"Then keep quiet."

"How did you escape from the cave?"

"That is our business, Dr. Mackey. Will you submit, or not?"

"I suppose I'll have to submit. You are three to one." Columbus Washington was now beside Ben.

"Columbus, see if you can find a rope or a strap. We'll bind his hands behind him," went on Jack.

"What are you going to do with me?" questioned the surgeon anxiously.

"Put you where you deserve to be—behind the bars," was our hero's quiet, but firm, answer.

[ CHAPTER XXXI. ]

FATHER AND SON—CONCLUSION.

"Jack, do you mean to say you would put your own father in prison?" asked Dr. Mackey reproachfully, after Old Ben had tied his hands behind him.