved stone. I sometimes find that which is "impossible" can be done. If the engraver fails in this, I will send you lithographed proofs transferred from the engraved stone, and we shall see how they come out. Yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 24 February 1894