CHAPTER IV

THE CONTRACT, AND LIQUID HYDROGEN


"I knew you'd do it," exclaimed Major Honeywell, beaming. "Now
we'll have my friend Senor Oje up and get right at the details."

"One moment, Major Honeywell. It is easy to say what I just told
you. But it means I've got to do something no one has ever done.
I've got to take with me--in the balloon, of course--the material to
replace the gas I lose."

"Well, that's easy, isn't it? For you--" qualified the old soldier.

"I guess you don't know much about ballooning," laughed Ned.

"Will money enable you to do it?"

"I hope so! Other experimenters have tried to carry materials to
make gas. I'm going to take the gas itself in a glass jar."

"In a glass jar!"

"Precisely. Liquefied hydrogen gas."