To tambour 



Hook 



. bronchus 



Glass can n ula 

 in trachea 



Liqature on 

 nerves 



Leg 



bone 



(cut) 



Fllunq 



partially 



inflated 



Heart 

 L lunq 

 partially 

 inflated 



Position occupied by hind 

 limbs (removed) 



Fig. 232. A turtle with the brain and spinal cord destroyed and with the plastron 

 and most of the viscera, limbs and skeletal muscles removed to expose freely the partially 

 inflated lungs. A bull-dog is placed on the right bronchus to exclude the right lung 

 from communication with the recording tambour which is connected with the left lung 

 by means of the glass cannula tied in the trachea. The electrodes are shown placed 

 under the left vagus trunk. The heart beats freely. Stimulation of the vagus nerve 

 causes a marked contraction of the corresponding lung. (See Fig. 233 for arrangement 

 of the recording apparatus.) 



