Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Messrs Harrison & Sons 'Please prepare electros of following 4 blocks and send to Editor of "Nature", Macmillan & Co., St. Martin Street, amd charge him for same:- Proceedings B., Vol. 90, 1919. Paper by [Jagadis Chunder] [Guruprasanna] Bose and Das. Fig. 2 - p. 371 Fig. 8 - p. 380 Fig. 5 - p. 373 Fig. 13 - p. 389.' 7 June 1920