“That is what we don’t know,” said Mr. Anderson. “The native scout could not learn that. But once we get on the trail of the dwarfs, I think we can easily find the particular tribe which has the captives.”

“At any rate, we’ll get started and do something,” declared Tom, and the next day, after the African hunter had described, as well as he could, where the place was, the Black Hawk was sent up into the air, good-bys were called down, and once more the adventurers were under way.

It was decided that they had better proceed cautiously, and lower the airship, and anchor it, sometime before getting above the place where the pygmy village was.

“For they may see us, and, though they don’t know what our craft is, they may take the alarm and hide deeper in the jungle with the prisoners, where we can’t find them,” said Tom.

His plan was adopted, and, while it had taken the native hunter several days to reach the borders of the dwarfs’ land, those in the airship made the trip in one day. That is, they came as far toward it as they thought would be safe, and one night, having located a landmark which Mr. Durban said was on the border, the nose of the Black Hawk was pointed downward, and soon they were encamped in a little clearing in the midst of the dense jungle which was all about them.

With his electric rifle, Tom noiselessly killed some birds, very much like chicken, of which an excellent meal was made and then, as it became dark very early, and as nothing could be done, they lighted a campfire, and retired inside their craft to pass the night.

It must have been about midnight that Tom, who was a light sleeper at times, was awakened by some noise outside the window near which his stateroom was. He sat up and listened, putting out his hand to where his rifle stood in the corner near his bunk. The lad heard stealthy footsteps pattering about on the deck of the airship. There was a soft, shuffling sound, such as a lion or a tiger makes, when walking on bare boards. In spite of himself, Tom felt the hair on his head beginning to creep, and a shiver ran down his back.

“There’s something out there!” he whispered. “I wonder if I’d better awaken the others? No, if it’s a sneaking lion, I can manage to kill him, but—”

He paused as another suggestion came to him.

The red pygmies! They went barefoot! Perhaps they were swarming about the ship which they might have discovered in the darkness.