296 JUDGING FARM ANIMALS 



solids. It is mainly composed of a sticky fluid called plasma, 

 in which are distributed immense numbers of corpuscles, 

 two-thirds of which are red, the remainder being white. 

 The red color in blood is due to a substance known as 

 haemoglobin, which absorbs oxygen from the air in the 



Fig. 164. "The circulatory system of the animal consists of the heart 

 and the arteries, capillaries and veins, through which the blood moves." The 

 arteries (white) conduct the blood from the heart to the udder. The veins 

 (black) are channels by which the blood returns to the heart through the 

 udder. This cow is Imp. Castlemain's Nancy 2d, a noted Ayrshire owned 

 by Penshurst Farm. 



lungs, using it in reducing the food so that it can be applied 

 to the building up of the body tissue. 



The circulatory system of the animal consists of the 

 heart and the arteries, capillaries and veins through which 

 the blood moves. There is also a much smaller system, the 

 lymphatic, which contains a colorless fluid, the lymph. The 

 heart, a hollow, muscular organ, acts both as a suction and 

 force pump, keeping the blood circulating through the body. 



