66 Germany. 



He divides into proportional areas (which were 

 marked by stones in the woods) equalizing them accord- 

 ing to age, quality, accretion, soil, exposure, so as to 

 secure equal annual budgets ; the stands were ranged into 

 seven or eight unequal age classes and each into as many 

 annual felling areas as there are years in the age class ; 

 if some of the age classes were absent, he cut in the older 

 class until the younger had grown to the proper age and 

 by varying the cut from good to poor sites or stands he 

 tried to even out the budgets. The volume budget he 

 determined by average accretion measurements. This 

 method was however much too far advanced and required 

 too much mathematics to find imitators at that time. 



Another method which proved also too complex for 

 the foresters of the time was that of v. Wedell ; neverthe- \ 

 less, by 1790 he had put into working order 800,000 

 acres in Silesia. He divided this area into districts, the 

 districts into blocks or management classes and used ani 

 elaborated proportional area division for determining] 

 the felling budget. He distinguished quality of stand] 

 and quality of site and made four site classes. The] 

 volume of stock he found by means of sample areas, toj 

 which he added the accretion in order to find the total] 

 volume for harvest, when it could be determined how] 

 long with a given budget the stands would last, or what] 

 average annual felling budget could be taken before thej 

 next age-class would be mature. 



In the North German plain with very uniform condi-- 

 ticns of soil and timber the method of equal felling areasj 

 was xhe meet natural and most easily applied. 



.Frederick the Great, who took a considerable interesi 

 in forest . matters, ordered such an area division 



