356 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 13 



FIGURE 8 



Comparison of evaporation rates with black-cup and white-cup 

 atmometers on the southern and northern exposures of a canyon. 



Station Bl, southern exposure — solid lines 



Station B2, northern exposure — dash lines 



Upper solid and upper dash lines show average daily evaporation 



of black-cup atmometers. 



Lower solid and dash lines show average daily evaporation of 



white-cup atmometers. Numbers represent cubic centimeters. 



