THE DIGESTION OF FOOD 



material obtained 

 from the food and 

 pours it into the blood 

 current at the junc- 

 tion of the great veins 

 on the left side of the 

 head with those of the 

 left arm (Fig. 103). 



The remaining 

 lymphatics, chiefly 

 those on the right 

 side, are connected 

 with the great veins 

 of the right side. 



168. The Work 

 done by the Lymphat- 

 ics. In nearly every 

 tissue of the body 

 there is a marvelous 

 network of vessels, 

 precisely like the lac- 

 teals, known as the 

 lymphatics. They seem 

 to start out of the part 

 in which they are 

 found, like the root- 

 lets of a plant in the 

 soil. The tiny roots 

 join together and 

 make larger roots. 

 They carry a fluid 

 called lymph, very 





FIG. 78. BLACKBOARD SKETCH. 

 Diagram of a Transverse Section of the 



Small Intestine. 



In the figure on the left are seen the artery and vein 

 of a villus. In the right figure are represented 

 the central lacteal of villus, with plexus of lymph 

 vessels at the base. The mucous, submucous, 

 muscular, and serous coats are indicated at the 

 base of the right-hand figure. The epithelium of 

 each villus is well shown. 



