Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons 'Please prepare at once electros of the figures on Plate 1, Roy. Soc. Proc. Vol. A [Proceedings of the Royal Society, Volume A] 77 (Lowell) ^facing p135^ and forward to A. B. Tucker, Esq [esquire] editor of the Graphic, Tallis Street, Victoria Embankment, E.C. Please note that these blocks are required as early as possible'. 13 July 1907