144 FOREST REGUI.ATION 



up, in this way, a full 8oo-acre cut for the first period. Even then 

 he would not prevent entirely some of the timber from going over 

 the lOO years, unless he is ready to cut over 800 acres in the period 



1954-1973- 



d. In twenty years the forest is again examined and described ; 

 an entirely new plan is made ; the stands are again allotted to various 

 periods in keeping with the condition in which they are found in 



1934- 



e. To this Regulation is normally added, an estimate of the 

 amount of timber which the Stands finally placed in the first column 

 (period iyi4-i933) will furnish when cut. A common method is as 

 follows : 



Lot 6, 90 acres, 0.8 stocked will be (presumably) 100 years 

 old when cut (middle of period) and will then furnish per acre: 

 0.8 X 9000 cubic feet or 7200 cubic feet per acre ; total 90 X 7200 = 

 648,000 cubic feet. Of late the importance of Volume check has in- 

 creased. 



f. These estimates are not binding, area rules. If the cut for 

 the period of twenty years, is set at 760 acres, the yearly cut is 

 760/20-— 38 acres. 



g. The Method of -Vrea Allotment was first clearly developed 

 by Cotta ; it has been modified in keeping with progress in the 

 Regularity of State forests. Instead of insisting on a rigid continu- 

 ation of a first plan, the plan itself is renewed at regular intervals 

 (ten years Sa.xony, twenty years in other states). This method has 

 outlived and displaced practically all others, and its superiority has 

 induced the Prussian Government to continue it in official Instruc- 

 tions of 1912. 



In criticising this Method the mistake is usually made of 

 assuming that because the forester works out a few good tables 

 which tell him exactly the age and condition of every stand, and 

 because in making these tables he places the stands in different 

 period columns, the Plan is binding for an entire rotation and the 

 Method correspondingly rigid and useless. Part of this mistaken 

 criticism is due to the fact that a century ago when forests were 

 cheap, and money scarce, the administration, even such excellent 

 men as Hartig, did not dare to hope that the forests would stand the 

 expenses of re-surveys and Plan-revisions every ten or twenty years. 



