But this man in the valley was young and very strong, with tissues to be renewed, and the physical man within him clamored and demanded. He must eat. He ran forward and around, anxiously observant, and soon learned that at the western end of the valley, where the little creek tumbled through a rocky cut into a lower level, there was easy exit from the fire-encompassed and protected area. He clambered along the creek's rough, descending side. He emerged upon an easier slope and then found it possible to climb the hillside to the plane of the great wood. There must, he thought, be food of some sort, even for a man with only Oak's knife in his possession! There was the forest and there were nuts. He was in the forest soon, among the gray-trunked, black-mottled beeches and the rough brown oaks. He found something of what he sought, the nuts lying under shed leaves, though the supply was scant. But nuts, to the cave man, made moderately good food, supplying a part of the sustenance he required, and Ab ate of what he could find and arose from the devouring search and looked about him. He was weaponless, save for the knife, and a flint knife was but a thing for closest struggle. He longed now for his ax and spear and the strong bow which could hurt so at a distance. But there was one sort of weapon to be had. There was the club. He wandered about among the tops of fallen trees and wrenched at their dried limbs, and finally tore one away and broke off, later, with a prying leverage, what made a rough but available club for a cave man's purposes. It was much better than nothing. Then began a steady trot toward what should be fair life again. There were vague paths through the forest made by wild beasts. As he moved the man thought deeply. He thought of the fire-wall, and could not with all his reasoning determine upon the cause of its existence, and so abandoned the subject as a thing, the nub of which was unreachable. That was the freshest object in his mind and the first to be mentally disposed of. But there were other subjects which came in swift succession. As he went along with a dog's gait he was not in much terror, practically weaponless as he was. His eye was good and he was going through the forest in the daylight. He was strong enough, club in hand, to meet the minor beasts. As for the others, if any of them appeared, there were the trees, and he could climb. So, as he trotted he could afford to think. And he thought much that day, this perplexed man, our grandfather with so many "greats" before the word. He had nothing to divert him even in the selection of the course toward his cave. He noted not where the sun stood, nor in what direction the tiny head-waters of the rivulets took their course, nor how the moss grew on the trees. He traveled in the wood by instinct, by some almost unexplainable gift which comes to the thing of the woods. The wolf has it; the Indian has it; sometimes the white man of to-day has it.