By-and-by there was a sharp pattering upon the ground, and then the hoarse howling changed to quick, dog-like yelps, such as these animals emit when leaping down upon their prey, and which may be supposed to mean exultation.

Fred came down sufficiently far from his perch to get a glimpse of the ground beneath.  He saw nearly a score of huge mountain wolves, bounding hither and thither, and over each other, and back and forth, as though going through some preliminary exercise, so as to prepare themselves for the feast that was soon to be theirs.

“If I was down there,” thought the boy, with a shudder, “I suppose I’d last them about two minutes, and then they’d be hungrier than ever.  They’ll stay there all night, but I wonder if they’ll go away in the morning.  If they don’t, I can’t tell what’s to become of me.”

He watched them awhile with a lingering fear that some of them might manage to get among the branches, but they did not make the attempt.  They had sufficient dexterity to leap from the ground up among the lowermost limbs, but had no power of retaining their position, or doing anything after they got there.

Nature had unfitted them for such work, and they did not try it.  They seemed to possess tireless activity, and they kept up their leaping and frolicing as though they had nothing else in the world to do.

After watching them until he was tired, Fred carefully climbed up among the branches again, where he secured himself as firmly as was possible.  He had lain his rifle across a couple of limbs above his head, and fixed upon a place within a dozen feet or so of the top, as the one offering the best support.

Here two or three limbs were gnarled and twisted in such a way that he could seat himself and arrange his body in such a way that he could have enjoyed a night’s slumber with as much refreshment as if stretched out upon a blanket on the ground.  But the serenade below was not calculated to soothe his nerves into soft, downy sleep, and he shuddered at the thought of sitting where he was for four or five hours, with the pattering feet below him, varied by a yelp or howl, when he should feel disposed to close his eyes.

“But, then, it can’t be helped,” he added to himself, endeavoring to look philosophically at the matter.  “I ought to be thankful that they didn’t catch me before I reached the tree, and so I am; and I would be very thankful, too, if they would go away and leave me alone.  I’ve got a bed here twice as good as I expected to find, and could sleep as well as anywhere else.”

Almost any sound long continued becomes monotonous, and thus it was that scarcely a half-hour had passed when, in spite of the dreadful beasts below, his eyes began to grow heavy and his head to droop.

But at this juncture he received a terrible shock.  Just as everything was becoming dreamy and unreal, he was startled by a jarring of the tree, as though struck with some heavy object.  When it was repeated several times, his senses returned to him, and he raised his head and listened.