He rubbed his cheek against mine in a final caress, and a moment later was speeding through the Carrion Caves toward the outer world.

In my note to Carthoris I had given explicit directions for locating the Carrion Caves, impressing upon him the necessity for making entrance to the country beyond through this avenue, and not to attempt under any circumstances to cross the ice-barrier with a fleet. I told him that what lay beyond the eighth cave I could not even guess; but I was sure that somewhere upon the other side of the ice-barrier his mother lay in the power of Matai Shang, and that possibly his grandfather and great-grandfather as well, if they lived.

Further, I advised him to call upon Kulan Tith and the son of Thuvan Dihn for warriors and ships that the expedition might be sufficiently strong to insure success at the first blow.

"And," I concluded, "if there be time bring Tars Tarkas with you, for if I live until you reach me I can think of few greater pleasures than to fight once more, shoulder to shoulder, with my old friend."

When Woola had left us Thuvan Dihn and I, hiding in the seventh cave, discussed and discarded many plans for crossing the eighth chamber. From where we stood we saw that the fighting among the apts was growing less, and that many that had been feeding had ceased and lain down to sleep.

Presently it became apparent that in a short time all the ferocious monsters might be peacefully slumbering, and thus a hazardous opportunity be presented to us to cross through their lair.

One by one the remaining brutes stretched themselves upon the bubbling decomposition that covered the mass of bones upon the floor of their den, until but a single apt remained awake. This huge fellow roamed restlessly about, nosing among his companion and the abhorrent litter of the cave.

Occasionally he would stop to peer intently toward first one of the exits from the chamber and then the other. His whole demeanor was as of one who acts as sentry.

We were at last forced to the belief that he would not sleep while the other occupants of the lair slept, and so cast about in our minds for some scheme whereby we might trick him. Finally I suggested a plan to Thuvan Dihn, and as it seemed as good as any that we had discussed we decided to put it to the test.

To this end Thuvan Dihn placed himself close against the cave's wall, beside the entrance to the eighth chamber, while I deliberately showed myself to the guardian apt as he looked toward our retreat. Then I sprang to the opposite side of the entrance, flattening my body close to the wall.

Without a sound the great beast moved rapidly toward the seventh cave to see what manner of intruder had thus rashly penetrated so far within the precincts of his habitation.

As he poked his head through the narrow aperture that connects the two caves a heavy long-sword was awaiting him upon either hand, and before he had an opportunity to emit even a single growl his severed head rolled at our feet.

Quickly we glanced into the eighth chamber—not an apt had moved. Crawling over the carcass of the huge beast that blocked the doorway Thuvan Dihn and I cautiously entered the forbidding and dangerous den.

Like snails we wound our silent and careful way among the huge, recumbent forms. The only sound above our breathing was the sucking noise of our feet as we lifted them from the ooze of decaying flesh through which we crept.

Halfway across the chamber and one of the mighty beasts directly before me moved restlessly at the very instant that my foot was poised above his head, over which I must step.

Breathlessly I waited, balancing upon one foot, for I did not dare move a muscle. In my right hand was my keen short-sword, the point hovering an inch above the thick fur beneath which beat the savage heart.

Finally the apt relaxed, sighing, as with the passing of a bad dream, and resumed the regular respiration of deep slumber. I planted my raised foot beyond the fierce head and an instant later had stepped over the beast.

Thuvan Dihn followed directly after me, and another moment found us at the further door, undetected.

The Carrion Caves consist of a series of twenty-seven connecting chambers, and present the appearance of having been eroded by running water in some far-gone age when a mighty river found its way to the south through this single breach in the barrier of rock and ice that hems the country of the pole.

Thuvan Dihn and I traversed the remaining nineteen caverns without adventure or mishap.

We were afterward to learn that but once a month is it possible to find all the apts of the Carrion Caves in a single chamber.

At other times they roam singly or in pairs in and out of the caves, so that it would have been practically impossible for two men to have passed through the entire twenty-seven chambers without encountering an apt in nearly every one of them. Once a month they sleep for a full day, and it was our good fortune to stumble by accident upon one of these occasions.

Beyond the last cave we emerged into a desolate country of snow and ice, but found a well-marked trail leading north. The way was boulder-strewn, as had been that south of the barrier, so that we could see but a short distance ahead of us at any time.

