"Well, I'm just as well content with things as they are," commented Harry, "in fact it would not grieve me much to hear that his old balloon had tumbled into the ocean, crew and all."

Supper was soon despatched that evening, and the boys turned in early. They slept soundly, but toward midnight Frank had a queer dream. It seemed to him that he was on board the rat ship once more and that scores of the rodents they had battled with were again overwhelming him. He battled bravely with the hosts but they were too many for him. Just as it seemed that all was over, however, he heard a voice say, "Hold on there!"

So startlingly clear was the voice that Frank awoke as it uttered the words and almost gave a cry, which he instantly checked, as he perceived that it was no dream-voice he had heard.

As he listened intently he heard the voice once more.

"Hold on there—this is it."

The words seemed to come from overhead.

Gazing upward, the boy saw, hovering between the deck of the galleon and the stars, a large black object.

He instantly knew it for what it was.

Luther Barr's air-ship!

CHAPTER XXI.