GROWTH OF OAK IN THE OZARKS 9 



shown, and not radii. A similar study of bark thickness in rela- 

 tion to present diameter inside the bark is the basis for Figure 2. 

 It is obvious that while a single section will serve to locate but a 

 single point on Figure 2 it will locate on Figure 1 as many points 

 as there are full decades in its age. 



Tables I to IV show the diameter growth at breast-height for 

 the four species as read from the curves in Figures 1 and 2. The 

 first column is the diameter in inches inside the bark at breast- 

 icight, a point 4^2 feet above the ground. The second column 

 s the diameter growth (twice the radial growth) of wood laid on 

 during the ten years following the attainment of the diameter 

 shown in the first (and last) columns. The third column is the 



TABLE I. DIAMETER GROWTH AT BREAST-HEIGHT BLACK OAK. 



