18 



YELLOW POPLAR IN TENNESSEE. 



cially larger trees among the dominant class in the even-aged stands, the 

 growth of which is far more rapid, and the small trees in the suppressed 

 class, the growth of which is much slowei . 



FIG. 3. Section of stem of yellow poplar 12 inches in diameter, illustrating 

 accelerated growth following isolation. The growth in diameter during the 

 last eight years amounted to 7 inches compared with the previous growth of 5 

 inches during 30 years while the stand was crowded. 



