That evening the child sat at supper with her father, and she ate from her golden plate, and drank from her golden mug, and she did not even give a thought to the frog down in the fountain.
Presently there came a knocking at the door, but it was so soft that no one heard it but the Princess. Then the knocking came again, and a hoarse voice cried, “King’s daughter, King’s daughter, let me in. Have you forgotten the promise you made me by the fountain?”
The Princess was frightened. She slipped down from her chair, and ran to the door, and opened it and looked out. There on the top-most step sat the great green frog.
When the Princess saw him she shut the door quickly, and came back to the table, and she was very pale.
“Who was that at the door?” asked the King.
“It was no one,” answered the Princess.
“But there was surely someone there,” said the King.
“It was only a great green frog from the fountain,” said the Princess. And then she told her father how she had dropped her ball into the fountain, and how the frog had brought it back to her, and of what she had promised him.
“What you have promised that you must perform,” said the King. “Open the door, my daughter, and let him in.”