. The origin and evolution of life, on the theory of action, reaction and interaction of energy. orn antelopes {Antiloca-pra) of our western plains. Contemporary with the Hipparionof Pliocene time, adapted to racing over hard, stony ground,is the relatively slow-moving, forest-living horse (Hypohippus)of the river borders of western North America (Fig. 130), inwhich the limb proportions are quite different. There is reason Fig. 129. Horses of Oligocexe Time. The horses frequenting the semi-aridplains of Oligocene times present anintermediate stage in the evokition ofof cursorial motion—Mcsohip
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. orn antelopes {Antiloca-pra) of our western plains. Contemporary with the Hipparionof Pliocene time, adapted to racing over hard, stony ground,is the relatively slow-moving, forest-living horse (Hypohippus)of the river borders of western North America (Fig. 130), inwhich the limb proportions are quite different. There is reason Fig. 129. Horses of Oligocexe Time. The horses frequenting the semi-aridplains of Oligocene times present anintermediate stage in the evokition ofof cursorial motion—Mcsohippus, witha narrow, three-toed type of foot,elongate, graceful limbs, and teeth withcrowns beginning to be adapted to thecomminution of silicious grasses inaccommodation to the contemporane-ous world-wide evolution of grassyplains. This law of the contemporane-ous evolution of an environment ofgrassy plains and of swift-movingHerbivora was first clearly enunciatedby Kowalevsky in 1873. Restorations by Osborn, painted byCharles R. Knight, in the AmericanMuseum of Natural History. e^i^;r>^.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkcscribnerss
