"What is the Eagle?"

"An air ship."

Old Solitary gave a muttered exclamation of incredulity.

"Impossible!"

"It is not impossible," asserted Frank. "It was in the Eagle that we came here from Blake."

"Thot's roight," agreed Barney.

Then in a few words Frank told the man of their trip from Blake, how Professor Scudmore had gone mad, and how they had captured the ship from the professor, who afterward escaped and got away with the Eagle in the night.

The boy's apparent sincerity convinced Old Solitary that he spoke the truth, and by the time Frank had finished, the air ship had settled close to the earth. They could see its outlines through the darkness, and could see a man in the car.

The Eagle came down gently, and the man stepped out.

"It was somewhere amid these mountains that I left those poor boys," he murmured. "There is not one chance in ten thousand that I shall ever find them again."