186 



DIGESTION. 



by the digestion of albuminous matters ; 2d. A chylous fluid, from the 

 emulsion of the fats ; and 3d. Glucose, produced by the transformation 



Fig. 53. 



Fig. 54. 



FROM DUODENUM OF DOG, DURING 

 DIGESTION OP MEAT. a. Fat vesicle, 

 with its contents diminishing. The vesicle 

 is beginning to shrivel and the fat breaking 

 up. 6, 6. Disintegrated muscular fibre, c, c. 

 Oil globules. 



FROM MIDDLE OF SMALL INTESTINE. 

 a, a. Fat vesicles, nearly emptied of their 

 contents. 



of starch. These substances are then ready to be taken up into the cir- 

 culation : and as the mingled ingredients of the intestinal contents pass 



successively downward through 



Fig. 55. the intestine, the products of di- 



gestion, together with the diges- 

 tive secretions themselves, are 

 gradually absorbed by the vessels 

 of the mucous membrane, and 

 carried away by the current of the 

 circulation. 



The Large Intestine and its 

 Contents. 



The mucous membrane of the 

 large intestine is abundantly pro- 

 vided with tubular glandules 

 which are not essentially differ- 

 ent, in their anatomical charac- 

 ters, from the follicles of Lieber- 

 ktihn. Their secretion, however, 

 appears to be comparatively 



scanty, at least in the watery and albuminous ingredients which are 

 present in the other intestinal juices. According to Ranke, fistulous 

 openings in the large intestine do not yield any notable quantity of 



FROM LAST QUARTER OF SMALL IN- 

 TESTINE. a, a. Fat vesicles, quite empty and 

 shrivelled. 



