When the Cave-men noticed that Chipper never lost his shaft they began to make loose shafts. And they got the idea of a barbed spearhead from a wound which was made by a broken point. They found such a point deep down in the wound of a bison. The sharp edge had caught in the bison's flesh. And every movement of the bison had driven the spearhead deeper. [Illustration: _A harpoon._] It was by paying attention to such little things that the Cave-men learned to make barbed spears. When the Cave-men learned that barbed spearheads made very dangerous wounds, they were willing to take the trouble of making the barbed points. But no Cave-man was willing to lose one of his barbed spear points. Perhaps that is why the men began to tie the barbed heads to the loose shaft. When they first did this, they did not know that their spears had become harpoons. #THINGS TO DO# _Find a hollow reed and use it for a shaft. Make a shaft with a socket in it. Fit a spearhead into the socket. Change the spear so as to make a harpoon._ _Draw a picture of the chase of the wild horses._ _Think of a wild horse running very fast. See if you can model a wild horse in clay so as to show that it has great speed._ XXII THINGS TO THINK ABOUT Why was the harpoon a better weapon for hunting than the spear or javelin? What could hunters do to keep smooth shafts from slipping from their hands? What is the harpoon used for to-day? Why do animals become more cunning after they are hunted? _How the Cave-men Hunted with Harpoons_ Once again the Cave-men went out to hunt the wild horses. Once again they took new weapons. But instead of spears and javelins they carried barbed harpoons. From a high hill they saw the horses on the edge of a grassy upland. They hurried over the wooded hills and crept through the tall grass. When Bighorn gave the signal the sentinels pricked up their ears. But before they could give the alarm, the men had thrown their harpoons. The frightened horses crowded upon one another. Snapping sounds of breaking shafts, sharp cries of wounded horses, and loud shouts of Cave-men added to their terror. The snorting of the sentinels warned the Cave-men back. A signal from the leader brought order to the herd. It began to move as though it were one solid mass. Away the herd galloped, striking terror to all creatures in the way. But the wounded horses soon lagged. In vain they tried to keep up. At each step the shaft of the harpoon swung under their feet. At each step the barbed head pierced deeper and deeper. So the Cave-men had little trouble in finishing the chase. Perhaps you think the Cave-men had no trouble in hunting after that. They had less trouble for some time, and they all prized their harpoons. But on cold days, when their hands were stiff, the smooth shafts slipped from their grasp.