134 DRY-FARMING 
0 0.545 
32 ae 
40 2.862 Pie 
50 ae sss 
. ee at 3k. aante oaiceee 
at Loe ae. 2.236 
a Pee Sees ean ee 
90 ai aie 
100 eat oe 
water during the fall and winter when the tempera- 
ture is low and the moisture usually abundant, and 
the greater difficulty of storing the rain that falls 
largely, as in the Great Plains area, in the summer, 
when water-dissipating forces are very active. This 
law also emphasizes the truth that it is in times of 
warm weather that.every precaution must be taken 
to prevent the evaporation of water from the soil 
surface. 
It is of course well understood that the atmos- 
phere as a whole is never saturated with water vapor. 
