CIRCULATION OF BLOOD AND OF LYMPH 



165 



crease, even though the blood does flow a little more rapidly 

 through the skin. These facts make it clear that alcohol can- 

 not properly be called a stimulant of the circulatory organs. 



THE LYMPH SYSTEM 



Source of Lymph. Blood in its usual condition occurs 

 only in blood vessels, and so long as it is in the vessels the 

 innumerable living cells of the body cannot profit by the 

 nourishment it contains. But while it is passing through the 

 capillaries, the liquid plasma, together with some of the white 



Capillary 



Vein 



Arten 



Capiffonf 



FIG. 91. DIAGRAM 



Showing the origin of the lymph and the interchange of material between the living 

 cells and the lymph. Oxygen, various food materials, and water pass from the 

 capillaries to the cells via the lymph. The cells give up, e. g. carbon dioxid, 

 uric waste and water, which is carried away either through the veins or through the 

 lymph vessels. 



but with none of the red corpuscles, oozes out through the 

 thin walls of these vessels. Outside (see arrows in Fig. 91), 

 this plasma flows irregularly in all directions among the liv- 

 ing parts of the body, actually bathing the cells. It is no 

 longer known as blood but as lymph and soon collects in 

 small vessels called lymph vessels; Fig. 92. This lymph is 

 a clear, watery fluid, containing in solution all of the food 



