QUANTITY INCREMENT PER CENT. 



189- 



100 

 in a certain year r is still greater than , it shows that the 



T 



moment when the mean annual increment culminates has not 



100 

 yet been reached the wood is not yet ripe. If p v < 



100 



then ripeness is past ; and if p v = , the wood is just ripe. 



r 



It remains to add, that the formula for the increment per 

 cent, can be applied to height, diameter, or basal area incre- 

 ment, as well as to volume increment. 



Example. The accompanying two tables are yield tables for 

 the Scotch pine III. quality, according to Weise, the first for 



III. OK MIDDLING QUALITY, ACCOKDING- TO WEISE. 

 3 inches diameter only. 



