iO 



NATntAI, HEGKXKHATION Ol' WOODS. 



compartment, is considerably lonj^Pi- tlian midei' tin- compart- 

 ment system, and it extends generally over a period of 20 to 

 50 years, according to species and local conditions. 



A wood, while l)einp; regenerated under this system, presents 

 a varying picture : some" parts of it have been completely 



1, 1, 1. Points of attack (j^rmips of advance gniwtli;. 



2. 2, 2. I 



;j '.i 15 , 



' ' ',' ',' - Successive eiilarffoinciits of groups. 



.'), 5, n. I 



regenerated, others are more or less advanced in the process, 

 and others again are as yet untouched, with a complete cover 

 overhead. When the whole process has been completed the 

 young wood consists of trees varying in age by 20 to 50 

 years, according to circumstances ; it is in fact an uneven 

 aged wood. 



