INTRODUCTORY. 177 



can be cut, and the returns are equal, at any rate in quantity 

 if not in value. 



From a financial point of view, the further condition must 

 be added, that there should be no woods in the forest, the 

 forest per cent, of which has sunk below the general per cent. 

 p (see p. 169). 



In accordance with these definitions, the following matters 

 demand special attention : 



1. The increment. 



2. The rotation, or the normal age at which woods should 



be cut over. 



3. The normal age classes. 



4. The normal growing stock. 



5. The normal yield. 



6. The relations which exist between increment, growing 



stock, and yield. 



7. The real forest compared with the normal forest. 



VOL. III. 



