18 \ I'RIMKK OK FORESTRY. 



Thus. by combining the method by volume and the 

 method by area the annual yield of a forest might be 

 established at L^>O board feet per acre. This yield 

 might he cut from the forest every year, or it mio-ht 

 be allowed to aeeumulate for twenty years, and then 

 :.no() board feet per acre might be cut. 



siiAirt i/n RAI. SYSTKMS. 



After the yield has been found it must be cut not 

 only without injury to the future value of the forest, 

 but in such a way as to increase its safety and useful- 

 ness. To this end certain ways of handling forests, 

 called silvicultural systems, have grown up. They are 

 ba>ed on the nature < itself, and are chiefly 



imitations of what n:> open in the forest 



without their help. 



From the point o >;ement. one 



of the principal dill Is whether 



they spring directly t'r, 'need as 



sprouts from stumps or roc. round. 



A forest composed of seedling Seed 



Forest, or more commonly but 1< 'ling 



or High Forest. One composed '<en 



of as a Sprout or Coppice Forest. 



ply as Coppice, or as Sprout land. S 3 are 



usually composed of coniferous li irelv 



sprout, or of broadleaf trees allo\\ 

 sixe. Sprout Forests are common w 

 trees are cut while they are still youn 

 ing power usually diminishes with age 

 reach BO great a height- and diameter ; 

 although in youth they grow much fast 



