“Chase him in my new flying machine. Heard of it?”

“Yes. The papers mentioned that you had such an invention.”

“My interest in the case is excited. Do you want to do it?”

“I’d be delighted, if you’ll allow me to.”

“Oh, I want a use to put the engine of the clouds to, and as this is a good one I’ll see if I can’t aid the ends of justice with the machine.”

“Good! When shall we start?”

“The day after to-morrow. As we can make one hundred miles an hour through the sky in her, we are bound to soon overhaul the steamer. We have only to provision and equip the engine now.”

The four set to work at once on the airship.

By the second day she was ready, and they all embarked.

Frank entered the forward turret, the machinery was started, the helices whirled, and the engine arose and passed through the open roof of the shop and shot up into the sky.