«How do you do it?» asked Tara of Helium. «I do not understand it at all.»

«I will show you,» he said, and lay down upon the floor. Then he detached himself from the body, which lay as a thing dead. On his spider legs he walked toward the girl. «Now look,» he admonished her. «Do you see this thing?» and he extended what appeared to be a bundle of tentacles from the posterior part of his head. «There is an aperture just back of the rykor's mouth and directly over the upper end of his spinal column. Into this aperture I insert my tentacles and seize the spinal cord. Immediately I control every muscle of the rykor's body-it becomes my own, just as you direct the movement of the muscles of your body. I feel what the rykor would feel if he had a head and brain. If he is hurt, I would suffer if I remained connected with him; but the instant one of them is injured or becomes sick we desert it for another. As we would suffer the pains of their physical injuries, similarly do we enjoy the physical pleasures of the rykors. When your body becomes fatigued you are comparatively useless; it is sick, you are sick; if it is killed, you die. You are the slave of a mass of stupid flesh and bone and blood. There is nothing more wonderful about your carcass than there is about the carcass of a banth. It is only your brain that makes you superior to the banth, but your brain is bound by the limitations of your body. Not so, ours. With us brain is everything. Ninety per centum of our volume is brain. We have only the simplest of vital organs and they are very small for they do not have to assist in the support of a complicated system of nerves, muscles, flesh and bone. We have no lungs, for we do not require air. Far below the levels to which we can take the rykors is a vast network of burrows where the real life of the kaldane is lived. There the air-breathing rykor would perish as you would perish. There we have stored vast quantities of food in hermetically sealed chambers. It will last forever. Far beneath the surface is water that will flow for countless ages after the surface water is exhausted. We are preparing for the time we know must come-the time when the last vestige of the Barsoomian atmosphere is spent-when the waters and the food are gone. For this purpose were we created, that there might not perish from the planet Nature's divinest creation-the perfect brain.»

«But what purpose can you serve when that time comes?» asked the girl.

«You do not understand,» he said. «It is too big for you to grasp, but I will try to explain it. Barsoom, the moons, the sun, the stars, were created for a single purpose. From the beginning of time Nature has labored arduously toward the consummation of this purpose. At the very beginning things existed with life, but with no brain. Gradually rudimentary nervous systems and minute brains evolved. Evolution proceeded. The brains became larger and more powerful. In us you see the highest development; but there are those of us who believe that there is yet another step-that some time in the far future our race shall develop into the super-thing-just brain. The incubus of legs and chelae and vital organs will be removed. The future kaldane will be nothing but a great brain. Deaf, dumb, and blind it will lie sealed in its buried vault far beneath the surface of Barsoom-just a great, wonderful, beautiful brain with nothing to distract it from eternal thought.»

«You mean it will just lie there and think?» cried Tara of Helium.

«Just that!» he exclaimed. «Could aught be more wonderful?»

«Yes,» replied the girl, «I can think of a number of things that would be infinitely more wonderful.»

What the creature had told her gave Tara of Helium food for thought. She had been taught that every created thing fulfilled some useful purpose, and she tried conscientiously to discover just what was the rightful place of the kaldane in the universal scheme of things. She knew that it must have its place but what that place was it was beyond her to conceive. She had to give it up. They recalled to her mind a little group of people in Helium who had forsworn the pleasures of life in the pursuit of knowledge. They were rather patronizing in their relations with those whom they thought not so intellectual. They considered themselves quite superior. She smiled at recollection of a remark her father had once made concerning them, to the effect that if one of them ever dropped his egotism and broke it it would take a week to fumigate Helium. Her father liked normal people-people who knew too little and people who knew too much were equally a bore. Tara of Helium was like her father in this respect and like him, too, she was both sane and normal.

Outside of her personal danger there was much in this strange world that interested her. The rykors aroused her keenest pity, and vast conjecture. How and from what form had they evolved? She asked Ghek.

«Sing to me again and I will tell you,» he said. «If Luud would let me have you, you should never die. I should keep you always to sing to me.»

The girl marvelled at the effect her voice had upon the creature. Somewhere in that enormous brain there was a chord that was touched by melody. It was the sole link between herself and the brain when detached from the rykor. When it dominated the rykor it might have other human instincts; but these she dreaded even to think of. After she had sung she waited for Ghek to speak. For a long time he was silent, just looking at her through those awful eyes.

«I wonder,» he said presently, «if it might not be pleasant to be of your race. Do you all sing?»

«Nearly all, a little,» she said; «but we do many other interesting and enjoyable things. We dance and play and work and love and sometimes we fight, for we are a race of warriors.»

«Love!» said the kaldane. «I think I know what you mean; but we, fortunately, are above sentiment-when we are detached. But when we dominate the rykor-ah, that is different, and when I hear you sing and look at your beautiful body I know what you mean by love. I could love you.»

The girl shrank from him. «You promised to tell me the origin of the rykor,» she reminded him.

«Ages ago,» he commenced, «our bodies were larger and our heads smaller. Our legs were very weak and we could not travel fast or far. There was a stupid creature that went upon four legs. It lived in a hole in the ground, to which it brought its food, so we ran our burrows into this hole and ate the food it brought; but it did not bring enough for all-for itself and all the kaldanes that lived upon it, so we had also to go abroad and get food. This was hard work for our weak legs. Then it was that we commenced to ride upon the backs of these primitive rykors. It took many ages, undoubtedly, but at last came the time when the kaldane had found means to guide the rykor, until presently the latter depended entirely upon the superior brain of his master to guide him to food. The brain of the rykor grew smaller as time went on. His ears went and his eyes, for he no longer had use for them-the kaldane saw and heard for him. By similar steps the rykor came to go upon its hind feet that the kaldane might be able to see farther. As the brain shrank, so did the head. The mouth was the only feature of the head that was used and so the mouth alone remains. Members of the red race fell into the hands of our ancestors from time to time. They saw the beauties and the advantages of the form that nature had given the red race over that which the rykor was developing into. By intelligent crossing the present rykor was achieved. He is really solely the product of the super-intelligence of the kaldane-he is our body, to do with as we see fit, just as you do what you see fit with your body, only we have the advantage of possessing an unlimited supply of bodies. Do you not wish that you were a kaldane?»