}20 THE PRINCIPLES OF HANDLING WOODLANDS 



and hail-storms, by inundation by water, by exposure to 

 acid fumes from smelters, etc. For a full discussion of 

 these various injuries and the methods of protection from 

 them, the reader is referred to special works on forest 

 protection, of which Dr. Schlich's "Manual of Forestry, " 

 Volume IV, is recommended. 



