The Ground Water. 
31 
TABLE XVII.—ANALYSIS OF WATER FROM WELL C, JUNE 13, 1898. 
Analytical Pei * 
Results. Cent. 
Silicic Acid. 0 656 
Sulfuric Acid. 44.875 
Carbonic Acid. 3 517 
Chlorin. 5.144 
Sodic Oxid. 18.108 
Potassic Oxid. 0.058 
Calcic Oxid. 14.445 
Magnesic Oxid.. 7.167 
Ferric and Alu. Oxids. 0.026 
Manganic Oxid. 0.041 
Ignition. 6.911 
Sum.100.948 
Oxygen Equivalent to Chlorin 1159 
Total. 99.789 
Per 
Combined. Cent. 
Calcic Sulfate. 35.054 
Magnesic Sulfate. 21 520 
Potassic Sulfate. . 0107 
Sodic Sulfate. 17.517 
Sodic Chlorid . 8.487 
Sodic Carbonate. 8.474 
Sodic Silicate_:. 1.333 
Ferric and Alu. Oxids. 0.026 
Manganic Oxid. 0.041 
Ignition. 6.911 
Sum. 99.470 
Excess Sodic Oxid. 0.316 
Total. 99.786 
§ 86. The alkali or incrustation which collected on the surface 
of the soil is essentially a mixture of sodic and magnesic sulfates in 
the ratio of two to one. These two salts make up 80 per cent, of 
the whole mass. Calcic sulfate is subordinate in quantity, with 
sodic chlorid and carbonate still more so. 
§ 87. In the first two inches of the soil we find that the 
soluble salts consist largely of calcic, magnesic and sodic sulfates, 
which together form 78.3 per cent, of them, with the calcic sulfate 
predominant. In the second two inches the calcic sulfate consti¬ 
tutes almost 51 per cent, of the water-soluble portion of the soil, with 
magnesic sulfate subordinate and sodic sulfate absent. On the 
other hand, sodic silicate, which is very subordinate in the alkali 
and ground water, is here next in quantity to the calcic sulfate, and 
the potassic sulfate, which is present in scarcely more than traces in 
the alkali given, makes about 1-16 of the water-soluble portion of 
the second two inches of the soil. The potassic salts in the alkali 
incrustations which I have examined and which were formed as 
efflorescences, are sometimes higher than in the one given, amount¬ 
ing in some cases to about 1 per cent. In an alkali from South 
Park, Colo., the potassic salts were a little over 8 per cent., but the 
conditions are wholly different from those prevailing in our plot. 
§ 88. The variety of salts in the water-soluble portion of the 
soils seems to be greater and the relative quantities of the subordi¬ 
nate ones are much more nearly equal than in the alkali or the 
water. Reference to the analyses of the other water-soluble portions 
of the soils will show a tendency in this direction in the first two, 
but it is more marked in the second two inches of soil. In no case 
do we have an increase in the amount of the more soluble sodic and 
magnesic sulfates in the second two inches of soil, while that of the 
less soluble calcic sulfate is quite marked. 
