Oct. 25. igis Temperature and Capillary Moisture in Soils 



157 



in figures i 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 0° 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 



Movement from moist column at 20° to dry column 



ato°C 



Movement from moist column at 40° to dry column 

 _ ato°C 



Sandy loam : 



At beginning of experiment 



Movement from moist column at 20° to dry column 



ato° C 



Movement from moist column at 40° to dry column 

 ato°C 



Silt loam : 



At beginning of experiment 



Movement from moist column at 20° to dry column 



ato°C 



Movement from moist column at 40° to dry column 



ato° C 



Clyde silt loam: 



At beginning of experiment 



Movement from moist column at 20° to dry column 



ato° C 



Movement from moist column at 40° to dry column 



at 0° C 



Clay: 



At beginning of experiment 



Movement from moist column at 20° to dry column 



ato°C 



Movement from moist column at 40° to dry column 



ato°C 



2. 90 

 .051 

 .286 



7-23 

 .0238 

 . 211 



9. 16 



. 024 



.278 



9-85 

 .028 

 .16 



10.77 

 .08 



6.83 

 . 046 



10. 27 

 •0313 

 •253 



14.52 

 •033 

 •273 



15-51 

 .031 

 . 22 



15-36 

 .06 

 •36 



13-52 

 .048 

 •294 



15.82 

 . 0246 

 .223 



[6. 40 

 .0273 



22.39 

 . 040 

 .28 



20.35 

 .09 

 .26 



5773°- -15- 



