Page:Popular Science Monthly Volume 84.djvu/341

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The child, learning that the horse walks on the tips of the middle fingers and the middle toes, becomes fascinated with the story of the evolution of this animal, through thousands of generations, from a small mammal about the size of a dog, which had five fingers on each hand and five toes on each foot.

In our excursions to the asphalt fossil beds of Rancho La Brea, down