311 DETERMINATION AND REGULATION OF THE YIELD. 



may be dragged over a whole rotation, whereas it should- 

 be removed as quicldy as possible ; or, on the other hand, 

 it may take a whole rotation to make good any deficit of 

 growing stock. 



For a financial management, the method is little adapted, 

 except in so far, that it introduces order into the management. 

 It gives only a limited latitude to the forester to hold over 

 vigorous woods, or to cut over those, which are deficient in 

 increment. 



2. The MetJiod of Periods hi/ Volume. 

 II. Dcscripiioii of the Meihud. 



The woods of a forest are so allotted to the several periods 

 of a rotation, that each yields the same, or approximately the 

 same, volume. In some cases only the final returns are thus 

 regulated ; in others the intermediate returns are utilised to 

 equalise the jdelds of the several periods. 



The allotment is based upon the table of age classes ; then 

 shiftings are made, so as to bring woods, which have a poor 

 increment, early under the axe and establish, as far as prac- 

 ticable, a suitable grouping of age classes ; then further shift- 

 ings are made, so as to equalise the periodic returns. The 

 result represents the general working plan for the first rota- 

 tion. It will be observed that, in the majority of cases, the 

 areas placed into the several periods will be uneven, resulting 

 in uneven returns during the second rotation, unless a fresh 

 allotment is made. 



Example. — In Appendix lY., B, page 388, only the final re- 

 turns have, for simplicity's sake, been equalised. The data 

 are those of the Krumbach communal forest given in 

 Appendix IV., A. 



As the future returns have to be estimated for a whole rota- 

 tion, it is evident, that yield tables must be used ; accordingly, 

 the above general working plan has been based upon the data 

 for beech high forest, given at page 121. After making the 



