242 



LECTURE X. 



cesses which arise in consequence of the obstruction may 

 also be very different. If, for example, a gangrenous 

 softening has taken place at the original site of the coa- 

 gulum, the metastatic deposit will also assume a gangre- 

 nous character, just as this would be the case if gangre- 

 nous matter were inoculated. So, vice versa, it also 

 happens that the secondary disturbances, like those at 

 the spot whence the fragments were detached, run a very 

 favourable course, the embolus like the thrombus becom- 

 ing converted into pigment and connective tissue, and at 

 the same time growing smaller. 



This group of processes must be separated from those 

 ordinarily occurring in pygemia all the more, because the 

 same processes are also met with on the other side of the 



FIG. 73. 



lungs in the regions belonging to the left side of the cir- 

 culation, where they often run the same course and pre- 



Fig. 73. Ulcerative endocarditis affecting the mitral valve, a. The free, smooth 

 surface of the mitral valve, beneath which the connective-tissue-corpuscles are en- 

 larged and clouded, whilst the intervening tissue is denser than usual, b. A con- 

 siderable hilly swelling caused by increasing enlargement and cloudiness of the tis- 

 sue, c. A swollen part which has already begun to soften and break up. d, d. The 

 tissue at the lower part of the valves which is stil but little altered, with numerous 

 corpuscles, the results of proliferation, e, e. The commencement of the enlarge- 

 ment, cloudiness, and proliferation of the corpuscles. 80 diameters. 



