“By Jinks, it does seem to be moving!” he admitted. “Wonder now if that could be only the wind?”

“But, don’t you see, the wind has died out. And, say, that noise sounds for all the world like a dog trying to dig his way through. I tell you, Bluff, they’re coming in after us—the wolves, I mean!”

This time Bluff did not laugh. Instead, he put out a hand and commenced to fumble around him. Jerry knew he was searching for his rifle, and he hastened to take a firmer grip on his own weapon, which he was holding at the time.

The scratching noise continued, with but slight intermissions. They could also see even in that uncertain light that the animal was by degrees demolishing the flimsy shelter at the place where he had attacked it.

Then something that glowed like two coals of yellow fire appeared. Jerry caught his breath, and stared as though fascinated. He knew that those strange objects were the flaming eyes of the bold wolf that thought to steal this march upon them.

The animal had been afraid to enter the shelter on the side where the fire smoldered. Urged on by hunger, he had thought to tear a hole in the wall and attack those within.

Had either of the boys been better versed in the nature and habits of wolves, they must have known that only when half famished would these skulkers of the Canadian forests make bold enough to attack human beings.

Neither of the boys bothered about anything just then save the fact that they were threatened by a savage enemy and had better take immediate measures looking to self-protection.

Jerry felt rather than saw his companion start to raise his gun.

“Oh, Bluff, please don’t!” he cried hurriedly.