“Ready!” called out Frank, promptly, while Andy took a big breath, and gripped the upright beside him nervously.

Both of them had their eyes on the course in front. Frank saw that it was practically clear of people, so that the chances of any trouble were reduced to a minimum. He was glad of this, because if the contestants were recalled to try for another start the strain would be almost unbearable.

He heard Puss answer “all ready, Judge,” after a trifling delay, as though he might have thought of some slight change at the very last second.

Then came a brief period of suspense. Perhaps it was only a few seconds, while the starter glanced to right and left to make sure that everything was as it should be, and the track clear. But to poor Andy it seemed as though the delays were interminable, and that an hour must have elapsed.

He was impelled to turn his head, and see what the Judge could be doing; but remembering the positive instructions given by his cousin, he resolutely shut his jaws, and refrained.

Would the signal never come? Those who were to assist in launching the aerial craft had assumed an attitude of expectancy. Their muscles were set, and they stood ready to give the initial push as the propellers started whirling.

Suddenly the loud voice of the starter rang out, sharp and clear:

Then go!

CHAPTER XXI.
HEADED FOR THE SUMMIT OF OLD THUNDER TOP.

Instantly, as it seemed, there were loud exclamations, accompanied by all signs of bustle and excitement. The engines began to snap, and both aeroplanes started down the slight descent, which had been selected as best suited for their initial forward movement.