THE CIRCULATORY SYSTEM. 



445 



Detachment of bacteria containing fragments of the vegetations or 

 clots may give rise to single or multiple infectious ernboli and abscesses 



FIG. 242. STENOSIS OF THE AORTIC VALVES. 

 In chronic endocarditis. 



in various parts of the body, such as the spleen, kidneys, brain, skin, 

 heart wall, etc. Bacteria similar to those in the heart lesion may be 

 found in these secondary abscesses. 



FIG. 243. VEGETATION ON AORTIC VALVE IN ENDOCARDITIS. 

 Showing granular thrombus over the surface. 



It is probable that abscesses in ulcerative endocarditis do not always 

 arise from cardiac emboli, but may precede the heart lesion. 



