162 THE DEVELOPMENT OF BRITISH FORESTRY 



planted thickly enough to give a complete canopy by the 

 twentieth or thirtieth year. 



M- 



^ 



-M 



-M- 



M- 



M 



M 



M- 



-M 



-M- 



M 



^VI 



M = Birch or Mountain Pine. 

 S=Spruce. 

 L= Larch. 



1 



A = Pine, Larcb, Oak, etc. 

 B=: Beech or Spruce. 

 L= Larch. 



DIAGRAM FOR TREE-PLANTING. 



The question arises as to the minimum number of 

 trees which must be planted per acre to attain the above 



