Sure enough the cylinder was slowly rising in the air, bearing the weight with it. It had lifted it clear from the ground and was approaching the roof of the big shed.

“It will work! It will work!” exclaimed the professor, strangely excited.

The next instant the cylinder, carrying the weight, sailed right out of an open skylight, and began drifting outside the shop, and across the fields.

“Quick! We must get it back!” cried Mr. Henderson. “If it gets away my secret may be discovered and I will lose all! We must secure it!”

But the cylinder was now two hundred feet in the air and being blown to the east, the weight dangling below it, making it look like a miniature airship.

“We can never catch that!” cried Mark.

CHAPTER III
WASHINGTON DECIDES

“We must catch that cylinder!” the professor exclaimed. “Some one may find it when it comes down and analyze the gas. Then he would discover how to make it. The cylinder must come down!”

“Don’t see how we can proximate ourselves inter th’ vicinity of it lessen we delegate th’ imperial functions of ornithological specimens t’ some member of this here party,” observed Washington.

“If you mean we can’t catch that there contraption unless we turn into birds I’ll show you that you’re mistaken!” cried Andy Sudds. “I guess I have a trick or two up my sleeve,” and the old hunter quickly threw open the breech of his gun and inserted a couple of cartridges.