Frank sprang toward the prisoner with flashing eyes. "I'll show you what such sneaks get here."

Ned drew the enraged boy away.

"He'll get what's coming to him at some other time," he said. "Let him alone for the present."

"But he did attempt to cut the hose!" Jack exclaimed. "We ought to throw him out to the sharks."

"Not now," said Ned, coolly.

"Anyway," Frank said, a smile showing on his face, "he made us swim to the boat."

"He did that himself," laughed Jimmie, "and lost his weights."

"That's the worst of it," Jack remarked, "we've lost our weights, and there's no knowing how we are to get more."

Jimmie now pointed to the air machine.

"Was there something wrong with it?" he asked.