CONTENTS. ix 



PAGE 



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



of atropin 423 



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



sympathetic nerve 424 



229. The nervous mechanism of the parotid gland 425 



230. The general features of the secretion of gastric juice . . . 425 

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



obscure 426 



232. The influence of the absorption of food in promoting secretion . 428 



The changes in a gland constituting the act of secretion. 



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



histological changes 428 



234. The changes in an albuminous gland during secretion . . . 431 



235. The changes in a mucous gland during secretion .... 432 



236. The changes in the central cells of the stomach during secretion . 435 



237. The general nature of secretion. Loading and discharge . . 437 

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



pepsin and pepsinogen 437 



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



and 'trophic' fibres 440 



240. The functions of the epithelium of the ducts 442 



241. The formation of the free acid of gastric juice 442 



242. "Peptogenous" food . 442 



243. Why the stomach does not digest itself ..... 443 



SECTION IV. 



THE PROPERTIES AND CHARACTERS OP BILE, PANCREATIC JUICE 

 AND Succus ENTERICUS. 



Bile. 



244. The characters of Bile 445 



245. The pigments of bile. Bilirubin 447 



246. The bile salts ; glycocholic and taurocholic acids .... 447 



247. The action of bile on food 448 



Pancreatic Juice. 



248. The characters of pancreatic juice 449 



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



action on fats and on starch 450 



Succus Entericus. 



250. Nature and action of succus entericus 454 



251. Gallstones 455 



F. II. 6 



