NUTEITION OF ANIMALS 261 



There are other waste products in the blood which have been 

 taken up from the tissues and which are eliminated through 

 the kidneys. 



286. Proper nutrition. From what has been said of the 

 nutrition of man it must be apparent that anything which 

 interferes with any of the processes involved would interfere 

 with ability to work. Energy, as has been seen, is derived from 

 the breaking down of protoplasm, and protoplasm is replen- 

 ished by food which is digested and brought to the tissues 

 of the body. A poorly nourished body will be deficient in 

 energy. The proper care of the organs of nutrition is very 

 important. This subject is considered in the next chapter. 



