hat terrific hour when the earth
tilted on its axis, and night came, and a tropical world was turned into a
frigid one, and new kinds of life were born to fill it.

It must have been long after that, thought Langdon, that the first bear
came to replace the mammoth, the mastodon, and the monstrous beasts that
had been their company. And that first bear was the forefather of the
grizzly he and Bruce were setting forth to kill the next day!

So engrossed was Langdon in his thoughts that he did not hear a sound
behind him. And then something roused him.

It was as if one of the monsters he had been picturing in his imagination
had let out a great breath close to him. He turned slowly, and the next
moment his heart seemed to stop its beating; his blood seemed to grow cold
and lifeless in his veins.

Barring the ledge not more than fifteen feet from him, his great jaws
agape, his head moving slowly from side to side as he regarded his trapped
enemy, stood Thor, the King of the Mountains!

And in that space of a second or two Langdon's hands involuntarily gripped
at his broken rifle, and he decided that he was doomed!

CHAPTER SEVENTEEN

A broken, choking breath--a stifled sound that was scarcely a cry--was all
that came from Langdon's lips as he saw the monstrous grizzly looking at
him. In the ten seconds that followed he lived hours.

His first thought was that he was powerless--utterly powerless. He could
not even run, for the rock wall was behind him; he could not fling himself
valleyward, for there was a sheer fall of a hundred feet on that side. He
was face to face with death, a death as terrible as that which had
overtaken the dogs.

And yet in these last moments Langdon did not lose himself in terror. He
noted even the redness in the avenging grizzly's eyes. He saw the naked
scat along his back where one of his bullets had plowed; he saw the bare
spot where another of his bullets had torn its way through Thor's
fore-shoulder. And he believed, as he observed these things, that Thor had
deliberately trailed him, that the bear had followed him along the ledge
and had cornered him here that he might repay in full measure what had been
inflicted upon him.

Thor advanced--just one step; and then in that slow, graceful movement,
reared himself to full height. Langdon, even then, thought that he was
magnificent. On his part, the man did not move; he looked steadily up at
Thor, and he had made up his mind wha