VASCULAR SYSTEM. 117 



collected, which recognises the marked difference between 

 vital and textural properties. 



Q. Give an example of longitudinal arterial contrac- 

 tility. 



Jl. When an artery is cut across it retracts. 



Q. In what surgical operation is this kind of contrac- 

 tility conspicuous? 



Ji. The retraction of the spermatic artery is remarkable 

 when the cord is cut in extirpation of the testicle. 



Q. How is this contractility of the artery to be over- 

 come? 



Ji. Tie the artery before the vas deferens is cut; and 

 then it does not retract within the ring. 



3. Vital Properties. 



Q. Do the arteries possess animal sensibility? 



Ji. Experiments frequently and variously made prove 

 that they do not. 



Q. What nerves supply the arteries? 



/?. The nerves of organic life. 



Q. Is animal contractility a property of the arteries? 



ft. Experiments made on the brain and spinal marrow 

 with a view to ascertain this point prove, that injuries of 

 these organs, while they excite the animal contractility 

 into convulsive action, do not influence the arteries at all: 

 even galvanism failed to do so. 



Q. What medical doctrine do these experiments con 

 tradict? 



/?. The doctrine of the influence of the brain on the 

 arteries. 



