He realized he was almost exhausted. The tremendous drain of his efforts on his energy told on him at last. He no longer had the strength to try any more, and Nuwell and Maya were gone away from him into the Martian sky. Wearily, he turned back and went through the airlock, down the corridor and down the stairs. There was nothing more he could do now. Nuwell undoubtedly would take Maya to Mars City. And then? Maya would refuse to marry Nuwell now, and Dark doubted that Nuwell could force her. What Nuwell would do with her, he did not know. Probably some sort of confinement, eventually perhaps a trial. But Nuwell had no ground or reason to do her any real harm. He would have to try to get to Maya as soon as he could, and that meant intensification of his efforts. But there was only one course he could hope to follow successfully, and that was the course he had planned when he started out for Ultra Vires. Only now he _could_ speed it up. He had to have some rest. Then he would pick up three marsuits and walk back across the desert to the Canfell Hydroponic Farm. 15 Dark walked across the desert toward the Canfell Hydroponic Farm. He had discarded the marsuit he had been wearing, and substituted for it a light loincloth torn from one of Goat Hennessey's sheets. This reverse reaction, in a temperature that would be uncomfortably chilly for a fully clothed man and descended far below zero at night, resulted from his recognition that he gained a tremendously greater direct influx of energy from the total exposure of his skin to the sunlight. He could feel the energy penetrating his flesh, building up in him. And, with this energy, the low temperature did not bother him. Behind him, by a rope, he dragged a little two-wheeled cart he had constructed from groundcar parts. It rolled and bumped over the sandy terrain, containing all the marsuits and all the seven heatguns that he had been able to find at Ultra Vires. It also contained a supply of water, in cans. Dark had found that, while he was operating directly on solar energy, he did not need food at all and he did not need as much water as he did under ordinary circumstances. He probably could have survived two weeks without any water at all. But some water did make him much more efficient. His independence of food and oxygen did not prevent the slow dessication if his tissues in the dry Martian air. As he walked, only part of his mind was devoted to the routine task of moving across the desert. The remainder of it was free of the limitation of distance, touching and interacting with the minds of three other men. These men were members of the Phoenix. At the Childress Barber College, they had been among the instructors, struggling to develop the ESP potentialities of their students so that a psychic community of purpose and action might be developed toward the goal of teleporting materials from Earth to Mars.