GIOTTO, THE PAINTER. 31 began learning his trade as a shep- herd boy. One day, the little fellow took it into his head to sketch the picture of a sheep that was lying down near him. But how was he to make the sketch ? He had no pen, no pencil, no colors. Necessity is a good school- master, and necessity taught. little Gi- otto what to do. He found a smooth flat stone; and upon this stone, by the help of a small piece of slate, he sketched—very rudely and imperfectly, _to be sure—the picture of the sheep. While he was engaged in this work,