WHAT FORESTRY IS AND WHAT IT DOES 195 



kind is often made by starting another fire some distance 

 ahead of the principal one, so that when the two fires meet, 

 they will die out for want of fuel. In well-kept forests, 

 strips or lanes, free from inflammable material, are often 

 purposely made through the forest area to furnish pro- 



FiG. 133. — A Top Fire near Bear Canyon, Arizona. 



tection against top fires. Carefully managed forests are 

 also patrolled during the dry season so that fires may be 

 detected and attacked in their first stages. Look-out 

 stations, watch-towers, telephone-connections and signal 

 stations are other means frequently resorted to for fire 

 protection and control. Notices warning campers and 



