30 



PRACTICAL FOEESTEY. 

 POBESTS AND CLIMATE. 



The discussion of forest influence on climate began in this way. 

 When the French revolution broke out in 1789, the old restrictions 



Fig. 20. — European larch grove in western Miimesota. Cost of planting per acre 17 years ago, $64.45. 



Present value per acre, $484. 



on the management of private forests were removed. A wholesale 

 cutting of these timberlands promptly followed, and as early as 1792 



358 



