Muviro had stopped beside the two whites and was gazing in wide-eyed astonishment at the scene before him.

"Well," asked Gridley, "what do you make of it, Muviro?"

"I think I understand now, Bwana," replied the black, "and if we are ever going to escape our one chance is to cross that clearing as quickly as possible. The great cats are herding these creatures here and presently there will be such a killing as the eyes of man have never before seen. If we are not killed by the cats, we shall be trampled to death by these beasts in their efforts to escape or to fight the tigers."

"I believe you are right, Muviro," said Gridley.

"There is an opening just ahead of us," said Von Horst.

Gridley called the men around him and pointed out across the clearing to the forest upon the opposite side. "Apparently our only chance now," he said, "is to cross before the cats close in on these beasts. We have already come into the clearing too far to try to take refuge in the trees on this side for the saber-tooths are too close. Stick close together and fire at nothing unless we are charged."

"Look!" exclaimed Von Horst. "The tigers are entering the clearing from all sides. They have surrounded their quarry."

"There is still the one opening ahead of us, Bwana," said Muviro.

Already the little party was moving slowly across the clearing, which was covered with nervous beasts moving irritably to and fro, their whole demeanor marked by nervous apprehension. Prior to the advent of the tigers the animals had been moving quietly about, some of them grazing on the short grass of the clearing or upon the leaves and twigs of the scattered trees growing in it; but with the appearance of the first of the carnivores their attitude changed. A huge, bull mastodon raised his trunk and trumpeted shrilly, and instantly every herbivore was on the alert. And as eyes or nostrils detected the presence of the great cats, or the beasts became excited by the excitement of their fellows, each added his voice to the pandemonium that now reigned. To the squealing, trumpeting and bellowing of the quarry were added the hideous growls and roars of the carnivores.

"Look at those cats!" cried Von Horst. "There must be hundreds of them." Nor was his estimate an exaggeration for from all sides of the clearing, with the exception of a single point opposite them, the cats were emerging from the forest and starting to circle the herd. That they did not rush it immediately evidenced their respect for the huge beasts they had corraled, the majority of which they would not have dared to attack except in superior numbers.