ILLUSTRATIONS Ixiii 



Figure 30. Forest officer ascertaining the amount of 

 evaporation from a free water surface. Fort 

 Valley Forest Experiment Station, Flag- 

 staffj Arizona 90 



Figure 31. Forest Ranger with his pack horses traveling 

 over his district. Meadow Creek, foot of 

 Mt. Wilson, Montezuma National Forest, 

 Colorado 102 



Figure 32. A plank of Incense cedar affected by a dis- 

 ease known as "pin rot." By cutting the 

 cedar timber when it is mature this can be 

 largely avoided. Lassen National Forest, 

 California. Photo by the author . . . 114 



Figure 33. The western pine forests will some day be a 

 great source for naval stores. By distilling 

 the crude resin of the Jeffrey pine a light 

 volatile oil — abietene — is secured which has 

 great healing and curative properties. Las- 

 sen National Forest, California. Photo by 

 the author 114 



Figure 84. A forest fire lookout station at the summit of 

 Mt. Eddy. Mt. Shasta in the background. 

 California 124 



Figure 35. A forest fire lookout station on the summit 

 of Brokeoff Mountain, elevation 9,500 feet. 

 Lassen National Forest, California. Photo 

 by the author 128 



Figure 36. Turner Mountain lookout station, Lassen 

 National Forest, California. This is a 10 

 ft. by 10 ft. cabin with a stove and with 

 folding bed, table, and chairs. The forest 

 officer stationed here watches for forest fires 

 day and night throughout the fire season. 

 Photo by the author 128 



Figure 37. A fire line cut through the low bush-like 

 growth of "Chaparral" on the Angeles Na- 



