About this time Broken Tooth made a discovery and, like the others, it was also accidental. In her cooking operations, pieces of food were continually falling upon the ground or being laid upon it in course of preparation, and they became more or less covered with sand or fine particles of grit, which did not taste good, and, besides, they hurt her teeth. She had no idea of their uncleanliness; it was simply a matter of discomfort. One day she observed a long strip of bark hanging to a tree which had recently blown over, and the idea occurred to her that if she had some pieces of this bright, clean bark on which to place the food, the disagreeable sand might be avoided. She tried to break the bark, but it was too tough and stringy, so she went to the cave and returned with a flake of flint. It happened to have a sharp but very ragged edge, and she found that by drawing the edge back and forth across the grain of the bark and at the same time putting on some pressure, she could cut it rapidly. That evening she surprised Longhead by presenting his supper on a set of clean bark dishes. The man examined them curiously and asked how she had cut them. She produced the flint and demonstrated on one of the plates how it would cut. She had invented, or at least, she had made the first application of the saw. The man examined the flake thoughtfully, and, picking up a piece of stick, tried it on that. He soon sawed it off, and was greatly pleased. To get the staves of his spears and handles of javelins the right length, he had been burning them off in the fire, but now he would use a saw. He soon found that the more numerous and regular the notches the faster the implement would cut, and, as few, if any, of the flakes came off the nodules in this condition, he applied pecking and pressure, and soon had a saw with small and regular serrations or teeth, and found it very useful. Up to this time, all his knives had been made of long flakes with a wrapping of roots at one end to protect the hand, but he had found it difficult to secure many flakes long enough for both blade and handle. One day he had the misfortune to break the shaft of his favorite spear. It had a thin blade which was very long and sharp, and the rawhide strings held it firmly. He attempted to untie the lashings, that he might use the blade for another shaft, but they had become so hard and dry that he could not succeed in untying them. He picked up his saw to cut them, but first began idly to draw it across the shaft. At once he noticed that if cut off at the point where he was sawing, the spear would become a knife with a wooden handle. The operation was quickly completed, and he found the new style of knife much superior to the old. Flakes of this size were much more frequently produced in breaking a nodule with fire and water, and all his knives were thereafter furnished with wooden handles.