CONTENTS. vii 



PAGE 



227. The nature of the action of the chorda tympani nerve. Influence 



ofatropin .398 



228. The effects on the submaxillary gland of stimulating the cervical 



sympathetic nerve 401 



229. The nervous mechanism of the parotid gland 401 



230. The general features of the secretion of gastric juice . . . 402 

 231. The nervous supply of the stomach. The action of the nerves 



obscure 402 



232. The influence of the absorption of food in promoting secretion . 404 



The changes in a gland constituting the act of secretion. 



233. The appearances presented by the pancreas during secretion ; the 



histological changes 404 



234. The changes in an albuminous gland during secretion . . . 407 



235. The changes in a mucous gland during secretion .... 408 



236. The changes in the central cells of the stomach during secretion . 411 



237. The general nature of secretion. Loading and discharge . . 413 

 238. The formation of the ferment; zymogen, trypsin and trypsinogen, 



pepsin and pepsinogen 413 



239. The nature of the act of secretion itself. The flow of fluid. 'Secretory' 



and 'trophic' fibres 416 



240. The functions of the epithelium of the ducts 418 



241. The formation of the free acid of gastric juice 418 



242. "Peptogenous" food 419 



243. Why the stomach does not digest itself 419 



SECTION IV. 



THE PROPERTIES AND CHARACTERS OF BILE, PANCREATIC JUICE 

 AND Succus ENTERICUS. 



Bile. 



244. The characters of Bile 421 



245. The pigments of Bile. Bilirubin .... 423 



246. The bile salts; glycocholic and taurocholic acids . 423 



247. The action of bile on food 424 



Pancreatic j^lice. 



248. The characters of pancreatic juice . .... 425 



249. The action of pancreatic juice on proteids; leucin, tyrosin. Its 



action on fats and on starch ... . 426 



Succus Entericus. 



250. Nature and action of succus entericus . 430 



251. Gall stones 431 



