The saw thus became one of the most useful of his few tools. Thus the flint saw, discovered by accident by a primitive woman, was the germ from which has been elaborated, with little change except for material, one of the most useful tools known to civilized man. When the little cave-boy of their family was something over a year old, a small girl was brought by the spirits, and as the children grew and thrived, Broken Tooth began to suggest that their present home was becoming crowded. The cave was indeed a small one for two, three made it uncomfortable, and now four was certainly a crowd. Longhead first proposed searching for a cave of larger proportions, but to this Broken Tooth raised several objections. All the larger caves in the vicinity were already occupied, and, while they might no doubt use the authority of the spirits to compel the present occupants to vacate a cave for their use, this course was sure to create ill feeling which, sooner or later, might work to their disadvantage; and, besides, where could they find one with so large a platform in front and so well protected by overhanging rock. Could not some plan be devised to enlarge this one? and she called Longhead's attention to the fact that the rock inside was soft and friable, and that small pieces were continually falling down, which she carried out and threw over the edges of the platform. The man undertook to make the cavity larger by pulling down and removing all the loose pieces, but, when this was done, little increase in the size of their home was apparent. On one side the man noticed that the rock was full of small cracks and seams, but these were so tightly fitted and irregular that he could remove but few of the stones with his hands. One piece that was quite loose he tried for a long time to pull out, but it pinched too tightly at one corner. In a rage, he picked up a large, sharp cornered piece of flint with both hands and struck it with all his might into the crack which held the tightest. The piece that bound it was broken and the stone fell out, followed by a number of others. Another discovery of the value of flint pieces had been made--a pick had been found, and daily both Longhead and Broken Tooth spent some hours digging at the loosened rocks until, in the course of time, they had a cave sufficiently large for their needs, and in succeeding years this was extended, as the growth of the family and their ideas of comfort demanded. By the same means Longhead removed the irregularities of the floor and side walls, and finally he somewhat enlarged the doorway, gave it a more regular shape, and substituted strong wooden bars, held in place by notches cut in the stone, for the large stones they had formerly rolled into the opening at night to prevent the entrance of dangerous animals. The curious inhabitants of the settlement watched these operations, and it was not long until many other caves were thus enlarged and more comfort secured.