46 Forestry Quarterly 



Conditions in America, especially in the west, are not intensive 

 enough to apply the method. It would involve too much time 

 and expense in the west, though it might be used in the smaller 

 forests of the east, as in New York and New England. 



This method of control competes with the other established 

 methods of yield regulation only in so far as selection forest is 

 concerned. For even-aged forest it is not suited. But for selec- 

 tion forest it rests on a surer foundation than do the older 

 methods which depend on age (as shown by diameter attained), 

 distribution of the age classes, yield factors {e. g., Hundeshagen's 

 "use per cent."), rotation, etc. 



Control eliminates everything that is uncertain. It uses only 

 the actual growing stock and the current periodical increment. 

 It uses frequent determinations of the growing stock (recon- 

 naissance) and facilitates these by obviating height measure- 

 ments. The figures for growing stock and increment are used to 

 determine the increment per cent, which plays the leading role in 

 the final determination of the yield. 



There is only one way to determine the value and applicability 

 of the "Method of Control" and that is by trying it out on various 

 forests. If these experiments are carefully conducted no harm 

 can result to the forest, even if the method does not measure up 

 to expectations. 



