162 
Journal of Agricultural Research 
Vol. V, No. 4 
dry and the other half with moist soil, and the two columns were sep¬ 
arated only by a circular piece of cheesecloth, in order to facilitate the 
separation of the two columns for moisture-movement determinations. 
QUARTZ SA/VD 
a" 
US o./ 
ktfi 
- 
«... 
-- 
lug °, 
f L 
? c 
s t 
5789 /0 / 2 34-5 6 7 6 
PER CENT OF MO/STORE • 
? 9 A 
EXPLAN AT/ON: 
■mu ■ Water moi/ect from mo/s f sot'/ st &0°C. to drjr so// &/ 0°C. 
........ „ « « " " 0 °c. " " " *' 40 °C- 
— „ „ „ » « *t BO*C. >• ** ” •* 0 0 c 
_ « « « * " 0*c « « « " 20°C. 
Fig. s-—C urve showing the percentage of moisture moved from a moist and warm column to a dry and cold 
column of quartz sand, and from a moist and cold to a dry and warm column of quartz sand. 
The tubes were then inserted in the boxes shown in figures i and 2, and 
that portion of the tubes containing the moist soil was kept at 20° and 
40°, while that part which held the dry soil was maintained at o° C. 
M/sAM/ GAIA/Dr LO/4A7 
Fig. 6 .—Curve showing the percentage of moisture moved from a moist and warm column to a dry and cold 
column of Miami sandy loam, and from a moist and cold to a diy and warm column of Miami sandy 
loam. 
In another set of tubes these temperatures were reversed. The soils 
employed were the same as those previously described—namely: Quartz 
sand, light and heavy Miami sandy loam, Miami silt loam, Clyde silt 
