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.