Are my premises incorrect, or my reasoning faulty?"

I assured him to the contrary.

"Very well! Now let me explain why I have gone to such pains to train you as no other human being, aside from myself, has ever been trained. I am not ready to use you yet, or rather you are not ready; but if you know my purpose you will realize the necessity for bending your energy to the consummation of my purpose, and to that end you will strive even more diligently than you have to perfect yourself in the high, scientific art I am imparting to you.

"I am a very old man," he continued after a brief pause, "even as age goes upon Barsoom. I have lived more than a thousand years. I have passed the allotted natural span of life, but I am not through with my life's work-I have but barely started it. I must not die. Barsoom must not be robbed of this wondrous brain and skill of mine. I have long had in mind a plan to thwart death, but it required another with skill equal to mine-two such might live for ever. I have selected you to be that other, for reasons that I already have explained-they are undefiled by sentimentalism. I did not choose you because I love you, or because I feel friendship for you, or because I think that you love me, or feel friendship towards me. I chose you because I knew that of all the inhabitants of a world you were the one least likely to fail me. For a time you will have my life in your hands. You will understand now why I have not been able to choose carelessly.

"This plan that I have chosen is simplicity itself provided that I can count upon just two essential factors-skill and self-interested loyalty in an assistant. My body is about worn out. I must have a new one. My laboratory is filled with wonderful bodies, young and complete with potential strength and health. I have but to select one of these and have my skilled assistant transfer my brain from this old carcass to the new one." He paused.

"I understand now, why you have trained me," I said. "It has puzzled me greatly."

"Thus and thus only may I continue my labors," he went on, "and thus may Barsoom be assured a continuance practically indefinitely, of the benefits that my brain may bestow upon her children. I may live for ever, provided I always have a skilled assistant, and I may assure myself of such by seeing to it that he never dies; when he wears out one organ, or his whole body, I can replace either from my great storehouse of perfect parts, and for me he can perform the same service. Thus may we continue to live indefinitely; for the brain, I believe, is almost deathless, unless injured or attacked by disease.

"You are not ready as yet to be entrusted with this important task. You must transfer many more brains and meet with and overcome the various irregularities and idiosyncrasies that constitute the never failing differences that render no two operations identical. When you gain sufficient proficiency I shall be the first to know it and then we shall lose no time in making Barsoom safe for posterity."

The old man was far from achieving hatred of himself. However, his plan was an excellent one, both for himself and for me. It assured us immortality-we might live for ever and always with strong, healthy, young bodies. The outlook was alluring-and what a wonderful position it placed me in. If the old man could be assured of my loyalty because of self-interest, similarly might I depend upon his loyalty; for he could not afford to antagonize the one creature in the world who could assure him immortality, or withhold it from him. For the first time since I had entered his establishment I felt safe.

As soon as I had left him I went directly to Valla Dia's apartment, for I wanted to tell her his wonderful news. In the weeks that had passed since her resurrection I had seen much of her and in our daily intercourse there had been revealed to me little by little the wondrous beauties of her soul, until at last I no longer saw the hideous, disfigured face of Xaxa when I looked upon her, but the eyes of my heart penetrated deeper to the loveliness that lay within that sweet mind. She had become my confidante, as I was hers, and this association constituted the one great pleasure of my existence upon Barsoom.

Her congratulations, when I told her of what had come to me, were very sincere and lovely. She said that she hoped I would use this great power of mine to do good in the world. I assured her that I would and that among the first things that I should demand of Ras Thavas was that he should give Valla Dia a beautiful body; but she shook her head.

"No, my friend," she said, "if I may not have my own body this old one of Xaxa's is quite as good for me as another.