And in a few seconds the last lumps of quartz had disappeared.

“We are still falling! Empty the water-tanks! Do you hear me, Joe? We are pitching into the lake!”

Joe obeyed. The doctor leaned over and looked out. The lake seemed to come up toward him like a rising tide. Every object around grew rapidly in size while they were looking at it. The car was not two hundred feet from the surface of Lake Tchad.

“The provisions! the provisions!” cried the doctor.

And the box containing them was launched into space.

Their descent became less rapid, but the luckless aëronauts were still falling, and into the lake.

“Throw out something—something more!” cried the doctor.

“There is nothing more to throw!” was Kennedy’s despairing response.

“Yes, there is!” called Joe, and with a wave of the hand he disappeared like a flash, over the edge of the car.

“Joe! Joe!” exclaimed the doctor, horror-stricken.