CHAPTER IX. 

 RATE OF INCREASE IN TIMBER. 



The Rate of Increase on Timber Trees varies according 

 to the kind and age of the trees and the conditions under 

 which tH^ are growing. Most of the Pine trees cut for 

 log timber in the North have been upwards of 100 years 

 old, and some of the White and Norway Pine that has 

 been cut over 300 .years old. Perhaps one of the largest 

 White Pine trees ever cut in this country was scaled by 

 H. B. Ayres. The tree was 253 years old, measured 

 forty-eight inches in diameter on the stump, and jaelded 

 4,050 feet board measure of log timber. The most rapidly 

 grown trees recorded in Minnesota were: Norway Pine, 

 100 years old, thirty inches on the stump, yielding 1,050 

 feet board measure; White Pine, 106 years old, twenty- 

 seven inches on the stump, yielding 1,050 feet board 

 measure, and White Pine, 108 years old, thirty-two inches 

 on the stump, yielding 1,450 board measure. The largest 

 recorded acre yield of White Pine in Minnesota was near 

 Carlton. The full yield of this acre was 111,050 feet 

 board measure, and after deducting for rot and crooks 

 94,264 feet of sound timber remained. The average 

 3rield of White Pine is much below this, and large areas 

 have been cut that did not yield over 5,000 feet board 

 measure per acre. 



Marketable White and Norway Pine may be grown in 

 about thirty years under the best conditions, and at this 

 age will probably be about eight inches in diameter and 



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