It was only when the knight began to speak of the wood that the fisherman grew restless and refused to listen.
'It were wiser, Sir Knight,' he said, 'not to talk of the wood at nightfall, or indeed to say much of it at any time.'
And then the old couple told their guest how simply they lived in the little cottage by the lake, and they in their turn listened eagerly while the knight told them of himself. He was named Sir Huldbrand, and he dwelt in his castle of Ringstetten, which stood near the source of the river Danube.
Now, as he talked or listened to the quiet tales of the old fisherman, the knight heard a strange sound that seemed to come from the direction of the window. Again and again it came, a strange sound as of water being dashed against the window-panes.
It was plain that the fisherman heard it too, for at each splash a frown crossed his good-natured face.
A louder splash, and a shower of water streamed through the loosely built window-frame into the kitchen.
Then the old man could sit still no longer. He hastened to the window, and opening it called out in an angry voice, 'Undine, cease these childish tricks. A stranger, and he a knight, is in our cottage.'
A low laugh answered him. Hearing it, the old man shut the window and sat down again, saying to his guest, 'Sir Knight, forgive this rude behaviour. Undine my foster-daughter is still only a child, although she is now nearly eighteen years of age. Yet her tricks are harmless, and she herself is full of kindness.'
'Ah,' said the old woman to her husband, 'to you, who are not with her save when the day's work is over, her pranks may seem harmless. But you would not talk so lightly of her ways were she by your side all day. Ever I must watch her, lest she spoil my baking, or undo my spinning or burn the soup. Nay--'
'It is true,' said the old man, interrupting his wife with a smile, 'it is true that you have the maiden by your side throughout the livelong day, while I have but the sea. Yet when the sea is rough and breaks down my dykes I do not love it the less. Even so do you love the little one no less for all her tricks and tiresome ways.'
The old woman turned to her guest. 'Indeed, Sir Knight, he speaks truly. It is not possible to be angry with the maiden long.'