Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons, St Martin's Lane 'Please prepare electros of the two figures illustrating Dr E. P. [Edgar Philip] Perman's paper on "Chemical Reaction between Salts in the Solid State" [Proceedings [of the Royal Society] A 530 pp 310-319] and send them with your account for the cost to the Editor od "The Chemical News", 16 Newcastle Street, Farringdon Street, London, E.C'. 17 June 1907