Oct. 2 5 ,1915 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 
/-/EAl/K SAA/DK LOAM 
1 ;:; 
k, A ° 
50.5 
KO.ff 
| a7 
Go.s 
f’o 
JL 
f 
/ 
/ 
*■ 
./ 
\ 
9 /O // /2 /3 /4 15 9 /O // /S /3 /4 /5 
PER CENT0PP7O/STC'f?E 
EXPLPNPT/Ofd; 
——— Wafer moved from mo/sf so//af 40 °c. fo dry so//af O °c. 
j> m n » *> ** O C, n ' " }t ” 40°c. 
wmwm » » » » ” »* 20°c. » •> » « 0 0 c. 
—————ts » >> » t* »» 0°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 (1) that this amount is nearly 
twice as great in the temperature amplitude of 40° as in 20° C., (2) that 
