A concentrated bellowing cut off the rest of her words. Driven towards higher ground by the heat of the flames, the dinosaurs were trampling up the path leading to the tunnel.

Once again Carruthers rallied his army of apemen around him and attempted to drive the mammals away. As they reached the end of the tunnel a cloud of dense smoke stung their eyes. The apemen shrilled in a sudden panic and forgot all their previous training in driving off the dinosaurs. Like scurrying rats they scattered.

Flames from the conflagration broke through the smoke--flames that leaped and twisted skyward.

Carruthers flung off the fear that held him spellbound and started along up the path leading to the top of the plateau. A disheveled figure appeared suddenly at his side--Nanette!

"Come," he whispered, hoa.r.s.ely. "We've got to get out of this or we'll choke to death."

"But Zark," breathed the girl, "He and his followers are still in the cavern. We can't leave them."

Like one demented of reason, Carruthers raced back along the tunnel to the cavern. "Zark!" he shouted.

The sound of his voice was drowned in the welter of screaming bedlam coming up from below as the dinosaurs and apes fought for the supremacy of life. But of Zark and his six followers he found absolutely no sign. Quickly he hurried back to where he had left Nanette.

Even as he reached the spot he had a sudden premonition of danger. A gorilla, huge and black, brushed past him on the path, carrying a limp burden under his s.h.a.ggy arm.

"Stop!" commanded Carruthers, hurrying after the animal.

A huge arm knocked him sprawling. Spitting blood Carruthers staggered to his feet. Up to this time he had felt no fear of the gorillas. They had been orderly and well behaved. Fearful that harm would come to the girl he ran after the dark figure ahead. The red glow of flames swept nearer. The gorilla came to a stop and faced its pursuer. l.u.s.t shone from its close-set eyes--l.u.s.t and pa.s.sion.

Carruthers stopped dead in his tracks. "Drop her!" he demanded.

The animal snarled hoa.r.s.ely. There came the sound of ripping cloth.

Nanette screamed--a terrifying scream that echoed and re-echoed through the electron night.

It was then that the thin cloak of civilization dropped from Aaron Carruthers' back. He became in a single moment an animal fighting for his mate. With a snarl equally vicious as that of the gorilla pawing at the helpless girl, he lunged forward.

Mouthing his rage, the gorilla flung the earth man to the ground.

Carruthers came up frothing at the mouth. With grim intensity he fastened himself to the animal's free arm. The raging mammal staggered helplessly under the extra burden and dropped the girl to concentrate his fury on the man. It raised a hairy arm aloft for the smashing blow. Instinctively Carruthers released his hold.

At that very moment the electron lurched sickeningly, causing them both to lose their footing. The violent upheaval sent Carruthers one way and the gorilla the other. While the man stumbled to his feet to resume battle he saw the infuriated monster stagger over the edge of the plateau wall into a sheer drop of a thousand feet.

Starkly through the night came the growling roars of the giant beasts from the jungles below. Nanette fluttered to his side. Her dress was torn and dragged on the ground. For all her disheveled appearance she was still beautiful to look upon. Forgetful of the danger on all sides of him, the animal in Carruthers saw in her pitifully half-clad body the same thing that the beast had desired. His head whirled hotly.

"Aaron!" she pleaded as his arm reached out to clutch her.

Hungrily he drew her to him. The pale light of the electron moon mingled with the roaring blast of the flames. Madness inflamed his heart and pounded his blood.

"Don't, Aaron," protested the girl, trying to free herself.

Something in the quality of the girl's frightened tones brought the man back to normal. He fought against the overwhelming desire to possess with all the force of his nature. And the better half triumphed. No longer was he an animal, but a reasoning human being.

With a faint sigh he released her and wiped a hand across his dripping forehead.

"I'm sorry, Nan," he murmured. "That great brute drove me mad for an instant. I'm all right now."

Together they stood in the electron night and watched death creep closer and closer. The plateau was entirely surrounded with flames now and the heat was increasing with each pa.s.sing moment. As it increased they backed towards the center.

