had lasted several days.
"Splendid work, boys, splendid work!" Anderson Rover had said. "I am proud of you!"
"Better work than the authorities could do," had come from Uncle Randolph.
"Now that treasure had better be placed where no outsider can get his hands on it," Mr. Rover had added. And soon after that it was put in the strong box of a safe deposit company, there to remain until it could be properly invested.
At Brill College the Rover boys had fallen in with a number of fine fellows, including Stanley Browne and a German-American student named Max Spangler. They had also encountered some others, among whom were Dudd Flockley, Jerry Koswell and Bart Larkspur. Led by Koswell, who was a thoroughly bad egg, the three last-named students had tried to get the Rover boys into trouble, and had succeeded. But they overreached themselves and were exposed, and in sheer fright Koswell and Larkspur ran away and refused to return. Dudd Flockley was repentant and was given another chance.
While on the hunt for Mrs. Stanhope, the Rovers had fallen in with Koswell and Larkspur. But instead of getting aid from the pair, the latter did what they could to help old Crabtree and Sobber. This brought on a fight, and Koswell and Larkspur received a thrashing they would long remember. The former college students might have been arrested, but, like Crabtree and Sobber, they kept out of sight.
"They are sure a bunch of bad ones," had been Dick Rover's comment, when referring to Crabtree, Sobber, Koswell and Larkspur. "I wish they were all in jail."
"I reckon we all wish that," had been Sam Rover's reply. "It's an awful shame that we didn't capture at least one of 'em."
"Well, we might have caught old Crabtree and Sobber if we hadn't broken the engine of the motor-boat," put in Tom.
"Well, the engine was broken in a good cause," came from Dick. And he spoke the truth, as my old readers well know.
Following the home-coming of the boys, and the general jubilee, our heroes had settled down to enjoy themselves before going back to Brill. They had intended to take it easy on the farm, but when a great aviation meet was advertised to take place at the county seat they could not resist the temptation to be present.
At this meet there were five flying machines,--three biplanes, a monoplane, and a dirigible balloon. All made good records, and the Rover boys became wildly enthusiastic over what they saw.
"Say, this suits me right down to the ground!" cried Tom.
"What fun a fellow could have if he had a flying machine and knew how to run it!" had come from Sam.
"Exactly--if he knew how to run it," had been Dick's words. "But if he didn't know--well, he might have a nasty tumble, that's all."
"Pooh, Dick! If those fellows can run these machines, so can we," had been Tom's confident words.
"We know all about autos and motor-boats," Sam had put in.
"That's true, Sam. But a monoplane or a biplane, or any kind of an aeroplane, isn't an auto or a motor-boat."
"Are you afraid?" demanded Tom.
"Oh, no! Only if we got a flying machine we'd have to be careful about what we tried to do."
"Hurrah! It's settled!" cried Tom, who went headlong into everything. "We'll get a machine to-morrow! How much do they cost?"
"I don't know--several thousand dollars, I fancy," answered his elder brother.
"Boiled umbrellas, Dick! As much as that?"
"I think so."
"Why look at some of 'em," declared Sam. "Nothing but bamboo poles and a few wires, and canvas,--and the engine!"
"Yes, but the poles, wires and canvas have to be put together just right, Sam, and those engines are as powerful as they are light. And then don't forget the propellers, and the steering outfit, and the other things."
"Come on and ask one of the men about them," came from Tom; and a little later they had a long talk with an aviator named Captain Colby, who proved to be a relative to Larry Colby, one of their former chums at Putnam Hall. He had heard about the Rover boys and some of their doings, and willingly told them all they wanted to know.
The boys went home with their minds full of flying machines, and as the Rovers were all well-to-do, and as the three lads had in the past proved capable of taking care of themselves, it was not a very difficult matter for them to persuade their father to let them buy a biplane. Then, through Captain Colby, they learned where the flying machine could be obtained, and the very next day bought the affair and had it shipped to the farm, and also arranged with the aviator to visit them and give them a number of lessons.
"We've got three weeks before we have to go back to

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