"In the meantime," I continued, "I may discover some means of winning my way alone to the land of the yellow men, but if I am unsuccessful one life only will have been sacrificed. Should we all go on and perish, there will be none to guide a succoring party to Dejah Thoris and your daughter."

"I shall not return and leave you here alone, John Carter," replied Thuvan Dihn. "Whether you go on to victory or death, the Jeddak of Ptarth remains at your side. I have spoken."

I knew from his tone that it were useless to attempt to argue the question, and so I compromised by sending Woola back with a hastily penned note enclosed in a small metal case and fastened about his neck. I commanded the faithful creature to seek Carthoris at Helium, and though half a world and countless dangers lay between I knew that if the thing could be done Woola would do it.

Equipped as he was by nature with marvelous speed and endurance, and with frightful ferocity that made him a match for any single enemy of the way, his keen intelligence and wondrous instinct should easily furnish all else that was needed for the successful accomplishment of his mission.

It was with evident reluctance that the great beast turned to leave me in compliance with my command, and ere he had gone I could not resist the inclination to throw my arms about his great neck in a parting hug. 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.