Millions of ages had rolled away since the struggle began--the battle of life on earth against the encroachments of death. And now death stalked everywhere, grinning with malicious triumph, for he had but one more battle to fight. Already his grisly clutch was closing on the standard of victory. Man had mastered life but he had not conquered death. With the magic wand of science he had reached out into space and viewed the life of far-off worlds. He had routed superstition and fear and selfishness. He had banished disease and learned all nature's secrets; had even visited other worlds and had come to know and understand his God, but still death had marched grimly on. For even the abysmal moment of creation had marked the world for his prey. Slowly but surely death had closed his cold hands about the earth. The sun flung forth his hot rays and drew more and more of the earth's moisture and dissipated it in space. Gradually the forests vanished and then the streams and lakes dwindled and disappeared. By this time the atmosphere had thinned almost imperceptibly--and only by the aid of his scientific instruments had man been able to detect its thinning. Less and less rain fell, and finally even the ice-caps about the poles trickled away. Cold and gaunt and shadowy those regions lay silent and lifeless throughout the long nights, and loomed like gray ghosts in the hushed light of the summer. The sun blazed on relentlessly and the shores of the seven seas receded age after age, but with his science and his machines man had doggedly followed the retreating waters, husbanded and harnessed them and thus retained his grip on life. But now at last life on earth had come to its final battlefield. The plans of the battle were sharply drawn, but there could be no doubt of the issue. No one knew this better than Omega, for the sun shone on with undiminished power. Yet the rotation of the earth had slackened until twenty-five hours constituted a day, while the year was 379 days and a fraction in length. Man, gradually adjusting himself to the new conditions and environment, had triumphed even in the face of a losing fight. For he had learned to smile into the hollow sockets of death, to laugh at the empty promises of life. * * * * * Back in their ship Omega and Thalma gazed out over the dead world, where the salt crystals gleamed and sparkled in the sunshine. "Will all this ever become green again and full of joy and life?" asked Thalma wearily. "Why not?" asked Omega. "Although the race has come to its last stand, water is here and before it is gone who knows what may happen?" Omega spoke only to please his wife, for well he knew in his heart that the star of hope had forever set. And always he was thinking of that commotion in the waters of the lake. What could have caused it? What did it portend? He was sure that the answer was to be one of tragedy.