I scrambled up the iron grating of the window until I could catch a good footing on the sill with one foot; then I let go my hold and sprang for the partition top.

"What was that?" I heard the deep voice of the black bellow as my metal grated against the stone wall as I slipped over. Then I dropped lightly to the floor of the cell beyond.

"Where is the white slave?" again cried the guard.

"I know not," replied Xodar. "He was here even as you entered. I am not his keeper-go find him."

The black grumbled something that I could not understand, and then I heard him unlocking the door into one of the other cells on the further side. Listening intently, I caught the sound as the door closed behind him. Then I sprang once more to the top of the partition and dropped into my own cell beside the astonished Xodar.

"Do you see now how we will escape?" I asked him in a whisper.

"I see how you may," he replied, "but I am no wiser than before as to how I am to pass these walls. Certain it is that I cannot bounce over them as you do."

We heard the guard moving about from cell to cell, and finally, his rounds completed, he again entered ours. When his eyes fell upon me they fairly bulged from his head.

"By the shell of my first ancestor!" he roared. "Where have you been?"

"I have been in prison since you put me here yesterday," I answered. "I was in this room when you entered. You had better look to your eyesight."

He glared at me in mingled rage and relief.

"Come," he said. "Issus commands your presence."

He conducted me outside the prison, leaving Xodar behind. There we found several other guards, and with them the red Martian youth who occupied another cell upon Shador.

The journey I had taken to the Temple of Issus on the preceding day was repeated. The guards kept the red boy and myself separated, so that we had no opportunity to continue the conversation that had been interrupted the previous night.

The youth's face had haunted me. Where had I seen him before. There was something strangely familiar in every line of him; in his carriage, his manner of speaking, his gestures. I could have sworn that I knew him, and yet I knew too that I had never seen him before.

When we reached the gardens of Issus we were led away from the temple instead of toward it. The way wound through enchanted parks to a mighty wall that towered a hundred feet in air.

Massive gates gave egress upon a small plain, surrounded by the same gorgeous forests that I had seen at the foot of the Golden Cliffs.

Crowds of blacks were strolling in the same direction that our guards were leading us, and with them mingled my old friends the plant men and great white apes.

The brutal beasts moved among the crowd as pet dogs might. If they were in the way the blacks pushed them roughly to one side, or whacked them with the flat of a sword, and the animals slunk away as in great fear.

Presently we came upon our destination, a great amphitheatre situated at the further edge of the plain, and about half a mile beyond the garden walls.

Through a massive arched gateway the blacks poured in to take their seats, while our guards led us to a smaller entrance near one end of the structure.

Through this we passed into an enclosure beneath the seats, where we found a number of other prisoners herded together under guard. Some of them were in irons, but for the most part they seemed sufficiently awed by the presence of their guards to preclude any possibility of attempted escape.

During the trip from Shador I had had no opportunity to talk with my fellow-prisoner, but now that we were safely within the barred paddock our guards abated their watchfulness, with the result that I found myself able to approach the red Martian youth for whom I felt such a strange attraction.

"What is the object of this assembly?" I asked him. "Are we to fight for the edification of the First Born, or is it something worse than that?"

"It is a part of the monthly rites of Issus," he replied, "in which black men wash the sins from their souls in the blood of men from the outer world. If, perchance, the black is killed, it is evidence of his disloyalty to Issus-the unpardonable sin. If he lives through the contest he is held acquitted of the charge that forced the sentence of the rites, as it is called, upon him.

"The forms of combat vary. A number of us may be pitted together against an equal number, or twice the number of blacks; or singly we may be sent forth to face wild beasts, or some famous black warrior."

"And if we are victorious," I asked, "what then-freedom?"

He laughed.

"Freedom, forsooth. The only freedom for us death. None who enters the domains of the First Born ever leave. If we prove able fighters we are permitted to fight often. If we are not mighty fighters-" He shrugged his shoulders. "Sooner or later we die in the arena."

"And you have fought often?" I asked.

"Very often," he replied. "It is my only pleasure. Some hundred black devils have I accounted for during nearly a year of the rites of Issus. My mother would be very proud could she only know how well I have maintained the traditions of my father's prowess."

"Your father must have been a mighty warrior!" I said. "I have known most of the warriors of Barsoom in my time; doubtless I knew him. Who was he?"

"My father was-"

"Come, calots!" cried the rough voice of a guard. "To the slaughter with you," and roughly we were hustled to the steep incline that led to the chambers far below which let out upon the arena.

The amphitheatre, like all I had ever seen upon Barsoom, was built in a large excavation. Only the highest seats, which formed the low wall surrounding the pit, were above the level of the ground. The arena itself was far below the surface.

Just beneath the lowest tier of seats was a series of barred cages on a level with the surface of the arena. Into these we were herded. But, unfortunately, my youthful friend was not of those who occupied a cage with me.

Directly opposite my cage was the throne of Issus. Here the horrid creature squatted, surrounded by a hundred slave maidens sparkling in jewelled trappings. Brilliant cloths of many hues and strange patterns formed the soft cushion covering of the dais upon which they reclined about her.

On four sides of the throne and several feet below it stood three solid ranks of heavily armed soldiery, elbow to elbow. In front of these were the high dignitaries of this mock heaven-gleaming blacks bedecked with precious stones, upon their foreheads the insignia of their rank set in circles of gold.

On both sides of the throne stretched a solid mass of humanity from top to bottom of the amphitheatre. There were as many women as men, and each was clothed in the wondrously wrought harness of his station and his house. With each black was from one to three slaves, drawn from the domains of the therns and from the outer world. The blacks are all "noble." There is no peasantry among the First Born. Even the lowest soldier is a god, and has his slaves to wait upon him.

The First Born do no work. The men fight-that is a sacred privilege and duty; to fight and die for Issus. The women do nothing, absolutely nothing. Slaves wash them, slaves dress them, slaves feed them. There are some, even, who have slaves that talk for them, and I saw one who sat during the rites with closed eyes while a slave narrated to her the events that were transpiring within the arena.

The first event of the day was the Tribute to Issus. It marked the end of those poor unfortunates who had looked upon the divine glory of the goddess a full year before. There were ten of them-splendid beauties from the proud courts of mighty Jeddaks and from the temples of the Holy Therns. For a year they had served in the retinue of Issus; to-day they were to pay the price of this divine preferment with their lives; tomorrow they would grace the tables of the court functionaries.