"Well, I don't know. You get them out of bottles. And when the bottles are empty, you send up to the Chemical Store for more. It's the Chemical Store people who make them, I suppose. Or else they send to the factory for them. I don't know. I never did any chemistry. My job was always with the embryos. It was the same with everything else he asked about. Linda never seemed to know. The old men of the pueblo had much more definite answers.