Copy letter from Herbert Rix, to the Cambridge Engraving Company, St Tibbs' Row, Cambridge 'Dear Sirs, In answer to your letter of the 3rd inst. [instant], Mr Haycroft's instruction to you was not quite in order, as he had not applied to the Council for leave to republish his plates. I have now, however, obtained permission from the President and Secretaries, and you may proceed to execute Mr Haycroft's order, of course at his own expense. Yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 5 June 1891