Copy letter from Herbert Rix, to Dr W G Spencer 'Dear Sir, I believe you have had in your hands since May 30 proofs of text, blocks and plates of your paper. We are waiting for their return, and should be glad to get the paper out before the vacation if possible. I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 18 June 1894