Suffice it to say that at the end of four hours he had transferred the brain of each woman to the brain pan of the other, deftly connected the severed nerves and ganglia, replaced the skulls and scalps and bound both heads securely with his peculiar adhesive tape, which was not only antiseptic and healing but anaesthetic, locally, as well.

He now reheated the blood that he had withdrawn from the body of the old woman, adding a few drops of some clear chemical solution, withdrew the liquid from the veins of the beautiful corpse, replacing it with the blood of the old woman and simultaneously administering a hypodermic injection.

During the entire operation he had not spoken a word. Now he issued a few instructions in his curt manner to his assistants, motioned me to follow him, and left the room. He led me to a distant part of the building or series of buildings that composed the whole, ushered me into a luxurious apartment, opened the door to a Barsoomian bath and left me in the hands of trained servants.

Refreshed and rested I left the bath after an hour of relaxation to find harness and trappings awaiting me in the adjoining chamber. Though plain, they were of good material, but there were no weapons with them.

Naturally I had been thinking much upon the strange things I had witnessed since my advent upon Mars, but what puzzled me most lay in the seemingly inexplicable act of the old woman in paying my host what was evidently a considerable sum to murder her and transfer to the inside of her skull the brain of a corpse. Was it the outcome of some horrible religious fanaticism, or was there an explanation that my Earthly mind could not grasp?

I had reached no decision in the matter when I was summoned to follow a slave to another and near-by apartment where I found my host awaiting me before a table loaded with delicious foods, to which, it is needless to say, I did ample justice after my long fast and longer weeks of rough army fare.

During the meal my host attempted to converse with me, but, naturally, the effort was fruitless of results. He waxed quite excited at times and upon three distinct occasions laid his hand upon one of his swords when I failed to comprehend what he was saying to me, an action which resulted in a growing conviction upon my part that he was partially demented; but he evinced sufficient self-control in each instance to avert a catastrophe for one of us.

The meal over he sat for a long time in deep meditation, then a sudden resolution seemed to possess him. He turned suddenly upon me with a faint suggestion of a smile and dove headlong into what was to prove an intensive course of instruction in the Barsoomian language. It was long after dark before he permitted me to retire for the night, conducting me himself to a large apartment, the same in which I had found my new harness, where he pointed out a pile of rich sleeping silks and furs, bid me a Barsoomian good night and left me, locking the door after him upon the outside, and leaving me to guess whether I were more guest or prisoner.

Three weeks passed rapidly. I had mastered enough of the Barsoomian tongue to enable me to converse with my host in a reasonably satisfactory manner, and I was also progressing slowly in the mastery of the written language of his nation, which is different, of course, from the written language of all other Barsoomian nations, though the spoken language of all is identical. In these three weeks I had learned much of the strange place in which I was half guest and half prisoner and of my remarkable host-jailer, Ras Thavas, the old surgeon of Toonol, whom I had accompanied almost constantly day after day until gradually there had unfolded before my astounded faculties an understanding of the purposes of the institution over which he ruled and in which he laboured practically alone; for the slaves and attendants that served him were but hewers of wood and carriers of water. It was his brain alone and his skill that directed the sometimes beneficent, the sometimes malevolent, but always marvellous activities of his life's work.

Ras Thavas himself was as remarkable as the things he accomplished. He was never intentionally cruel; he was not, I am sure, intentionally wicked. He was guilty of the most diabolical cruelties and the basest of crimes; yet in the next moment he might perform a deed that if duplicated upon Earth would have raised him to the highest pinnacle of man's esteem. Though I know that I am safe in saying that he was never prompted to a cruel or criminal act by base motives, neither was he ever urged to a humanitarian one by high motives. He had a purely scientific mind entirely devoid of the cloying influences of sentiment, of which he possessed none. His was a practical mind, as evidenced by the enormous fees he demanded for his professional services; yet I know that he would not operate for money alone and I have seen him devote days to the study of a scientific problem the solution of which could add nothing to his wealth, while the quarters that he furnished his waiting clients were overflowing with wealthy patrons waiting to pour money into his coffers.

His treatment of me was based entirely upon scientific requirements. I offered a problem. I was either, quite evidently, not a Barsoomian at all, or I was of a species of which he had no knowledge. It therefore best suited the purposes of science that I be preserved and studied. I knew much about my own planet. It pleased Ras Thavas' scientific mind to milk me of all I knew in the hope that he might derive some suggestion that would solve one of the Barsoomian scientific riddles that still baffle their savants; but he was compelled to admit that in this respect I was a total loss, not alone because I was densely ignorant upon practically all scientific subjects, but because the learned sciences on Earth have not advanced even to the swaddling-clothes stage as compared with the remarkable progress of corresponding activities on Mars. Yet he kept me by him, training me in many of the minor duties of his vast laboratory. I was entrusted with the formula of the "embalming fluid" and taught how to withdraw a subject's blood and replace it with this marvellous preservative that arrests decay without altering in the minutest detail the nerve or tissue structure of the body. I learned also the secret of the few drops of solution which, added to the rewarmed blood before it is returned to the veins of the subject revitalizes the latter and restores to normal and healthy activity each and every organ of the body.

He told me once why he had permitted me to learn these things that he had kept a secret from all others, and why he kept me with him at all times in preference to any of the numerous individuals of his own race that served him and me in lesser capacities both day and night.

"Vad Varo," he said, using the Barsoomian name that he had given me because he insisted that my own name was meaningless and impractical, "for many years I have needed an assistant, but heretofore I have never felt that I had discovered one who might work here for me wholeheartedly and disinterestedly without ever having reason to go elsewhere or to divulge my secrets to others. You, in all Barsoom, are unique-you have no other friend or acquaintance than myself. Were you to leave we you would find yourself in a world of enemies, for all are suspicious of a stranger. You would not survive a dozen dawns and you would be cold and hungry and miserable-a wretched outcast in a hostile world. Here you have every luxury that the mind of man can devise or the hand of man produce, and you are occupied with work of such engrossing interest that your every hour must be fruitful of unparalleled satisfaction. There is no selfish reason, therefore, why you should leave me and there is every reason why you should remain. I expect no loyalty other than that which may be prompted by egoism. You make an ideal assistant, not only for the reasons I have just given you, but because you are intelligent and quick-witted, and now I have decided, after observing you carefully for a sufficient time, that you can serve me in yet another capacity-that of personal bodyguard.