THE FOREST PER CENT. 191 



and 



™'p,-100(.\/^J-l). 



This formula was introduced by Pressler, who called the 

 ""'Pf thus obtained the imlkatiiui per cent. (Weiserprocent.). 



The indicating per cent, (or current forest per cent.) 

 indicates the per cent., with which the capital, represented by 

 a wood, works at the various periods of the wood's life ; in 

 other words, it indicates at any time, whether a wood is 

 financially ripe or not. As long as the indicating per cent, is 

 larger than the general per cent, p, at which money can be 

 invested otherwise with equal security, or at which money 

 can be obtained for investment in forestry, the wood is 

 financially not ripe; when the indicating per cent, has become 

 smaller than p, the financial ripeness of the wood is past ; 

 the wood is financially ripe at the time, when the indicating 

 per cent, is equal to p. 



It remains to substitute the proper values for ic and 11 • 

 The capital value w of the forest at the present time m is 

 represented by the value of the growing stock and soil, 

 correctly = "'6f, + *^'- As the formula is, as a rule, only used 

 in the case of woods, which are at or near maturity, the 

 utilisation value may be substituted for the cost value of the 

 growing stock, so that 



ic = i;^ + ,s'. 



