As I wound up for the delivery, I held my nerves and muscles under absolute command, though the grinning jaws were hurtling toward me at terrific speed.  And then I let go, with every ounce of my weight and muscle and science in back of that throw.  The stone caught the hyaenodon full upon the end of the nose, and sent him bowling over upon his back.

At the same instant a chorus of shrieks and howls arose from the circle of spectators, so that for a moment I thought that the upsetting of their champion was the cause; but in this I soon saw that I was mistaken.  As I looked, the ape-things broke in all directions toward the surrounding hills, and then I distinguished the real cause of their perturbation.  Behind them, streaming through the pass which leads into the valley, came a swarm of hairy men—­gorilla-like creatures armed with spears and hatchets, and bearing long, oval shields.  Like demons they set upon the ape-things, and before them the hyaenodon, which had now regained its senses and its feet, fled howling with fright.  Past us swept the pursued and the pursuers, nor did the hairy ones accord us more than a passing glance until the arena had been emptied of its former occupants.  Then they returned to us, and one who seemed to have authority among them directed that we be brought with them.

When we had passed out of the amphitheater onto the great plain we saw a caravan of men and women—­human beings like ourselves—­and for the first time hope and relief filled my heart, until I could have cried out in the exuberance of my happiness.  It is true that they were a half-naked, wild-appearing aggregation; but they at least were fashioned along the same lines as ourselves—­there was nothing grotesque or horrible about them as about the other creatures in this strange, weird world.

But as we came closer, our hearts sank once more, for we discovered that the poor wretches were chained neck to neck in a long line, and that the gorilla-men were their guards.  With little ceremony Perry and I were chained at the end of the line, and without further ado the interrupted march was resumed.

Up to this time the excitement had kept us both up; but now the tiresome monotony of the long march across the sun-baked plain brought on all the agonies consequent to a long-denied sleep.  On and on we stumbled beneath that hateful noonday sun.  If we fell we were prodded with a sharp point.  Our companions in chains did not stumble.  They strode along proudly erect.  Occasionally they would exchange words with one another in a monosyllabic language.  They were a noble-appearing race with well-formed heads and perfect physiques.  The men were heavily bearded, tall and muscular; the women, smaller and more gracefully molded, with great masses of raven hair caught into loose knots upon their heads.  The features of both sexes were well proportioned—­there was not a face among them that would have been called