164 



THE FINANCIAL RESULTS OF FORESTRY. 



Similar to the progress of the current annual increment of 

 a wood, the current annual forest per cent, is at first small, 

 then rises, reaches a maximum, and then falls again. The 

 maximum is greater than that attained by the mean annual 

 increment, and also it occurs earlier (see fig. 41). 



Fig. 41. 



Of special interest to the forester is the relation which exists 

 between the current annual forest per cent. = p f and the 



Culmination oj mean p/. 



Year when S e culminates. 



Fig. 42. 



general per cent. p. At first c p f is < p, then comes a time 

 when the two are equal ; after that p f > p, and after a further 

 lapse of time e p f becomes =p a second time (fig. 42), but 

 beyond that period the forest per cent, is permanently smaller 



