"I climbed out from here," Lea said. "I am sure it was just about here where nearly I was crushed. But it looks so very different now." She was puzzled as she gazed about them--gazed at what now was a broad, curving valley with great mountainous sides towering up into the luminous darkness overhead. "Look here," he said, "I'm getting the hang of this. The secret is not to wait until you're too small before going anywhere. Which way next?" She was still puzzled. And then she brightened. "Why, it is right here. I see it now." It was a steeply descending little chasm. It had been a mere crack a moment ago so that she had not recognized it. Now it was a ten-foot rift, with a bottom smooth as black marble--a slide steeply descending into darkness. Carter peered dubiously. "How far down is it?" "Not far. I was so big, I jumped up just as these walls almost closed upon me." He and the girl were very much smaller than that now. They lay down, feet first, at the top of the slide. For a moment he hesitated. How far down would it be for them in this size? But every moment of hesitation was making that worse! "All right, Lea. Here we go." Half sliding, half climbing, they started. The smooth, marble-like slide had roughened. Little stones began sliding with them. "Easy!" he gasped. "Don't go too fast!" He clutched her; they slid together a dozen feet; wildly scrambled to a stop. Then Lea lost her foothold. He gripped at her, and lost his own. Then they were bumping, rolling with a clatter of loosened stones coming after them. And then the terrified Carter was aware of a fall. And a rock struck his head with a bursting roar of light as his senses slid off into the soundlessness of oblivion.... * * * * * He came to himself with the knowledge that Lea was holding him, kneeling beside him in a luminous darkness. "Oh, you are all right now?" she murmured anxiously. "Yes. I guess so." Dizzily he sat up. "What happened?" "We fell." "You--it didn't hurt you?" "No. I guess not much." The action of the drug had worn off. As his head cleared he saw that the rocks were motionless; the ground on which he sat at last was steady. Around them now was a great void of luminous darkness with an undulating landscape of naked rocks dimly visible. In a moment it seemed to Carter that his eyes were becoming accustomed to the darkness. He could see, far away in the distance where the ground rose up seemingly to meet the sky. "Shall we take another pellet now, Lea?" he suggested at last. "All right," she agreed.