THE rOLUMlTBIC METHOD. 12 



regenerated towards the middle of the corresponding Period. This 

 enables us to determine, first, the probable quantity of the prin- 

 cipal produce which each compartment will yield during the Period 

 in which it will be regenerated, and, second, the respective year* 

 in which the various compartments will be subjected to improve- 

 ment operations and the probable quantity of produce which each 

 such cutting will furnish. 



Let us first note that these figures cannot be arrived at without 

 complicated calculations as to the quantity of the standing material 

 and its future increment. It is necessary to estimate not only the 

 quantity of produce which each crop will furnish at its regeneration, 

 but also what each compartment would yield in the tbinaing and 

 other operations during the various Periods of the Rotation, before 

 as well as after the time fixed for its regeneration. In whatever 

 way these quantities may be obtained, they must be totalled up by 

 Periods. But the original distribution of the compartments having 

 been effected solely with regard to their age and the order of their 

 successive exploitation or regeneration, without any consideration 

 as to the extent or density of the crops grouped together under 

 each Period, it follows that in the Provisional Working Scheme, the 

 periodic quantities are necessarily very unequal. Henf;e, the 

 necessity for equalising tbe;n by judicious transfers of certain crops 

 from one Period to the next above or below it. 



To effect this equalization, the quantities of both principal 

 and accessory produce for all the I'eriods of the Rotation, as shown 

 in the Provisional Scheme, are totalled up. This grand total is 

 then divided by the number of the Periods, and the quotient thus 

 obtained gives the quota of produce to exploit during each Period. 

 For instance, if the total quantity for the whole of a Rotation, 

 divided into four Periods, is 5,00^ 000 cubic feet, then the quota 

 for each Period would be 1,250,000 cubic feet. If (to continue our 

 illustration), according to the Provisional Working Scheme, the 

 quantity of produce that may be cut in the First Period is 1,500,000 

 cubic feet instead of 1,250,000, the former fiijure must be reduced to 

 the extent of 250,000 cubic feet by transferring the compartments 

 to be regenerated last to the nest following Period. If, on the 

 other hand, the total produce for the First Period according to the 

 Pioyieional Scheme was only 1,000,000 cubic feet, then 250,00© 



