60 



THE ADIRONDACK BLACK SPRUCE. 



And from the measurements and notes made by Foresters 

 Olmstead and ISanford in Township 20, Franklin county, and 

 Township 3 (" Atherton "), St Lawrence county, the following 

 deductions as to the average age of the Adirondack spruce are 

 made: 



TABLE VI. 



We are unable to account satisfactorily for the difference in 

 average age as indicated in the two preceding tables. It may 

 be that if the figures in the first had included as large a number 

 of trees and as wide a scope of territory as are embraced in the 

 second table, that the two results would agree better. The aver- 

 age age as indicated in Table Y corresponds substantially with 

 that of the black spruce in Maine, as based upon measurements 

 made by Mr. Austin Gary, whose report shows that the average 

 age of the 12-inch spruce is 171 years; the 13-inch, 174 years; 

 the 14-inch, 189 years, and the 15-inch, 185 years. 



A remarkable feature in connection with the biology of the 

 spruce is the exceedingly wide range of ages in trees of the same 

 diameter. Thus, in Table YI it will be noted that of 187 trees 

 all 14 inches in diameter on the stump, there is a difference of 

 110 years in some of the ages. Some will readily explain this 



