Copy letter from Herbert Rix, to Professor Boyce, Pathological Laboratory, University College, W.C. 'Dear Sir, Will you let me know what to answer to the inclosed memo. [memorandum] from the Cambridge Engraving Co. [Company]? Find, also, two photographs with the same. Yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 7 October 1893