At her utmost speed the big aeroplane bore down on the scene of the unequal combat between Ben Stubbs and the savage beasts.

The boys could see that one of the brutes had seized their stalwart companion's rifle from him and with incredible strength had broken it in half as if it had been a wooden toy. The next minute Harry's rifle spoke and the gorilla that had just performed the miraculous feat of strength fell dead. With a shriek of rage the others turned to see whence came this new enemy.

At the sight of the great aeroplane bearing down upon them they at first started to flee with howls of terror, but the next minute they rallied and with low growls of rage, that bared their cruel fangs, they deliberately waited to see what this strange object might be.

This gave Ben a brief respite and he occupied it by reloading his revolver. The boys were delighted to see by this that their brave comrade was not seriously injured.

But now the Golden Eagle II was ready to settle and Frank, guiding his aerial steed with one hand, grasped his revolver with the other, for it was evident that the rush would come as they struck the ground. And come it did. As the wheels of the aeroplane struck the earth and Frank threw in the brakes sharply crashing into a rocky wall, with a howl of defiance the whole horde of man-like brutes rushed down on the air-craft with wicked rage in their spiteful little red eyes.

The leader of them, a huge "old man" gorilla, brandished an immense stone which he hurled with vicious energy at the new arrivals. Luckily it fell short of the air-ship or it would have crashed through the plane covers and have seriously crippled, if not ruined, the air-ship.

The boys' rifles cracked simultaneously and two of the attackers rolled over, with horrible human-like cries, but the leader, the bad "old man," was still in the field. As he saw his fellows fall he gave a mighty yell of rage and hatred that seemed to come from the depths of his hairy chest, and beating rapidly on it, as if it were a war-drum he rushed straight at the aeroplane.

"Don't let 'em get near the engines," was all Frank had time to shout before the avalanche of hairy, ill-smelling brutes was upon them. Some of them had armed themselves with rocks which they hurled with ferocious force. Others used nothing but their bare hands. Some of them, wounded as they were, fought with added fierceness. Desperately the boys fought them off and when the magazines of the rifles and revolvers were emptied they fell back on their hunting knives.

Frank had made a furious lunge at the "old man" and missed him by a hair's-breadth when he felt two great hairy arms encircle him from behind and the hot breath of one of his horrible opponents whistling savagely in his ear. He tried to lunge backwards at the creature, but toppled over and fell sprawling. In a flash the "old-man" gorilla was on him when Ben's revolver cracked and the "old-man," badly wounded, sprang high into the air and rolled over and over, clutching his head with both his huge hands and screaming in an agonized manner.

The fall of their leader seemed to discourage the others. They fought on for a while but it was half-heartedly. The boys had had time in the brief pause that followed the killing of the "old-man" to reload, and with their rifles newly charged they were in position to make terrible reprisals on the gorilla band for the mischief they had wrought. The monsters evidently were about to quit the battle when suddenly a cry rang through the air that ended the fight more abruptly than even the boys' bullets could have done.