EXTRACT II. A. 



ON CIRCULATION GENERALLY, AS IT IS TO BE MET 

 WITH IN THE HUMAN BODY AND IN THE 

 ECONOMY OF LIFE. 



CIRCULATION, regarded from an anatomical point of view, 

 is commonly applied to the movements of the blood within 

 its containing vessels, and is accomplished as is described 

 by its immortal discoverer, Harvey by muscular agency, 

 resident within the walls of the heart and arteries. 



Circulation, however, in its widest, minutest, and physio- 

 logical sense, can be seen in all parts of the body, originating 

 from, and terminating in, the blood circulation, as well as 

 in the glands and viscera, and on the free surfaces of the 

 body, internal and external. 



Thus, the alimentary circulation may be described as the 

 primary or central preparatory circulation, or that by which 

 the food, solid and liquid, is made available for the main- 

 tenance of the body, the alimentary canal being at once 

 the disintegrating, dissolving, circulating, and absorbing 

 medium by which the chyme and chyle reach the blood 

 stream, where they are transmuted and transformed into 

 blood proper. 



This primary circulation is supplemented by the aerial 

 circulation, which is effected through the breathing 

 apparatus. 



The next circulation to be mentioned in this connection 

 is the lymphatic, a circulation concerned mainly in the 

 process of collecting the products of tissue waste and of 

 escaped liquor sanguinis^ or blood plasma. These modes 

 of circulation are concerned in the maintaining of the life 



