Copy letter from Edward Neville da Costa Andrade, to Mrs. [Kathleen Yardley] Lonsdale, The Royal Institution, 21 Albermarle Street, London, W. 1 Responding to her previous letter [MS/965/1] regarding Professor [William Thomas] Gordon's diamond. Recalls the diamond was returned to Sir Robert Robertson, commenting that his own work on it was completed between 1934 and 1935. Informs that his assistant and the student who was taking photographs at the time both confirm its return. Adds that his 'laboratory, with all its content, has been completely destroyed by a parachute mine'. 2 July 1941