44 THE TONER LECTURES. 



section, a blood-clot similar to d fell out from the position, 

 L. This clot was adherent, though not very strongly, to the 

 top of ^", and it had no lateral attachment whatever. 



On a level with B the enormously thickened intima, p', 

 and the growing inner layers of the media are more or less 

 blended. Large granulations arise from this tissue and project 

 inward, entirel}^ obliterating the lumen. The}' often meet and 

 unite, foi-ming a trabecular network with very small narrow 

 interstices through which flows the blood ; p" consists of 

 such a trabeculated mass. The structure of the granulations 

 themselves is cellular, in fact identical with those granulations 

 which form the plastic clot after the ordinary ligature, v. 

 Capillary vessels and small blood canals in the inner la^'er of 

 the media and the thickened intima : they are in communica- 

 tion with the intertrabecular spaces ; the latter open into the 

 lumen of the artery-, and receive and return their blood thence, 

 e. Position of elastic limiting layer between the intima and 

 media. Only traces of this elastic layer, however, can be dis- 

 covered here ; immediately above and below the point of com- 

 pression it is well defined. The cellular portion of the tunica 

 intima is very much thickened. 



Third Series. — The third series, consisting of a few prepa- 

 rations where limited torsion had been performed upon the 

 femoral arteries of dogs, showed a process of healing similar 

 in very many respects to that described for the second series. 



At the point where the arter}^ was seized and compressed b}' 

 the limiting forceps, was to be seen the same growth of the 

 plastic clot springing mainly from the irritated intima, as was 

 described and represented in Fig. 9. The principal difference 

 between the preparations from the two series in question was 

 located in the lower end of the arterial stump, and was due to 

 the mechanical difference between the operation for ligature as 

 performed in the modified way, and that usuallj- followed while 

 performing limited torsion. In tlic latter, if the operation is 



