"No, Dad, I'm going to row over to Lanton, and, if I can get the ARROW fixed, I'll tow my rowboat back."

"Very well, then you won't be in any danger from Andy Foger. I must speak to his father about him."

"No, dad, don't," exclaimed the young inventor quickly. "I can fight my own battles with Andy. I don't fancy he will bother me again right away."

Tom found it more of a task than he had anticipated to get the motor in shape to run the ARROW back under her own power. The magneto was out of order and the batteries needed renewing, while the spark coil had short-circuited and took considerable time to adjust. But by using some new dry cells, which Mr. Hastings gave him, and cutting out the magneto, or small dynamo which produces the spark that exploded the gasoline in the cylinders, Tom soon had a fine, "fat" hot spark from the auxiliary ignition system. Then, adjusting the timer and throttle on the engine and seeing that the gasoline tank was filled, the lad started up his motor. Mr. Hastings helped him, but after a few turns of the flywheel there were no explosions. Finally, after the carburetor (which is the device where gasoline is mixed with air to produce an explosive mixture) had been adjusted, the motor started off as if it had intended to do so all the while and was only taking its time about it.

"The machine doesn't run as smooth as it ought to," commented Mr. Hastings. "No, it needs a thorough overhauling," agreed the owner of the ARROW. "I'll get at it to-morrow," and with that he swung out into the lake, towing his rowboat after him.

"A motor-boat of my own!" exulted Tom as he twirled the steering wheel and noted how readily the craft answered her helm. "This is great!"

He steered down the lake and then, turning around, went up it a mile or more before heading for his own dock, as he wanted to see how the engine behaved.

"With some changes and adjustments I can make this a speedy boat," thought Tom. "I'll get right at it. I shouldn't wonder if I could make a good showing against Mr. Hastings' new CARLOPA, though his boat's got four cylinders and mine has but two."

The lad was proceeding leisurely along the lakeshore, near his home, with the motor throttled down to test it at low speed, when he heard some one shout. Looking toward the bank, Tom saw a man waving his hands.

"I wonder what he wants?" thought our hero as he put the wheel over to send his craft to shore. He heard a moment later, for the man on the bank cried: