Many men and women of the tribe had closed their eyes in the long sleep, but when the Cave People slumbered, the dead came back again, to journey and hunt the forests with their brothers and sisters. And so, in time, the Cave People came to believe that their friends, who had deserted the body, still lived. That they had, themselves, fought and hunted while their bodies slept, the Cave People well knew, and that the dead come back again, they knew also, for they had seen and spoken with them in their dream journeyings. This was the origin of the idea of spirit, at first only dim and confused but gathering strength as the years rolled away. The seed of the idea of immortality sprang also from the dreams of primitive man. Though the sabre-toothed tiger devoured a brother he would surely return again. They had seen these things with their own eyes, in dreams. The Cave People saw also their shadows that followed where they went, moving slowly when they walked, and swiftly when they ran, keeping ever at their sides. When a Cave Man gazed into the river, always a face looked back at him, and the other members of the tribe told him he saw his own image. This also was very strange. If he journeyed as far as the great canyon, and sent his voice echoing among the big rocks, a call came bounding back to him, although there was no other man there. Gradually he came to believe the cry was the voice of a spirit and that the face he had seen in the waters of the river was the face of a spirit also. To all things the Cave People attributed animation. To them everything was alive. Young trees were the children of big trees and great stones were the fathers of small stones. Little they spoke of these things, for their words were few and it is impossible to tell many things in a gesture language. Danger and confusion they saw everywhere, for the whole world was filled with happenings they could not understand. Many seasons had passed since they had found the Fire beast eating up the trees in the woods. The small blaze they had kept alive in the Hollow had died long before, when Quack Quack forgot to feed it. In these days the Fire flashed only through the heavens during a storm. Strong Arm had been able to call it by striking a sharp stone against the rock before his cave. When the darkness came on and he struck the rock swiftly, a small spark fell. Again and again the Cave People saw these sparks. But so quickly were they gone that no man or woman was able to catch them, or to feed them the dead leaves they had brought. At this time Big Nose made a great discovery. He had chased a fat lizard over the rocks and had seen it disappear into the hollow of a tree that lay prone on the river bank. Immediately he poked violently with a long rod of bamboo, in order to drive the lizard out. To him the fresh flesh of the lizard was sweeter than any other meat.