178 OUTLINES OF FORESTRY. 



best manner in which the products of the forest 

 may be harvested. 



Forestry does not endeavor to preserve intact 

 the virgin forests of the earth. On the contrary, 

 it teaches man how best to harvest the crops of 

 wood, or, where necessary, to safely effect the 

 entire removal of the forests. 



Among the different kinds of areas in agricul- 

 tural districts suitable for tree-planting are, 



1. Areas covered with poor or thin soils, where 

 other crops will not thrive. 



2. "Wet places, where other crops will not thrive. 



3. On the borders of rivers or streams generally. 



4. On mountain-slopes, hill-tops, or other eleva- 

 tions. 



Forests should be maintained on mountain- 

 slopes, because, 



1. The rainfall is greatest on such slopes. 



2. Because the rivers are born in the mountains, 

 and, when the forests are removed, the waters drain 

 so rapidly from the surfaces of the slopes that 

 dangerous floods occur, and much of the soil is 

 rapidly carried away. 



3. Because the presence of the forest prevents 

 the occurrence of disastrous droughts. 



4. Because the presence of the forest prevents 



