"That's the trouble with these contraptions," he said. "Always out of whack. If a man had a good horse now—"
He broke off and continued to mumble something unintelligible to himself.
"I've found it," cried Hal now, from the aeroplane. "I was working on the wrong part. I'll have it fixed in a jiffy."
Chester made no reply, but Stubbs brightened up wonderfully.
"That's the talk!" he cried. "Fix her up, Hal, and get a move on."
Hal smiled to himself as he tinkered with the engine.
Hal was deep in his work when his attention was attracted by a sudden cry of alarm from Stubbs.
"Germans!" cried the little man, and without stopping to look again, he dashed toward Hal.
At almost the same moment Chester saw a force of the enemy advancing toward him. He, too, uttered a cry of alarm and dashed toward the place where Hal still bent over the aeroplane.
Stubbs danced up and down and chanted excitedly: