36 THE SCHOOL BOOK OF FORESTRY 



flow of a river is speeded up ten times, this raging 

 torrent will be able to carry one million times as 

 much foreign material as it did when it was 

 flowing at a normal rate of speed, causing inex- 

 pressible damage and destruction of life and 

 property. 



The protection afforded by forests on the 

 water-sheds of streams furnishing the domestic 

 water supply for cities and towns is becoming 

 more fully realized. A large number of cities and 

 towns have purchased and are maintaining muni- 

 cipal or communal forests for this very reason. 



