Following the escape of their human victim, the wolves had maintained a frightful and most discordant howling, as if angered beyond expression at the style in which they had been baffled of their prey.

The lad sat listening to this, when suddenly it ceased. Silence from each beast came as completely and simultaneously as if they were members of an orchestra subject to the wand of such an enchanter as Theodore Thomas. What could it be?

For the space of two or three minutes the silence remained as profound as that of the tomb, and then there came a rush and patter, made by the wolves as they fled pell-mell.

At first sight this seemed a reason for congratulation in getting rid of such unwelcome company; but Fred saw in it more cause for alarm. Very evidently the creatures would not have left the spot in such a hurry unless they were frightened away by some wild animal more to be dreaded than themselves.

“I'm afraid I'll have to use my rifle,” he thought, as he moved softly downward until he reached a point from which he could see anything that passed beneath. “It's pretty rough to have to fire a fellow's last shot, when he's likely to starve to death for it; but a beast that can scare away a pack of wolves is likely to be one that will take a well-aimed bullet to stop—-”

This train of thought was abruptly checked by a sight which almost paralyzed him. He could dimly discern the ground beneath, and he was watching and listening when a large figure came to view, and halted directly beneath him, where the first wolf had sat upon his haunches and looked so longingly upward.

No noise could be heard and it seemed to move like a phantom; but, even in the gloom, the peculiar swinging motion of the body showed prodigious strength and activity. There could be no doubt, either, that the animal was a climber, and therefore more to be feared than a thousand wolves.

Fred had gained quite a knowledge of the animals of the country on his way across the plains, and in the indistinct view obtained he made up his mind that this was that most dangerous of wild beasts in the Southwest, the American cougar. If such were the case, the lad's only defense lay in the single charge of his rifle. The cougar could leap among the limbs as easily as a cat bounds from the floor into the chair.

Fred had left his rifle beyond his reach, and he was about to climb up to it, when the possibility occurred to him that, perhaps, the cougar was not aware that any one was in the tree, and, if unmolested might pass by. Accordingly, the fugitive remained as motionless as a statue, his eyes fixed upon the dreaded brute, ready to make for his gun the instant the cougar showed any sign of making for him.

The animal, known in some parts of the country as the panther, or “painter,” remained equally motionless. It looked precisely as if he suspected that something was in the wind and had slipped up to this point to listen for some evidence of what it was. Fred, who had heard fabulous stories of the “smelling” powers of all wild animals, feared that the cougar would scent him out, but he showed no evidence of his ability to do so.