viii CONTENTS. 



PAGE 



204. Circumstances affecting gastric digestion ; acidity, temperature . 395 



205. The nature of the action of gastric juice. Pepsin .... 396 



206. The action of gastric juice on gelatin, chondrin &c. ... 397 

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



Kennin 398 



SECTION II. 



THE STRUCTURE OF THE SALIVARY GLANDS, THE GASTRIC Mucous 

 MEMBRANE, THE PANCREAS AND THE (ESOPHAGUS. 



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

 mucous, and muscular coats . 401 



The general nature of glands 403 



Structure of the Stomach. 



210. General structure of the stomach 404 



211. The cardiac glands 405 



212. The central or chief cells. The parietal or ovoid cells . . . 406 



213. The connective tissue of the mucous membrane .... 408 



214. The pyloric glands 408 



The Salivary Glands. 



215. The general structure of a salivary gland 409 



216. The characters of mucous cells 411 



217. The structure of the ducts 412 



218. The structure of albuminous salivary glands 413 



219. The nervous supply of the salivary glands 414 



The Pancreas. 



220. The structure of the pancreas 414 



The (Esophagus. 



221. The general plan of structure of the O3sophagus. The mucous and 



submucous coats 416 



222. The muscles of the oesophagus 417 



223. The nervous supply of the oesophagus 418 



SECTION III. 



THE ACT OF SECRETION OF SALIVA AND GASTRIC JUICE AND THE 

 NERVOUS MECHANISMS WHICH REGULATE IT. 



224. The evidences of the existence of a nervous mechanism . . . 419 



225. The nerves of the submaxillary gland 420 



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



nerve . 420 



