192 



STUDIES OF TREES 



hemlock, to grow under light-demanding trees like the 

 pine. This system presents a " two-storied " forest and 

 is known by that name. The under story often has to be 

 established by planting. 



In the system of reproducing forests from shoots or 

 suckers, all trees of a certain species on a given area are 



FIG. 131. Diagrammatic Illustration of the Group or Strip System. 



cut off and the old stumps and roots are depended upon 

 to produce a new set of sprouts, the strongest of which 

 will later develop into trees. The coniferous trees do not 

 lend themselves at all to this system of treatment, and, 

 among the broadleaf trees, the species vary in their ability 

 to sprout. Some, like the chestnut and poplar, sprout 

 profusely; others sprout very little. 



How forests are protected: Forestry also tries to 



