94. THE SYLVICULTURAL SYSTEMS. 



the mother trees are in a position to attain a specially large 

 size (diameter), owing to their comparatively free position 

 (luring the last period of life. 



d. Kfft'it Vjion Ihv Fdilor.s af llic Liicalilij. 



The unfavourable effect of sun and air currents during 

 the early youth of the wood disappears under this system, 

 as the shelter-wood protects the soil until the new crop can 

 relieve it of this duty. In afterlife no difference exists 

 between this system and that of clear cutting. 



A modification of this system is the '' Shelter- wood Strip 

 System." Under this system each compartment is divided 

 into a number of narrow strips, which are successively taken 

 in hand for regeneration. The system is, however, otherwise 

 precisely the same as the shelter-wood compartment system, 

 the compartments merely receiving the shape of comparatively 

 narrow strips. 



8. 'Hie SJielter-icuod (irottp Si/stei)i. 



This is another modification of the shelter-wood com- 

 partment system. 



a. (h 1(1111 (tiid ( 'liiiracler. 



The wood is formed, or regenerated, under the shelter of 

 the old crop, but instead of taking a whole (or several) com- 

 partment in hand at one time, with a view to its simultaneous 

 regeneration, only certain groups of trees, scattered here and 

 there over it, are dealt with in the first place ; when these 

 have been regenerated, others are treated in the same way, 

 and so on, until the whole compartment has been regenerated. 

 Frequently the later groups take the shape of belts running 

 around the groups first taken in hand, so that the groups 

 finally niei'ge into each other. The period of regeneration 

 extends over not less than tliiiiy, and often forty or fifty 

 years, during which the old wood is gradually led over into 



