l64 ECONOMICS OF FORESTRY. 



velopment of a forest stand to secure certain 

 results in a given time. 



Instead of computing total quantities, we can 

 express the relationships in percentic proportions, 

 conceiving the stand of trees as a capital, and the 

 accretion as the interest on such capital, and speak 

 of the accretion per cent as basis for the more com- 

 plicated finance calculations. 



