EVAPORATION AND CAUSAL FACTORS. 



61 



20 k^ 

 10 



67 8 9 10 11 MT. 1 23^5 6 7 8 9 10 II NOON 1 234-56 



FIG. 32. Series^33, showing evaporation, transpiration, and the factors concerned 

 for September 8-9, 1919. 



A. Sunlight. 



B. Temperature. 



C. Saturation deficit. 



D. Wind velocity. 



E. Evaporation, 



blotting paper 

 atmometer. 



F. Evaporation, 



porous cup 

 atmometer. 



G. Absolute humidity. 

 H. Barometric pressure. 



I. Transpiration of 

 potted plant 



(Cow-beet) . 

 K. Transpiration of 

 cut leaves in 

 potometers 

 (Cow-beet) . 



L. Relative humidity. 

 M. Vapor pressure 



deficit. 

 N. Dew-point depression. 



