CONTENTS xiii 



SECTION III. (continued) PAGE 



Pancreatic juice --.-.. 352 



Bile - - - 357 



Succus entericus - . 364 



SECTION IV. SECRETION OF THE DIGESTIVE JUICBS MICRO- 

 SCOPICAL CHANGES IN THE GLAND CELLS - 368 

 Changes in pancreas and parotid during secretion - - 369 

 Changes in gastric glands during secretion ... 37! 

 Changes in mucous glands during secretion - 375 

 Mode of formation of the digestive juices - - - 377 

 Why the tissues of digestion are not affected by the digestive 



ferments - - 382 

 SECTION V. INFLUENCE OF THE NERVOUS SYSTEM ON THE 



DIGESTIVE GLANDS - - 385 



Influence of nervous system on salivary glands - - 385 



Influence of nervous system on gastric glands - - 39* 



Influence of nervous system on the pancreas - 399 



Secretin . - 401 



Influence of nervous system on secretion of bile - 405 

 Influence of nervous system on the secretion of intestinal 



juice . 4 o8 



Secretion of the digestive juices (summary) - 409 



SECTION VI. SURVEY OF DIGESTION AS A WHOLE - - 410 

 Reaction of intestinal contents . -414 



Bacterial digestion - - - - 416 



Faeces 4l8 



CHAPTER VII. 

 ABSORPTION. 



SECTION I. PRELIMINARY PHYSICO-CHEMICAL DATA - . 420 



Imbibition, diffusion, and osmosis - - 420 



Electrolytes - - - . 22 

 Surface tension - - - . . -423 

 Adsorption - - - . . -424 



SECTION II. MECHANISM OF ABSORPTION - . 425 

 Theories of absorption . -427 

 Permeability of intestinal epithelium- - -431 



Absorption from the peritoneal cavity - . 433 



SECTION III. ABSORPTION OF THE VARIOUS FOOD SUBSTANCES - 435 



Absorption of fat . . . - 435 



Absorption of carbo-hydrates - 439 



Absorption of water and salts - 440 



Absorption of proteins - 441 



