PRACTICAL FOREST MANAGEMENT. 



The con- 

 stitution 

 of felling 

 series. 



The 



standard 

 diameter 

 class. 



regeneration area is concentrated in one place, not because this 

 was particularly desired, but because the growing stock conformed 

 to this arrangement. The circumstances of each division will 

 determine the number and constitution of the working circles, the 

 composition and character of the growing stock and at times the 

 situation of the compartment will determine the allotment to 

 working circles. As a rule all the forests of a working circle must 

 be managed on the same rotation and the yield calculated by the 

 same or very similar methods. For instance forests in which the 

 regulation of the yield is by area and by volume respectively 

 should be kept in different working circles. 



A felling series is part of a working circle comprising a 

 separate series of age classes. Felling series are constituted from 

 the area of the working circle in order to provide a sustained 

 yield of forest produce to one or more markets or to distribute 

 forest works of all kinds over one or more ranges, although the 

 constitution of separate felling series for this latter purpose alone 

 is not necessary. Each felling series is a self-contained unit of 

 management with a separate calculation of the yield and a separate 

 series of all silvicultural operations. Where there is a local 

 demand for the produce, where rights have to be annually satisfied 

 at a reasonable distance from the right-holding villages and local 

 grazing rights have to be met, in these cases comparatively small 

 felling series will be indicated. Beyond what is necessary to 

 comply with the above considerations the number of felling series 

 should not be unduly multiplied. If too numerous, the number of 

 separate operations become inconveniently great and the work of 

 a given year is correspondingly scattered. 



As all statistical research is carried out in diameters it is 

 necessary that working plans which are founded on the results of 

 these researches should conform to the same standard measure- 

 ments, and as a corollary the classification of trees for exploitation 

 purposes should follow that adopted in the working plan. As a 

 result of the above considerations the following standard diameter 



