EEPARATORY INFLAMMATION IN ARTERIES. 45 



properl}^ done, by means of tlie twisting forceps, the external 

 tunic of tlie vessel is formed into a kind of knot, so to speak, 

 while the middle and inner coats are separated from the adven- 

 titia for a slight distance, and are curved inward, thus forming 

 a more or less perfect valve a small distance below the point of 

 seizure by the limiting forceps. By pressure of the limiting 

 forceps the internal tunic of the artery is rubbed together a 

 little distance above the end of the arterial stump, as in tlie 

 operation for tlie second series. This is the point where the 

 healing process is again most active, where the granulations 

 spring from the proliferating intima, and w^here, by the union 

 of the latter and the subsequent changes which have already 

 been mentioned, the lumen of the vessel is first permanently 

 closed. 



In the space below the point of compression by the limiting 

 forceps (that part of the lumen of the artery included between 

 the point of compression above and the incurved walls below) 

 there was the same fibrinous clot having a serpentine lamella- 

 tion and showing no signs of organization, and immediately 

 below it) the same accumulation of colorless cells represented 

 at p just above the ligature in Fig. 9. 



The incurved media was earl}^ infiltrated with a great num- 

 ber of cells, and the twisted adventitia still more abundantly 

 showed this infilti'ation. 



The healing in these cases seemed to progress with about the 

 same rapidity as in cases forming the second series. 



Fourth Series.— The fourlh series of experiments was 

 directed toward the determination of the sequence of phenom- 

 ena after the flow of blood in nn artery has been arrested by 

 the temporary nse of the needle. As was previously stated, 

 the third and fourth methods of flpplying acupressure were 

 followed. The number of preparations constituting this series 

 was also somewhat limited. An exmnination of the few made 

 has led to the conviction that the process of healing after aeu- 



