24-^ NATlliAL KEGENEKATIUN OF WOODS. 



system it is not iiuich valued, partly because it f,'ives the 

 youn<; crop an uneven character, and partly because, having 

 stood for some time under the shade of the old crop, it is not 

 always capable of developing into healthy full-sized trees ; 

 hence, it is frequently removed altogether to make room for a 

 uniform new crop. Under the group system all patches of 

 advance growth, which are still healthy and capable of 

 developing into full-sized trees, are carefully husbanded. 

 They form the nuclei of the first regeneration groups ; the 

 old trees standing over them are removed when no longer 

 required, then the groups are enlarged, as indicated above, 

 by gradually cutting away the immediately adjoining trees in 

 narrow bands. 



ii. DlKFEUEXtKS OV Ann, CUOWIII. CnVKl:, AMI Sl'KCIKS. 



Many old woods are naturally of uneven age. In such cases 

 the oldest parts are first taken in hand, followed by the next 

 age gradation, and so on. 



Again, certain parts, for one reason or another, have not 

 kept pace in development with the rest, nor are they likely to 

 make up for it. They should be taken in hand first, so as to 

 avoid loss of increment. 



Frequently certain parts have thiinied out naturally, 

 followed by an hiterruption of the leaf canopy ; they must 

 be attacked tirst of all. 



In mixed woods, groups of dilierent species may require 

 regeneration at diti'erent times, ofifering an additional 

 opportunity for a judicious selection of the groups first 

 to be taken in hand. 



iii. I)iki<ei:kn(;i;s in the Cunuition.s uf the Lucamtv. 



These may demand different treatment. The degree of 

 moisture, porosity and fertility may vary from place to place, 

 according to the surface coniiguration, aspect, and the character 

 of the soil, inviting a change of treatment, and an earlier or 

 later commencement of the regeneration })rocess. 



