I had seen the gorgeous mundane tabernacle that had housed the equally gorgeous spirit of the real Valla Dia-that I could love; her heart and soul and mind I could love; but I could not love the body of Xaxa. I was torn, too, by other emotions, induced by a great doubt-could Valla Dia return my love. Habilitated in the corpse of Xaxa, with no other suitor, nay, with no other friend she might, out of gratitude or through sheer loneliness, be attracted to me; but once again were she Valla Dia the beautiful and returned to the palace of her king, surrounded by the great nobles of Duhor, would she have either eyes or heart for a lone and friendless exile from another world? I doubted it-and yet that doubt did not deter me from my determination to carry out, as far as Fate would permit, the mad scheme that was revolving in my brain.

"You have not answered my question, Vad Varo," she interrupted my surging thoughts. "Why would you do this thing?"

"To right the wrong that has been done you, Valla Dia," I said.

She sighed. "Do not attempt it, please," she begged. "You would but rob me of my one friend, whose association is the only source of happiness remaining to me. I appreciate your generosity and your loyalty, even though I may not understand them; your unselfish desire to serve me at such suicidal risk touches me more deeply than I can reveal, adding still further to the debt I owe you; but you must not attempt it-you must not."

"If it troubles you, Valla Dia," I replied, "we will not speak of it again; but know always that it is never from my thoughts. Some day I shall find a way, even though the plan I now have fails me."

The days moved on and on, the gorgeous Martian nights, filled with her hurtling moons, followed one upon another. Ras Thavas spent more and more time in directing my work of brain transference. I had long since become an adept; and I realized that the time was rapidly approaching when Ras Thavas would feel that he could safely entrust to my hands and skill his life and future. He would be wholly within my power and he knew that I knew it. I could slay him; I could permit him to remain for ever in the preserving grip of his own anaesthetic; or I could play any trick upon him that I chose, even to giving him the body of a calot or a part of the brain of an ape; but he must take the chance and that I knew, for he was failing rapidly. Already almost stone blind, it was only the wonderful spectacles that he had himself invented that permitted him to see at all; long deaf, he used artificial means for hearing; and now his heart was showing symptoms of fatigue that he could not longer ignore.

One morning I was summoned to his sleeping apartment by a slave. I found the old surgeon lying, a shrunken, pitiful heap of withered skin and bones.

"We must hasten, Vad Varo," he said in a weak whisper. "My heart was like to have stopped a few tals ago. It was then that I sent for you." He pointed to a door leading from his chamber. "There," he said, "you will find the body I have chosen. There, in the private laboratory I long ago built for this very purpose, you will perform the greatest surgical operation that the universe has ever known, transferring its most perfect brain to the most beautiful and perfect body that ever has passed beneath these ancient eyes. You will find the head already prepared to receive my brain; the brain of the subject having been removed and destroyed-totally destroyed by fire. I could not possibly chance the existence of a brain desiring and scheming to regain its wondrous body. No, I destroyed it. Call slaves and have them bear my body to the ersite slab."

"That will not be necessary," I told him; and lifting his shrunken form in my arms as he had been an Earthly babe, I carried him into the adjoining room where I found a perfectly lighted and appointed laboratory containing two operating tables, one of which was occupied by the body of a red-man. Upon the surface of the other, which was vacant, I laid Ras Thavas, then I turned to look at the new envelope he had chosen. Never, I believe, had I beheld so perfect a form, so handsome a face-Ras Thavas had indeed chosen well for himself. Then I turned back to the old surgeon. Deftly, as he had taught me, I made the two incisions and attached the tubes. My finger rested upon the button that would start the motor pumping his blood from his veins and his marvellous preservative-anaesthetic into them. Then I spoke.

"Ras Thavas," I said, "you have long been training me to this end. I have labored assiduously to prepare myself that there might be no slightest cause for apprehension as to the outcome. You have, coincidentally, taught me that one's every act should be prompted by self-interest only.