Copy letter from Herbert Rix, to Messrs Harrison & Son 'P. F. [Percy Faraday] Frankland. Roy. Soc. Proc. vol. 57 ['Proceedings of the Royal Society' volume 57), pp. 442, 445, & 448. Please make cliches of the three diagrams in the above paper and send them to: - "Messrs A. King & Co., Printers to the University, Aberdeen." Your account for the same is to be sent to: - "The Manager, Scientific Press, Ltd [Limited], 428 Strand, W.C." HR'. 23 April 1896