THE NORWAY POPLAR. 



289 



ameter at breast heio^ht of 5.26 inches. One hundred and ninety- 

 six ten-vear-okl trees planted two by four feet on lower, moister 

 ground had made an average height growth of forty to forty-five 

 feet and an average diameter at breast height of 5.62 inches. The 

 lower relative diameter of this group is due to the crowded con- 

 dition of the stand. Twenty-nine of the ten-year-old trees which 

 w-ere transplanted when three years old to a fence row and spaced 

 twelve feet apart showed an average height of fifty feet and an 

 average diameter of 9.54 inches, the largest being sixty feet high 

 and having a diameter of 11.6 inches. None of the foregoing were 

 cultivated after the first two vears. 



Norway pt)plar gi'own in the open. 



Four fourteen-year-old trees which were widely spaced and 

 ■well cultivated had an average height of sixty-four feet and a diam- 

 ■eter of 13.9 inches. 



Forty-six sixteen-year-old trees planted in a fence row around 

 the house in the shade of some silver maples and never cultivated, 

 showed an average height of fifty feet and an average diameter 

 at breast height of 9.4 inches, the largest being 11.7 inches. 



The growth of these trees tmder various conditions shows the 

 extreme susceptibility of the tree to cultivation and to the supply 

 of light. The growth is good in every case, but a little cultivation 



