Digestion in the Intestine. 177 



The shaking breaks the oil into fine drops, which would 

 soon gather again if no other substance were present ; but 

 the albumen forms a thin coating around each droplet, 

 enabling it to remain distinct in the liquid. 



The Intestinal Glands. The mucous membrane of the 

 small intestine has an immense number of tube-like glands. 

 (See Fig. 78.) Their structure is 

 much like that of the gastric glands 

 shown in Fig. 73. Fig. 75 shows 

 them as seen when cut across. 

 These glands make a liquid called 

 intestinal juice, which completes the 

 work of the other digestive liquids. 



Review of Digestive Liquids. - 



Saliva acts only on starch, gastric 

 juice on proteids, bile on fats; but 

 pancreatic juice acts on all three. the intestine, showing intestinal 



Glands in Transverse Section. 

 T A r^, . (Highly magnified.) 



The Large Intestine. This con- 

 sists mainly of the colon, the final portion being called the 

 rectum. 



The Colon. The small intestine joins the colon near the 

 lower right side of the abdomen. Where the small intes- 

 tine enters the colon there is a valve which keeps the 

 material from coming back into the small intestine. The 

 colon runs upward on the right side (ascending colon), 

 crosses over to the left side (transverse colon), and descends 

 on the left side (descending colon), and, after curving some- 

 what like a letter S, becomes straight again, this part being 

 called the rectum. It is well to know the course of the 

 lower bowel, as pressure may be so applied as to push the 

 contents along in case the bowels become torpid. (Fig. 76.) 



