MOTION OF THE HEART AND BLOOD 



and function of the heart and arteries must seem 

 obscure, inconsistent, or impossible to the thought- 

 ful student. It will therefore be proper to investigate 

 the matter more closely, to study the movement of 

 the heart and arteries not only in man but in all 

 animals possessing a heart, and to search out and 

 find the truth by frequent experiments in living 

 animals, and by constant observation. 



23 1 



