13 THE VOLUilKTEIC ilETHOD. 



cubic feet -vrould have to be added to it, by transferring to the First 

 Period a suflScient number of the compartments to be regenerated 

 according to the Provisional Scheme, at the commencement of the 

 Second Period. The same process is continued for the other 

 Periods until an equal distiibution has been made. But easy aa 

 the process seems, the final result is arrived at only after a great 

 deal of careful manipulation, of trial transfers and calcula- 

 tions ; for each transfer means that the time for regenerating 

 the compartments concerned is changed, the yield both of the 

 Prinicipal Fellings and the Improvement Cuttings being thereby 

 altered. The effect of this is to obtain each time a new figure for the 

 total produce to be felled during the whole Rotation. Going back 

 to the case we have taken for illustration, the total quantity of 

 produce after the transfers in question have been effected may 

 be reduced to 4,800,000, and the periodic quota thus become 

 1,200,000. In any case, it is only in determining the quota for 

 the last Period, when the yield of all the remaining compartments 

 is added up, that the effect of the changes can be fully appreciated 

 and it be decided, according to the extent of the resulting 

 difference, whether these changes may be considered final and be 

 accepted for the Final Working Scheme, or a fresh series of 

 transfers be undertaken in order to arrive at a more approximate 

 equalization. In the latter case, the Periodic Distribution State- 

 ment last obtained must be considered as a fresh Provisional 

 Working Scheme, and the process described above repeated. 



SECTION III. 



Value of the Volumeteic Methob. 



The operations of a forest organisation based on tbe Volumetric 

 Method are necessarily very complicated. They imply the quanti- 

 tative valuation of all the standing material in the entire Working 

 Circle ; the estimation of the future increment of every crop up 

 to the moment of its exploitation ; and, lastly, the determination of 

 the quantity of accessory produce that will be furnished during 

 the current Rotation by the crops, which will have taken the place of 

 those regenerated early enough in the Rotation, that is to say, crops 

 that have no present exittence whatsoever. Indeed, it is the 

 very essence and spirit of tbe Volumetric Method to determine 



