362 THE CONIFERS (GYMNOSPERMS) — FORESTS 
college of forestry, and by practical work in the forests under 
supervision. 
Forestry has long been practiced in Europe, but it is a new 
enterprise in the United States. As the necessity for it is 
seen and as more and more forest preserves are made, open¬ 
ings will occur as foresters for greater numbers of young men. 
Figure 336. — Fire Slash. 
The scene of a great destructive fire in 1908. 
There are two methods of obtaining revenue from forests, 
one known as clear cutting, in which all the timber is removed 
and the land cleared, after which it is again planted with 
young trees. This method has two advantages, one, that 
the timber is all about the same size, and the other that no 
trees need to be injured in removing some. Selective 
cutting, the second method, has this advantage, that the 
forest can be made to produce revenue continuously, but 
