Jerry shook his head.

“It would be too risky,” the tall lad decided. “He might draw a gun, and fire at the gas bag, or something. Besides it would mean an extra person on board, and if we rescue Mr. Jackson and his friend and crew, we’re going to be pretty well crowded as it is. I dare not chance it.”

Gloom settled on Ned’s face. Bob did not know what to do. Jerry was at a loss. Professor Snodgrass seemingly had put all thoughts of trouble out of his mind, and was poring over his note-books. Suddenly, however, the little scientist looked up, and, addressing Mr. Morton, asked:

“Couldn’t we give a bond of indemnity for double the amount of the damages—say for two thousand dollars? If we did that, guaranteeing the payment to Mr. Muggins of his claim when it was properly proved, couldn’t we be allowed to go?”

“Yes, that might be done,” admitted the deputy. “I am authorized to accept a good bond. But who would give it?”

“I would,” said Mr. Snodgrass eagerly. Hope showed on the faces of the motor boys. But the sheriff’s man shook his head.

“I don’t know you. You’re a stranger to me,” he declared. “I don’t know whether you’re good for the bond or not.”

“But I tell you that I am, and these boys know it,” said the scientist innocently.

“That won’t do,” declared the officer.

“How about my bond?” suddenly asked Mr. Durkin. “You know me. I’ll sign the bond for two thousand dollars so these boys can go to the rescue. Will you take it?”