He knew when Bruin had managed to drag his entire bulk out from the enclosure, for the scene was by this time as well lighted up as though the sun shone through the eddying smoke clouds, only it was a red, angry glare, peculiarly terrifying. Yes, thank goodness, the beast was scurrying down the trunk of the old tree as fast as he possibly could. Fright urged him on, and Bob could not help adding to the situation by giving a shrill whoop. "Thank you, sir; with your leave I will tumble into your late berth," he exclaimed, as he struggled to pass around the stump again, in order to reach the opening. Short as was the time consumed in doing this, when he reached the gap in the trunk the bear had already tumbled to the ground. Bob heard the beast give utterance to a subdued roar, as though some of the flying leaves that were afire might have alighted on his hairy hide; then the black beast galloped madly off, heading in a direct line away from the approaching fire. But well did Bob know that, unless Bruin had some near-by cave in mind when he thus scampered off, the chances were ten to one he would roast in the conflagration, since he could never hope to outstrip its onward rush. Bob did not stop to see anything more just then. The air was already scorching, the smoke blinding, and there was danger lest his garments take fire unless he speedily dropped out of reach of the flying leaves. Of course there was only one way in which to properly enter that hole in the old tree trunk. That was feet first, just as the original proprietor of the den had been in the habit of doing. Regardless of almost everything else save the fact that he was in a tremendous hurry, the boy pushed his figure through the aperture. Since there was nothing to which he could apply his moccasined toes, in order to stay his downward movement, the consequence of haste was that Bob took a quick passage to the very bottom of the tree trunk. Beyond a few minor scratches, however, he did not think that he had received any hurt, and such trifles were not to be considered, when he had such a serious problem at stake as saving his life. Looking upward he could see the opening, for through it glowed the light of the conflagration. From this he was able to judge that the aperture must be some five feet above his head. There was ample room in the stump's interior for the boy to move around, and, on the whole, he did not doubt but that it had formed quite a pleasant den in which a bear could hibernate through the long winter. Already could he hear the roar of the flames all around him. Really, the sound was rather terrifying, though he knew full well it would be quickly over. At least there was now no fear of the bear returning. That possibility had worried Bob for a brief period, since it would be very inconvenient to have had the singed animal dropping down upon him in that confined space.