NUTRITION PROPER. 



327 



where. That taken up by the lacteals is carried by the 

 lacteal or lymphatic vessels of the mesentery through 

 the mesenteric glands into the receptaculum chyli, and 

 thence up to the thoracic duct, the lymphatic trunk 

 lying along the backbone on the left side (Fig. 209). 

 This duct rises to the collar bone, then turns downward 

 and empties into the angle formed by the junction of 



01/ c 



Qvc 



Fig. 209. — A segment of the intestines (i), showing the lacteal vessels pass- 

 ing along the mesentery (m), through the mesenteric glands (ingl), and 

 into the thoracic duct (thd ) : avc, ascending vena cava. 



the subclavian vein from the left arm and the jugular 

 coming from the head, and thence it passes by the vena 

 cava descendens directly to the heart, to be distributed 

 to the whole body. This will be explained more fully 

 hereafter. 



Sanguification. 



In the course of each of these to the general circu- 

 lation there are certain changes which assimilate it to 