From under their feet came the choking cries of the apemen. They had returned to the cavern only to be overcome by smoke fumes. While yet the earth people stood there waiting and watching the red death creep nearer, the path leading downward into the jungle became a ma.s.s of moving shadows.

"The dinosaurs!" cried Nanette. "Oh, Aaron! We are lost!"

"Steady, girl," soothed the man. "If we stand still they might not see us in the dark. The smoke will destroy our scent."

But as the minutes pa.s.sed the herd of monsters increased. They crowded along the path and spread out over the top of the plateau. Once again the smell of their glistening bodies fouled the nostrils of the earth people.

Slowly Carruthers guided Nanette back towards the ring of rocks--perhaps the barrier would serve to keep the animals away. He scrambled across one of the boulders and pulled the girl after him. As he did so, a violent subterranean action shook the electron from one end to the other.

Carruthers braced his feet against the ring of rocks to keep from pitching headlong to the ground. Nanette clung to him wordlessly. All around them the giant forces of nature raged sullenly. Twisting seams appeared in the rocky floor of the plateau from which oozed gaseous vapors.

"Courage," soothed Carruthers as he held the quivering body of the frightened girl close to his own. "This can't last."

But the ground continued to lurch and heave on its axis. Vivid lights crossed and criss-crossed the atomic heavens. The fissures in the ground appeared now as black ca.n.a.ls. The lower part of the circle of boulders disappeared. Off to the right came despairing screams. White bodies glowed for an instant against the background of flames.

"Zark!" shouted Carruthers, as he saw the leader of the tribe of Esau and his followers making their way along the plateau top.

Zark must have heard the earth-man's voice, for he started forward at a run. Simultaneously there appeared a herd of the greatest of all the prehistoric monsters--the Brontosaurus. They balked enormously against the flame-licked skies. Zark and his followers attempted to avoid them. But fear of the scorching flames drove the monsters forward.

There followed a maddening moment of unutterable pain for the remaining ones of the tribe of Esau, then the herd trampled them underfoot and rumbled towards the half circle of rocks where the two earth people were crouched.

The leader of the Brontosaurus herd trumpeted madly and barged for the higher ground of safety. Too late did instinct warn it of the widening fissure underfoot. Before it could stop the pressure of the herd drove it into the crevice.

Carruthers drew back to the extreme inside edge of the boulders trying to still his ears against their insane bellowings. A cloud of heavy, choking smoke enveloped him for a moment then pa.s.sed away. Then it was that he saw a new star in the atomic heavens,--a star that seemed to burn with the brilliance of a meteor. Even as he watched he was conscious of it drawing closer.

The planet was now in a continuous uproar. The ground was heaving and trembling as if from some inward strain. This was the end. Carruthers realized it with a sinking heart. In another minute the electron would disintegrate into a flaming ma.s.s of matter and fling itself from its...o...b..t around the atom.

And then the light from the approaching star struck them in a blinding radiance of vermilion flames. Carruthers held his breath. Some invisible force seemed to take possession of his body and that of the girl at his side. The rocky plateau, now a boiling ma.s.s of rocks, dropped from under their feet. Clear, cold air enveloped their bodies.

Then with the speed of light their bodies were hurled through planetary s.p.a.ce, up, up, up into the vast reaches of the higher ether.

Darkness a.s.sailed them. The flames from the jungle fire vanished into nothingness. The electron moon paled to the size of a pin point, then went out.

Carruthers had the feeling of expansion and growth. It was as if his body was taking on the size of the whole world. It seemed to last for hours, days, ages. But all the while he clung fast to the slender, quivering body of Nanette.

Mountains and hills suddenly blazed before his eyes. Straight up and down mountains. He tried to stir his sluggish mind into action. What did they mean? Where had he seen them before? And while yet his mind struggled with the problem the mountains dwindled like melting snow.

The pressure around his body relaxed. A blinding glare of steady light played upon his face. Then all was quietness and peace.

"Nan! Aaron!" The voice was Karl's.