Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Hugh Longbourne] Callendar, Chairman of the Physics and Chemistry Committee and FRS Informs Professor [Hugh Longbourne] Callendar that December 11th is suitable for a meeting of the [Physics and Chemistry] Committee as far as room availability goes. Notes that before confirming they should await the return of Dr. [Arthur] Schuster from Paris, who will want to attend. 3 December 1918