542 
Journal of Agricultural Research 
Vol. XI, No. ii 
It is notable that the changes induced by the addition of sodium car¬ 
bonate were measurable hfter 5 days 1 inch from the salt in the soil 
containing 3 per cent and 2 inches from it where the moisture content 
was 9 per cent, and at the close of the 15-day period the soluble material 
had moved into the next layer of soil. The results obtained from the 
addition of this salt are given in Table X. 
JTrcAes from <So// Z oyer 
Fig. 5.—Graph of the freezing-point lowerings after to days, induced by the addition of 0.9 per cent of 
potassium chlorid to sand with 9 per cent of moisture. 
Table X .—Changes induced in the concentration of the soil solution by the addition of 
2 gm. of powdered sodium carbonate to a medium sand 
Freezing-point lowerings. 
Distance from 
9 per cent of 
3 per cent of 
salt layer. 
water. 
water. 
5 days. 
15 days. 
5 days. 
15 days. 
Inches. 
4 . 
0. 000 
O. OOO 
0. OOO 
O. OOO 
3 . 
. 000 
•013 
. OOO 
. OOO 
2. 
. 020 
. 00 
. OOO 
. 007 
1. 
7 
•349 
J 
. 220 
•303 
$ 
•255 
Freezing-point lowerings. 
Distance from 
9 per cent of 
3 per cent of 
salt layer. 
water. 
water. 
5 days. 
IS days. 
S days. 
IS days. 
Inches. 
I. 
0-332 
O. 415 
0. 225 
O. 279 
2. 
.025 
• ri 5 
. 005 
. 029 
. 000 
.015 
. OOO 
. OOO 
4 . 
. 000 
. OOO 
. OOO 
. OOO 
