into the hole in the spool (Fig. 118). The rubber-band ends must project an equal distance beyond the spool-ends. Before fastening the spool to the tin mold shell, tie the end of a piece of heavy linen thread to its center, and then wind about twenty turns about it. Pierce a hole through each side of the mold a trifle in front of the center, and after slipping pieces of string through the ends of the rubber-bands (Fig. 118), tie them through the holes pierced through the sides of the mold. Pierce a hole through the shell, directly over the center of the spool, slip the free end of the thread wound on the spool through this hole, and tie it to a fancy-work ring (Fig. 117).
To Make the Turtle Crawl, place it upon the floor, pull on the ring, and as the thread unwinds from the spool the rubber-bands will twist; then slacken the thread, and the turtle will crawl along the floor. As the rubber-bands untwist, the thread will wind up on the spool again. Continue pulling and slackening the thread alternately, and the turtle will continue to crawl.