Oct. 25, I915 



Temperature and Capillary Moisture in Soils 



163 



loam, and Miami clay. There were three different moisture contents 

 used for each soil, designated as low, medium, and high. The duration 

 of all experiments was about eight hours. The numerical data obtained 

 are shown in Table IV. The accompanying figures 5 to 10 represent 

 these same data graphically. Each soil has two charts: The one to the 

 left is for the temperature amplitude of 40°, and the one to the right is 

 for the temperature range of 20° C. The abscissas in every case repre- 

 sent the percentage of moisture content and the ordinates the percentage 

 of water moved either from the moist and warm column to the dry and 

 cold column of soil, or from the moist and cold column to the dry and 

 warm column of soil. The upper curves of each chart represent the 



EXPLy^NA^T/O/^: 



■ 14^3 fer moi/ed from mo/sf so// af ^Cc. fo c/ry so// 3/ O 'c. 

 . „ „ „ „ „ .. Cc. » .. » " ^0°c. 



.. o°c: 



20' c. .' 

 O'c. - 



^0°c. 



Fig. 7. — Curve showing the percentage of moisture moved from a moist and warm column to a dry and cold 

 column of heavy sandy loam, and from a moist and cold to a dry and warm column of heavy sandy 

 loam. 



percentage of water movement that took place from the moist and warm 

 soil to the dry and cold soil, while the lower curves show the movement 

 of water that occurred from the moist and cold soil to the dry and warm 

 soil. As in the preceding case, the precentage of moisture moved is based 

 upon the difference in percentages of moisture contained in the dry soil 

 of the beginning and end of the experiment. 



Considering first the numerical values showing the amount of water 

 moved from the moist and warm column of soil to the dry and cold 

 column of soil, which are graphically represented by the upper curve of 

 each chart (fig. 5 to 10), it will be seen (i) that this amount is nearly 

 twice as great in the temperature amplitude of 40"" as in 20° C, (2) that 



