"But no other after-effects?"
"I can't think of any others. Except, perhaps, a feeling of exhaustion after I've gone through what I've just finished." He closed his eyes as if to shut out the recollection.
"Well," mused the Doctor, "we'll forget the physical symptoms. What happens to your individuality, your own consciousness, while you're suffering an attack?"
"Nothing happens to it," said Nick with a suppressed shudder. "I watch and hear, but what he does is beyond my control. It's terrifying—horrible!" he burst out suddenly.
"Doubtless," responded Horker smoothly. "What about the other? Does that one stand by while you're in the saddle?"
"I don't know," muttered Nick dully. "Of course he does!" he added abruptly. "I can feel his presence at all times—even now. He's always lurking, waiting to spring forth, as soon as I relax!"
"Humph!" ejaculated the Doctor. "How do you manage to sleep?"
"By waiting for exhaustion," said Nick wearily. "By waiting until I can stay awake no longer."
"And can you bring this other personality into dominance? Can you change controls, so to speak, at will?"
"Why—yes," the youth answered, hesitating as if puzzled. "Yes, I suppose I could."