500 SCIENCE OF HOME AND COMMUNITY 



Some attack the living tree, some attack only the dead and 

 dying trees, and others do harm to sawed lumber and wood 

 products. 



Conservation of forests. Conservation of forests simply 

 means that the forests should be cared for in a scientific 

 manner. By proper methods of forestry, it is possible to 

 cut some of the trees and still leave enough for protective 

 cover. In cutting trees it is not well to cut all in a certain 



FIG. 197. Larch trees killed by the larva of a small sowfly. Adirondack 

 Mountains, New York. 



area, but only a few of the largest should be cut each year, 

 leaving the rest to serve their protective purpose. By 

 leaving spaces where seeds may fall and germinate and 

 seedlings grow, a supply of young trees is kept constantly 

 growing to take the place of those which are being cut out. 

 In this way a forest may be so managed as to give a constant 

 supply of timber for centuries, unless it is overtaken by some 

 calamity such as a fire or a ravage of insects. Through 

 proper care the forests still left may continue to furnish 



