As we went forward, the sound became plainer continually, showing that we were heading straight toward it. Steadily, the roaring grew louder and nearer, until it appeared, as I remarked to Tonnison, almost to come from under our feet—and still we were surrounded by the trees and shrubs.

"Take care!" Tonnison called to me. "Look where you're going." And then, suddenly, we came out from among the trees, on to a great open space, where, not six paces in front of us, yawned the mouth of a tremendous chasm, from the depths of which the noise appeared to rise, along with the continuous, mistlike spray that we had witnessed from the top of the distant bank.

For quite a minute we stood in silence, staring in bewilderment at the sight; then my friend went forward cautiously to the edge of the abyss. I followed, and, together, we looked down through a boil of spray at a monster cataract of frothing water that burst, spouting, from the side of the chasm, nearly a hundred feet below.

"Good Lord!" said Tonnison.

I was silent, and rather awed. The sight was so unexpectedly grand and eerie; though this latter quality came more upon me later.

Presently, I looked up and across to the further side of the chasm. There, I saw something towering up among the spray: it looked like a fragment of a great ruin, and I touched Tonnison on the shoulder. He glanced 'round, with a start, and I pointed toward the thing. His gaze followed my finger, and his eyes lighted up with a sudden flash of excitement, as the object came within his field of view.

"Come along," he shouted above the uproar. "We'll have a look at it. There's something queer about this place; I feel it in my bones." And he started off, 'round the edge of the craterlike abyss. As we neared this new thing, I saw that I had not been mistaken in my first impression. It was undoubtedly a portion of some ruined building; yet now I made out that it was not built upon the edge of the chasm itself, as I had at first supposed; but perched almost at the extreme end of a huge spur of rock that jutted out some fifty or sixty feet over the abyss. In fact, the jagged mass of ruin was literally suspended in midair.

Arriving opposite it, we walked out on to the projecting arm of rock, and I must confess to having felt an intolerable sense of terror as I looked down from that dizzy perch into the unknown depths below us—into the deeps from which there rose ever the thunder of the falling water and the shroud of rising spray.

Reaching the ruin, we clambered 'round it cautiously, and, on the further side, came upon a mass of fallen stones and rubble. The ruin itself seemed to me, as I proceeded now to examine it minutely, to be a portion of the outer wall of some prodigious structure, it was so thick and substantially built; yet what it was doing in such a position I could by no means conjecture. Where was the rest of the house, or castle, or whatever there had been?

I went back to the outer side of the wall, and thence to the edge of the chasm, leaving Tonnison rooting systematically among the heap of stones and rubbish on the outer side. Then I commenced to examine the surface of the ground, near the edge of the abyss, to see whether there were not left other remnants of the building to which the fragment of ruin evidently belonged. But though I scrutinized the earth with the greatest care, I could see no signs of anything to show that there had ever been a building erected on the spot, and I grew more puzzled than ever.