. Physiology, experimental and descriptive . be caught by the pan. Place the funnels in therings. Lay the heart, now wholly severed from the lungs, onits ventral surface. Connect one funnel by rubber and glasstubing, with the left auricle by the tube already in the pul-monary vein; connect the other funnel with the right auricle,through the precaval vein; ligature the postcaval vein. Laythe heart in a basin, and pour water into the funnels; holdthe heart with the two hands, and compress it, repeatedlyadding water. In this way the clotted blood usually presentin the right ventricle may be washe
. Physiology, experimental and descriptive . be caught by the pan. Place the funnels in therings. Lay the heart, now wholly severed from the lungs, onits ventral surface. Connect one funnel by rubber and glasstubing, with the left auricle by the tube already in the pul-monary vein; connect the other funnel with the right auricle,through the precaval vein; ligature the postcaval vein. Laythe heart in a basin, and pour water into the funnels; holdthe heart with the two hands, and compress it, repeatedlyadding water. In this way the clotted blood usually presentin the right ventricle may be washed out. If this remain,it may interfere with later experiment. Connect the aorta 64 ACTION OF THE HEART. with the funnel which leads to the right auricle by meansof a glass tube which bends over the edge of the funnel, thusholding itself in place by the hook, or held above by a clampor ring, and emptying into this funnel any liquid whichescapes f roni the tube. In like manner have a bent glass tube, from the pulmonary Capillariesof the Lungs. Capillariesof the Body Fig. 19. Demonstration of the Action of the Heart (Heart Diagrammatic-) artery, held by a clamp above the funnel leading to the leftauricle. If possible, let the heart soak in water over night beforeshowing it to the class. This will loosen the clots, and makethe valves more flexible. Pour water into one of the funnels, and compress the heartto imitate its natural contraction; observe where the liquid INJECTION OF THE ARTERIES. 65 next appears ; add more water, and follow it around to itsstarting-point. A little ink may be peured into one of thefunnels, and traced around, as the heart is worked, to itsstarting-point. That there is no direct connection between the two halvesof the heart may be shown by letting the liquid from eachartery empty into the funnel connected with the auricle of thesame side of the heart. Different-colored liquids may be usedin the two funnels. In order to illustrate more fully how the heart i
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