Jim felt as if an enormous, invisible force had struck him in the chest. It was apparently the same repulsive force that had driven back the waters. The shock was not a violent one. It did not throw him off his feet. It merely pushed him slowly and irresistibly backward. And the whole picture was beginning to fade. Etched sharply in the violet light one moment, it now looked like a drawing that had been covered with tissue paper. The outlines were dissolving into a haze--or, rather, each line seemed reproduced an infinite number of times, as the edge of a vibrating saw shows an infinitude of edges. The violet fire was becoming still more diffused. It hovered over the waters, a pale, flickering glow. And simultaneously the walls of water began to break and come surging forward. Jim saw Lucille stretching out her arms toward him, and tried to struggle forward, but in vain. She cried out his name, and he put all his strength into that desperate futile struggle to reach her. But he was being borne backward by the invisible power in the tube. The rushing torrent was surging about his knees; grew waist deep: in another moment Jim was swimming for his life against the furious flood. Suddenly, however, the tremendous pressure on his chest was relaxed. Tode had turned the tube away from him. He was leaning forward out of the boat and grasped old Parrish, who had been flung violently against it by the dissolving waters. The same flood carried Jim to the boat's side. Here, however, the flood was only knee deep, owing to the repulsion still being exercised by the violet light, which was glimmering feebly. Jim found his feet and leaped into the craft. He grasped Lucille in his arms. * * * * * He turned to confront Tode, who had just dragged old Parrish over the side. The three men confronted one another. "Turn that tube on me, and I'll jump into your damn machinery and bust it!" Jim shouted. An ironical expression came on Tode's face. It was clear that he still considered himself master of the situation. "At the immediate moment, Dent, the lives of all of us depend upon your keeping absolutely still," he answered. "Take my advice and sit down!" Jim saw Lucille's face, ghastly in the faint violet light that played about it. The girl had fainted. She was lying unconscious, her feet against the circular metal plate that protected the machinery, her head upon the rail that ran around the boat's upper edge. Tode, without waiting for Jim's answer, stepped over the plate and took his seat at a sort of instrument board with control levers and thumb screws that apparently controlled the needles on four dials. He touched a button, and instantly the violet light disappeared. With its vanishing, the waves came surging forward, and lapped violently against the hull, as if about to overwhelm the vessel, which, however, seemed immovable. It simply rose higher in the water.