10 LIFE ON THE FARM. 



up the rocks and make them fit food for plants. 

 This is done in several ways. Growing roots have 

 great power of expansion, so much so that when 

 they enter the cracks of rocks, or grow between 

 rock layers, they crowd these segments apart and 



SOIL BUILDING IN THE FOREST. 



break the rocks to pieces. Then again, the roots 

 of plants have little glands in them. These send out 

 acids which have the power of dissolving rocks and 

 small pieces of earth. In this way plants are enabled 

 to take earthy material into the structure of their 



