THE FOEEST PER CENT. l9^ 



For the period 80 — 90 years : — 



log (100 + p,) = 



.^ , log (3,558 + 149 + 404 - 34) - log (2,860 + ^0-^) 

 "'' 10 



««->_^=2-25. 



The current annual forest per cents, given in the table at 

 page 197 have been calculated in this way, and they show, 

 that the financial ripeness occurred during the period 70 to 

 90, or, more precisely, in the year 79. 



