. The origin and evolution of life, on the theory of action, reaction and interaction of energy. iomimus {Ornithomimus), after Osborn. its toothless jaw sheathed in horn. In this animal the car-nivorous habit is completely lost; it is secondarily herbivorous. Its limbs are adapted tovery rapid motion. In the meantime thetrue carnivorous dinosaurline was evolving overthe entire northern hemis-phere stage by stage withthe evolution of the variedherbivorous group of thedinosaurs. These animalspreserved perfect me-chanical unity in the evo-lution of the very swiftmotions of the hind limband prehen
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. iomimus {Ornithomimus), after Osborn. its toothless jaw sheathed in horn. In this animal the car-nivorous habit is completely lost; it is secondarily herbivorous. Its limbs are adapted tovery rapid motion. In the meantime thetrue carnivorous dinosaurline was evolving overthe entire northern hemis-phere stage by stage withthe evolution of the variedherbivorous group of thedinosaurs. These animalspreserved perfect me-chanical unity in the evo-lution of the very swiftmotions of the hind limband prehensile powersboth of the jaws and ofthe hind feet, adapted toseizing and rapidly over-coming a strugglingpowerful prey. This seriesreaches an astoundingclimax in the giganticTyrannosaurus rex, de-scribed by Osborn fromthe Upper Cretaceous ofMontana (see frontis-piece). This king of the tyrant saurians is in respect tospeed, size, power, and ferocity the most destructive lifeengine which has ever evolved. The excessively small size ofthe brain, probably weighing less than a pound, which is less. Lateral view of the tyrant dinosaur, Tyran-nosaurus (left), and the ostrich dinosaur,Slruthiomimus (right), to the same scale. Fig. 92. Extremes of Adaptation in theTyrant and the Ostrich Dinosaurs. Skeletons mounted in the American Museum ofNatural History. CARNIVOROUS DINOSAURS 215 than I /4000 of the estimated body weight, indicates that inanimals mechanical evolution is quite independent of theevolution of their intelligence; in fact, intelligence compensatesfor the absence of mechanical perfection. Tyrannosaums is ^^(f? y^<^
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