Copy letter from Robert William Frederick Harrison to Messrs Harrison & Sons 'Kindly prepare and forward with your account to The Editor, Le Radium, 91 Rue Denfert-Rochereau, Paris, electros as follows:- 1. W C Ball, Proc[eedings] A 87, p127, Nos 6, 7 & 10 of plate 1. 2. T R Merton, Proc A 87, P145, fig 3. 3. R J Strutt, Proc A 86, p531, fig 2.' 6 March 1913