VERTICAL FARMING 



ROOTS OF TREE WIDENING A CRACK IN A ROCK. WHEN GIVEN 



FISSURES TO GROW THROUGH ROOTS WILL PENETRATE HARD 



MATERIAL TO GREAT DEPTHS 



Plants Render Assistance. Just as soon as a little powder 

 is formed from the rocks by the action of these agencies, minute 

 plants, some of which can be seen only by means of a micro- 

 scope, fasten on the rock meal and begin to grow. As they 

 mature and die, their tiny bodies add the first organic matter 

 to the newly formed soil and help prepare it for larger and 

 more vigorous plants. The study of this action is very inter- 

 esting,' and a short search into any stony place will reveal many 

 examples. Mats of short moss will be found growing on what 

 seem absolutely dead and impervious stone. Trees can be 

 found sending their roots into the smallest fissures in the rocks 

 and bursting them wider. It is a hard life for these plants, 

 and their growth is slow and stunted, but it is one of their 

 missions in nature and they go on with the heavy work, giving 

 to man at the same time a wonderful revelation of what he can 



