536 
Journal of Agricultural Research 
Vol. XI, No. ii 
In the next series of experiments another but lighter silt loam was 
used as the medium for studying the changes brought about in the con¬ 
centration of the soil solution in the soil by the addition of sodium 
chlorid, 0.5 per cent of the salt was added in solution to 100 gm. of the 
soil, glass tubes being employed as the containers. An additional feature, 
notably the effect of different water contents upon the rate of change 
in the concentration of the soil solution, was included in this series. 
Fig. 2.—Graph of the freezing-point-lowerings after 5 days, induced by the addition of 2 per cent of 
potassium chlorid to silt loam with 20 per cent of moisture. 
According to data presented in Table II, an increase in the concentration 
of the soil solution was measurable 2 inches from the salt layer after 5 
days, becoming more apparent after 10 days; and at the close of the 20- 
day period the movement of the soluble material had taken place through¬ 
out the soil column. An examination of these data also reveals that the 
rate of movement through the soil containing 20 per cent of water was 
somewhat more rapid than it was through the soil which contained 10 
per cent of water. 
