There, now, only silence reigns. It was indeed a depressing sight and one fraught with poignant prophecy for us of present-day Barsoom.

Where they battled valiantly but futilely against the menace of a constantly diminishing water supply, we are faced with a problem that far transcends theirs in the importance of its bearing upon the maintenance of life upon our planet. During the past several thousand years only the courage, resourcefulness and wealth of the red men of Barsoom have made it possible for life to exist upon our dying planet, for were it not for the great atmosphere plants conceived and built and maintained by the red race of Barsoom, all forms of air-breathing creatures would have become extinct thousands of years ago.

As I gazed out over the city, my mind occupied with these dismal thoughts, I again became aware of a sound coming from the interior of the tower beneath me, and, stepping to the open trap, I looked down into the shaft and there, directly below me, I saw that which might well make the stoutest Barsoomian heart quail-the hideous, snarling face of a great white ape of Barsoom.

As our eyes met the creature voiced an angry growl and, abandoning its former stealthy approach, rushed swiftly up the ladder. Acting almost mechanically I did the one and only thing that might even temporarily stay its rush upon me-I slammed down the heavy trap door above its head, and as I did so I saw for the first time that the door was equipped with a heavy wooden bar, and you may well believe that I lost no time in securing this, thus effectually barring the creature's ascent by this route into the veritable cul de sac in which I had placed myself.

Now, indeed, was I in a pretty predicament-two hundred feet above the city with my only avenue of escape cut off by one of the most feared of all the savage beasts of Barsoom.

I had hunted these creatures in Thark as a guest of the great green jeddak, Tars Tarkas, and I knew something of their cunning and resourcefulness as well as of their ferocity. Extremely man-like in conformation, they also approach man more closely than any other of the lower orders in the size and development of their brain. Occasionally these creatures are captured when young and trained to perform, and so intelligent are they that they can be taught to do almost anything that man can do that lies within the range of their limited reasoning capacity. Man has, however, never been able to subdue their ferocious nature and they are always the most dangerous of animals to handle, which probably accounts more even than their intelligence for the interest displayed by the large audiences that they unfailingly attract.

In Hastor I have paid a good price to see one of these creatures and now I found myself in a position where I should very gladly pay a good deal more not to see one, but from the noise he was making in the shaft beneath me it appeared to me that he was determined that I should have a free show and he a free meal. He was hurling himself as best he could against the trap door, above which I stood with some misgivings which were presently allayed when I realized that not even the vast strength of a white ape could avail against the still staunch and sturdy skeel of the ancient door.

Finally convinced that he could not come at me by this avenue, I set about taking stock of my situation. Circling the tower I examined its outward architecture by the simple expedient of leaning far outward above each of the four sides. Three sides terminated at the roof of the building a hundred and fifty feet below me, while the fourth extended to the pavement of the courtyard two hundred feet below. Like much of the architecture of ancient Barsoom, the surface of the tower was elaborately carved from top to bottom and at each level there were window embrasures, some of which were equipped with small stone balconies. As a rule there was but a single window to a level, and as the window for the level directly beneath never opened upon the same side of the tower as the window for the level above, there was always a distance of from thirty to forty feet between windows upon the same side, and, as I was examining the outside of the tower with a view to its offering me an avenue of escape, this point was of great importance to me, since a series of window ledges, one below another, would have proved a most welcome sight to a man in my position.

By the time I had completed my survey of the exterior of the tower, the ape had evidently come to the conclusion that he could not demolish the barrier that kept him from me and I hoped that he would abandon the idea entirely and depart. But when I lay down on the floor and placed an ear close to the door I could plainly hear him just below as he occasionally changed from one uncomfortable position to another upon the small ladder beneath me. I did not know to what extent these creatures might have developed pertinacity of purpose, but I hoped that he might soon tire of his vigil and his thoughts be diverted into some other channel. However, as the day wore to a close this possibility seemed to grow more and more remote until at last I became almost convinced that the creature had determined to lay siege until hunger or desperation forced me from my retreat.

How longingly I gazed at the beckoning hills beyond the city where lay my route toward the southwest-toward fabled Jahar.

The sun was low in the west. Soon would come the sudden transition from daylight to darkness, and then what? Perhaps the creature would abandon its vigil; hunger or thirst might attract it elsewhere, but how was I to know? How easily it might descend to the bottom of the tower and await me there, confident that sooner or later I must come down.

One unfamiliar with the traits of these savage creatures might wonder why, armed as I was with sword and pistol, I did not raise the trap door and give battle to my jailer. Had I known positively that he was the only white ape in the vicinity I should not have hesitated to do so, but experience assured me that there was doubtless an entire herd of them quartered in the ruined city. So scarce is the flesh they crave that it is their ordinary custom to hunt alone, so that in the event that they make a kill they may be more certain of retaining the prize for themselves, but if I should attack him he would most certainly raise such a row as to attract his fellows, in which event my chance for escape would have been reduced to the ultimate zero.

A single shot from my pistol might have dispatched him, but it was equally possible that it would not, for these great white apes of Barsoom are tremendous creatures, endowed with almost unbelievable vitality. Many of them stand fully fifteen feet in height and are endowed by nature with tremendous strength. Their very appearance is demoralizing to an enemy; their white, hairless bodies are in themselves repulsive to the eye of a red man; the great shock of white hair bristling erect upon their pates accentuates the brutality of their countenances, while their intermediary set of limbs, which they use either as arms or legs as necessity or whim suggests, render them most formidable antagonists. Quite generally they carry a club, in the use of which they are terribly proficient. One of them, therefore, seemed sufficiently a menace in itself, so that I had no desire to attract others of its kind, though I was fully aware that eventually I might be forced to carry the battle to him.

Just as the sun was setting my attention was attracted toward the water-front where the long shadows of the city were stretching far out across the dead sea bottom. Riding up the gentle acclivity toward the city was a party of green warriors, mounted upon their great savage thoats. There were perhaps twenty of them, moving silently over the soft moss that carpeted the bottom of the ancient harbor, the padded feet of their mounts giving forth no sound. Like specters, they moved in the shadows of the dying day, giving me further proof that Fate had led me to a most unfriendly shore, and then, as though to complete the trilogy of fearsome Barsoomian menaces, the roar of a banth rolled down out of the hills behind the city.

Safe from observation in the high tower above them, I watched the party as it emerged from the hollow of the harbor and rode out upon the avenue below me, and then for the first time I noted a small figure seated in front of one of the warriors. Darkness was coming swiftly now, but before the little cavalcade passed out of sight momentarily behind the corner of the building, as it entered another avenue leading toward the heart of the city, I thought that I recognized the little figure as that of a woman of my own race. That she was a captive was a foregone conclusion and I could not but shudder as I contemplated the fate that lay in store for her. Perhaps my own Sanoma Tora was in equal jeopardy. Perhaps-but no, that could not be possible-how could Sanoma Tora have fallen into the clutches of warriors of the fierce horde of Torquas?

It could not be she. No, that was impossible.