88 Forest Club Annual 



4. An analysis of the stand should next be made. A conven- 

 ient method for doing this will be found farther along in this 

 article and the discussion of it is therefore deferred. 



5. The felling budget is then computed. This may be done 

 by several methods or combinations of them : 



(a) From an analysis of the stand the number of trees 

 above the diameter limit is computed together with the other 

 trees that should be removed for cultural reasons. With ihe 

 use of a volume table or a volume curve the contents of these 

 trees are found. 



(b) The felling volume may be computed by the Von 

 Mantel formula. The trees which enter into this volume will be : 



(1) Those which should be removed for cultural 

 reasons, being indicated for removal in the analysis 

 made; 



(2) Those above the diameter limit. 



(3) Enough others to make up amount called for in 

 periodic budget. 



The Von Mantel formula gives the volume of the felling 

 budget as follows : Annual budget equals actual volume of the 

 stand divided by one-half the rotation. The application of this 

 formula is a safeguard against overcutting the stand and should 

 eventually bring about an approach to normal volume of grow- 

 ing stock. The annual felling budget multiplied by a number 

 which will give a product large enough to make logging profitable 

 represents the periodic felling budget. The number by which the 

 annual budget is multiplied is the number of years in the cut- 

 ting cycle, or the number of years that must elapse before an 

 equal amount can be again cut, if the stock is normal, which 

 is, however, not usual. 



When marking for cutting the diameter limit will not be 

 inflexible. It will be presumed that the volume of those marked 

 that are below the limit will about equal those left for silvi- 

 cultural reasons above the limit. 



The second method may be employed in determining 

 the felling budget, but when marking is being done some effort 

 should be made roughly to regulate diameter class gradations. 

 Or the effort may be carried still further along the same lines 

 and care may be taken that the normal numbers in those classes 

 be left regulated to a greater or less degree as suggested in the 

 April number of the Forest Quarterly. Even in the analysis 



