"A CASTLE!" exulted the Goat Girl, putting one hand above her heart. "Oh! I've always wanted to see a castle and now I AM." And this castle, let me tell you, was well worth anyone's seeing, a castle of lacy blue marble carved, and decorated with precious stones, in a way to astonish the eyes of a simple mountain lass. From the tallest tower, a silken pennant floated lazily in the evening breeze. "K-E-R-E-T-A-R-I-A," Mandy spelled out slowly. Sliding off the heap of flower petals she stood for a long delicious moment lost in admiration. Then, giving herself a businesslike shake to be sure she was not broken or bent by her amazing flight and tumble, Mandy turned to examine the rest of her surroundings. When she looked at the spot on which she had fallen the stack of blue petals had disappeared, but there, twinkling up cheerfully, was the blue flower as much at home as if it had grown there in the first place. Thoroughly puzzled, Mandy picked the little flower a second time and slipped it into the pocket of her apron. Even without the mystery of the blue flower it was astonishing enough to find herself in the stately park of this gorgeous blue castle. There was a tree lined avenue and velvety lawns splashed with star shaped flower beds stretched in every direction. Only the small patch of land on which she was standing was bare and uncultivated. And evidently someone was at work here, for a great white ox, with golden horns, yoked to a gold plow stood with his back to Mandy, dozing cozily in the pleasant dusk. At sight of the ox, Mandy gave a little sigh of relief and content. Long ago an old mountain woman had given her this sensible piece of advice. "When you do not know what to do next, do the first useful piece of work that comes to hand." Now here, right at hand, was a useful piece of work, and while she was trying to figure out the whole puzzle of the flying rock and strange blue flower, she might just as well be ploughing. Then when the owner of the castle saw her working so industriously, he might invite her to supper. So, grasping the tail of the ancient plow, Mandy clicked her tongue in a cheerful signal for the ox to start.