forgotten her and was thinking and talking aloud.

"You've paid me back already," she declared, smiling. "Didn't you help pull me out from under the buggy the other day? You may have saved my life. If old Prince had really tried to run away I might have been killed. Please don't be grateful to me. You aren't obliged to be grateful to any one, though, if you must, why, you can thank Tom Curtis. It is his motor boat that is to tow our houseboat and take us on our new adventures. He is a splendid fellow and I know you will like him. I am sure you will get along nicely with him."

"I'll do the best I can to be worth my keep. You won't be sorry you told your friend Mr. Curtis to take me along," he said huskily.

"It may not be easy for you all the time," added Madge, feeling that she ought to give David some good advice. "There will be four or five young men on board the motor boat, and they may all ask you to wait on them. But I must not preach. I am dreadfully afraid I shall never be able to get on with your cousin, Miss Taylor. You must tell me how to manage her; because, if she and I were to quarrel, it would spoil the whole houseboat trip. I have a very bad temper. I must go back to the house now. Phil and Miss Betsey will wonder what has become of me. But where are those children?" Madge sprang to her feet. The twins had been before her eyes only a few seconds before. Now they had completely disappeared!

David ran toward the barn. Madge searched the yard frantically. The children had not returned to the house.

CHAPTER IV

THE SEARCH