"Ah, you hear it too," murmured the other. "For centuries, we of the great tribe of Esau have fought for the supremacy of our little world—ever since the Great One appeared in our midst and instructed us in world knowledge."

"And this Great One, as you call him," spoke Carruthers. "Who was he?"

"He was from your world. I never saw him. He comes to me as a legend. For years he toiled among us, teaching and instructing until we mastered his language. He called himself Dahlgren. Later he ruled all the tribes. We of the Esau line he made into leaders because of our higher intelligence. The tribes of Zaku were trained for war. Perhaps you have noticed the chief of all the Zakus. He is crouching now beside the entrance to our inner walls. He is Marbo, and his followers live in the jungles."

"And does he talk as you do?"

The white chieftain shook his head. "No. Only we of the Esau tribe have mastered speech. Not counting the women of our tribe that comprise our numbers we are only seven in all."

"I owe Marbo my life as does also my companion," said Carruthers.

"Marbo looks upon you earth people as gods," spoke the old chieftain. "He and his followers will protect you with their lives."

"And who rules over and beyond?" questioned Carruthers, waving his arm to cover the remaining portion of the electron.

"There is no rule beyond except that of force. The Great One called them by name, Morosaurus, Diplodocus, the Horned Ceratosaurus, and many others whose names I have long forgotten. They are our enemies whom we cannot destroy. And their numbers increase from year to year and are slowly backing us upon our last stronghold."

"Isn't there anything we can do?" asked Carruthers, feeling a quiver of apprehension along his spine.