THE SOURCE OF ALL FOOD 



139 



AS 



Milk is very nearly a perfect food. The illustration 

 shows a glass of milk and the divisions indicate the dif- 

 ferent parts of the milk. Such a drawing is called a 

 diagram. The other illustrations show some common 

 vegetables. Note that there is more water in all of these 

 vegetables than in milk This is true of nearly all vege- 

 tables and fruits, before they are dried. Notice also that 

 vegetables have very little fat. For this reason they are 

 good for summer food, as we need, and should eat very 

 little fat in warm weather. 



In Section 31 we learned that ihe bacteria took in 

 the nitrogen from the air and changed it into food for 

 plants, and that it was this food which if we ate it, 



LETTUCE 



,45 



CAVL/FLOWE& 



----- -94.7 '<#> 



0.3 



G4RBO- 



0.3 



ASH 



would give us strength. Protein is the food which the 

 plants make by the aid of the bacteria. So again we see 

 that life would be impossible without our friendly bac- 

 teria. 



Cut supplied through United States Department of Agriculture. 



