98 LYMPH. } 



The blood is divided among the organs about as follows : 



1. One fourth is in the heart, arteries, and veins (including 

 those of the lungs). 



2. One fourth in the liver. 



3. One fourth in the skeletal muscles. 



4. One fourth in the other organs. 



The Lymph. We have seen that the capillaries have 

 very thin walls. Through their walls part of the plasma of 

 the blood soaks out, and is then called Lymph. It gets into 

 irregular cavities in the tissues called Lymph Cavities, or Lymph 

 Spaces. Most of these lymph spaces are minute chinks or 

 crevices in the connective tissue of the different parts of the 

 body. Opening out of the lymph spaces are irregular passage- 

 ways called Lymph Capillaries, and these lymph capillaries are 

 continuous with thin-walled tubes called Lymph Vessels (they 

 would better be called Lymph Tubes, for the same reason that 

 we prefer the term " blood tube " to " blood vessel," because 

 the expression " vessel " is naturally misleading). These 

 lymph tubes might be called the Lymph Veins, since they join 

 still larger tubes, closely set with valves, similar to those of 

 the veins. But, unlike the blood veins, the lymph veins do 

 not gradually increase in size by confluence. They suddenly 

 form a large tube, the Receptacle of the Chyle, beginning in the 

 upper part of the abdomen. This tube soon narrows and 

 passes through the diaphragm, close to the spinal column, 

 and up along the column near the aorta, and empties into the 

 veins of the neck at the junction of the left jugular and left 

 subclavian veins. This tube is the Thoracic Duct, but would 

 better be called the Lymph Duct. It has numerous valves, and, 

 like some of the smaller lymph veins, it presents a beaded ap- 

 pearance, due to the filling and bulging out of the valves. In 

 the right side of the neck is a short Eight Lymph Duct whith 

 receives lymph from the right side of the head, neck, and 

 thorax, and from the right arm. 



