ii8 
Journal of Agricultural Research 
Vol. XXIV, No. a 
should be given much less weight in the total, the general scale of tempera¬ 
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temperatures at 8 p. m., 12 m. and 4 a. m., and the total is divided by 15. 
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Len^hP of arrow indicstes relative amount of air movement 
P<^cDortion shaded indicates extent of artificial shading 
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I—Transpiration in relation to saturation deficits in 1917. Numbers opposite circles give month 
and day of observation. 
pin figure i the results of such computations of vapor deficit for 84 
periods during the season of operations are plotted with the daily tran¬ 
spiration sums. The basic data will not be tabulated, since it is volumi¬ 
nous and has no precise value. Instead, the general character of each 
period is indicated by symbols on the diagram. The mean curve which 
may be obtained from the 84 points is only suggestive in showing— 
