266 



FIRST YEAR SCIENCE 



When the native forests are destroyed, trees of other 

 kinds may in time replace those removed, but frequently 

 these are of less commercial value. Thus, when the coni- 

 fer forests of the northern states are cut off, birches and 



GOOD FORESTRY. 

 Notice bow the underbrush and small limbs have been cleaned up. 



poplars replace them. If only the larger trees had been 

 cut, leaving the smaller and younger trees to hold the 

 ground, the more valuable forests might have been re- 

 tained. 



122. Flora of the United States. The United States has 

 such a great range of climate, soil, elevation and other 

 geographical conditions that it possesses a large variety 

 of plants. About five hundred different kinds of native 

 trees have been listed, and there are many different kinds 

 of shrubs and smaller plants. To these native plants 

 must be added many useful as well as ornamental plants 



