Now a mammoth, a giant bull with tail raised and ears up-cocked, curled his trunk above his head and charged. But a score of the great cats, growling hideously, sprang to meet him, and the bull, losing his nerve, wheeled in a wide circle and returned to the herd. Had he gone through that menacing line of fangs and talons, as with his great size and weight and strength he might have done, he would have opened a hole through which a stampede of the other animals would have carried the bulk of them to safety.

The frightened herbivores, their attention centered upon the menacing tigers, paid little attention to the insignificant man-things passing among them. But there were some exceptions. A thag, bellowing and pawing the earth directly in their line of march, terrified by the odor of the carnivores and aroused and angered by the excited trumpeting and squealing of the creatures about him, seeking to vent his displeasure upon something, lowered his head and charged them. A Waziri warrior raised his rifle to his shoulder and fired, and a prehistoric Bos Primigenus crashed to the impact of a modern bullet.

As the report of the rifle sounded above the other noises of the clearing, the latter were momentarily stilled, and the full attention of hunters and hunted was focused upon the little band of men, so puny and insignificant in the presence of the mighty beasts of another day. A dinotherium, his little ears up-cocked, his tail stiffly erect, walked slowly toward them. Almost immediately others followed his example until it seemed that the whole aggregation was converging upon them. The forest was yet a hundred yards away as Jason Gridley realized the seriousness of the emergency that now confronted them.

"We shall have to run for it," he said. "Give them a volley, and then beat it for the trees. If they charge, it will have to be every man for himself."

The Waziri wheeled and faced the slowly advancing herd and then, at Gridley's command, they fired. The thunderous volley had its effect upon the advancing beasts. They hesitated and then turned and retreated; but behind them were the carnivores. And once again they swung back in the direction of the men, who were now moving rapidly toward the forest.

"Here they come!" cried Von Horst. And a backward glance revealed the fact that the entire herd, goaded to terror by the tigers behind them, had broken into a mad stampede. Whether or not it was a direct charge upon the little party of men is open to question, but the fact that they lay in its path was sufficient to seal their doom if they were unable to reach the safety of the forest ahead of the charging quadrupeds.

"Give them another volley!" cried Gridley. And again the Waziri turned and fired. A dinotherium, a thag and two mammoths stumbled and fell to the ground, but the remainder of the herd did not pause. Leaping over the carcasses of their fallen comrades they thundered down upon the fleeing men.

It was now, in truth, every man for himself, and so close pressed were they that even the brave Waziri threw away their rifles as useless encumbrances to flight.

Several of the red deer, swifter in flight than the other members of the herd, had taken the lead, and, stampeding through the party, scattered them to left and right.

Gridley and Von Horst were attempting to cover the retreat of the Waziri and check the charge of the stampeding animals with their revolvers. They succeeded in turning a few of the leaders, but presently a great, red stag passed between them, forcing them to jump quickly apart to escape his heavy antlers, and behind him swept a nightmare of terrified beasts forcing them still further apart.