Reaching the massive stone structure they dashed through a high arched doorway and found themselves in a long passage.

This proved to be a perfect labyrinth, but finally the rescuers came out in a high walled room in the centre of the structure.

And here, sitting upon the stone floor and bound hand and foot, were the three prisoners.

Lucille was pale but brave, and at sight of the rescuers gave a great cry of joy.

The next moment her bonds were cut and she was in her father’s arms, unharmed.

It was a joyful reunion, and among the happy ones was Jack Wallis.

The looks given each other by the young lovers were of the warmest description.

The airship had descended now, and Professor Gaston was exploring the huts of the barbarians.

“A strange race!” he declared. “Unlike any other on the face of the earth.”

He collected much valuable data and many specimens. Then all returned to the deck of the airship.