FOREST MANAGEMENT 139 



different points in the forest, and to return to these for the 

 continuance of the fellings, not annually, but at stated intervals. 

 The formation of small cutting series, giving many of these 

 centres or points of attack in exploitation, is therefore to 

 be recommended. Many dangers to which regular age- 

 gradations, when too closely associated, are prone are thus 

 avoided, or at least considerably reduced. 



Formerly the data determining the quantity of timber to 

 be felled were also recorded in the General plan. Now, 

 however, since it has become customary to reckon the volume 

 and increment only for the first Period, or even only for the 

 first ten years, it has been found most suitable to give the 

 figures regulating the yield in the Periodic plan. This latter, 

 following the principles laid down in the General plan, deals 

 in a detailed manner with the necessary fellings and regenera- 

 tions. The woods which require to be entered in the scheme 

 of fellings as those first to be taken in hand are the following : 

 (i) defective old woods which are improperly stocked, being 

 blanky or too open ; (2) odd corners which have arisen in 

 the course of laying out the system of roads, and whose age, 

 species, or character suggest alteration; (3) areas to be cleared 

 between divisions of the forest as Severance fellings in the 

 interests of the cutting series ; (4) the removal of parent or 

 shelter trees from regeneration areas, where such trees are no 

 longer desirable. 



If, after such woods have received attention, the felling 

 budget allows of still more being utilised, parts of the forest 

 where the yearly accretion has become unsatisfactory should 

 be dealt with. Where the "indicating per cent." (showing 

 the interest yielded by the forest capital) has not been ascer- 

 tained, the condition of the woods and of the cutting series 

 must decide the woods' position in the Periodic plan. 



The volume of wood on the area to be cut over during one 

 Period, along with its increment up to the time of cutting, 

 is the measure of the Period's "final yield." The quantity 

 divided by the number of years in the Period gives th; 

 annual yield. To this must be added the intermediate yield 



