The two white men, momentarily forgetting the tigers behind them in their amazement at the sight ahead, halted and looked with wonder upon the huge gathering of creatures within the clearing. But it soon became apparent that if they were to escape with their lives they must reach the safety of the trees before they were either dragged down by the saber-tooths or trampled to death by the frightened herbivores which were already milling around looking for an avenue of escape.

"There is still one opening ahead of us, bwana," said Muviro, the black chief of the Waziri.

"We shall have to run for it," said Gridley. "The beasts are all headed in our direction now. Give them a volley, and then beat it for the trees. If they charge, it will be every man for himself."

The volley turned them back for an instant; but when they saw the great cats behind them, they wheeled about once more in the direction of the men.

"Here they come!" cried von Horst. Then the men broke into a run as they sought to reach the trees that offered the only sanctuary.

Gridley was bowled over by a huge sloth; then he scrambled to his feet just in time to leap from the path of a fleeing mastodon and reach a tree just as the main body of the stampeding herd closed about it. A moment later, temporarily safe among the branches, he looked about for his companions; but none was in sight, nor could any living thing so puny as man have remained alive beneath that solid mass of leaping, plunging, terrified beasts. Some of his fellows, he felt sure, might have reached the forest in safety; but he feared for von Horst, who had been some little distance in rear of the Waziri. But Lieutenant Wilhelm von Horst had escaped. In fact, he had succeeded in running some little distance into the forest without having to take to the trees. He had borne off to the right, away from the escaping animals, which had veered to the left after they entered the forest. He could hear them thundering away in the distance, squealing and trumpeting, grunting and bellowing.