One fine evening a young princess went into a wood and sat down by the side of a cool spring of water. She had a golden ball in her hand, which was her favorite plaything, and she amused herself with tossing it into the air and catching it again as it fell. After a time she threw it up so high that when she stretched out her hand to catch it, the ball bounded away and rolled along upon the ground, till at last it fell into the spring. The princess looked into the spring after her ball; but it was very deep, so deep that she could not see the bottom of it. Then she began to lament her loss, and said, "Alas! if I could only get my ball again, I would give all my fine clothes and jewels, and everything that I have in the world." While she was speaking a frog put its head out of the water and said, "Princess, why do you weep so bitterly?" "Alas!" said she, "what can you do for me, you nasty frog? My golden ball has fallen into the spring." The frog said, "I want not your pearls and jewels and fine clothes; but if you will love me and let me live with you, and eat from your little golden plate, and sleep upon your little bed, I will bring you your ball again." "What nonsense," thought the princess, "this silly frog is talking! He can never get out of the well: however, he may be able to get my ball for me; and therefore I will promise him what he asks." So she said to the frog, "Well, if you will bring me my ball, I promise to do all you require." Then the frog put his head down, and dived deep under the water; and after a little while he came up again with the ball in his mouth, and threw it on the ground. As soon as the young princess saw her ball, she ran to pick it up, and was so overjoyed to have it in her hand again, that she never thought of the frog, but ran home with it as fast as she could. The frog called after her, "Stay, princess, and take me with you as you promised;" but she did not stop to hear a word. The next day, just as the princess had sat down to dinner, she heard a strange noise, tap-tap, as if somebody was coming up the marble staircase; and soon afterwards something knocked gently at the door, and said: "Open the door, my princess dear, Open the door to thy true love here! And mind the words that thou and I said, By the fountain cool in the greenwood shade." Then the princess ran to the door and opened it, and there she saw the frog, whom she had quite forgotten; she was terribly frightened, and shutting the door as fast as she could, came back to her seat. The king her father asked her what had frightened her. "There is a nasty frog," said she, "at the door, who lifted my ball out of the spring last evening: I promised him that he should live with me here, thinking that he could never get out of the spring; but there he is at the door and wants to come in!" While she was speaking, the frog knocked again at the door, and said: