204 



EXPERIMENTAL PHYSIOLOGY 



manner. The effect of section of the first vagus may be nil, no change 

 either in rate or depth occurring ; or there may be slight slowing 



Fig. 161 Effect upon Eespiration of Stimulation of the Glossopharyngeal- 



Nerve : i, by Making the Animal Swallow Water ; n, by Tetanisation of 

 the Nerve. 



Fig. 162. 



-Result of Section of the Vagus, the other Nerve having 

 been Previously Divided. 



accompanied by an increase in depth. The effect of section of 

 the second vagus (fig. 162) is always to diminish the rate and increase 



