ADVANCED EXPERIMENTAL PHYSIOLOGY 167 



dilate and emission of urine and faeces takes place. The veins 

 are congested with black blood. 



FIG. 158. Record of arterial pressure (AP) and plethysmogram of limb 

 (volume record LV). Excitation of the depressor nerve at signal A. 

 The limb expanded in spite of the fall of arterial pressure. 



The time is marked in seconds. (Bayliss.) 



3rd stage : The inspirations, which have occurred at longer and 

 longer intervals, finally cease. The heart beats slowly and with 



FIG. 159. Arterial pressure ; effect of asphyxia. Animal anaesthetised 

 and curarised. At A the artificial respiration was stopped. The large 

 oscillations are Traube-Hering curves. (L.H.) 



great force. Finally the heart beat is accelerated, and the blood 

 pressure falls to zero. 



