"Good!" said the lieutenant. "Now you had better turn in and get some sleep. You must be tired out."
"Sleep!" ejaculated Jack. "I couldn't sleep now."
"No, I suppose you couldn't," replied the lieutenant thoughtfully. He was silent for some moments. "I'll tell you what I'll do," he said finally, "we have come to the surface again I'll ask Captain Von Cromp to allow you to go upon the bridge, if you wish. He realizes your feelings as well as I do, in spite of his apparent gruffness. The cool air will do you good."
"If you will be so kind, I am sure we shall appreciate it," said
Frank.
The lieutenant left the cabin. Frank, espying something at one end of the room, walked over to investigate. He came back to Jack, holding something gingerly in his hand.
"By Jove!" he exclaimed.
"What is it?" asked Jack.
Frank held the object up before his friend's eyes.
"Look at it!" he exclaimed. "Do you know what it is?"
Jack took a long look and then stepped suddenly back, exclaiming: