The: Fixation cm Nitrogen. 21 
foot were taken as one sample and gave 4.27 percent soluble in 
water. 
ANALYSES 
XVI 
XVII 
Water-Soluble 
Water-Soluble 
Labratory 
Labratory 
No. 632 
No. 633 
First Foot 
Second and 
Third Foot 
Percent 
Percent 
Calcic sulfate . 
. 41.882 
42.122 
Magnesic sulfate . 
. 8.747 
18.397 
Sodic sulfate . 
. 10.847 
5.747 
Sodic chlorid . 
. 34.014 
28.019 
Sodic silicate . 
. 1.276 
1.479 
Manganic oxid . 
0.070 
Ignition . 
. 3.234 
4.184 
100.000 
100.000 
These water-soluble portions were tested for nitric acid and 
there was not enough present to give a reaction with ferrous sul¬ 
fate and sulfuric acid. That the water-soluble should be made up 
so largely of calcic sulfate is what one would expect, because this 
salt, as the mineral gypsum, can be seen forming veinlets and 
small aggregations throughout the mass of the soil. This is the 
case to a greater extent in the second and third than in the first 
foot. The quantity of sodic chlorid is larger than usual but is still 
within the limits of tolerance for almost all plants. 
ANALYSES 
XVIII 
XIX 
Soii 
Soil 
Laboratory 
Laboratory 
No. 632 
No. 633 
First Foot 
Second and 
Third Foot 
Percent 
Percent 
Sand . .. 
. 48.951 
47.747 
Silicic acid (sol.) . 
. 22.377 
17.945 
Sulfuric acid . 
. 0.708 
3.194 
Chlorin . 
. 0.387 
0.599 
Phosphoric acid.'. 
. 0.156 
0.217 
Carbonic acid . 
. 3.968 
3.709 
Lime . 
. 4.624 
5.877 
Magnesia . 
. 2.650 
2.864 
Sodic oxid . 
. 0.740 
1.033 
Potassic oxid . 
. 1.082 
1.356 
Ferric oxid. 
. 4.344 
3.374 
Aluminic oxid . 
. 5.286 
7.405 
Manganic oxid . 
. 0.168 
0.675 
Water expelled at 100° . 
. 1.707 
2.933 
Ignition . 
. 2.9 8 6 ‘ 
(1.207) 
Sum. 
.100.134 
100.135 
Oxygen equiv. to chlorin. 
. 0.087 
0.135 
Total. 
. 100.047 
100.000 
Another soil in which the conditions were worse even than 
in the preceding is represented by the next sample. This ground 
