106 



OUR FORESTS 



the earth's surface. They prevent soil from being washed away, 

 and they hold moisture in the ground. The devastation of im 

 mense areas in China and 

 considerable damage by 

 floods in parts of Switzer 

 land, France, and in Penn 

 sylvania has resulted where 

 the forest covering has 

 been removed. No one 

 who has tramped through 

 our Adirondack forest can 

 escape noticing the differ 

 ences in the condition of 



Working to prevent erosion after the removal streams surrounded by 

 of the forest in the French Alps. forest and those which 



flow through areas from 



which trees have been cut. The latter streams often dry up 

 entirely in hot weather, while the forest-shaded stream has a 

 never failing supply of crystal water. 



The city of New York owes much of its importance to its posi 

 tion at the mouth of a great river with a harbor large enough to 

 float the navies of the 

 world. This river is 

 supplied with water 

 largely from the Adi 

 rondack and Catskill 

 forests. Should these 

 forests be destroyed, it 

 is not impossible that 

 the frequent freshets 

 which would follow 

 would so fill the Hud 

 son River with silt and _ 



Erosion at Sayre, Pennsylvania, by the Ohemnng 

 debris that the ship River. (Photograph by W. C. Barbour.) 



channels in the bay, 



already costing the government hundreds of thousands of dollars 



a year to keep dredged, would become too shallow for ships. If 



