“I don’t want to interfere with your plans,” said Mr. Anderson, “but I would like to rescue those missionaries. But the trouble is, I don’t know just where to look for them. We couldn’t get much of a line in Majumba on where the country of the red pygmies is located. What do you think about it, Mr. Durban?”

“As far as elephant hunting goes we can probably do as well in the pygmy land as anywhere else,” answered the veteran, “and perhaps it will be well to head for that place. If we run across any elephant herds in the meanwhile, we can stop, get the ivory, and proceed.”

They discussed this plan at some length, and agreed that it was the best thing to do. Mr. Durban had a map of the country around the center of Africa, and he marked on it, as nearly as he could, the location of the pygmies’ country, while Mr. Anderson also had a chart, showing the location of the mission which had been wiped out of existence. It was in the midst of a wild and desolate region.

“We’ll do the best we can,” declared Tom, “and I think we’ll succeed. We ought to be there in about a week, if we have no bad luck.”

All that night the Black Hawk flew on over Africa, covering mile after mile, passing over jungle, forest, plains, rivers and lakes, and, doubtless, over many native villages, though they could not be seen.

Morning found the travelers above a great, grassy plain, dotted here and there with negro settlements which were separated by rivers, lakes or thin patches of forest.

“Well, we’ll speed up a bit,” decided Tom after breakfast, which was eaten to the weird accompaniment of hundreds of native warning-drums, beaten by the superstitious blacks.

Tom went to the engine room, and turned on more speed. He was about to go back to the pilot house, to set the automatic steering apparatus to coincide with the course mapped out, when there was a crash of metal, an ominous snapping and buzzing sound, followed by a sudden silence.

“What’s that?” cried Ned, who was in the motor compartment with his chum.

“Something’s gone wrong!” exclaimed the young inventor, as he sprang back toward the engine. The propellers had ceased revolving, and as there was no gas in the bag at that time, it having been decided to save the vapor for future needs, the Black Hawk began falling toward the earth.