Copy letter from Herbert Rix, to Messrs Clay & Sons, University Press, Cambridge 'Dear Sirs, "Catal. Scientif. Papers" ['Catalogue of Scientific Papers'] The slips at present in your hands will be sufficient to finish the first of the three volumes which form the new decade. I should be glad to know whether you think we ought to have a proof binding, or whether it will be sufficient for you to take a volume from the previous decade as pattern. The binding should of course accurately match that of the previous decade. Yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 6 July 1891