He had gotten three or four steps away before I called out, "Boss!"

He stopped and turned, his face expressionless. "Wait," I added, "I'm coming."

"You don't have to."

"I know. I'll do it. It-It just takes . . . a while-to get your nerve back."

He did not answer but, as I came alongside him, he grasped my upper arm, warmly and affectionately, and continued to hold it as we walked, as if I were a girl. We went on in, through another locked door and into a room that was conditioned warm and moist. The ape was there, caged.

He sat facing us, his torso supported and restrained by a strap-metal framework. His arms and legs hung limply, as if he had no control over them-which he did not have, as I learned.

As we came in he looked up and at us. For an instant his eyes were malevolent and intelligent; then the fire died out and they were merely the eyes of a dumb brute, a brute in pain.

"Around to the side," the Old Man said softly. I would have hung back but he still had me by the arm. We moved around; the ape followed us with his eyes, but his body was held by the frame. From the new position I could see-it.

My master. The thing that had ridden my back for an endless time, spoken with my mouth-thought with my brain. My master.

"Steady," the Old Man said softly. "Steady. You'll get used to it." He shook my arm. "Look away for a bit. It helps."

I did so and it did help. Not much, but some. I took a couple of deep breaths, then held it and managed to slow my heart down a little. I made myself stare at it.

It is not the appearance of a parasite which arouses horror. True, they are disgustingly ugly, but not more so than slime in a pond-not as much so as maggots in garbage.

Nor was the horror entirely from knowing what they could do-for I felt the horror the first time I saw one, before I really knew what one was. I tried to tell the Old Man about it, letting the talk steady me. He nodded, his eyes still on the parasite. "It's the same with everybody," he said. "Unreasoned fear, like a bird with a snake. Probably its prime weapon." He let his own eyes drift away, as if too long a sight of it were too much even for his rawhide nerves.

I stuck with him, trying to get used to it and gulping at my breakfast but not losing it. I kept telling myself that I was safe from it, that it couldn't harm me.

I looked away again and found the Old Man's eyes on me. "How about it?" he said. "Getting hardened to it?"

I looked back at it. "A little." I went on savagely, "All I want to do is to kill it! I want to kill all of them-I could spend my whole life killing them and killing them." I began to shake again.

The Old Man continued to study me. "Here," he said, and handed me his gun.

It startled me. I was unarmed myself, having come straight from bed. I took it but looked back at him questioningly. "Huh? What for?"

"You want to kill it, don't you? If you feel that you have to, go ahead. Kill it. Right now."

"Huh? But-Look here, boss, you told me you needed this one for study."

"I do. But if you need to kill it, if you feel that you have to kill it, do so. I figure this particular one is your baby; you're entitled to it. If you need to kill it, to make you a whole man again, go ahead."

" 'To make me a whole man again-' " The thought rang through my head. The Old Man knew, better than I knew, what was wrong with me, what medicine it would take to cure me. I was no longer trembling; I stood there, the gun cradled in my hand, ready to spit and kill. My master . . .

If I killed this one I would be a free man again-but I would never be free as long as it lived. Surely, I wanted to kill them, every one of them, search them out, burn them, kill them-but this one above all.

My master . . . still my master unless I killed it. I had a dark and certain thought that if I were alone with it, I would be able to do nothing, that I would freeze and wait while it crawled up me and settled again between my shoulder blades, searched out my spinal column, took possession of my brain and my very inner self.

But now I could kill it!

No longer frightened but fiercely exultant I raised the gun, ready to squeeze the trigger.

The Old Man watched me.

I lowered the gun a little and said uncertainly, "Boss, suppose I do kill it. You've got others?"

"No."

"But you need it."

"Yes."

"Well, but-For the love o' God, why did you give me the gun?"

"You know why. This one is yours; you've got first claim. If you have to kill it, go ahead. If you can pass it up, then the Section will use it."

I had to kill it. Even if we killed all the others, while this one was still alive I would still crouch and tremble in the dark. As for the others, for study-why, we could capture a dozen any time at the Constitution Club. With this one dead I'd lead the raid myself. Breathing rapidly, I raised the gun again.

Then I turned and chucked the gun to the Old Man; he plucked it out of the air and put it away. "What happened?" he asked. "You were all set."

"Uh? I don't know. When it got right down to it, it was enough to know that I could."

"I figured that it would be."

I felt warm and relaxed, as if I had just killed a man or had a woman-as if I had just killed it. I was able to turn my back on it and face the Old Man. I was not even angry with him for what he had done; instead I felt warm toward him, even affectionate. "I know you did, damn you. How does it feel to be a puppet master?"

He did not take the jibe as a joke. Instead he answered soberly, "Not me. The most I ever do is to lead a man on the path he wants to follow. There is the puppet master." He hooked a thumb at the parasite.

I looked around at it. "Yes," I agreed softly, " 'the puppet master'. You think you know what you mean by that-but you don't. And boss . . . I hope you never do."

"I hope so, too," he answered seriously.

I could look now without trembling. I even started to put my hands in my pockets, but the shorts had no pockets. Still staring at it, I went on, "Boss, when you are through with it, if there is anything left, then I'll kill it."

"That's a promise."

We were interrupted by a man bustling into the cage room. He was dressed in shorts and a lab coat; it made him look silly. I did not recognize him-it was not Graves; I never saw Graves again; I imagine the Old Man ate him for lunch.

"Chief," he said, trotting up, "I did not know you were in here. I-"

"Well, I am," the Old Man cut in. "What are you doing wearing a coat?" The Old Man's gun was out and pointed at the man's chest.

The man stared at the gun as if it were a bad joke. "Why, I was working, of course. There is always a chance of splattering one's self. Some of our solutions are rather-"

"Take it off!"

"Eh?"

The Old Man waggled his gun at him. To me he said, "Get ready to take him."

The man took his coat off. He stood there holding it and biting his lip. His back and shoulders were bare, nor was there the telltale rash. "Take that damned coat and burn it," the Old Man told him. "Then get back to your work."

The man hurried away, his face red, then hesitated, glanced at me, and said to the Old Man, "Chief, are you ready for that, uh, procedure?"

"Shortly. I'll let you know."

The man opened his mouth, closed it, and left. The Old Man wearily put his gun away. "Post an order," he muttered. "Read it aloud. Make everybody sign for it-tattoo it on their narrow little chests-and some smart Aleck thinks it doesn't apply to him. Scientists!" He said the last word in the way in which Doris had said, "Patients!"

I turned back to looking at my former master. It still revolted me, but there was a gusty feeling of danger, too, that was not totally unpleasant-like standing on a very high place. "Boss," I asked, "what are you going to do with this thing?"