. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . FIG. 111.—Foot changes in evolution ofthe horse: a, Equus, Quaternary (re-cent) ; b, Pliohippus, Pliocene; c, Pro-tohippus, Lower Pliocene; d, Miohip-pus, Miocene; e, Mesohippus, LowerMiocene; /, Orohippus, Eocene. (AfterFIG. 254 of Animal Studies.) 178 EVOLUTION AND ANIMAL LIFE ments or splints. This animal differs from the present horsesomewhat in skull, shape of hoof, length of teeth, and otherminor details. Lastly came the present horse, Equus, with t

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. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . FIG. 111.—Foot changes in evolution ofthe horse: a, Equus, Quaternary (re-cent) ; b, Pliohippus, Pliocene; c, Pro-tohippus, Lower Pliocene; d, Miohip-pus, Miocene; e, Mesohippus, LowerMiocene; /, Orohippus, Eocene. (AfterFIG. 254 of Animal Studies.) 178 EVOLUTION AND ANIMAL LIFE ments or splints. This animal differs from the present horsesomewhat in skull, shape of hoof, length of teeth, and otherminor details. Lastly came the present horse, Equus, with thesplint bones or concealed rudiments of the side toes very smalland the hoof of the middle toe rounder. In spite of the greatdifference between the one-toed foot of the living horse andthe dogs five-toed foot there was once a kind of horse whichhad a five-toed foot, and there is after all a close relationshipbetween the foot of the horse and the foot of the

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