Oct. 25, 1915 
Temperature and Capillary Moisture in Soils 
157 
in figures 1 and 2. That part of the tubes which contained the moist 
soil was kept at 20° and 40° and the part which contained the dry soil 
was maintained at o° C. The experiment was allowed to run'about 
eight hours. If during this period the dry and cold soil gained any 
moisture, it obtained it by the condensation of vapor which was produced 
at the warm and moist soil. Since the dry soil possesses a high absorb- 
tive power for water, it was assumed that it abstracted the vapor from 
the air space and that this air space was thus prevented from attaining 
an equilibrium. Five different classes of soil were used: Quartz sand, 
Miami light sandy loam, Miami silt loam, Clyde silt loam, and Miami 
clay. The moisture contents employed for each soil were three: Low, 
medium, and high. The percentage of moisture moved from the warm 
and moist column of soil to the cold and dry column of soil represents 
the difference between the percentages of moisture found in the dry 
soil at the beginning and end of the experiment. The results obtained 
are presented in Table III. 
Table III .—Movement of moisture from a warm and moist column of soil to a cold and 
dry column of soil , with an air space between the two columns 
Kind and temperature of soil. 
Percentage of moisture in soil. 
Quartz sand: 
At beginning of experiment. 
2. 90 
6.83 
*3- 52 
Movement from moist column at 20° to dry column 
at o° C. 
.051 
.046 
. 048 
Movement from moist column at 40° to dry column 
at o° C. 
.286 
. 280 
.294 
Sandy loam: 
At beginning of experiment.. 
7*23 
10. 27 
15.82 
Movement from moist column at 20° to dry column 
at o° C. 
.0238 
*0313 
. 0246 
Movement from moist column at 40° to dry column 
at o° C.. 
. 211 
•253 
. 223 
Silt loam: 
At beginning of experiment. 
9. 16 
14. 52 
16. 40 
Movement from moist column at 20° to dry column 
at o° C. 
. 024 
•033 
.0273 
Movement from moist column at 40° to dry column 
at o° C... 
00 
• 273 
.288 
Clyde silt loam: 
At beginning of experiment. 
9- 85 
15*51 
22.39 
Movement from moist column at 20° to dry column 
at o° C.. 
. 028 
.031 
. 040 
Movement from moist column at 40° to dry column 
at o° C.. 
. l6 
. 22 
.28 
Clay: 
At beginning of experiment. 
10. 77 
15- 36 
20.35 
Movement from moist column at 20° to dry column 
at o° C. 
. 08 
.06 
.09 
Movement from moist column at 40° to dry column 
at o° C. 
. 18 
•36 
. 26 
5773°—15-2 
