Copy letter from Herbert Rix, to Messrs Clay & Son, University Press, Cambridge 'Dear Sir, Herewith enclosed I send receipt for the twenty-five blocks which have safely arrived. The specimen proofs of the catalogue are also to hand and will be returned to you with any necessary remarks as soon as they have been seen by the officers. I am, yours faithfully, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 25 April 1889