had come, and there, to my delight, I saw an end of the gallery not a foot above my head. In an instant I had leaped to it and called Woola after me.

Here there were no reptiles—the way was clear to the opposite side of the hideous chamber—and a moment later Woola and I dropped down to safety in the corridor beyond.

Not ten minutes later we came into a vast circular apartment of white marble, the walls of which were inlaid with gold in the strange hieroglyphics of the First Born.

From the high dome of this mighty apartment a huge circular column extended to the floor, and as I watched I saw that it slowly revolved.

I had reached the base of the Temple of the Sun!

Somewhere above me lay Dejah Thoris, and with her were Phaidor, daughter of Matai Shang, and Thuvia of Ptarth. But how to reach them, now that I had found the only vulnerable spot in their mighty prison, was still a baffling riddle.

Slowly I circled the great shaft, looking for a means of ingress. Part way around I found a tiny radium flash torch, and as I examined it in mild curiosity as to its presence there in this almost inaccessible and unknown spot, I came suddenly upon the insignia of the house of Thurid jewel-inset in its metal case.

I am upon the right trail, I thought, as I slipped the bauble into the pocket-pouch which hung from my harness. Then I continued my search for the entrance, which I knew must be somewhere about; nor had I long to search, for almost immediately thereafter I came upon a small door so cunningly inlaid in the shaft’s base that it might have passed unnoticed by a less keen or careful observer.

There was the door that would lead me within the prison, but where was the means to open it? No button or lock were visible. Again and again I went carefully over every square inch of its surface, but the most that I could find was a tiny pinhole a little above and to the right of the door’s center—a pinhole that seemed only an accident of manufacture or an imperfection of material.

Into this minute aperture I attempted to peer, but whether it was but a fraction of an inch deep or passed completely through the door I could not tell—at least no light showed beyond it. I put my ear to it next and listened, but again my efforts brought negligible results.

During these experiments Woola had 

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