rough. I bore to the left as I advanced, keeping close to the outer edge. The other edge of the path I could not see. I clambered along hastily, and after a few moments was confronted by a row of rocks and bowlders lying directly across my line of progress. I followed their course for a short distance, and finally found a space through which I could pass.

"This transverse ridge was perhaps a hundred feet deep. Behind it and extending in a parallel direction lay a tremendous valley. I knew then I had reached my first objective.

"I sat down upon the brink of the precipice and watched the cavern growing ever wider and deeper. Then I realized that I must begin my descent if ever I was to reach the bottom. For perhaps six hours I climbed steadily downwards. It was a fairly easy descent after the first little while, for the ground seemed to open up before me as I advanced, changing its contour so constantly that I was never at a loss for an easy downward path.

"My feet suffered cruelly from the shaggy, metallic ground, and I soon had to stop and rig a sort of protection for the soles of them from a portion of the harness over my shoulder. According to the stature I was when I reached the bottom, I had descended perhaps twelve thousand feet during this time.

"The latter part of the journey found me nearing the bottom of the cañon. Objects around me no longer seemed to increase in size, as had been constantly the case before, and I reasoned that probably my stature was remaining constant.

"I noticed, too, as I advanced, a curious alteration in the form of light around me. The glare from above (the sky showed only as a narrow dull ribbon of blue) barely penetrated to the depths of the cañon's floor. But all about me there was a soft radiance, seeming to emanate from the rocks themselves.

"The sides of the cañon were shaggy and rough, beyond anything I had ever seen. Huge bowlders, hundreds of feet in diameter, were embedded in them. The bottom also was strewn with similar gigantic rocks.

"I surveyed this lonely waste for some time in dismay, not knowing in what direction lay my goal. I knew that I was at the bottom of the scratch, and by the comparison of its size I realized I was well started on my journey.

"I have not told you, gentlemen, that at the time I marked the ring I made a deeper indentation in one portion of the scratch and focused the microscope upon that. This 

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