Of course his gesture was futile, as a dozen men could not have held the great gas bag that Perry had made.

The old man looked up at the great balloon, rapidly growing smaller as it rose; then he sat down, and, covering his face with his hands, commenced to sob; for he knew that Dian the Beautiful was already as good as dead. No power on earth or within it could save her now.

How high she would be carried he could not even guess, nor how far from Sari. She would doubtless die from lack of oxygen, and then her body would be carried for a thousand miles or more before the bag would lose sufficient gas to bring it down.

He loved Dian the Beautiful as he would have loved a daughter, and he knew that David Innes worshipped her. Now he had killed Dian and wrecked David's life-the two people he loved most in the world. His silly inventions had done a little good and some harm, but whatever good they had accomplished had been wiped out by this. Worst of all, he realized, was his criminal absent-minded carelessness.

Dian felt the sudden upward rush of the balloon. She looked down over the edge of the basket and instantly realized what had happened. Everything was growing smaller down there. Soon she could no longer distinguish people. She wondered what would become of her. Perhaps she would be carried up to the sun and incinerated. She saw that the wind was carrying the balloon in a south-westerly direction.

She did not realize the greatest error of all that Perry had made; neither did Perry. He had arranged no rip cord on the gas bag. With that, Dian could have let gas out of the bag gradually and made a landing within a comparatively few miles from Sari. Perry was always leaving some essential thing off of everything he built. His first musket had no trigger.

Dian the Beautiful guessed that she was as good as dead. She cried, but not because she was afraid to die. She cried because she would never see David again.

And David, far away, reached the rim of the crater and looked over. Below him, scarcely a hundred feet, he saw a round valley, green with verdure. He saw a little lake and grass thatched shelters and people. He saw Hodon and O-aa. His surmise had been correct.

He saw the strange sabertooth people. There were a couple of hundred of them. How could he, single handed, rescue Hodon and O-aa from such an overwhelming number of enemies?

David Innes was resourceful; but the more he cudgeled his brains, the more hopeless a solution of his problem appeared. It would profit them nothing if he went down into the crater. That would mean simply his own capture; then he could do nothing for them.

He examined the crater closely. The inside walls were perpendicular and unscalable in all but a single place. There the wall had crumbled inward, the rubble forming an incline that reached to the top of the rim that was little more than fifty feet above the floor of the crater at that point. There was an avenue of escape, but how could he call Hodon's attention to it. How could he create a diversion that would take the attention of their captors from them long enough for them to make a break for freedom.