140 VASCULAR SYSTEM. 



blood is evacuated externally ; this is a species of the first 

 form. 



Q. What is an aneurismal varix? 



#. The case where there is an abnormal direct com- 

 munication between the artery and vein. 



Q. How are contractions of the veins induced? 



#. By chronic inflammation and thickening of the ve- 

 nous parietes. 



Q. Where are venous concretions seen? 



#. They have been seen in the pelvic veins, about the 

 size of a pea. 



Q. What great difference is there in the pathological 

 tendencies of the internal membrane of the veins and that 

 of the arteries? 



#. The venous is not disposed to ossify, the arterial is, 



