Hardly had he spoken than there came a shout from below, and the balloon rose swiftly in the air.

“They’re making an early flight!” cried Bob. “We missed ’em.”

“Oh, we can see from here just as well,” said Jerry, as he checked the downward progress of the Comet for a moment.

Upward shot the big dirigible, amid the cheers of the onlookers, and then, wishing to make as good a landing as possible, and needing good speed and control to effect this, Jerry again sent the motor-ship downward.

A little later the motor boys landed in the midst of a big, green, open space, while the crowd thronged up around them, cheering their impromptu exhibition, and asking all sorts of questions.

“Here at last!” cried Ned, with a sigh of relief. “Now to find Mr. Jackson.”

Overhead the big dirigible was shooting forward through space, for her propellers had been set in motion. The boys watched her with great interest, little knowing how their own fate was interwoven in that of the strange craft.


[CHAPTER XX]
MR. JACKSON IS GONE