Listening intently for a moment I heard no sound, either within or without the building, so that it was with considerable confidence that I started to ascend the ramp.
Upward I continued from floor to floor, each of which consisted of a single large chamber, a fact which finally convinced me that the building had been a warehouse for the storing of goods passing through this ancient port.
From the upper floor a wooden ladder extended upward through the center of the tower above. It was of solid skeel, which is practically indestructible, so that though I knew it might be anywhere from five hundred thousand to a million years old, I did not hesitate to trust myself to it.
The circular interior core of the tower, upward through which the ladder extended, was rather dark. At each landing there was an opening into the tower chamber at that point, but as many of these openings were closed only a subdued light penetrated to the central core.
I had ascended to the second level of the tower when I thought that I heard a strange noise beneath me.
Just the suggestion of a noise it was, but such utter silence had reigned over the deserted city that the faintest sound must have been appreciable to me.
Pausing in my ascent, I looked down, listening; but the sound which I had been unable to translate was not repeated, and I continued my way on upward.
Having it in my mind to climb as high up in the tower as possible, I did not stop to examine any of the levels that I passed.
Continuing upward for a considerable distance my progress was finally blocked by heavy planking that appeared to form the ceiling of the shaft. Some eight or ten feet below me was a small door that probably led to one of the upper levels of the tower and I could not but wonder why the ladder had been continued on upward above this doorway, since it could serve no practical purpose if it merely ended at the ceiling. Feeling above me with my fingers I traced the outlines of what appeared to be a trap door. Obtaining a firm footing upon the ladder as high up as I could climb, I placed a shoulder against the barrier. In this position I was able to exert considerable pressure upward with the result that presently I felt the planking rise above me and a moment later, to the accompaniment of subdued groans, the trap door swung upward upon ancient wooden hinges long unused. Clambering into the apartment above I found myself upon the top level of the tower, which rose to a height of some two hundred feet above the avenue below. Before me were the corroded remains of an ancient and long obsolete beacon-light, such as were used by the ancients long before the discovery of radium and its practical and scientific application to the lighting requirements of modern civilization upon Barsoom. These ancient lamps were operated by expensive machines which generated electricity, and this one was doubtless used as a beacon for the safe guidance of ancient mariners into the harbor, whose waters once rolled almost to the foot of the tower.
This upper level of the tower afforded an excellent view in all directions. To the north and northeast stretched a vast expanse. To the south was a range of low hills that curved gently in a northeasterly direction, forming in by-gone days the southern shore line of what is still known as the Gulf of Torquas. Toward the west I looked out over the ruins of a great city, which extended far back into low hills, the flanks of which it had mounted as it expanded from the sea shore. There in the distance I could still discern the ancient villas of the wealthy, while in the nearer foreground were enormous public buildings, the most pretentious of which were built upon the four sides of a large quadrangle that I could easily discern a short distance from the water-front. Here, doubtless, stood the official palace of the jeddak who once ruled the rich country of which this city was the capital and the principal port. 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.