Figure -^9. At the Fort Valley Forest Experiment Station, Co 

 cnnino National F'orest, Arizona. A typical meteorological station 

 Forest officer measuring precipitation. Note the shelter which con- 

 tains thermometers and also the electrically equipped instruments to 

 record the direction and velocity of the wind. 



Figure 30. Forest officer ascertaining the amount of evaporation 

 from a free water surface. Fort ^'alley Forest Experiment Station, 

 Flagstaff, Arizona. 



