208 THE NORMAL AGE CLASSES. 



Let total area = .1 , 

 Rotation of the coppice = r, 



then tile annual cutting area c = -~. This holds good for the 



coppice with standards system, because the annual cutting 

 area is governed by the coppice only. 



//. ('/ear Ciiffi/i// in. Hhjli Forest. 



Here is again : 



. ^ A 

 r ' 



if each clearing is at once re-stocked. It frequently happens, 

 however, that the cleared coupes lie fallow for one or more, 

 say s, years ; in that case : 



A 

 r + s' 



so that the forest consists, immediately before cutting, of a 

 series of age gradations from 1 to r years old and s blanks, or 

 altogether r + s coupes. 



r. 2Vie >%elter-wood Co)npartmenf tiyslem. 



Under this system, the regeneration of each coupe extends 

 over a number of years, say /// ; hence, it is necessary lo throw 

 //( annual coupes together into a regeneration coupe, the crop 

 on which, by gradual cuttings, is led over, in the course of 

 m years, into a young wood. The size of the regeneration 



coupe is, therefore, = - X ^/;. 



In this case the first of the successive cuttings towards 

 regeneration may be made — 



Either in the year r, so that the trees removed at the end 

 of the regeneration period would be /• + m years old, and the 



mean age r +— -' years ; in other words, the procedure would 

 lead to a raising of the rotation from r to ' H--^^- years ; 



