I pointed upward, for I was feeling the need for fresh air again, and slowly mounted the ladder. This time she did not grasp me, but watched me intently, as though understanding what I did, and the reasons for it. "Bring one of your gadgets over here, Mercer," I called across the pool. "I think I'm making progress." "Good boy!" he cried, and came running with two of the antennae, the long insulated cords trailing behind him. Through the water the girl watched him, evident dislike in her eyes. She glanced at me with sudden suspicion as Mercer handed me the two instruments, but made no hostile move. "You won't be able to stay in the water with her," explained Mercer rapidly. "The salt water would short the antennae, you see. Try to get her to wear one, and then you get your head out of water, and don yours. And remember, she won't be able to communicate with us by words--we'll have to get her to convey her thoughts by means of mental pictures. I'll try to impress that on her. Understand?" * * * * * I nodded, and picked up one of the instruments. "Fire when ready, Gridley," I commented, and sank again to the bottom of the pool. I touched the girl's head with one finger, and then pointed to my own head, trying to convey to her that she could get her thoughts to me. Then I held up the antennae and placed it on my own head to show that it could not harm her. My next move was to offer her the instrument, moving slowly, and smiling reassuringly--no mean feat under water. She hesitated a moment, and then, her eyes fixed on mine, she slowly fixed the instrument over her own head as she had seen me adjust it upon my own. I smiled and nodded, and pressed her shoulder in token of friendly greeting. Then, gesturing toward my own head again, and pointing upward. I climbed the ladder. "All right, Mercer," I shouted. "Start at once, before she grows restless!" "I've already started!" he called back, and I hurriedly donned my own instrument. Bearing in mind what Mercer had said, I descended the ladder but a few rungs, so that my head remained out of water, and smiled down at the girl, touching the instrument on my head, and then pointing to hers. I could sense Mercer's thoughts now. He was picturing himself walking long the shore, with the stormy ocean in the background. Ahead of him I saw the white body lying face downward in the pool. I saw him run up to the pool and lift the slim, pale figure in his arms. * * * * * Let me make it clear, at this point, that when I say that I saw these things, I mean only that mental images of them penetrated my consciousness. I visualized them just as I could close my eyes and visualize, for example, the fireplace in the living room of my own home. I looked down at the girl. She was frowning, and her eyes were very wide. Her head was a little on one side, in the attitude of one who listens intently.