DISEASES OF THE HEART AND BLOOD-VESSELS. 



DESCRIPTION OF PLATE. 

 PLATE VII: 



Diagram illustrating the circulation of the blood. The arrows indicate the direc- 

 tion in which the blood flows. The valves of the heart, situated between the 

 right auricle and ventricle, and left auricle and ventricle, and between the 

 ventricles and large arteries, are represented by curved lines. These valves 

 are intended to prevent the flow of blood in a direction contrary to that indi- 

 cated by the arrows. 

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