"Well, yes, and no," said Hugh. "The horns look like real horns, that is to say, they seem to be made of horny matter, but they don't always grow on the head. Sometimes they grow on the neck, sometimes in the forehead. I've heard of cases where there were four or five growing on different parts of the animal's body. I never saw more than two on one animal, one of them grew out of the top of his head and another from the side of his neck."
"Well," said Jack, "that beats me entirely."
"This whole business of horns," said Hugh, "is something that, as I say, I don't understand. Now, of course, we know that a deer sheds his horns every spring or winter, and that an antelope sheds his horns every autumn, but, of course, the way an antelope sheds his horn is very different from the way a deer sheds his, just as an antelope horn is different from a deer's horn. I was talking about this with your uncle one time and he told me that the antelope was the only animal that had a bony core to the horn that regularly shed the horn, but, as I say, the antelope don't shed his whole horn, like the deer; the sheath that covers the horn core just slips off. When it slips off you find the core of the horn covered with skin and all over this skin grow long, white hairs, except at the very top, where there's a little black knob of horn. After the sheath has been shed, the skin and the white hairs covering it seem gradually to turn into the black horn, the change traveling down from the tip of the horn to the animal's head. Often at the base of the horn you can see where the hairs of the head join the horn and seem to be mixed up with it. In other words, there's a place where the horn sheath is part horn sheath and part antelope skin and hair. Your uncle once told me that hair, horns, hoofs, scales, nails, claws, and feathers were all different forms of the same thing, and it seems to me that in the antelope's horn sheath and the way it changes from the time the old sheath is shed until the new sheath is formed we can see hair changing into horn."
"Of course, it's easy to see," said Jack, "that horn and nails and hoofs are the same thing; they are just the same substance put on different parts of the body. I can understand, too, how feathers are the same, because we can look at the quill of a feather and see that that isn't very different from the fingernail or the claw of a small animal, but scales seem to me a little different."
"Well, I don't know," said Hugh. "You take the scales of a beaver or a muskrat tail, and in places they're all mixed up with the hair, and the hair seems gradually to change into scales. Look at a beaver's foot and you'll see the same thing going on. Anyway, I guess if your uncle said that was so, it is so, for I don't think he's the kind of a man to talk positively about things that he doesn't know of."
"No, indeed, he isn't, Hugh, and he knows a whole lot, and yet, you'd never find it out unless you get talking to him and asking him questions about things."
"That's so," said Hugh. "He's a mighty quiet man, but he knows a heap."