THE THEORY AND PRACTICE OF WORKING PLANS 



a theoretical ideal towards which to strive. Assuming, there- 

 fore, that every forest is more or less abnormal, it is necessary 

 to determine the degree of abnormality in the following direc- 

 tions : 



1. Increment. 



2. Growing Stock. 



3. Distribution of the Age Classes. 



Age in A'ears 



Ao 



Diagram A 



F 



20 



30 



40 



H50 



60 



80 



90 



Blou 



stocked with stands 100 years old 

 (BHEC), or if all the Area is stocked 

 with stands 50 years old (ABGF) . 



For the area of Cli. ABC= 

 I area of HH BHEC = 

 area of CZ! ABGF. 



Dia^am showing that) a Normal 



Growing Stock (N V) i^ possible even 

 with Abnormal Distribution of the 

 Age Classes for, if Normal Growing 



Stock is represented by ti^ABC, the 

 corresponding Volume is equally 

 attainable if one half the Area is 



In this connection it should be noted that while normality in 

 I and 3 of themselves result in normahty in 2, the reverse is 

 by no means the case. A normal growing stock may exist in a 

 forest with only a single age class. Valuable as its determina- 



