56 



ELEMENTARY FORESTRY. 



charcoal, medicinal products or the products of distillation, 

 the total value of which products is very large. 



The saw mill cut of Minnesota during- the past five years 

 has been estimated at 1,323,497,000 feet board measure per 



Figure 8. Old pine cuttings alter being once burned over. 



year, of which about 323,000,000 feet has come in from neigh- 

 boring- states. 



The best authorities agree that the normal annual increase 

 on our 12,000,000 acres of forest area should be about 2,000,- 

 000,000 feet board measure or a mean annual increase of 185* 

 feet B. M. per acre. If this were true it would leave a wide 

 margin to our present annual timber cut without impairing 

 our normal growing stock. In other words this great lumber 



* This is a very conservative estimate since many observations show 

 that the annual increase in this section may exceed 5OO feet board 

 measure per acre. 



