On an evening in 1866 (exactly eight hundred years after the Battle of Hastings) Mr. Henry Knight, a draper's manager, aged forty, dark, clean-shaven, short, but not stout, sat in his sitting-room on the second-floor over the shop which he managed in Oxford Street, London. He was proud of that sitting-room, which represented the achievement of an ideal, and he had a right to be proud of it. The ri...