Bui. 1 54, U. S. Dept. of Agriculture. 



Plate II. 



Effect of Thinning Lodgepole. 



After its release this tree increased in diameter from 3.5 to 6.3 inches in 12 years. In the last 

 12 years the tree has been growing at the rate of an inch in diameter in 4 years, while in 

 the previous 12 years it had been growing at the rate of an inch in 25 years. The tree has 

 been growing 772 per cent faster in volume in the last 12 years than in the preceding 12 

 years. 2STote the thin bark. 



