“Unless we can get that valve open.”
“And if we can’t?”
“Then we must drift higher and higher till we perish of cold, or the bag explodes and we are precipitated to the earth.”
CHAPTER XX.
“ALL OUR LIVES DEPEND ON IT.”
Nat staggered toward the door of the pilot-house. Mr. Tubbs, at the wheel, the least affected of the adventurers, turned his head.
“What are you doing to do?” he demanded.
“Get that valve open,” was the brief reply.
“Boy, you are crazy!”
“Maybe, but I’m going to make a try for it, anyhow. All our lives depend upon it.”