Financial Methods. 117 



regulation. A working plan is provided which takes 

 care of securing an orderly progress of fellings and 

 proper location of age classes, to be revised every ten 

 years. 



Although this is undoubtedly the most rational 

 method yet devised, it has remained largely unused, 

 and is found in somewhat modified application only 

 in Austria and Baden. 



An entirely new principle in the theory of forest 

 organization was introduced, when the aim of forest 

 management was formulated to be the highest soil 

 rent. According to this requirement the proper 

 harvest time of any stand, or even of any tree, was 

 to be determined by the so-called index per cent., 

 that is, a calculation which determines whether a 

 stand or a tree is still producing at a proper predeter- 

 mined rate, or is declining. The advocates of this 

 principle were especially Pressler (professor of mathe- 

 matics at Tharandt, 1840 to 1843) and G. Heyer, son 

 of Carl Heyer, who based his method on his father's 

 formula, merely introducing values for volumes. 

 Judeich, director of the Tharandt school, also developed 

 in the sixties a method, based upon financial theory, 

 which is to attain the highest rate per cent, on the 

 capital invested in forest production. On the basis 

 of survey and subdivision of working blocks composing 

 a felling series, and with a rotation determined by 

 financial calculations with interest accounts, he makes 

 a periodic area division for determining the felling 

 budget in general, and in addition employs the index 

 per cent., as explained, for determining in each allotted 

 stand the more exact time for its harvest. 



