won't stop until they've finished us and the aeroplane too."
"Then what's to be done?" demanded Mr. Anderson.
"Get into the airship!" cried Mr. Durban. "Send her up. It's the only way to get out of their path. Then we can shoot them from above, and drive them away!"
Quickly the adventurers leaped into the craft. On thundered the buffaloes. Tom feared he could not get the motor started quickly enough. He did not dare risk rising by means of the aeroplane feature, but at once started the gas machine.
The big bag began to fill. Nearer came the wild creatures, thundering over the ground, snorting and bellowing with rage.
"Quick, Tom!" yelled Ned, and at that instant the Black Hawk shot upward, just as the foremost of the buffaloes passed underneath vainly endeavoring to gore the craft with their sweeping horns. The air-travelers had risen just in time.
"Now it's our turn!" shouted Ned, as he began firing from above into the herd of infuriated animals below him. Tom, after seeing that the motor was working well, sent the airship circling about, while, standing in the steering
