I 62 



Journal of Agricultural Research 



Vol. y, No. 4 



dry and the other half v.ith 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. 



QU/if?TZ S/^/VD 



EXPLANAT/O/y: 

 Water moi/ed from mo/sf soi/ sf ^0°C. /<? </ry so/V sf O'd-?,^ 



Fig. s-— Curve 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 colimm 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 0° C. 



A//^A^/ S/^A/Oy LOy^A7 



EXPLAA//^ T/ON: 

 Wa/er moyec^ fiiom mois^ so/7 af 40 'c. /o c/ry so// a/ 0°c. 

 — — — .. .. .. .. ,. .. O'c. .. " .. ., 40'c. 



— — — .. ., .. ., - ., 20'c. .. .. .. ., O'c. 



—.—... " ,. ., ., '. ., O'c. » " •• » 20'c. 



Fig. 6.— Curve showing the percentage of moisture moved from a moist and warm column to a dr>' and cold 

 column of Miami sandy loam, and from a moist and cold to a dry 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, JMiami silt loam, Clyde silt 



