But, alas! hardly had I taken a score of steps than I stepped on a bit of ground which appeared solid enough, but which proved to be nothing but a mass of dead brushwood lying over a veritable chasm. The whole mass gave way, and with a lurch I was hurled forward into black space.

As I went down I put out my hands to save myself. But, though I caught hold of several roots and bits of rocks, this did not avail; and I did not stop descending until I struck a stone flooring twenty feet below the top of the opening. Fortunately the floor was covered with a large mass of half-decayed brush, otherwise the fall must have been a serious if not a fatal one.

As I went down, on hands and knees, a lot of loose branches, dirt, and small stones rolled on top of me, and for the minute I had a vision of being buried alive. But the downfall soon ceased; and, finding no bones broken, I crawled from under the load and surveyed the situation.

I felt that I was now worse off than ever. The well-hole—I can call it nothing else—was about ten feet in diameter, and the walls were almost smooth. The top of the opening was far out of my reach, and, as for a means of escape, there seemed to be none.

However, I was not to be daunted thus easily, and, striking a match and lighting a cedar branch, I set about looking for some spot where I might climb up. But the spot did not present itself.

But something else did, and that was an opening leading directly into the mountain. On pulling at a projecting rock, I felt it quiver, and had just time to leap back, when it fell at my feet. Behind the rock was a pitch-black hole, into which I thrust the lighted branch curiously. There was a cave beyond—how large was yet to be discovered.

I had no desire to explore any cave at that moment, my one idea being to get out of the well-hole and proceed on my way. But getting out of the hole was impossible, and I was forced to remain where I was, much to my disgust and alarm.

Jorge had been right about the coming storm. At an hour after sunset I heard the distant rumble of thunder, and soon a lively breeze blew through the trees and brush on the mountain side. A few flashes of lightning followed, and then came a heavy downpour of rain.

Not wishing to be soaked, I retreated to the cave I had discovered, although with caution, for I had no desire to take another tumble into a deeper hole. But the floor of the cavern appeared to be quite level, and with rising curiosity I took up my lighted cedar branch, whirled it around to make it blaze up, and started on a tour of investigation and discovery.

That I should not miss my way back, I lit a pile of small brush at the mouth of the opening. Then I advanced down a stony corridor, irregular in shape, but about fifty feet wide by half as high.