The laboratory was trembling. The mountain beneath it was trembling. Both in accordance with scientific design. There was no element of chance in it, for the mountain moved, and the laboratory on its crest moved, as science willed. It was now difficult for Sarka to remain still where he sat, for the trembling was exciting his heart action, and causing the blood to rush to his cheeks, making him feverish. He rose to his feet and began pacing the floor. He strode to the jade lever, moved it ahead a fraction of a fraction of an inch, and perceptibly the murmuring of the Beryl increased, as did the trembling of the laboratory and of the mountain. * * * * * Twelve hours later exactly, Sarka shouted a single word to Dalis. "Now!" The laboratory was swinging about in a sort of circle in a way that made one dizzy if one remained still for the merest second. Sarka, glancing out into the Outside, across which blew the storms of the heights, and noting that no cracks appeared in the surface of the world's vast roof, knew that this swaying motion had been transmitted evenly to all the Earth, and that, so far at least, his calculations had been correct. But Dalis was in a cold sweat of fear, and deathly sick. The motion of the laboratory, like the inside of a whirling top, made him ill, though Sarka could tell that he fought against it with all his great will. Sarka strode to him, looked him in the eyes for a moment. Dalis looked back, glaring defiance. "Are you afraid, Dalis?" he shouted, to be heard above the screaming of the Master Beryl. "I am not afraid," croaked Dalis. "Has the time arrived?" Sarka paused, as though for dramatic effect, and raised his right hand high, while his left hand dropped to the metalized jade lever. There still was room in the slot in the onyx base for the lever to move forward ever so little. * * * * * "We have reached the exact place," cried Sarka, "where the Earth can, by pressure upon this lever, be continued on in its orbit--or forced out of it--out into space! Which shall it be, Dalis? If I move the lever forward we start our voyage, and may not be able to return!" For a moment the nostrils of Dalis quivered as though with fear. His face was white with his illness; but out of his eyes peered the fanatic self-confidence of the man. "Push it forward, O Sarka!" he managed. Sarka, smiling slightly, pushed the lever to its uttermost limit, still with his right arm upraised. For full five minutes he stood thus, and then.... "Now!" he shouted, bringing down his arm. "We have begun our journey into space! Come, let us look Outside, and await the first reports from my father!" The two men, forgetting again for a moment the fact of their enmity, strode to the southern wall of the laboratory and looked out across the roof of the world.