More than that, he took up the story of his adventures where he had left off in the previous instance, admitted freely that he had reversed the experiment by which he had gained material existence on Palos, and, driven by the necessity of gaining knowledge for use in his new estate, had deliberately returned to earth. Unbelievable, you will say again. And again I answer: "Yes--but wait." Croft was a physician, even as am I. He was a scientific man. In addition he was a student of the occult--the science of the mind, the spirit, and its control of the physical forces of life. He was an earth-born man. The home in which I first met him contained the greatest private collection of works on the subject I have ever seen. In dying he left them to me--I have them all about me. They are mine. According to his statements and his notations on margins, he had gone so far in his investigations that he could project the astral consciousness anywhere at will. And when I say anywhere, I mean it in the literal sense. Many men have mastered the astral control on the earthly plane. Croft had carried it to an ultimate degree. He shook off the envelope of the earth atmosphere, led thereto, as he frankly confessed in our conversations, by the attraction of a feminine spirit, though he did not know it at the time, and recognized it only when he first viewed Naia--Princess of Tamarizia--on a distant star. I had dabbled in the occult to some extent myself. Hence when he spoke of the doctrine of twin souls he had no further need to explain. He alleged that since a child the Dog Star had called him subtly through the years in a way he could not explain. Once having come into her presence, however, he knew that it was Naia--the feminine counterpart of his nature--whose existence on the other planet had called across the void to him. Or so he claimed. And certainly his portrayal of the events on Palos were characterized by a detail that made the atmosphere of his alleged other existence most vividly plain. To an accomplishment of his marrying her, Croft declared that he had done a weirdly wonderful thing. Discovering a Palosian dying of a mental rather than a physical ailment, he had waited until his death occurred, then appropriated the still physically viable body to himself, as he most comprehensively explained, describing his act in a scientific way that counseled belief while staggering the mind. Over that body he obtained absolute control, exactly as he had gained the same ability with his own. For a time thereafter he led a sort of dual existence, sometimes on Palos, sometimes on earth, until he had fully shaped his plans. Then, and then only, did he voluntarily forsake the mundane life to enter that other and fuller existence he felt that Naia of Aphur could make complete. * * * * *