CHAPTER XI. 



Lymph 

 Duct 



ABSORPTION DIGESTION COMPLETED. 



Absorption. The mucous membrane of the small 

 intestine is thrown into ridges, but, unlike those of the 

 stomach, they 

 run transversely. 

 Again, while the 

 folds in the lining 

 of the stomach 

 are temporary, 

 these are perma- 

 nent. They serve 

 to increase the 

 surface of the lin- 

 ing, and to retard 



the passage Of the Mesenterlc 

 . - . Lymph Veins 



food material, and (Fats) 

 so to aid the pro- 

 cess of digestion 

 and of absorption. 



Villi. Fur- 

 ther, the surface 

 of the mucous 

 membrane of the 

 small intestine is thickly beset with little cylindrical pro- 

 jections, like the " pile " on velvet. These projections are 



181 



Lymph 

 Glands """. 



Lacteal s 



Fig. 65. Plan of Absorption. 



