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The second of these types is the Hyracotherium. In size it must have been something like the rabbit or the hyrax. It had only three toes on its hind feet, and four on its front feet; though it had also a splint-bone, representing the shrunken and discarded fifth toe, on its fore feet. The teeth, and the bones and joints of the limbs, are also developing in the direction of the horse.
Each of these hoofs is connected with a splint-bone which has in some way suddenly become reminded of its ancient use, and develops in a manner to imitate the creatures which passed from the earth millions of years ago. In most cases the splint-bones have no function whatever to perform.
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