146 THE FOEEST LANDS OF FINLAND. 



years on poor lands ; and timber for saw-mills should be 

 from 100 to 140 years of age. In Central Finland, up to 

 64, the growth of trees requires about 20 years more 

 under the same conditions. In fine, in the North they do 

 not obtain firewood or carpentry wood under the age of 

 120 to 180, or timber for saw-mills before from 180 to 230 

 years' growth. 