After a couple of hours we passed round a huge boulder to come to a steep declivity leading down into a valley.

Directly before us we saw a half dozen men—fierce, black-bearded fellows, with skins the color of a ripe lemon.

"The yellow men of Barsoom!" ejaculated Thuvan Dihn, as though even now that he saw them he found it scarce possible to believe that the very race we expected to find hidden in this remote and inaccessible land did really exist.

We withdrew behind an adjacent boulder to watch the actions of the little party, which stood huddled at the foot of another huge rock, their backs toward us.

One of them was peering round the edge of the granite mass as though watching one who approached from the opposite side.

Presently the object of his scrutiny came within the range of my vision and I saw that it was another yellow man. All were clothed in magnificent furs—the six in the black and yellow striped hide of the orluk, while he who approached alone was resplendent in the pure white skin of an apt.

The yellow men were armed with two swords, and a short javelin was slung across the back of each, while from their left arms hung cuplike shields no larger than a dinner plate, the concave sides of which turned outward toward an antagonist.

They seemed puny and futile implements of safety against an even ordinary swordsman, but I was later to see the purpose of them and with what wondrous dexterity the yellow men manipulate them.

One of the swords which each of the warriors carried caught my immediate attention. I call it a sword, but really it was a sharp-edged blade with a complete hook at the far end.

The other sword was of about the same length as the hooked instrument, and somewhere between that of my long-sword and my short-sword. It was straight and two-edged. In addition to the weapons I have enumerated each man carried a dagger in his harness.

As the white-furred one approached, the six grasped their swords more firmly—the hooked instrument in the left hand, the straight sword in the right, while above the left wrist the small shield was held rigid upon a metal bracelet.

As the lone warrior came opposite them the six rushed out upon him with fiendish yells that resembled nothing more closely than the savage war cry of the Apaches of the South-west.

Instantly the attacked drew both his swords, and as the six fell upon him I witnessed as pretty fighting as one might care to see.

With their sharp hooks the combatants attempted to take hold of an adversary, but like lightning the cupshaped shield would spring before the darting weapon and into its hollow the hook would plunge.

Once the lone warrior caught an antagonist in the side with his hook, and drawing him close ran his sword through him.

But the odds were too unequal, and, though he who fought alone was by far the best and bravest of them all, I saw that it was but a question of time before the remaining five would find an opening through his marvelous guard and bring him down.

Now my sympathies have ever been with the weaker side of an argument, and though I knew nothing of the cause of the trouble I could not stand idly by and see a brave man butchered by superior numbers.

As a matter of fact I presume I gave little attention to seeking an excuse, for I love a good fight too well to need any other reason for joining in when one is afoot.

So it was that before Thuvan Dihn knew what I was about he saw me standing by the side of the white-clad yellow man, battling like mad with his five adversaries.

With the Yellow Men

*

Thuvan Dihn was not long in joining me; and, though we found the hooked weapon a strange and savage thing with which to deal, the three of us soon despatched the five black-bearded warriors who opposed us.

When the battle was over our new acquaintance turned to me, and removing the shield from his wrist, held it out. I did not know the significance of his act, but judged that it was but a form of expressing his gratitude to me.

I afterward learned that it symbolized the offering of a man's life in return for some great favor done him; and my act of refusing, which I had immediately done, was what was expected of me.

"Then accept from Talu, Prince of Marentina," said the yellow man, "this token of my gratitude," and reaching beneath one of his wide sleeves he withdrew a bracelet and placed it upon my arm. He then went through the same ceremony with Thuvan Dihn.

Next he asked our names, and from what land we hailed. He seemed quite familiar with the geography of the outerworld, and when I said I was from Helium he raised his brows.

"Ah," he said, "you seek your ruler and his company?"

"Know you of them?" I asked.

"But little more than that they were captured by my uncle, Salensus Oll, Jeddak of Jeddaks, Ruler of Okar, land of the yellow men of Barsoom. As to their fate I know nothing, for I am at war with my uncle, who would crush my power in the principality of Marentina.

"These from whom you have just saved me are warriors he has sent out to find and slay me, for they know that often I come alone to hunt and kill the sacred apt which Salensus Oll so much reveres. It is partly because I hate his religion that Salensus Oll hates me; but mostly does he fear my growing power and the great faction which has arisen throughout Okar that would be glad to see me ruler of Okar and Jeddak of Jeddaks in his place.

