Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons 'Ramsay & Travers: "The preparation & some of the properties of pure Argon" (Roy. Soc. Proc. [Proceedings of the Royal Society] No. 4 & 6, pp. 186 & 188) Please make cliches of the two figures to be found at the above reference, and send them to:- Dr George F Jaubert, Revue Generale de Chimie Pure et Appliquee, Boulevard Malesherbes 155, Paris. Kindly give this matter your prompt attention'. 3 February 1899