72 Germany. 



felling areas was the most natural and most easily 

 applied. 



Frederick the Great, who took a considerable inter- 

 est in forestry matters, ordered such an area division 

 for the State pineries in 1740, fixing upon different 

 numbers of felling areas, but finally, in 1770, deciding 

 on a rotation of seventy years. Lack of personnel 

 retarded progress in this forest survey and regulation 

 until in 1778 v. Kropf undertook the direction. Not 

 agreeing with his master regarding the short rota- 

 tion of seventy years, he arranged to have each dis- 

 trict divided into two working blocks, and by cutting 

 alternately in these, managed to double that rotation. 

 His successor, Hennert, in 1788, devised a new method 

 by introducing allotment of a number of annual felling 

 areas to a period of the rotation when at least the 

 periodic budget could be equalized. A value or money 

 yield equalization of the felling budgets was also 

 attempted. 



For easier handling, the forest was divided into 

 small compartments or Jagen and a classification of 

 four, still uneven, periodic age classes (of different 

 length for conifers and broadleaved forest), and three 

 site qualities were employed. The merchantable 

 stock was ascertained by a sample area method and 

 the felling budget by dividing the oldest age class by 

 the number of years it must last until the next was 

 ready. Since no attempt was made to secure a proper 

 age class gradation, the method failed to improve 

 conditions for the next rotation. 



Some 500,000 acres were regulated according to this 

 plan in Prussia, probably very superficially. 



