64 



ACTION OF Till': HEART. 



with the funnel which leads to the right auricle by means 

 of a glass tube which bends over the edge of the funnel, thus 

 holding itself in place by the hook, or held above by a clamp 

 or ring, and emptying into this funnel any liquid which 

 escapes from the tube. 



In like manner have a bent glass tube, from the pulmonary 



Capillaries 

 of the Lungs 



Capillaries 

 of the Body 



Fig. 19. Demonstration of the Action of the Heart (Heart Diagrammatic.) 



artery, held by a clamp above the funnel leading to the left 

 auricle. 



If possible, let the heart soak in water over night before 

 showing it to the class. This will loosen the clots, and make 

 the valves more flexible. 



Pour water into one of the funnels, and compress the heart 

 to imitate its natural contraction; observe where the liquid 



