218 THE NORMAL AGE CLASSES. 



C, = xro. 



r+s 



Total number of annual coupes = n (in s) + 4 X n + m 

 5xn + s = r + s. 



(2) m s = n: 



r+s 



-A- 

 r+s 



C v =-A-xn 



r+s 

 Total number of coupes = 4xw+??t=5 



(3) 77i s>n, but m 

 C 7 =0 



r+s 



r+s 



-t C w = -xm 

 r+s 



Total number of coupes = 2 X n (m s) + 3 X n + m = 5 X n 

 + 8 = r+s ; and so on. 



It is obvious that for the shelter-wood system with natural 

 regeneration the above allotment is only of an ideal character, 

 because the duration of regeneration is so uncertain. The 

 regeneration class, the oldest and youngest classes are subject 



