168 THE THEORY AND PRACTICE OF WORKING PLANS 



this conference should be incorporated in the revised working 

 plan. 



If the forest is essentially even-aged, the revised working 

 plan should contain under " Orientation ": " History of forest 

 with important changes," a diagrammatic presentation of the 

 distribution of the age classes, showing graphically the gradual 

 approach (presumably) towards normality in this respect. This 

 may be shown either by means of a graph or by means of pro- 

 portionate blocks (see Diagram D, p. 19). 



