504 



STATE BOARD OF AGRICULTURE. 



two ways: (1) it is quantitatively about the same for all diverse classes 

 of soil, and qualitatively the same for both amplitudes of temperature, 

 and (2) it is attained at entirely different moisture contents in the 

 various soils, and at a comparatively low percentage of moisture. On re- 

 ferring to the data in table 2 it will be seen that the maximum thermal 



FIG. 2. CURVES SHOWING MOVEMENT OF MOISTURE FROM WARM TO COLD 

 COLUMN OF SOIL OF UNIFORM MOISTURE CONTENT. 



water transference at the amplitude of 20° C. is 0.90 per cent for light 

 sandy loam, 0.93 for heavy sandy loam, 1.19 for silt loam, 1.07 for Clyde 

 silt loam, and 0.99 for clay; at' the temperature amplitude of 40° C, it 

 is 2.88 per cent for light *^sandy loam, 3.02 for heavy sandy loam, 3.68 

 for silt loam, 3.27 lor'ciyde sill loam, and 3.20 for clay. It should be 



