Copy letter from Herbert Rix, to John Evans, Treasurer, Royal Society 'Dear Sir, Please see enclosed estimate. The matter is pressing, as the plates have already been sadly delayed. It is a lot of money in either case, & yet I think it would be better to accept the dearer, especially as the number of plates has already after much consultation & pressure put upon the author, been cut down. Yours truly Herbert Rix Asst Sec [Assistant Secretary, Royal Society]'. 18 July 1891