FORESTRY 323 
which are New York and Pennsylvania; while Michigan, 
Minnesota, and other States are following their example. 
185. Reforestation.—In many regions where forests 
have been removed completely, and on the treeless prairies 
and plains, trees must be started and a forest cover gradu- 
ally developed. In European countries, where many hill 
slopes had been cleared of all trees and the soil gullied and 
washed away, reforestation has been conducted on a large 
scale. Many a hilly Oriental country, now barren, was once 
forest-clad and fertile, as Palestine, whose streams have 
disappeared, and Mesopotamia, once a garden watered by 
the Euphrates, but now a desert. 
In the United States extensive reforestation is required 
only on the prairies and plains, where active measures are 
taken to stimulate tree-planting; and perhaps eventually 
some real forests may be developed in these treeless regions. 
It. may be well to call attention to the fact that tree-plant- 
ing, such as “Arbor Day’’ stimulates, is not forestry; and 
that the real problem of forestry in the United States to- 
day is the proper management of existing forests. 
