The sun went down just then and a soft, drowsy darkness fell. I thought at first that we'd have to finish our investigation in the dark, but the natives had made provisions for that. A swarm of fireflies as big as robins sailed in from somewhere and circled around over the court, lighting it as bright as day. The Balakian houses made a dim row of flattened shadow-mounds at the outskirts of the circle. A ring of natives sat tailor-fashion on the ground in front of them--a neat trick considering that they had three legs each to fold up--and grinned at us. They had waited twenty-two years for this show, and now that it had come they were enjoying every minute of it. * * * * * Our investigation was pretty rough going. The fireflies overhead all circled in one direction, which made you dizzy every time you looked up, and besides that the Quack had remembered that he was a prisoner in an alien environment and was at the mercy of any outlandish disease that might creep past his permanent immunization. He muttered and grumbled to himself about the risk, and his grousing got on our nerves even worse than usual. I moved over to shut him up, and blinked when I saw him pop something into his mouth. My first guess was that he had managed to sneak some food concentrate out of the ship somehow, and the thought made me realize how hungry I was. "What've you got there, Quack?" I demanded. "Come on, give--what are you hiding out?" "Antibiotics and stuff," he answered, and pulled a little flat plastic case out of a pocket. It was his portable medicine chest, which he carried the way superstitious people used to carry rabbits' feet, and it was largely responsible for our calling him the Quack. It was full of patent capsule remedies that he had gleaned out of his home medical book--a cut thumb, a surprise headache, or a siege of gas on the stomach would never catch the Quack unprepared! "Jerk," I said, and went back to Gibbons and Corelli, who were arguing a new approach to our problem. "It's worth a try," Gibbons said. He turned on the two Haslops, who were bristling like a pair of strange dogs. "This question is for the real Haslop: Have you ever been put through a Rorschach, thematic apperception or free association test?" The real Haslop hadn't. Either of them. "Then we'll try free association," Gibbons said, and explained what he wanted of them. "_Water_," Gibbons said, popping it out quick and sharp. "Spigot," the Haslops said together. Which is exactly what any spaceman would say, since the only water important to him comes out of a ship's tank. "Lake" and "river" and "spring," to him, are only words in books. Gibbons chewed his lip and tried again, but the result was the same every time. When he said "payday" they both came back "binge," and when he said "man" they answered "woman!" with the same gleam in their eyes.