NATURAL FORCES ON THE FARM 



ELMS AT THE WATER'S BRINK. 



The scene changes from day to day, but the forc'es which make 

 it are eternal. 



3. Natural forces at work on the farm are of three kinds, 

 the physical, the biological, and the chemical forces. 



a. A dashing rain falls on the corn field. The surface 

 of the soil is thus compacted ; its particles are pressed 

 tightly together. The farmer knows that unless this 

 crust is broken up the soil will lose a great deal of water 



