A glance over my shoulder showed me that the copper-colored one had plunged in after me and was swimming rapidly in pursuit.  His mighty strokes bade fair to close up the distance between us in short order, for at best I could make but slow progress with my unfamiliar craft, which nosed stubbornly in every direction but that which I desired to follow, so that fully half my energy was expended in turning its blunt prow back into the course.

I had covered some hundred yards from shore when it became evident that my pursuer must grasp the stern of the skiff within the next half-dozen strokes.  In a frenzy of despair, I bent to the grandfather of all paddles in a hopeless effort to escape, and still the copper giant behind me gained and gained.

His hand was reaching upward for the stern when I saw a sleek, sinuous body shoot from the depths below.  The man saw it too, and the look of terror that overspread his face assured me that I need have no further concern as to him, for the fear of certain death was in his look.

And then about him coiled the great, slimy folds of a hideous monster of that prehistoric deep—­a mighty serpent of the sea, with fanged jaws, and darting forked tongue, with bulging eyes, and bony protuberances upon head and snout that formed short, stout horns.

As I looked at that hopeless struggle my eyes met those of the doomed man, and I could have sworn that in his I saw an expression of hopeless appeal.  But whether I did or not there swept through me a sudden compassion for the fellow.  He was indeed a brother-man, and that he might have killed me with pleasure had he caught me was forgotten in the extremity of his danger.

Unconsciously I had ceased paddling as the serpent rose to engage my pursuer, so now the skiff still drifted close beside the two.  The monster seemed to be but playing with his victim before he closed his awful jaws upon him and dragged him down to his dark den beneath the surface to devour him.  The huge, snakelike body coiled and uncoiled about its prey.  The hideous, gaping jaws snapped in the victim’s face.  The forked tongue, lightning-like, ran in and out upon the copper skin.

Nobly the giant battled for his life, beating with his stone hatchet against the bony armor that covered that frightful carcass; but for all the damage he inflicted he might as well have struck with his open palm.

At last I could endure no longer to sit supinely by while a fellowman was dragged down to a horrible death by that repulsive reptile.  Embedded in the prow of the skiff lay the spear that had been cast after me by him whom I suddenly desired to save.  With a wrench I tore it loose, and standing upright in the wobbly log drove it with all the strength of my two arms straight into the gaping jaws of the hydrophidian.

With a loud hiss the creature abandoned its prey to turn upon me, but the spear, imbedded in its throat, prevented it from seizing me though it came near to overturning the skiff in its mad efforts to reach me.