REPARATORY INFLAMMATION IN ARTERIES. 57 



consequence of the slowness of the healing process present in 

 acupressure, either limited torsion, simple ligation, or the 

 modified ligation above described, would seem in general more 

 reliable. See Fig. 10. 



18th. By the compression of an artery for a few hours be- 

 tween the arms of a pair of forceps or of a serre-fine applied 

 directly to the vessel-walls, an inflammation may be excited 

 through the agency of which the lumen of an artery may be 

 permanently obliterated. This inflammatory process does not 

 diSer materiall}'^ from that which is present after simple acu- 

 pressure. "This procedure should, a priori, be peculiarly use- 

 ful when the vessel-walls are diseased, as in atheroma or in 

 aneurism. 



19th. The organizing elements which are active in the heal- 

 ing of arteries are neither the white blood-corpuscles which 

 are a part of the fibrinous clot at the time of its formation, 

 nor those which may wander into it afterward ; nor are they 

 principally the so-called white corpuscles of the blood and 

 their progeny, which may have wandered into the plastic clot. 



20th. The so-called wandering cells, which may be found in 

 any part either of the plastic or of the blood clot, seldom, if 

 ever, reach their destination by escaping from the vasa vasorum 

 and passing directly through the vessel-walls. 



21st. The endothelium which lines the inner surface of the 

 arteries and capillaries may be considered the source of origin 

 of some of the increased number of colorless elements of the 

 blood in local inflammation. From this conclusion naturally 

 issues the corollary, that the endothelia in general may be con- 

 sidered as some of the possible physiological progenitors of 

 the colorless elements of the blood. See Fig. 11. 



22d. In the inflammatorj' processes through the agency of 

 which an artery is healed after ligature, acupressure, or torsion, 

 the stable cells of the tunica intima play a very important — 

 probably the most important role. 



