157 



From this series of curves Table Xo. 1 was taken. The cubic contents 

 (Table 2) oP the average tree at ten year periods throughout its life, was 

 computed according to the Sehiffel formula, which is (.16B + .66b)h = V, 

 in which B represents the area of cross section at breast height, b represents 

 the area of cross section at mid-height, h represents the total height of the 

 tree, and V represents the volume. 



TABLE I. — Diameters at various points along the bole for every decade throughout 

 the life of the tree; white oak. 



Age in Years. 



Height of 



Section 



Above Ground, 



in Feet. 



(Stump) lh. 

 D.B.H. 4*. 



10 20 I 30 40 50 I 60 70 | 80 90 100 



13i. 

 2U. 

 35J. 

 41*. 

 50.. 



1.0 



110 120! 130 



Diameter inside the bark, in inches. 



2.2 

 1.0 



3.3 



2.0 

 1.0 



4.5 



3.2 



2.2 



.9 



6.9 

 5.4 

 4.3 

 3.0 

 1.4 



8.2 

 6.5 

 5.3 



4.2 

 2.5 

 1.1 



10. 

 8.6 

 7.5 

 6.3 

 4.6 

 3.3 



12.0 



13.2 



14.5 



9.8 



10.9 



12.2 



8.6 



9.8 



10.7 



7.4 



8.5 



9.6 



5.7 



6.7 



7.8 



4.3 



5.3 



6.4 



1.8 



2.8 



3.9 



15.9 

 13.4 



TABLE I — Continued. 



Height of 



Section 



Above Ground, 



in Feet. 



(Stump) 1* 

 D.B.H. 4J 

 13* 

 21i 

 35* 

 41| 

 50. 



140 



Age ix Years. 



ISO I 190 200 i 210 220 



Diameter inside the bark, in inches. 



17.4 



18. S 



20.3' 



14.6 



16.0 



17.4 



13.0 



14.0 



15.2 



11.7 



12.8 



13.9 



10.0 



11.0 



12.2 



8.5 



9.6 



10.6 



6.0 



7.2 



8.3 



22.0 

 18.7 

 16.3 

 15.0 

 13.2 

 11.6 

 9.3 



23.8 



25.4 



27.2 



29.0 



30.7 



32.7 



20.2 



21.5 



23.0 



24.5 



26.0 



27.6 



17.4 



18.4 



19.4 



20.5 



21.5 



22.6 



16.0 



17.1 



18.2 



19.3 



20.3 



21.4 



14.2 



15.3 



16.3 



17.4 



18.4 



19.5 



12.7 



13.7 



14.8 



15.8 



16.9 



17.9; 



10.3 



11.4 



12.4 



13.4 



14.5 



15.6 



35.0 

 29.3 



23.6 

 22.6 

 20.5 

 19.0 

 16.6 



