28o 
Journal of Agricultural Research 
Vol. IX, No. 9, 
9 JEM 6 
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6 /&M. 8 
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Fig. i.—G raphs showing the hourly transpiration rate of alfalfa, the hourly evaporation rate from different 
surfaces, and the weather conditions during a three-day period at Akron, Colo. The heavy lines (with 
points marked by circles) represent the observed data. The light lines (with points marked by dots) 
represent the transpiration rate, with the scale of ordinates so chosen that the area under the transpira¬ 
tion graph is equal to the area under the accompanying evaporation graph. 
