They were too late, the hardy people who came up to assail the serpent, because the serpent had not waited for them. The two boys roosting in the treetop on the height had beheld what was not pleasant to look upon, for they had seen a yearling of the aurochs enveloped by the thing, which whipped down suddenly from the branches, and the crushed quadruped had been swallowed in the serpent's way. But the dinner which might suffice it for weeks had not, in all entirety, the effect upon it which would follow the swallowing of a wild deer by its degenerate descendants of the Amazonian or Indian forests. The serpent did not lie a listless mass, helplessly digesting the product of the tragedy upon the spot of its occurrence, but crawled away slowly through the reeds, and instinctively to the water, into which it slid with scarce a splash, and then went drifting lazily away upon the current toward the sea. It had been years since one of these big water serpents had invaded the river at such a distance from its mouth and never came another up so far. There were causes promoting rapidly the extinction of their dreadful kind. Three or four days were required before Ab and Oak realized, after what had taken place, that there were in the community any more important personages than they, and that they had work before them, if they were to continue in their glorious career. When everyday matters finally asserted themselves, there was their pit not yet completed. Because of their absence, a greater aggregation of beasts was feeding in the little valley. Not only the aurochs, the ancient bison, the urus, the progenitor of the horned cattle of to-day, wild horse and great elk and reindeer were seen within short distances from each other, but the big, hairy rhinoceros of the time was crossing the valley again and rioting in its herbage or wallowing in the pools where the valley dipped downward to the marsh. The mammoth with its young had swung clumsily across the area of rich feed, and, lurking in its train, eyeing hungrily and bloodthirstily the mammoth's calf, had crept the great cave tiger. The monster cave bear had shambled through the high grass, seeking some small food in default of that which might follow the conquest of a beast of size. The uncomely hyenas had gone slinking here and there and had found something worthy their foul appetite. All this change had come because the two boys, being boys and full of importance, had neglected their undertaking for about a week and had talked each in his own home with an air intended to be imposing, and had met each other with much dignity of bearing, at their favorite perching-place in the treetop on the hillside. When there came to them finally a consciousness that, to remain people of magnitude in the world, they must continue to do something, they went to work bravely. The change which had come upon the valley in their brief absence tended