Abruptly a sigh of despair escaped his lips. The walls of the canyon narrowed suddenly, and across it stretched a wall of bare rock. He realized too late that he had returned to the base of the plateau where he had spent the night. The grim, towering walls hemmed him in completely from three sides. At the fourth side bulked the dinosaur, coming slowly, ponderously.

Beady eyes peered down cunningly at the helpless man and woman.

Confident now that its prey couldn't escape, it extended its huge bulk across the narrow canyon for a leisurely killing.

Carruthers glared at the monster with fear-distended eyes. In his heart he realized that there was no escape. He had no means of defense, no way to combat the huge monster but flight. And even that was now denied him.

Closer and closer inched the killer until its great, red mouth appeared like the fire box of a huge boiler. Hot breath fanned the man's cheek. The nauseous odor of the beast made his stomach wrench.

He dropped to his knees close to the inert figure of the girl and glared vengefully into the beady eyes.

The gaping mouth at the end of a long, supple neck jerked forward.

Carruthers dragged the girl away just in time to escape the gnashing teeth. The dinosaur stamped angrily.

Once again Carruthers felt its hot breath beating upon his face. He cringed at the thought of this kind of death. No one would ever know how it happened. Not even his closest friend, Karl Danzig! What a mess things were. Why didn't the red mouth of the mighty dinosaur close over him and crush out life? Why must he kneel in torture?

From near at hand a piercing scream rang through the air. A harsh scream. A terrifying scream!

Carruthers raised his head. The dinosaur had twisted around to glare hatefully at the disturber of its meal. Other screams splintered the forest air. And as the kneeling man watched he saw the great red ape who had been dodging his footsteps a short time before, slouch between the dinosaur's hulking body and the wall of the cliff. Behind it came others--black mammals with curving arms that dragged along the ground.

Their fangs were bared. They were in an ugly mood. Arriving in front of the dinosaur and less than four feet from the earth man and woman, the leader silenced its followers with a low growl and turned in concentrated fury upon the dinosaur. Its long arms drummed a throbbing tattoo upon its hairy chest.

The dinosaur bellowed protestingly against the att.i.tude of the apes and gorillas. The ape leader protested with equal violence. The dinosaur shifted uneasily, wagging its heavy head from side to side.

On all sides came deep growls from the mammals.

Carruthers watched all this display torn between doubt and fear. Which side would win? How could the apes and gorillas, huge as they were, hope to force the dinosaur away? But the apes were masters. This much was apparent. Inch by inch the dinosaur backed away, glaring vengefully. And having reached a spot where it could turn around it did so. Presently the ground trembled as it made off through the steaming jungle. The leader of the mammals turned and faced the earth people. Long, searching minutes pa.s.sed. Its close set eyes seemed to be studying them.

Nanette stirred and opened her eyes. The sight of the anthropoids caused her to recoil.

"Steady, Nan," spoke Carruthers softly.

Other apes and gorillas gathered around the giant red animal. They displayed no hostility, only an intense interest. One by one they squatted before the earth people until they formed a half circle, reaching from the one wall of the rocky plateau to the other.

While they sat there it began to grow dark. Carruthers removed his watch and ventured a glance at it. Daylight had lasted less then three hours. An hour for twilight, then it would be dark. Evidently the cycle around the nucleus of the atom took approximately ten hours.

Nanette sat up. "Aaron!"

He answered without removing his eyes from the red ape less then four feet away. "Don't look at me, Nan. Concentrate on the big, red fellow.

He's evidently in control. If we act the least bit frightened they might decide to destroy us."

"What are they waiting for? Why don't they go away?"

"We'll know before long. I imagine they're trying to figure out who we are and what we are doing on their tiny planet."

Darkness descended rapidly. Overhead, a small moon rose majestically in the heavens and started its journey through the night. Its faint light revealed the fact that the apes showed no intentions of leaving.

They still squatted before the earth people, in a half circle of staring brown eyes.

Whatever fear Carruthers had felt towards the animals died away.

"They're harmless," he told Nanette. "Get some sleep if you can."

Long after the tired girl had drifted into slumber Carruthers sat with his back against the wall, mentally trying to figure the whole thing out. The dinosaur was real enough. Yet the apemen had frightened it away, in fact had compelled it to go without actually engaging in combat. No question about it. The anthropoids were in control. But who controlled them?

Quite suddenly his eyes snapped open. Daylight had come again. He must have fallen asleep. The shrill chatter of the apeman came to his ears.

The red ape leader shuffled to his feet and looked from the earth people to the spot in the jungle whence came the chatter. Abruptly he opened his mouth and emitted a flood of gibberish sounds.

The gorillas and apes at his side flattened their bodies against the rocky walls in att.i.tudes of expectant waiting.

"What's happening?" gasped the girl.

"There's no telling," whispered Aaron. "It must be someone or something of importance. Note the expressions of awe and reverence on the faces of the apemen. My G.o.d, Nanette, look!"

Out of the depths of the jungle emerged seven white beings--human or animal it was impossible to tell. They were huge creatures with the bodies of men. Erect of carriage, almost human in looks, they contrasted strangely with the red apes and the black gorillas. Six of them appeared to act as bodyguard for the seventh.

As they reached the s.p.a.ce in front of the two earth people, the bodyguard stepped aside. The seventh white one came to a dead stop.

Long and intently he stared at the man and girl crouched against the wall. And the scrutiny seemed to please him, for he smiled.

Carruthers eyed the figure uneasily. He saw what seemed to be a man dressed in a long, fibrous garment. With white hair and beard, it was a strange figure indeed for an apeman. He saw also that the eyes were well s.p.a.ced, a mark of intelligence. The forehead was high and broad.

And as Carruthers mentally studied the creature, strange and bizarre thoughts crossed his mind.

The mouth of the white apeman twitched as if he were going to speak.

The heavy lips parted. A single word came to Carruthers' ear--"Man?"

Carruthers nodded. "We are from the earth."

The lips of the apeman moved painfully as if speech came with the utmost of difficulty. "The prophecy of the Great One has been fulfilled even as it has been written."

The red apes and black gorillas allowed their eyes to wander from their white leader to the two earth people. And their faces reflected the supernatural awe with which they regarded the earth people.

"It's uncanny that an animal can speak our language," breathed Nanette.

As if he hadn't heard her, Carruthers spoke again. "We are from the earth," he repeated. "We have been on your world many hours, and we are both hungry and thirsty."

"Words come hard," came from the lips of the white bearded one. "I have not used them for years."

"And who are you?" asked Carruthers.

The white bearded one paused as if to recall some distant echo from the past. "I am the last of the tribe of Esau. But come! This is no place for speech. Long have I and my followers waited for this hour."

Without another word he swung around. The six guards enclosed his aged body in a hollow square and the procession moved away. They came after a short journey to a natural opening leading to the heart of the plateau. The apes and gorillas, with the exception of the red leader, remained outside. The remainder of the party pushed through a tortuous tunnel until they reached a cavernous opening directly beneath the plateau. Vertical openings in the walls furnished light and air. The white chieftain spoke in a strange tongue to his followers, and they instantly prepared three couches in a far corner of the cavern.

As the earth people seated themselves on the skins that made up the couch they were both conscious of a far-away rumbling like peals of thunder. Not having seen any signs of a storm outside Carruthers turned inquiringly on the aged chieftain.