It was several seconds before the sounds upon the opposite side of the partition jolted my slowly returning faculties into a realization of their probable import, and then of a sudden I grasped the fact that they were caused by Tars Tarkas in what was evidently a desperate struggle with wild beasts or savage men.

With a cry of encouragement I threw my weight against the secret door, but as well have assayed the down-hurling of the cliffs themselves. Then I sought feverishly for the secret of the revolving panel, but my search was fruitless, and I was about to raise my longsword against the sullen gold when the young woman prisoner called out to me.

"Save thy sword, O Mighty Warrior, for thou shalt need it more where it will avail to some purpose-shatter it not against senseless metal which yields better to the lightest finger touch of one who knows its secret."

"Know you the secret of it then?" I asked.

"Yes; release me and I will give you entrance to the other horror chamber, if you wish. The keys to my fetters are upon the first dead of thy foemen. But why would you return to face again the fierce banth, or whatever other form of destruction they have loosed within that awful trap?"

"Because my friend fights there alone," I answered, as I hastily sought and found the keys upon the carcass of the dead custodian of this grim chamber of horrors.

There were many keys upon the oval ring, but the fair Martian maid quickly selected that which sprung the great lock at her waist, and freed she hurried toward the secret panel.

Again she sought out a key upon the ring. This time a slender, needle-like affair which she inserted in an almost invisible hole in the wall. Instantly the door swung upon its pivot, and the contiguous section of the floor upon which I was standing carried me with it into the chamber where Tars Tarkas fought.

The great Thark stood with his back against an angle of the walls, while facing him in a semi-circle a half-dozen huge monsters crouched waiting for an opening. Their blood-streaked heads and shoulders testified to the cause of their wariness as well as to the swordsmanship of the green warrior whose glossy hide bore the same mute but eloquent witness to the ferocity of the attacks that he had so far withstood.

Sharp talons and cruel fangs had torn leg, arm, and breast literally to ribbons. So weak was he from continued exertion and loss of blood that but for the supporting wall I doubt that he even could have stood erect. But with the tenacity and indomitable courage of his kind he still faced his cruel and relentless foes-the personification of that ancient proverb of his tribe: "Leave to a Thark his head and one hand and he may yet conquer."

As he saw me enter, a grim smile touched those grim lips of his, but whether the smile signified relief or merely amusement at the sight of my own bloody and dishevelled condition I do not know.

As I was about to spring into the conflict with my sharp long-sword I felt a gentle hand upon my shoulder and turning found, to my surprise, that the young woman had followed me into the chamber.

"Wait," she whispered, "leave them to me," and pushing me advanced, all defenceless and unarmed, upon the snarling banths.

When quite close to them she spoke a single Martian word in low but peremptory tones. Like lightning the great beasts wheeled upon her, and I looked to see her torn to pieces before I could reach her side, but instead the creatures slunk to her feet like puppies that expect a merited whipping.

Again she spoke to them, but in tones so low I could not catch the words, and then she started toward the opposite side of the chamber with the six mighty monsters trailing at heel. One by one she sent them through the secret panel into the room beyond, and when the last had passed from the chamber where we stood in wide-eyed amazement she turned and smiled at us and then herself passed through, leaving us alone.

For a moment neither of us spoke. Then Tars Tarkas said:

"I heard the fighting beyond the partition through which you passed, but I did not fear for you, John Carter, until I heard the report of a revolver shot. I knew that there lived no man upon all Barsoom who could face you with naked steel and live, but the shot stripped the last vestige of hope from me, since you I knew to be without firearms. Tell me of it."

I did as he bade, and then together we sought the secret panel through which I had just entered the apartment-the one at the opposite end of the room from that through which the girl had led her savage companions.

To our disappointment the panel eluded our every effort to negotiate its secret lock. We felt that once beyond it we might look with some little hope of success for a passage to the outside world.

The fact that the prisoners within were securely chained led us to believe that surely there must be an avenue of escape from the terrible creatures which inhabited this unspeakable place.

Again and again we turned from one door to another, from the baffling golden panel at one end of the chamber to its mate at the other-equally baffling.

When we had about given up all hope one of the panels turned silently toward us, and the young woman who had led away the banths stood once more beside us.

"Who are you?" she asked, "and what your mission, that you have the temerity to attempt to escape from the Valley Dor and the death you have chosen?"

"I have chosen no death, maiden," I replied. "I am not of Barsoom, nor have I taken yet the voluntary pilgrimage upon the River Iss. My friend here is Jeddak of all the Tharks, and though he has not yet expressed a desire to return to the living world, I am taking him with me from the living lie that hath lured him to this frightful place.

"I am of another world. I am John Carter, Prince of the House of Tardos Mors, Jeddak of Helium. Perchance some faint rumour of me may have leaked within the confines of your hellish abode."

She smiled.

"Yes," she replied, "naught that passes in the world we have left is unknown here. I have heard of you, many years ago. The therns have ofttimes wondered whither you had flown, since you had neither taken the pilgrimage, nor could be found upon the face of Barsoom."

"Tell me," I said, "and who be you, and why a prisoner, yet with power over the ferocious beasts of the place that denotes familiarity and authority far beyond that which might be expected of a prisoner or a slave?"

"Slave I am," she answered. "For fifteen years a slave in this terrible place, and now that they have tired of me and become fearful of the power which my knowledge of their ways has given me I am but recently condemned to die the death."

She shuddered.

"What death?" I asked.

"The Holy Therns eat human flesh," she answered me; "but only that which has died beneath the sucking lips of a plant man-flesh from which the defiling blood of life has been drawn. And to this cruel end I have been condemned. It was to be within a few hours, had your advent not caused an interruption of their plans."

"Was it then Holy Therns who felt the weight of John Carter's hand?" I asked.

"Oh, no; those whom you laid low are lesser therns; but of the same cruel and hateful race. The Holy Therns abide upon the outer slopes of these grim hills, facing the broad world from which they harvest their victims and their spoils.

"Labyrinthine passages connect these caves with the luxurious palaces of the Holy Therns, and through them pass upon their many duties the lesser therns, and hordes of slaves, and prisoners, and fierce beasts; the grim inhabitants of this sunless world.

"There be within this vast network of winding passages and countless chambers men, women, and beasts who, born within its dim and gruesome underworld, have never seen the light of day-nor ever shall.