Out of this passage there suddenly appeared the forms of two Incas.  In the hand of each was what appeared to be a long spear—­I had evidently been mistaken in my presumption of their ignorance of weapons.

They walked to one end of the long ledge and dragged out into the light an object with a flat surface some six feet square.  This they launched on the surface of the lake; then embarked on it, placing their spears by their sides and taking up, instead, two broad, short oars.  With these they began to paddle their perilous craft toward the center of the lake with short, careful strokes.

About a hundred feet from the shore they ceased paddling and exchanged the oars for their spears, and stood motionless and silent, waiting, apparently, for nothing.

I, also, remained motionless, watching them in dull curiosity.  There was little danger of being seen; for, aside from the darkness of my corner, which probably would have been no hindrance to them, a projecting ledge partly screened my body from view.

The wait was not a long one, and when it ended things happened with so startling a suddenness that I scarcely grasped the details.

There was a loud splash in the water like that I had heard before, a swift ripple on the surface of the lake, and simultaneously the two Indians lunged with their spears, which flew to their mark with deadly accuracy.  I had not before noticed the thongs, one end of which was fastened to the shaft of the spear and the other about the waist of the savage.

There followed a battle royal.  Whatever the thing was that had felt the spears, it certainly lost no time in showing its resentment.  It thrashed the water into furious waves until I momentarily expected the raft to be swamped.

One Inca stood on the farther edge of the craft desperately plying an oar; the other tugged lustily at the spear-thongs.  I could see a black, twisting form leap from the water directly toward the raft, and the oarsman barely drew from under before it fell.  It struck the corner of the raft, which tipped perilously.

That appeared to have been a final effort, for there the battle ended.  The oarsman made quickly for the shore, paddling with remarkable dexterity and swiftness, while the other stood braced, holding firmly to the spear-thongs.  Another minute and they had leaped upon the ledge, drawing the raft after them, and, by tugging together on the lines, had landed their victim of the deep.

It appeared to be a large black fish of a shape I had never before seen.  But it claimed little of my attention; my eye was on the two spears which had been drawn from the still quivering body and which now lay on the ground well away from the water’s edge, while the two Incas were dragging their catch toward the mouth of the passage leading from the cavern.

I wanted those spears.  I did not stop to ask myself what I intended to do with them; if I had I would probably have been hard put to it for an answer.  But I wanted them, and I sat in my dark corner gazing at them with greedy eyes.