FORESTRY. 15 



the maintenance of some timber on nearly all 

 farm-land. 



These areas will, perhaps, in the majority of 

 cases be found as follows, viz. : 



1. On poor or thin soils where no other crops 

 will thrive. 



2. -In damp places where no other crops will 

 thrive. 



3. On the borders of rivers or other streams. 



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

 elevations. 



It can be shown, generally, that the areas which 

 can be most profitably set aside for the mainte- 

 nance of perpetual forests are situated, for the 

 greater part, in the mountainous districts of the 

 earth, the natural home of the forest. 



As will hereafter be shown, the forests should 

 especially be preserved on mountain slopes, for the 

 following reasons : 



1. Because the rain falls more frequently and 

 in greater quantity in the mountainous districts 

 of the earth than elsewhere. The cold mountain 

 slopes, chilling the air, cause it to deposit its sur- 

 plus moisture, in no matter from what direction 

 the winds may come. 



2. Because the principal rivers of the earth 



