62 LABORATORY METHODS OP 



of fibrous tissue. The lymphatics of the heart are 

 many and are found in two places, viz. : around the 

 coronary arteries and between the muscle fibers The 

 capillaries are minute ramified arteries, which have lost 

 their outer coat and hence become very thin. This 

 thin space is where the white blood cells leave the ves- 

 sels in inflammation; the spaces are called stigmata. 

 The blood vessels are richly supplied with lymphatics 

 which are seen ramifying in the outer coat of the 

 larger arteries and surrounding the smaller capillaries. 



T. S. BLOOD VESSEL. 

 Showing bands of yellow elastic tissue. 

 Tunica intima; 2, Tunica media; 3, Tunica 



