166 ELEMENTARY PHTSIOLOGT. [XV. 



13. Add a little raw starch' to saliva and place in 

 the warm chamber, shaking frequently. The 

 raw starch is converted into sugar very slowly, it 

 may be an hour or more before any sugar can be 

 detected. 



DEMONSTRATION. 



Effect on the submaxillary gland of the dog of 

 stimulating the chorda tympani and the sympa- 

 thetic nerves. 



* Arrow-root will do very weU. 



