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98 and during that time gave the Rover bays as much instruction as possible in the art of flying in general and the art of managing the biplane in particular. He had brought with him several books on flying and recommended that these be read carefully.

"You all seem to take to it naturally," he said. "I don't believe you'll have any trouble excepting on rare occasions—and every person who goes up is bound to have that."

After the captain left the boys took several flights, some of them quite long. They sailed over Dexter's Corners and the railroad station of Oak Run, and at the latter place nearly scared old Ricks, the stationmaster, into a fit, by swooping down close to where he was standing. Dick also made a flight to the Marley place, and visited the Snubble homestead.

"What did you find out?" asked Sam, when he came back from the last-named trip.

"Sobber and Crabtree have left the old mill," answered Dick. "The Snubble boys were over there twice and they couldn't see a sign of anybody."

"Have they any idea where they went to?" asked Tom.

"No. They said Crabtree sold the mill property."