Copy letter from Robert William Frederick Harrison to The Scientific American, 361 Broadway, New York 'In reply to your letter of March 5th, I have instructed our printers to prepare and forward blocks of the illustrations in the paper by Mr C T R Wilson, on the assumption that you have obtained the permission of that gentleman to reproduce them. This is done, of course, subject to the formal consent of Council, which, however, may be anticipated.' 31 March 1913