Eagerly the boy, encased in the hollow tree, tried to follow his brother with his smarting eyes; but the smoke was growing very dense as well as pungent now, and he could hardly see at all for the tears that blinded him. So, not daring to disobey that last injunction on the part of Bob, whom he was accustomed to minding, he could only press his back into the cleft, to shut out the choking smoke, and count the seconds as they passed. The fire was quickly all around him, and he could feel the fierce heat of the burning leaves. Fear for his own safety was almost entirely lost sight of in his anxiety concerning Bob. What if he had not been able to find a hiding-place after all, and was exposed to the full fury of that scorching blast! The very thought made Sandy feel weak. He groaned in anguish, and, from the very depths of his boyish heart, a prayer went up for the safety of the brother whom he loved so well. Meanwhile, what of Bob, who took his life in his hand, content to feel assured that at the worst Sandy would be saved? When Bob declared so vehemently that there was another hollow tree for him near by he said that of which he was by no means certain. He did this in order that Sandy might not push out from his refuge, and insist on sharing his fate. Of course he still had hopes that he might yet find some friendly shelter from the flames; and, as he rushed along, his eyes sought every tree he passed, hoping thus to discover an opening, into which he might crowd himself, and bid the flames defiance. But the precious seconds were passing, and, as yet, he had found no shelter. Twice had he caught sight of what seemed a chance; but upon rushing up to the tree, his heart beating high with anticipation, it was only to discover that the split was not nearly large enough to allow of the passage of his body, and seconds were too valuable just then to dream of trying to slash at the wood with his sharp hunting knife in the hope of enlarging the opening. Long before he could do this the threatening billow of fire must have reached the spot, and passed over him, so, in despair, he rushed along, his eyes now even scanning the ground for some log behind which he might crawl. "Oh!" cried Bob suddenly, as his glance caught a dark opening in a half-dead tree trunk. It was some little distance from the ground, possibly ten feet or more, but as a few limbs remained on the decayed forest monarch, once blasted by a wind-storm while in its prime, he believed he might readily reach the friendly crevice ere the flames took hold upon his buckskin garments. Bob was almost exhausted from his violent exertions; but he certainly gave no evidence of the fact, to judge from the way in which he ran to that tree and commenced to clamber into the lower branches. Burning leaves were already being swept past him on the breath of the wind, to drop into new magazines of dry tinder, and start additional fires ahead of the main blaze.