On watch over forests are rangers, scientists, lookouts, loggers, work crews. Modern 

 equipment multiplies their effectiveness and cuts costs. Above: Using portable 

 power equipment to spray insect-infested lodgepole pine in Teton National Forest, 

 Wyoming. Below: Pilot Carl Nelson and District Ranger William J. Trygg land 

 their amphibious plane on Thomas Lake in Superior National Forest to get data 

 on fire hazard rainfall, humidity, dryness of vegetation. Planes supplement regu- 

 lar lookouts when visibility is low and fire danger is high. Nelson and Trygg cover 

 in hours an area that old-time rangers in canoes and afoot took months to survey. 



