12 



Forestry Quarterly. 



The greatest growth seems between the ages of lo and 20 years. 

 During early youth, because of the density of the stand, the 

 growth goes into height, but once the competiton for Hght is 

 lessened, volume and diameter growth become more prominent. 

 From the 40 to 70 years the progress is uniform at nearly 1.5 inch 

 per decade. Then it slowly declines, and at about 90 years, the 

 diameter accretion is practically at a standstill. 



TABLE No. 5. 



Diameter Grozvth. 



(Basis : 100 trees) 



Age Diameter breast high 

 5 years 



Age Diameter breast high 

 60 years 11. 7 inches 



Time Required to Increase Diameter one inch, under Average 



Conditions. 



