2 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 foUowing direc- 

 tions : 



1. Increment. 



2. Growing Stock. 



3. Distribution of the Age Classes. 



Diagram A 



F 



In this connection it should be noted that while normaHty in 

 I and 3 of themselves result in normality 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- 



