The laws and mechanics of circulation, with the principle involved in animal movement . s cut through ; the rootof the right aorta ( is behind that of the left. The relative position of the originsof the three arteries from the chelonian ventricle is shown in Fig. 177, where (P) isthe pulmonary, (-4) the left aorta, (-4) the right aorta—the most posterior, or dorsal,of the three arteries. tain in the heart of chelonia. Then, again, in birds, in whichthe voluntary actions are enormously increased in force, wefind here also that respiration and circulation are in corre-spondence ; otherwise,
The laws and mechanics of circulation, with the principle involved in animal movement . s cut through ; the rootof the right aorta ( is behind that of the left. The relative position of the originsof the three arteries from the chelonian ventricle is shown in Fig. 177, where (P) isthe pulmonary, (-4) the left aorta, (-4) the right aorta—the most posterior, or dorsal,of the three arteries. tain in the heart of chelonia. Then, again, in birds, in whichthe voluntary actions are enormously increased in force, wefind here also that respiration and circulation are in corre-spondence ; otherwise, they could not be produced. It follows,with progress in development in which more and more force iscalled for, that commensurate arrangements must obtain for HEAET AND LUNGS. 429 arterializing and circulating the blood ; hence the differentia-tion of the left cardiac chambers for separating the pulmonicor aerated blood from the systemic venous current, the limi-tation of the arterial or aortal trunk to the left side ofthe heart, the increase in respiratory surface, together Fig. 179.—Abdominal Cavity and Viscera, Draco Volans.—Cyclopediae of Anatomy ;Art. Reptilia. By T. Rymer Jones, a, Ventricle of heart ; b, right auricle ; c, leftauricle ; d, carotid artery ; e, jugular vein ; /, subclavian artery ; g, trachea ; kyliver ; I, lower venous sinus, commencing from liver and extending to right venoussinus ; m, biliary duct ; o, stomach ; p, beginning of small intestine ; q, small intes-tine ; r, beginning of large intestine ; s, its attenuated region ; t, t, kidneys ; u,,cloaca ; v, bladder ; w, anus. the high pressure which obtains in the arterial system for in-creasing circulation in the capillaries and cell-brood, which isgradually brought about in the reptilia and perfected with the-birds. .d the crocodile is the connecting link between thebirds and reptiles, the interventricular septum being perfected 430 CROCODILE CONNECTING LINK WITH THE BIRDS. in the crocodi
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