CHAPTER V 

 COMPOSITION OF ANIMALS 



Combustible Matter. Animals are often de- 

 stroyed by fire; they possess, therefore, combusti- 

 ble materials. These consist largely of the nitrog- 

 enous substances, and the fats, both of which are 

 present in the frame, tissue and other organic por- 

 tions of the body. In the skeleton, or frame, three 

 classes of substances are formed protein, gelati- 



CHEAPEST GAINS ARE MADE WITH YOUNG ANIMALS 



As animals advance in age the cost of food for maintenance and increase 

 advances also. Compare the four classes of cattle as sketched above. 



nous matter, and horny matter. Of first importance 

 is the protein, which forms the greater part of the 

 muscular tissue, the various organs, the material of 

 which the nervous system is made, and the major 

 portion of the solid matter of blood. Connective 

 tissue, the combustible part of the cartilage and 

 bone, and the skin, are formed of the gelatinous 

 matter. Horn, hair, wool, and feathers constitute 

 the horny matter. The animal juices are of a nitrog- 

 enous origin also. The fats contain no nitrogen, but are 

 combustible and are either of a hard or a fluid nature. 



