flattering way he raised his glass to her, even at what she saw through the window. Sometimes it seemed to him that she was laughing at nothing at all. He tried to think of how he had reacted the first time he had taken the drug. He hadn't been quite so aggressively cheerful, not quite so—hysterical. But then, the drug didn't have exactly the same effect on everyone. She wasn't as well balanced as he had been. The important thing was that she was happy. Curiously enough, he himself wasn't happy at all. It took about five seconds for the thought to become clear to him, five seconds in which he passed from dull amazement to an enraged and horrified comprehension. He sprang to his feet, overturning the table at which they still sat. And he saw that she wasn't surprised at all, that she still stared at him with a secret satisfaction. "You've cured me!" he cried. "You've fed me the antidote!" And he began to curse. He remembered the other time she had tried it, the time when he had been on the alert, and had easily detected the strange metallic taste of the stuff. He had spat it out, and under the influence of the drug from which she had hoped to save him, he had laughed at her. Now he was unable to laugh. He had been so intent on feeding the tablet to her that he had forgotten to guard himself, and he had been caught. He was normal now—her idea of being normal—and he would never again know the wonderful feeling the drug gave. He began to realize his situation on this horrible lonely asteroid. He cast a glance at the window and at what must be waiting outside, and it was his turn to shudder. He noticed that she was still smiling. He said bitterly, "You're the addict now and I'm cured." She stopped smiling and said quietly, "Jim, listen to me. You're wrong, completely wrong. I didn't give you the antidote, and you didn't give me the drug." "I put it in your wineglass myself." She shook her head. "That was a tablet I substituted for yours. It's an anti-virus dose from our medicine chest. You took one of the same things. That's why you feel so depressed. You're not under the influence of the drug any more." He took a deep breath. "But I'm not cured?" "No. I knew that I wouldn't be able