32 



A PRIMER OF FORESTRY. 



queutly those ou the lower aDcl inner parts of the crowu 

 are more vigorous, plentiful, and persistent than is 



the case with intoler- 

 ant trees. Thus the 

 crown of a tolerant 

 tree in the forest is 

 usually denser and 

 longer than tliat of 

 one which bears less 

 shade. It is usually 

 true that tlie seed- 

 lings of trees with 

 dense crowns are able 

 to flourish under 

 cover, while those of 

 light-crowned trees 

 are intolerant. This 

 rough general rule is 

 often of use in the 

 study of forests in a 

 new country, or of 

 trees whose silvicul- 

 tural character is not 

 known. 



TOLERANCE AND IN- 

 TOLERANCE. 



The tolerance or in- 

 tolerance of trees is 

 one of their most im- 



PiG. 29. — A. small Ked Spruce in the Adiron- 

 dack Mountains of New York. For many 

 years thia tree stood under the dense cover 

 of taller trees. During that time its bi-anches 

 spread to the sides, hut it made scarcely any 

 orowth in height. Then more light came to 

 it, ]irobahly by the fall of some tall neighbor, 

 and it began to recover its strength and grow 

 much faster. The thin upper part of the 

 crowu is where this faster height growth has 

 been going on. 



portant silvicultural 

 characters. Frequently it is the flrst thing a forester 

 seeks to learn about them, because what he can safely 



