Copy letter from Robert William Frederick Harrison, to [Messrs Harrison & Sons] 'Please prepare electros of the two blocks illustrating Mr R. J. [Robert John] Strutt's paper on The Distrubution of Radium in the Earth's Crust, etc", and send them, with your account, to the Editor of 'The Chemical News', 16 Newcastle Street, Farringdon Street, London, E.C.'. 2 May 1906