REPARATOKY INFLAMMATION IN ARTERIES. 41 



diately preceding, that there is a rich capillary plexus extend- 

 ing from the bottom to the top of the plastic clot, d, d', is 

 a blood-clot showing the serpentine lamellation and exhibit- 

 ing no sign of approaching organization or degeneration. It 

 has been uplifted from its original position by the growth of 

 the plastic clot. g. Fibrous filaments which probably served 

 the function of bands of union between the clot and the arte- 

 rial walls when the former was first deposited. At present the 

 l)lood-clot has no attachment except at its base, where, with 

 considerable firmness, it is united to a cellular mass (A) which 

 itself is an outgrowth from the intima and from the top of the 

 vascularized clot. This cellular mass (A) is permeated by 

 large cliannels through which blood can freely pass. L. Open 

 lumen of the artery. 



Second Series — The second series of experiments was 

 instituted with the object of learning, if possible, what pro- 

 portional part those wandering cells which may have reached 

 the interior of the ligated artery, through the ruptures in the 

 intima caused by the ligature, may have borne in the healing 

 process as above described. 



The sections from all of these preparations presented very 

 uniform pictures. Each one showed the presence of two dis- 

 tinct blood-clots ; the one above the point of compression by 

 the forceps, the other between that point and the position of 

 the ligature. At the same time they demonstrated the fact that 

 these double blood-coagula were similar in constitution to those 

 stratified clots found after the usual application of the ligature. 

 They further showed that up to ten days there was no dispo- 

 sition in them to organize. The preparation five days old ex- 

 hibited below the bottom of the lower blood-clot a very slight 

 accumulation of plastic material. The cells of which the latter 

 consisted were in the main similar to leucocytes, which had 

 probably wandered in through the laceration in the coats 

 produced by the ligature. Besides these, and confined mostly 



