The flier reeled half over; the engine stopped; as one, the patched buoyancy tanks burst, and we plunged, headforemost, to the ground twenty feet beneath.
Fortunately none of us was injured, and when we had disentangled ourselves from the wreckage, and the lesser moon had burst again from below the horizon, we found that we were at the foot of a mighty ice-barrier, from which outcropped great patches of the granite hills which hold it from encroaching farther toward the south.
What fate! With the journey all but completed to be thus wrecked upon the wrong side of that precipitous and unscalable wall of rock and ice!
I looked at Thuvan Dihn. He but shook his head dejectedly.
The balance of the night we spent shivering in our inadequate sleeping silks and furs upon the snow that lies at the foot of the ice-barrier.
With daylight my battered spirits regained something of their accustomed hopefulness, though I must admit that there was little enough for them to feed upon.
"What shall we do?" asked Thuvan Dihn. "How may we pass that which is impassable?"
"First we must disprove its impassability," I replied. "Nor shall I admit that it is impassable before I have followed its entire circle and stand again upon this spot, defeated. The sooner we start, the better, for I see no other way, and it will take us more than a month to travel the weary, frigid miles that lie before us."
For five days of cold and suffering and privation we traversed the rough and frozen way which lies at the foot of the ice-barrier. Fierce, fur-bearing creatures attacked us by daylight and by dark. Never for a moment were we safe from the sudden charge of some huge demon of the north.
The apt was our most consistent and dangerous foe.
It is a huge, white-furred creature with six limbs, four of which, short and heavy, carry it swiftly over the snow and ice; while the other two, growing forward from its shoulders on either side of its long, powerful neck, terminate in white, hairless hands, with which it seizes and holds its prey.
Its head and mouth are more similar in appearance to those of a hippopotamus than to any other earthly animal, except that from the sides of the lower jawbone two mighty horns curve slightly downward toward the front.
Its two huge eyes inspired my greatest curiosity. They extend in two vast, oval patches from the center of the top of the cranium down either side of the head to below the roots of the horns, so that these weapons really grow out from the lower part of the eyes, which are composed of several thousand ocelli each.
This eye structure seemed remarkable in a beast whose haunts were upon a glaring field of ice and snow, and though I found upon minute examination of several that we killed that each ocellus is furnished with its own lid, and that the animal can at will close as many of the facets of his huge eyes as he chooses, yet I was positive that nature had thus equipped him because much of his life was to be spent in dark, subterranean recesses.
Shortly after this we came upon the hugest apt that we had seen. The creature stood fully eight feet at the shoulder, and was so sleek and clean and glossy that I could have sworn that he had but recently been groomed.
He stood head-on eyeing us as we approached him, for we had found it a waste of time to attempt to escape the perpetual bestial rage which seems to possess these demon creatures, who rove the dismal north attacking every living thing that comes within the scope of their far-seeing eyes.
Even when their bellies are full and they can eat no more, they kill purely for the pleasure which they derive from taking life, and so when this particular apt failed to charge us, and instead wheeled and trotted away as we neared him, I should have been greatly surprised had I not chanced to glimpse the sheen of a golden collar about its neck.
Thuvan Dihn saw it, too, and it carried the same message of hope to us both. Only man could have placed that collar there, and as no race of Martians of which we knew aught ever had attempted to domesticate the ferocious apt, he must belong to a people of the north of whose very existence we were ignorant-possibly to the fabled yellow men of Barsoom; that once powerful race which was supposed to be extinct, though sometimes, by theorists, thought still to exist in the frozen north.
Simultaneously we started upon the trail of the great beast. Woola was quickly made to understand our desires, so that it was unnecessary to attempt to keep in sight of the animal whose swift flight over the rough ground soon put him beyond our vision.
For the better part of two hours the trail paralleled the barrier, and then suddenly turned toward it through the roughest and seemingly most impassable country I ever had beheld.
Enormous granite boulders blocked the way on every hand; deep rifts in the ice threatened to engulf us at the least misstep; and from the north a slight breeze wafted to our nostrils an unspeakable stench that almost choked us.
For another two hours we were occupied in traversing a few hundred yards to the foot of the barrier.
Then, turning about the corner of a wall-like outcropping of granite, we came upon a smooth area of two or three acres before the base of the towering pile of ice and rock that had baffled us for days, and before us beheld the dark and cavernous mouth of a cave.
From this repelling portal the horrid stench was emanating, and as Thuvan Dihn espied the place he halted with an exclamation of profound astonishment.
"By all my ancestors!" he ejaculated. "That I should have lived to witness the reality of the fabled Carrion Caves! If these indeed be they, we have found a way beyond the ice-barrier.
"The ancient chronicles of the first historians of Barsoom-so ancient that we have for ages considered them mythology-record the passing of the yellow men from the ravages of the green hordes that overran Barsoom as the drying up of the great oceans drove the dominant races from their strongholds.
"They tell of the wanderings of the remnants of this once powerful race, harassed at every step, until at last they found a way through the ice-barrier of the north to a fertile valley at the pole.
"At the opening to the subterranean passage that led to their haven of refuge a mighty battle was fought in which the yellow men were victorious, and within the caves that gave ingress to their new home they piled the bodies of the dead, both yellow and green, that the stench might warn away their enemies from further pursuit.
"And ever since that long-gone day have the dead of this fabled land been carried to the Carrion Caves, that in death and decay they might serve their country and warn away invading enemies. Here, too, is brought, so the fable runs, all the waste stuff of the nation-everything that is subject to rot, and that can add to the foul stench that assails our nostrils.
"And death lurks at every step among rotting dead, for here the fierce apts lair, adding to the putrid accumulation with the fragments of their own prey which they cannot devour. It is a horrid avenue to our goal, but it is the only one."
"You are sure, then, that we have found the way to the land of the yellow men?" I cried.
"As sure as may be," he replied; "having only ancient legend to support my belief. But see how closely, so far, each detail tallies with the world-old story of the hegira of the yellow race. Yes, I am sure that we have discovered the way to their ancient hiding place."
"If it be true, and let us pray that such may be the case," I said, "then here may we solve the mystery of the disappearance of Tardos Mors, Jeddak of Helium, and Mors Kajak, his son, for no other spot upon Barsoom has remained unexplored by the many expeditions and the countless spies that have been searching for them for nearly two years. The last word that came from them was that they sought Carthoris, my own brave son, beyond the ice-barrier."