"Naturally the human life within atoms of our own earth has developed in our own image," Professor Carter was saying. "The same life-source--same general lines of evolution. A different environment--that, and a different size. But still fundamentally the same. Why, I'll be able to lecture on this, George. That girl Lea--she can appear with me." He slapped George enthusiastically on the back. "This will be a big thing for us, boy. We'll be world famous, once we make it known." "Will we?" Young Carter sat with his gaze focused far through the walls of the living room--gazing out to the conjured vision of a world of Heanas, and savage Malobs. The lamplit living room here was silent. Alice had gone to bed. Lea had retired to her room up there also. "I was thinking," George said. "That fellow Taroh--Lea stole his drug, but he can make more. Why not? Maybe by now that's what he's done. To trample gigantic, upon Lea's people--to wreck that little city--" It seemed that there was a faint noise at the top of the hall stairs. George and his father glanced up inquiringly, then decided that it was nothing. "We must get the rest of that enlarging drug away from her," Professor Carter said. "I didn't want to tackle her tonight--she's been so unreasonable about that package under her arm. We'll get it, George, I'll demonstrate it to the scientific societies to prove our statements, and then, good God, it must be destroyed. Too damn dangerous. Why, if a thing like that fell into the wrong hands here, it could devastate the world!" But George was thinking only of poor little Lea. Marooned here. She was worried about her people, of course.... After Professor Carter had gone to bed that night, for a long time George sat alone in the sitting room, pondering. To his father the fate of that tiny world was only an interesting scientific thesis. He realized that a billion billion other atomic worlds might be struggling, unseen, inaccessible to us.... Upon impulse, young Carter suddenly left the sitting room and went quietly upstairs. Very gently he knocked on Lea's door. "Lea? You asleep?" "Oh--that is you, George? Come in." Clad in a pair of Alice's blue pajamas, Lea was sitting on the bed--slim little figure with the lamplight softly painting her, glinting in her pale-gold hair with tints of burnished silver. Her hair was streaming down over her shoulders; it framed her face on which now a shadow of terror had gathered. "You heard what I mentioned to father," George said. "About Taroh maybe making more of the drug?" "Yes. That I did. Oh, George--I thought what I did for my world was the best." Contrition was upon her. "It was," he said hastily. He had closed the door behind him; he lowered his voice. "Lea, father wants to get that drug away from you and destroy it. But I was thinking--chemists here, analyzing it, might be able to create its reverse."