$8 Veterinary Elements. 



being present in the greater numbers, in about the pro- 

 portion of 500 to 1. It is interesting to note that the 

 white blood cells have the power of motion and thus pass 

 through the walls of blood vessels, and also that if a 

 white blood cell comes in contact with foreign particles, 

 such as germs, coal dust, etc., it will flow around and 

 enwrap the object, and thus the particle taken in may be 

 carried from one place to another, knowledge of this 

 fact aids us in reasoning out the spread of a disease from 

 one organ or part of the body to another. 



The white blood corpuscles have been termed the 

 policemen or scavengers of the body, should germs gain 

 entrance at any point through a wound there is a flock- 

 ing of the white cells to the part and a battle royal 

 between the germs and the white cells takes place, many 

 On both sides are slain and are thrown off from the seat 

 of war (the wound) as pus (matter); if, however, the 

 body attacked is in good health its white cells win, over- 

 come, kill and cast out the slaughtered; if, however, the 

 germs are in the majority, the white cells weak, further 

 inroads are made by the germs, the disease affects one 

 organ after another until the animal or person dies from 

 the disease. 



Red blood vessels are about -g^ of an inch in diam- 

 eter and contain in their substance the hemaglobin or 

 red coloring matter of the blood. This red coloring mat- 

 ter combines very readily with the oxygen of the air. 

 The paleness often noticed in weak animals, whether 

 weak from lack of good food, pure air, or as a result of 

 loss of blood, is due to a deficiency in number of the red 

 cells, and therefore of the red coloring matter. The dif- 



