vi CONTENTS. 



PAGE 



204. Circumstances affecting gastric digestion ; acidity, temperature . 371 



205. The nature of the action of gastric juice. Pepsin . ... . 373 



206. The action of gastric juice on gelatine, chondrin &c. . . . 374 

 The action of gastric juice on milk. Curdling of milk. Casein. 



Bennin 374 



SECTION II. 



THE STRUCTURE OF THE SALIVARY GLANDS, THE GASTRIC Mucous MEM- 

 BRANE, THE PANCREAS AND THE (ESOPHAGUS. 



208. The general plan of structure of the alimentary canal ; mucous, sub- 

 mucous, and muscular coats 377 



The general nature of glands 379 



Structure of the Stomach. 



210. General structure of the stomach 380 



211. The cardiac glands 381 



212. The central or chief cells. The parietal or ovoid cells . . . 383 



213. The connective tissue of the mucous membrane .... 384 



214. The pyloric glands 384 



The Salivary Glands. 



215. The general structure of a salivary gland 385 



216. The characters of mucous cells . 387 



217. The structure of the ducts 388 



218. The structure of albuminous salivary glands 389 



The nervous supply of the salivary glands 390 



The Pancreas. 

 220. The structure of the pancreas 390 



The (Esophagus. 



221. The general plan of structure of the oesophagus. The mucous and 



submucous coats 392 



222. The muscles of the oesophagus 393 



223. The nervous supply of the oesophagus 394 



SECTION III. 



THE ACT OF SECRETION OF SALIVA AND GASTRIC JUICE AND THE NERVOUS 

 MECHANISMS WHICH REGULATE IT. 



The evidences of the existence of a nervous mechanism . . . 395 



225. The nerves of the submaxillary gland 396 



226. The reflex secretion of saliva by means of the chorda tympani 



nerve. .... 396 



