Copy letter from Herbert Rix, to the Cambridge Scientific Instrument Company 'Herewith Horsely [Victor Alexander Haden Horsely] and Schafer [Edward Albert Schafer], 7 plates for press. Delay apparently caused by absence on Continent of one of the authors. I send with the 7 proofs one of the originals which you will want for the rectification of figs [figures] 37, 38. Please see that this is returned to me'. 5 January 1888