23 
TABLE XV. OAK 
Bole Diameter Crown Radius 
Feet Inches Feet 
50 13.4 10.4 
45 13.6 11.0 
40 13.8 11.3 
35 13.9 12.0 
It will be observed that the 11” and 12” diameters have be- 
come merged into the 13” and 14” classes. It will be noticed 
also that while the difference between the diameters amount 
to 3.7 per cent, the difference in crown radii amounts to 15.4 
per cent. Within narrow limits each diameter can be pro- 
duced by different sized crowns. Generally, however, the 
larger crown is associated, as in the table, with a shorter bole. 
The extra energy developed by the larger crown is used up in 
‘forming branch wood. 
Sample trees with boles above forty-five feet which were 
felled as well as the stump analyses showed that a diameter of 
13.4 to 14.9 was produced in sixty-five years. At the rate of 
growth occurring in the 13.4” tree during the decade prior to 
felling, a diameter of 15” would be produced in seventy years. 
It was found, by the method to be discussed in the next sec- 
tion, that a crown of 11.2 feet radius would be associated 
with a fifteen-inch diameter and fifty-foot bole. In the 15” 
diameter class the longest clean bole was forty-nine feet and 
was associated with a crown radius of only nine feet. The 
average for the class was 12.5 feet, so that the radius 11.2 
feet is well within the lower limit of the range found in nature. 
It may be again stated that in each diameter class the 
longest boles are associated with the smallest crown radii. 
The final harvest of oak then will consist of trees averaging, 
at seventy years, 15” in diameter, fifty feet bole, 11.2 feet 
crown, and a height of eighty-five feet. A tree of these 
dimensions will produce an average width of 9.1’ for 2” plank. 
Having selected the type of tree that is to form the final 
harvest, the question arises as to how to treat these areas, 
which have reverted to hardwood, so as to produce the de- 
