PART IV 

 HORTICULTURE 



CHAPTER XVII 

 FARM FORESTRY 



Characteristics of trees. Trees are the most prominent 

 and one of the most important and interesting features in 

 the living vegetable world. Their great height, their long 

 life, and their form distinguishes them from other plants. 

 The single stem or trunk, which develops more strongly than 

 the branches into which it divides and which in their aggre- 

 gate make up the crown, is the tree's most characteristic 

 form. The tree is the "whale" of the vegetable world in 

 size, and the "man" of that world in point of highest devel- 

 opment. 



Identifying the trees. Before we can go far into the study 

 of trees, we must be able to call them by their names. We 

 must know them at sight as we know our friends. It may 

 not be necessary for us to be able to tell just how we know 

 the maple from the ash when we are children the form, fea- 

 tures, and general appearances will guide but later we shall 

 need to use a "key," based on structural features of leaves 

 or other parts of the tree. 



Life processes of the tree. The two great life processes 



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