It was eleven o'clock at night when Surgeon Wyley of His Majesty's ship Bonetta washed his hands, drew on his coat, and walked from the hospital up the narrow cobbled street of Tangier to the Main-Guard by the Catherine Port. In the upper room of the Main-Guard he found Major Shackleton of the Tangier Foot taking a hand at bassette with Lieutenant Scrope of Trelawney's Regiment and young Captain Tessin of the King's Battalion. There were three other officers in the room, and to them Surgeon Wyley began to talk in a prosy, medical strain. Two of his audience listened in an uninterested stolidity for just so long as the remnant of manners, which still survived in Tangier, commanded, and then strolling through the open window on to the balcony, lit their pipes. Overhead the stars blazed in the rich sky of Morocco; the riding-lights of Admiral Herbert's fleet sprinkled the bay; and below them rose the hum of an unquiet town. It was the night of May 13th, 1680, and the life of every Christian in Tangier hung in the balance. The Moors had burst through the outposts to the west, and were now entrenched beneath the walls. The Henrietta Redoubt had fallen that day; to-morrow the little fort at Devil's Drop, built on the edge of the sand where the sea rippled up to the palisades, must fall; and Charles Fort, to the southwest, was hardly in a better case. However, a sortie had been commanded at daybreak as a last effort to relieve Charles Fort, and the two officers on the balcony speculated over their pipes on the chances of success. Meanwhile, inside the room Surgeon Wyley lectured to his remaining auditor, who, too tired to remonstrate, tilted his chair against the wall and dozed. "A concussion of the brain," Wyley went on, "has this curious effect, that after recovery the patient will have lost from his consciousness a period of time which immediately preceded the injury. Thus a man may walk down a street here in Tangier; four, five, six hours afterwards, he mounts his horse, is thrown on to his head. When he wakes again to his senses, the last thing he remembers is-what? A sign, perhaps, over a shop in the street he walked down, or a leper pestering him for alms. The intervening hours are lost to him, and forever. It is no question of an abeyance of memory. There is a gap in the continuity of his experience, and that gap he will never fill up." "Except by hearsay?"