DIGESTION OF FOOD. 



313 



sels. 9. Stimulation of the terminal ends of the sympathetic 

 and chorda nerves causes a flow of saliva, differing as to total 

 quantity and the amount of contained solids; hut the nerve 

 that produces the more abundant watery secretion, or the re- 

 verse, varies with the animal, e. g., in the cat chorda saliva is 



Part of brain above medulla 



Afferent nerves 

 from tongue - 



•altvary gland 



Blood vessel 

 nf gland 



Pig. 256. -Diagram intended to indicate the nervous mecbanism of salivary secretion. 



more viscid, in the dog less so ; though in aU animals as yet 

 examined it seems that the secretion as a result of stimulation 

 of the chorda tympani nerve is the most abundant ; and in the 



