For a time Underwood nursed the hope that these structural differences might make it impossible for Demarzule to survive on Earth. But the further the lungs developed, the more evident it became that the Sirenian would adapt to the atmosphere. As to food, there was little doubt that nourishment would be no problem. By the sixth month, too, it was hopeless to assume that anything would go wrong with the process of restoration. Toshmere had planned too well. Underwood wondered what had become of Phyfe and Dreyer, if they had been captured and killed, or if they still lived in the depths of the ancient buildings beneath the city. There had been absolutely no word. He had been kept in complete isolation since their tragic failure. He spoke to no one except the silent guards and his fellow technicians. He knew of none that he could trust, for he was certain that among the scientists working beside him, there were those whose duty it was to spy upon him. Craven, for example, had become more sullen day by day, and now he avoided Underwood almost continually, as if ashamed of the things that he believed in and had done, but unable to renounce them or help himself. The symptoms of hysteria were becoming constantly more evident. Underwood looked for them in the other scientists, but he was not skilled enough to detect all the signs. The only way was to play safe and take no one into his confidence. * * * * * Life went on timelessly in the nightmare world. The light of day was completely obscured by the force shell. As Underwood strolled out of the museum building and looked up at its blackness, he recalled how it had saved the world centuries ago, when mankind had once before been on the verge of self-destruction in the dim beginnings of the atomic age. Only by the discovery of the force shell, a field impenetrable by any substance or radiation or force, had men been saved from total annihilation. But now man was faced by another potent force of destruction--his own desire to submit to any leader who promised relief from independent responsibility and action. The alien would certainly be able to fulfill that promise where no man could, but was it worth the risk of being saddled with a bloody dictatorship? It was fantastic, Underwood thought, that he could find no way to elude his guards and kill the growing monster. Variations in the strength of the radiation might do it, but there was no possibility of varying the radiation. The guards, whose leaders were technically trained, had access to the records of the scientists, which not only gave the details of previous work, but outlined each step until Demarzule was restored. Underwood dared not attempt departures of procedure from the written notes. The bath itself had been surrounded by a transparent guard impervious to solid shot or radiation weapons--even if he could have obtained any--nor could poisons be placed in the nutrient solution.