A blanket of cold had fallen upon all the earth. In many sections there had been torrential rains as the clouds condensed, and there was considerable loss of life due to flood. In certain sections there had been terrible blizzards, and thousands had been frozen to death. Vast damage had been done to young crops, and there was a threat of famine. But, in most places, enough radiation to cause freezing weather had been prevented by the dense clouds. Varied and fantastic theories were advanced as to the cause of the unique phenomenon. The most popular explanation was that the solar system had passed through a small, dense nebula, the particles and condensing gases of which had intercepted solar radiation. Sam's brief statement, advanced a few days later, that he had found the disturbance to be due to a strange force acting to erect an etheric screen or shell about the earth, through which vibration could not pass, received scant attention despite his scientific reputation; and his warning that it might return again at any time, and forever, passed unheeded. He made no mention of what he had done to save the earth. CHAPTER VI The Omnimobile I now come to the Omnimobile, the machine that Sam had designed with a view to use in interplanetary navigation. He had worked on it, of course, more to please me than for any other reason; and we both knew that there was little chance of the machine's being able to make a successful voyage through space. On the day after the sun had been restored, Sam was back in his laboratory, still feeling out the strange forces in the ether, and trying to anticipate the next attack. I was wandering along the beach, rejoicing in the bright warmth of the sun, absorbing the spell of the wood and the sea and the fresh salty air, regretting that all of it might be frozen again. There an idea came abruptly to me. Why not build the Omnimobile? Designed to withstand the bitter cold and the absolute vacuum of space, planned to survive the shock of landing on frozen worlds, equipped to traverse the terrible mountains of the moon, to crawl over the burned deserts of Mars, or to explore the vast seas of Venus--even if it would not be able actually to leave the earth, might it not preserve our lives when the frozen night came again? A bitter existence it might seem, to spend one's years shut up in a metal cylinder, in a dark and frozen world, traveling, perhaps, in absolute night, over still, unseen cities of the dead. But I had my books--and the Green Girl! I could live on with that wonderful princess of my dreams, and forget the doom of my kind! It seemed selfish to think of it--but my love of the Green Girl was so great that I would have given my all for her, even to dream of her!