TOLERANCE AND INTOLERANCE. 



35 



power of this kind, and makes a fine tree after spend 

 ing the first fifty or even one hundred years of its 

 life in reaching a diameter of a couple of inches. (See 

 fig. 29.) 



The relation of a tree to light changes not only 

 with its age, but also with the place where it is grow- 

 ing, and with its health. An intolerant tree will stand 



FIG. 33. Young Oaka staitiug under an old forest of Pines. Eastern North 



Carolina. 



more cover where the light is intense than in a cloudy 

 northern region, and more if it has plenty of water 

 than with a scanty supply. Vigorous seedlings will 

 get along with less light than sickly ones. Seedlings 

 of the same species will prosper under heavier shade 

 if they have always grown under cover than if they 

 have had plenty of light at first and have been de- 

 prived of it afterwards. 



