But the warning came too late. There was an ominous cracking and splintering, and then with a roar a section of the roof collapsed, carrying the boys down with it.

[CHAPTER III—AN AMAZING DISCOVERY]

There was a chorus of shouts as the boys felt themselves falling, followed by a heavy thud as they brought up on the floor of the attic in a blinding cloud of dust and plaster.

They had been so close together that they all came down in a heap, in a waving confusion of arms and legs.

Fortunately the distance had been only a few feet, but it was enough to knock the breath out of them, especially out of Jimmy, who had the misfortune of finding himself at the bottom of the heap.

For a minute or two they were too dazed by the suddenness of the fall to speak coherently, or in fact to speak at all. Then gradually they disentangled themselves and got to their feet.

Their first sensation had been that of alarm and the second of shock. But after they had in some measure recovered from these, there came a third sensation of immense relief.

For what had seemed at first a disaster revealed itself as a blessing in disguise when they realized that at least they had escaped from their pursuer. They were inside the house and had a number of ways of escape through the doors or windows available to them. The tables had been turned, and now it was the bear that was at a disadvantage.

They rubbed their eyes to get the dust out of them, and had barely begun to see clearly when they heard a voice calling from outside the house. The accents were foreign and they could not catch clearly what was said, but the words, whatever they were, were promptly followed by a scratching and clawing that seemed to indicate that the bear was sliding down one of the pillars of the porch to the ground.

“We must warn him!” cried Bob. “The bear will get him, sure!”