THE DIGESTIVE AND EXCRETORY SYSTEMS 99 



contraction of the bladder and rectum and the 9th may 

 have little or no effect. 



If the stimulation is stopped immediately contraction 

 begins, the effect can be obtained a number of times. 

 Note that the contraction of the bladder is entirely, or 

 almost entirely, confined to the side on which the nerve 

 is stimulated. Cut and stimulate the 9th nerve on the 

 opposite side. 



DEMONSTRATIONS. 



1. The effect of stimulating the chorda tympani on 

 the flow of saliva. 



2. The chyle in the lacteals of a rabbit a few hours 

 after a meal. 



3. Passage of urine from the pelvis of the kidney to 

 the bladder. 



