"I'll tell them all--the first chance I get," promised Dave. "And I am sure they will be pleased. Why, Nat, I know you can turn over a new leaf, if you want to. Look at Gus Plum, how mean he used to be, and what a bully! And look at him now. He's a first-rate fellow. You can do it if Plum can, can't you?" "I'm going to try, anyway." "And I'll help you all I can--and there's my hand on it," answered Dave, and then the two lads shook hands. A talk lasting all the way to Crumville followed. As they rolled into the station Nat left rather hastily, going to the rear of the car, while Dave went forward. The money-lender's son knew Dave expected to meet his sister and friends and he did not, just then, wish to face the party. "There's Dave!" cried Jessie Wadsworth, as she caught sight of him through a car window. "Hello, everybody!" cried the youth, as he swung himself from the car steps. He gave Jessie's hand a tight squeeze and then kissed his sister. "How are you?" "Oh, fine!" came from both girls. "Hello, Davy!" cried a merry voice, and Dunston Porter, the lad's uncle, came striding forward from an automobile near by. "How did you leave Senator Morr and his family, and are you ready for that trip through Yellowstone Park?" "I left the senator and his family well," was the answer. "And I am ready for the trip--that is--part of the trip," Dave added, hastily. "Part of the trip?" cried Jessie. "Why, what do you mean?" "I'll tell you later. Oh, I've got lots and lots to tell," went on Dave, with a smile. He caught Laura and Jessie by the arms. "See Nat Poole over yonder?" he whispered. "Well, you want to be nice to Nat after this, for he is going to reform." "Reform?" queried his sister. "Really?" added Jessie. "That's what he told me. We had quite a talk on the train. I'll tell you about it later. And I've got a lot more to tell," Dave went on. "All about a lost gold mine that belongs to Mrs. Morr, Roger's mother." "A lost gold mine!" exclaimed Dunston Porter. "Is this a joke, Dave?" "No, sir, it's the truth. The strangest tale you ever heard. When we go out to Yellowstone Park we--that is, us boys--are going to look for the mine." "Of all things!" burst out Laura. "Say, Dave, will you ever settle down? Here I thought you were going to take a nice little personally-conducted tour with us, and you talk of going land knows where to look for a lost gold mine!" "Is it very far?" asked Jessie, and her face showed some disappointment. "Oh, it's not very far from Yellowstone Park," answered the youth. "It's in Montana, and you know a corner of the Park is in that State."