Copy letter from Robert William Frederick Harrison, to Sir Henry Trueman Wood, Society of Arts, John Street, Adelphi, W.C. 'I shall be glad to know whether the illustrations of colour photography you have been good enough to consent to show at our Soiree lend themselves to a lantern demonstration and, if so, whether you would be inclined to let your exhibit take the form of a short exposition in the lecture room in the course of the evening. Believe me, Very truly yours, Robt Harrison Asst. Sec. R. S. [Assistant Secretary, Royal Society]'. 28 April 1897