This I saw in time, but the first thing that caught my eye was no work of nature.  Fastened to the wall on the opposite side of the cavern, casting a dim, flickering light throughout its vast space, were two golden, flaming urns.

It was not fear, but a sort of nausea, that assailed me as I realized that I was still in the domain of the Incas.

The ledge on which I lay was exposed to view from nearly every point of the cavern, and the sight of those urns caused me to make a swift decision to leave it without delay.  It was wet and slippery and not over three feet in width; I rose to my feet cautiously, having no appetite for another ducking.

At a distance of several feet lay another ledge, broad and level, at the farther end of which rose a massive boulder.  I cleared the gap with a leap, barely made my footing, and passed behind the boulder through a crevice just wide enough to admit my body.

Then through a narrow lane onto another ledge, and from that I found my way into a dark recess which gave assurance at least of temporary safety.  The sides of the cavern were a veritable maze of boulders, sloping ledges, and narrow crevices.  Nature here scarcely seemed to have known what to do with herself.

I seated myself on a bit of projecting limestone, still wet and shivering.  I had no boots nor trousers; my feet were bruised and swollen, and my flannel shirt and woolen underwear were but scanty protection against the chill air, damp as they were.  Also, I seemed to feel a cold draft circling about me, and was convinced of the fact by the flickering flames in the golden urns.

Desolate, indeed, for I gave Harry up as lost.  The thought generated no particular feeling in me; death, by force of contrast, may even appear agreeable; and I told myself that Harry had been favored of the gods.

And there I sat in the half-darkness, shrinking from a danger of whose existence I was not certain, clinging miserably to the little that was left of what the world of sunshine had known as Paul Lamar, gentleman, scientist, and connoisseur of life; sans philosophy, sans hope, and—­sans-culotte.

But the senses remain; and suddenly I became aware of a movement in the water of the lake.  It was as though an immense trout had leaped and split the surface.  This was repeated several times, and was followed by a rhythmic sound like the regular splash of many oars.  Then silence.

I peered intently forth from my corner in the recess, but could see nothing, and finally gave it up.

As the minutes passed by my discomfort increased and stiffness began to take my joints.  I realized the necessity of motion, but lacked the will, and sat in a sort of dumb, miserable apathy.  This, I should say, for an hour; then I saw something that roused me.

I had before noticed that on the side of the cavern almost directly opposite me, under the flaming urns, there was a ledge some ten or twelve feet broad and easily a hundred in length.  It met the surface of the lake at an easy, gradual slope.  In the rear, exactly between the two urns, could be seen the dark mouth of a passage, evidently leading directly away from the cavern.