Whatever surprise it was to Alan, the Indian within was undoubtedly far more surprised. Alan stuck his foot into the door opening; he shoved violently with his powerful body, his shoulder against the door. It yielded; opened wide with a rush, knocking the Indian backward. Alan burst into the room. The Indian, unarmed, recovered his balance to find himself staring at Alan's leveled revolver. "Don't you move! Put your hands up!" Behind him, Charlie yelped shrilly: "He can't understand English! He's a Mohican!" But Alan's menace was enough; the fellow backed against the wall. His hands went up. "You've got him! You've got him!" "Charlie, shut up!" A confusion of swift impressions surged upon Alan. A small, bare room with a vague glow of light. The girl was here! She stood near the Indian. Frightened, shrinking against the wall; but she saw Alan, recognized him. She took a step forward. Charlie was making too much noise. The door through which Alan had burst was open. If Turber saw the glow of light--or heard Charlie's voice--or if any one else heard this uproar-- A confusion of instantaneous impressions. "Charlie, shut up! You'll have the whole place aroused! Take the girl out--she'll go with you! Grab her arm--we'll make a run for it." The girl understood. If not Alan's words, at least his swift gestures. She moved toward Charlie. Alan backed, his weapon leveled upon the Indian. "Go on! Run, Charlie! Get her out at once! I'll follow. Get us to the tennis court." Alan backed, with the two of them behind him. He had been in that room certainly not over thirty seconds. He left it with Turber's secret laid bare to him! The room had an archway, opening inward. Alan had stood facing it. Charlie had seen it and yelped with excitement. In the inner court stood a large gray-white vehicle--a cabin airplane. A spread of canvas for a concealing roof was over it. A vehicle for traveling through Time--like the Time-traveling tower we had seen in Central Park! CHAPTER V THE FLIGHT IN CENTRAL PARK Alan found himself outside the laboratory. Its door was open, with a yellow glow streaming out. Charlie, clinging to the girl, was with him. The glow fell on them; Alan shoved them aside. "Which way, Charlie? We've got to get out of here!" They stood in the darkness a moment against the laboratory wall. The hospital was aroused. A voice had shouted. Others were taking it up. Lights were showing in several of the windows. An uproar--growing now of its own momentum. Some one lighted a light in the reception room. A shade snapped up. The courtyard was brightening with yellow glints of light. No one as yet seemed to notice the three figures standing by the wall. "Which way, Charlie?" Alan was momentarily confused. They would have to pass through the lower part of the building, get into the garden, fight their way through if necessary.