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Plate No. 3. 



THE HEART VIEWED EXTERNALLY. 



a, the left ventricle ; b, the right ventricle ; c, e, f, the aorta ; g, h, i, the carotid 

 and other arteries springing from the aorta ; k, the pulmonary artery ; I, branches 

 of the pulmonary artery in the lungs ; m, m, the pulmonary veins emptying into the 

 left auricle ; n, the right auricle ; o, the ascending vena cava ; q , the descending 

 vena cava ; r, the left auricle ; s, the coronary vein and artery. See Circulation 

 OP the Blood, on the opposite page. 



