hero turned on still more power, he easily held his own.
"Aw, you can never beat us!" yelled Pete.
"Of course not!" added Sam.
"I'll leave him behind in a second," prophesied Andy. "Wait until I throw in the other gear," he added to his cronies in a low voice. "He thinks he's going to beat me. I'll let him think so, and then I'll spurt ahead."
The two machines were now racing along side by side. Andy's car was going the limit on third gear, but he still had the fourth gear in reserve. Tom, too, still had a little margin of speed.
Suddenly Andy reached forward and yanked on a lever. There was a grinding of cogs as the fourth gear slipped into place, for Andy did not handle his car skilfully. The effect, however, was at once apparent. The automobile shot forward.
"Now where are you, Tom Swift?" cried Sam.
Tom said nothing. He merely shifted a lever, and got a better spark. He also turned on a little more gasolene and opened the muffler. The quickness with which his motor-cycle shot forward almost threw him from the saddle, but he had a tight grip on the handle bars. He whizzed past the auto, but, as the latter gath-
