I forgot Desiree and Harry; I lost all consciousness of where I was and what I was doing; the silent fury of the stream and the awful blackness maddened me; I plunged and struggled desperately, blindly, sobbing with rage. This could not have lasted much longer; I was very near the end.

Suddenly, with a thrill of joy, I realized that the speed of the current was decreasing. Then a reaction of despair seized me; I tried to strangle hope and resign myself to the worst. But soon there was no longer any doubt; the water carried me slower and slower.

I floated with little difficulty, wondering--could it be an approach to a smaller outlet which acted as a dam? Or was it merely a lessening of the incline of the bed of the stream? I cursed the darkness for my helplessness.

Finally the water became absolutely still, as I judged by the absence of pressure on my body, and I turned sharply at a right angle and began to swim. My weariness left me as by magic, and I struck out with bold and sweeping strokes; and by that lack of caution all but destroyed myself when my head suddenly struck against a wall of stone, unseen in the darkness.

I was stunned completely and sank; but the ducking revived me; and when I returned to the surface I swam a few careful strokes, searching for the wall. It was not there, and I had no idea of its direction. But I had now learned caution; and by swimming a few feet first one way, then another, and taking care not to go far in any one direction, I finally discovered it.

My hand easily reached the top, and, grasping the slippery surface with a grip made firm by despair, and concentrating every ounce of strength in one final effort, I drew myself out of the water and fell completely exhausted on the ground.

Under such circ.u.mstances time has no place in a man's calculations; he is satisfied to breathe. I believe that I lay barely conscious for several hours, but it may have been merely as many minutes. Then I felt life stir within me; I stretched my arms and legs and sat up.

Gradually entered my mind the thought of Desiree and Harry and the Andes above and Felipe shuddering with terror as he flew from the cave of the devil.

First came Harry; but hope did not enter. It was inconceivable that he, too, should have escaped that fearful torrent; stupendous luck alone had saved me from being dashed senseless against the rocks and guided me to the ledge on which I rested.

Then he was gone! I had no thought of my own peril. I had gone through the world with but little regard for what it held; nothing had been sacred to me; no affection had been more than a day's caprice; I had merely sucked amus.e.m.e.nt from its bitter fruit.

But I loved Harry; I realized it with something like astonishment. He was dear to me; a keen, intense pain contracted my chest at the thought of having lost him; tears filled my eyes; and I raised up my voice and sang out wildly:

"Harry! Harry, lad! Harry!"

The cavern resounded. The call went from wall to wall, then back again, floating through black s.p.a.ce with a curious tremor, and finally died away in some dim, unseen corridor. And then--then came an answering call!

Owing to the conflicting echoes of the cavern, the tone could not be recognized. But the word was unmistakable; it was "Paul."

I sprang to my feet with a shout, then stood listening. Out of the blackness surrounding me came the words, in Harry's voice, much lower, but distinct:

"Paul! Paul, where are you?"

"Thank Heaven!" I breathed; and I answered:

"Here, Harry boy, here."

"But where?"

"I don't know. On a ledge of rock at the edge of the water. Where are you?"

"Same place. Which side are you on?"

"The right side," I answered with heartfelt emphasis. "That is to say, the outside. If it weren't for this infernal darkness--Listen! How far away does my voice sound?"

But the innumerable echoes of the cavern walls made it impossible to judge of distance by sound. We tried it over and over; sometimes it seemed that we were only a few feet apart, sometimes a mile or more.

Then Harry spoke in a whisper, and his voice appeared to be directly in my ear. Never have I seen a night so completely black as that cavern; we had had several hours, presumably, for our eyes to adjust themselves to the phenomenon; but when I held my hand but six inches in front of my face I could not get even the faintest suggestion of its outline.

"This is useless," I declared finally. "We must experiment. Harry!"

"Yes."

"Turn to your left and proceed carefully along the edge. I'll turn to my right. Go easy, lad; feel your way."

I crawled on my hands and knees, no faster than a snail, feeling every inch of the ground. The surface was wet and slippery, and in places sloped at an angle that made me hang on for dear life to keep from shooting off into s.p.a.ce.

Meantime I kept calling to Harry and he to me; but, on account of our painfully slow progress, it was half an hour or more before we discovered that the distance between us was being increased instead of lessened.

He let fly an oath at this, and his tone was dangerous; no wonder if the lad was half crazed! I steadied him as well as I could with word of encouragement, and instructed him to turn about and proceed to the right of his original position. I, also, turned to the left.

Our hope of meeting lay in the probability that the ledge surrounded a circular body of water and was continuous. At some point, of course, was the entrance of the stream which had carried us, and at some other point there was almost certainly an outlet; but we trusted to luck to avoid these. Our chances were less than one in a thousand; but, failing that, some other means must be invented.

The simplest way would have been for me to take to the water and swim across to Harry, counting on his voice as a guide; but the conflicting echoes produced by the slightest sound rendered such an attempt dangerous.

I crept along that wet, slimy, treacherous surface, it seemed, for hours. I could see nothing--absolutely nothing; everything was black void; it was hard to appreciate reality in such a nightmare. On the one side, nameless dangers; on the other, the unseen, bottomless lake; enough, surely, to take a man's nerve. My fear for Harry killed anxiety on my own account. We kept continually calling:

"Harry!"

"Yes."

"Steady."

"Yes. I'm coming along. I say, we're closer, Paul."

I hesitated to agree with him, but finally there was no longer any doubt of it. His voice began to reach me almost in natural tones, which meant that we were near enough for the vibrations to carry without interference from the walls.

Nearer still it came; it was now only a matter of a few feet; Harry gave a cry of joy, and immediately afterward I heard his low gasp of terror and the sound of his wild scrambling to regain a foothold. In his excitement he had forgotten caution and had slipped to the edge of the water.

I dared not try to go to his a.s.sistance; so I crouched perfectly still and called to him to throw himself flat on his face. How my eyes strained despairingly as I cursed the pitiless darkness! Then the scrambling ceased and the boy's voice sounded:

"All right, Paul! All right! Gad, I nearly went!"

A minute later I held his hand in mine. At that point the incline was at a sharp angle, and we lay flat on our backs. For many minutes we lay silently gripping hands; Harry was trembling violently from nervous fatigue, and I myself was unable to speak.

What strength is there in companionship! Alone, either of us would probably have long before succ.u.mbed to the strain of our horrible situation; but we both took hope and courage from that hand-clasp.

Finally he spoke:

"In Heaven's name, where are we, Paul?"

"You know as much as I do, Harry. This cursed darkness makes it impossible even to guess at anything. According to Felipe, we are being entertained by the devil."

"But where are we? What happened? My head is dizzy--I don't know--"

I gripped his hand.

"And no wonder. 'Tis hardly an every-day occurrence to ride an underground river several miles under the Andes. Above us a mountain four miles high, beneath us a bottomless lake, round us darkness. Not a very cheerful prospect, Hal; but, thank Heaven, we take it together!

It is a grave--ours and hers. I guess Desiree knew what she was talking about."

There came a cry from Harry's lips--a cry of painful memory: