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Some Early Mammals and the Story of the Horse

"Geology, in the magnitude and sublimity of the objects of which it treats, ranks next to astronomy in the scale of the sciences."-Sir JOHN F. W. HERSCHEL.

It has often been said that the Primary era was an "Age of Fishes," the Secondary era an "Age of Reptiles," and the Tertiary an "Age of Mammals." There is, however, a danger lest beginners should be deceived by broad statements of this kind, which must not be pressed too far. All that is meant in this case is, that, first of all, fishes were the dominant type; then reptiles, and then mammals.