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of concrete, at the further end of which was another door, similar in every respect to the one I had just passed. No one was in sight, yet immediately we passed the first door it slid gently into place behind us and receded rapidly to its original position in the front wall of the building. As the door had slipped aside I had noted its great thickness, fully twenty feet, and as it reached its place once more after closing behind us, great cylinders of steel had dropped from the ceiling behind it and fitted their lower ends into apertures countersunk in the floor.

A second and third door receded before me and slipped to one side as the first, before I reached a large inner chamber where I found food and drink set out upon a great stone table. A voice directed me to satisfy my hunger and to feed my calot, and while I was thus engaged my invisible host put me through a severe and searching cross-examination.

“Your statements are most remarkable,” said the voice, on concluding its questioning, “but you are evidently speaking the truth, and it is equally evident that you are not of Barsoom. I can tell that by the conformation of your brain and the strange location of your internal organs and the shape and size of your heart.”

“Can you see through me?” I exclaimed.

“Yes, I can see all but your thoughts, and were you a Barsoomian I could read those.”

Then a door opened at the far side of the chamber and a strange, dried up, little mummy of a man came toward me. He wore but a single article of clothing or adornment, a small collar of gold from which depended upon his chest a great ornament as large as a dinner plate set solid with huge diamonds, except for the exact center which was occupied by a strange stone, an inch in diameter, that scintillated nine different and distinct rays; the seven colors of our earthly prism and two beautiful rays which, to me, were new and nameless. I cannot describe them any more than you could describe red to a blind man. I only know that they were beautiful in the extreme.

The old man sat and talked with me for hours, and the strangest part of our intercourse was that I could read his every thought while he could not fathom an iota from my mind unless I spoke.

I did not apprise him of my ability to sense his mental operations, and thus I learned a great deal which proved of immense value to me later and which I would never have known had he suspected my strange power, for the Martians have such perfect control of their mental machinery that they are able to direct their thoughts with absolute precision.

The building in which I found myself contained the machinery which produces that artificial atmosphere which sustains life on Mars. The secret of the entire process hinges on the use of the ninth ray, one of the beautiful scintillations which I had noted emanating from the great stone in my host’s diadem.

This ray is separated from the other rays of the sun by means of finely adjusted instruments placed upon the roof of the huge building, three-quarters of which is used for reservoirs in which the ninth ray is stored. This product is then treated electrically, or rather certain proportions of refined electric vibrations are incorporated with it, and the result is then pumped to the five principal air centers of the planet where, as it is released, contact with the ether of space transforms it into atmosphere.

There is always sufficient reserve of the ninth ray stored in the great building to maintain the present Martian atmosphere for a thousand years, and the only fear, as my new friend told me, was that some accident might befall the pumping apparatus.

He led me to an inner chamber where I beheld a battery of twenty radium pumps any one of which was equal to the task of furnishing all Mars with the atmosphere compound. For eight hundred years, he told me, he had watched these pumps which are used alternately a day each at a stretch, or a little over twenty-four and one-half Earth hours. He has one assistant who divides the watch with him. Half a Martian year, about three hundred and forty-four of our days, each of these men spend alone in this huge, isolated plant.

Every red Martian is taught during earliest childhood the principles of the manufacture of atmosphere, but only two at one time ever hold the secret of ingress to the great building, which, built as it is with walls a hundred and fifty feet thick, is absolutely unassailable, even the roof being guarded from assault by air craft by a glass covering five feet thick.

The only fear they entertain of attack is from the green Martians or some demented red man, as all Barsoomians realize that the very existence of every form of life of Mars is dependent upon the uninterrupted working of this plant.

One curious fact I discovered as I watched his thoughts was that the outer doors are manipulated by telepathic means. The locks are so finely adjusted that the doors are released by the action of a certain combination of thought waves. To experiment with my newfound toy I thought to surprise him into revealing this combination and so I asked him in a casual manner how he had managed to unlock the massive doors for me from the inner chambers of the building. As quick as a flash there leaped to his mind nine Martian sounds, but as quickly faded as he answered that this was a secret he must not divulge.

From then on his manner toward me changed as though he feared that he had been surprised into divulging his great secret, and I read suspicion and fear in his looks and thoughts, though his words were still fair.

Before I retired for the

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