"He is a cruel and tyrannous master whom all hate, and were it not for the great fear they have of him I could raise an army overnight that would wipe out the few that might remain loyal to him. My own people are faithful to me, and the little valley of Marentina has paid no tribute to the court of Salensus Oll for a year.

"Nor can he force us, for a dozen men may hold the narrow way to Marentina against a million. But now, as to thine own affairs. How may I aid you? My palace is at your disposal, if you wish to honor me by coming to Marentina."

"When our work is done we shall be glad to accept your invitation," I replied. "But now you can assist us most by directing us to the court of Salensus Oll, and suggesting some means by which we may gain admission to the city and the palace, or whatever other place we find our friends to be confined."

Talu gazed ruefully at our smooth faces and at Thuvan Dihn's red skin and my white one.

"First you must come to Marentina," he said, "for a great change must be wrought in your appearance before you can hope to enter any city in Okar. You must have yellow faces and black beards, and your apparel and trappings must be those least likely to arouse suspicion. In my palace is one who can make you appear as truly yellow men as does Salensus Oll himself."

His counsel seemed wise; and as there was apparently no other way to insure a successful entry to Kadabra, the capital city of Okar, we set out with Talu, Prince of Marentina, for his little, rock-bound country.

The way was over some of the worst traveling I have ever seen, and I do not wonder that in this land where there are neither thoats nor fliers that Marentina is in little fear of invasion; but at last we reached our destination, the first view of which I had from a slight elevation a half-mile from the city.

Nestled in a deep valley lay a city of Martian concrete, whose every street and plaza and open space was roofed with glass. All about lay snow and ice, but there was none upon the rounded, domelike, crystal covering that enveloped the whole city.

Then I saw how these people combated the rigors of the arctic, and lived in luxury and comfort in the midst of a land of perpetual ice. Their cities were veritable hothouses, and when I had come within this one my respect and admiration for the scientific and engineering skill of this buried nation was unbounded.

The moment we entered the city Talu threw off his outer garments of fur, as did we, and I saw that his apparel differed but little from that of the red races of Barsoom. Except for his leathern harness, covered thick with jewels and metal, he was naked, nor could one have comfortably worn apparel in that warm and humid atmosphere.

For three days we remained the guests of Prince Talu, and during that time he showered upon us every attention and courtesy within his power. He showed us all that was of interest in his great city.

The Marentina atmosphere plant will maintain life indefinitely in the cities of the north pole after all life upon the balance of dying Mars is extinct through the failure of the air supply, should the great central plant again cease functioning as it did upon that memorable occasion that gave me the opportunity of restoring life and happiness to the strange world that I had already learned to love so well.

He showed us the heating system that stores the sun's rays in great reservoirs beneath the city, and how little is necessary to maintain the perpetual summer heat of the glorious garden spot within this arctic paradise.

Broad avenues of sod sewn with the seed of the ocher vegetation of the dead sea bottoms carried the noiseless traffic of light and airy ground fliers that are the only form of artificial transportation used north of the gigantic ice-barrier.

The broad tires of these unique fliers are but rubber-like gas bags filled with the eighth Barsoomian ray, or ray of propulsion—that remarkable discovery of the Martians that has made possible the great fleets of mighty airships that render the red man of the outer world supreme. It is this ray which propels the inherent or reflected light of the planet off into space, and when confined gives to the Martian craft their airy buoyancy.

The ground fliers of Marentina contain just sufficient buoyancy in their automobile-like wheels to give the cars traction for steering purposes; and though the hind wheels are geared to the engine, and aid in driving the machine, the bulk of this work is carried by a small propeller at the stern.

I know of no more delightful sensation than that of riding in one of these luxuriously appointed cars which skim, light and airy as feathers, along the soft, mossy avenues of Marentina. They move with absolute noiselessness between borders of crimson sward and beneath arching trees gorgeous with the wondrous blooms that mark so many of the highly cultivated varieties of Barsoomian vegetation.

By the end of the third day the court barber—I can think of no other earthly appellation by which to describe him—had wrought so remarkable a transformation in both Thuvan Dihn and myself that our own wives would never have known us. Our skins were of the same lemon color as his own, and great, black beards and mustaches had been deftly affixed to our smooth faces.