SIZE OF THE AGE CLASSES. 



217 



class were brought together on sejiarate areas, then the over- 

 wood, apart from the coppice, would form an open hij^h forest. 

 Of these woods the youngest would contain the standards from 

 1 to r years, the next those from r + 1 to 2 r years, and so on. 



-i^ 



Fig. 47. 



By degrees, the youngest class passes through all tlie inter- 

 mediate stages, until it l)ecomes the oldest and is cut over in 

 the course of r years. At each annual cutting, therefore, an 

 equal area must be cut over, on which the new, that is the 

 youngest, gradation is started, either naturally or artificially. 



