The laws and mechanics of circulation, with the principle involved in animal movement . inhibiting the downward move-ment in the floor of support to the viscera for facilitating lung-diastole, the organs being compelled to act upon a horizontalplane in a to-and-fro movement upon the viscera. At the sametime, however, it involves independent automatic action in thelungs, for in no other way could the air be effectively diffusedthrough the alveolar compartments in the measure of the phy- * This was done in London, that would not suffer physiological investiga-tions, its heart too tender. All the
The laws and mechanics of circulation, with the principle involved in animal movement . inhibiting the downward move-ment in the floor of support to the viscera for facilitating lung-diastole, the organs being compelled to act upon a horizontalplane in a to-and-fro movement upon the viscera. At the sametime, however, it involves independent automatic action in thelungs, for in no other way could the air be effectively diffusedthrough the alveolar compartments in the measure of the phy- * This was done in London, that would not suffer physiological investiga-tions, its heart too tender. All the same, I made it out there ; this and frog-respiration, with other important matters, all-pervading Intelligence blessingthe time and place. 420 EFFECT UPON CAKDIAC DEVELOPMENT. siological requirements. Cut the point we wish to make in thisconnection, is the effect produced by this embarrassed respira-tion upon cardiac development, since it throws more labor uponthe heart. This circumstance is seen in the great increase inthe muscles of the heart (Fig. 175, A), the walls of the ven-. Fig. 175.—The Viscera in the Tortoise (Emys Europced), as viewed from below.—Bojamis. A, heart (ventricle) ; A, aorta ; B, right auricle ; B, left auricle ; B,left aorta ; C, common pulmonary artery ; D, right subclavian artery ; E, trachea ;E\ left ; E, right carotid arteries ; i, jugular ; h, brachial veins ; e, g, vertebraland subclavian veins ; T, T, oesophagus ; K, stomach, nearly covered by the liver ;K, pylorus ; 7, J, liver ; Z, Z, lungs ; 31, oviducts ; iV, ovaries ; V, intestine ; £7,urinary bladder ; U, U, anal bursse ; X, cloaca opening. tricle being much thicker comparatively than in other animals(Figs. 176, ] 77). That this, together with the sluggish movementsof the animal, is due to defective action in the lungs, has forci-ble proof in the case of the flying lizard (Fig. 179), in which EFFECT UPON CAEDIAC DEVELOPMENT. 427 respiration is free, the movements energetic, the heart
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