40 
Bulletin 65. 
present in the soil are sodic, magnetic and calcic sulfates, and sodic 
chlorid. This is not the order, according to the respective quan¬ 
tities in which they occur in the soil, but in the incrustation formed 
on the top of the soil. There is an order, seemingly, in which the 
salts come to the surface or are brought there by capillary action, 
the sodic and magnesic sulfates forming some 80 per cent, of the 
total salts brought to the surface and deposited from the solutions 
in this soil. The character of these deposits, these alkalies, will vary 
in different localities. This variation undoubtedly depends upon 
the nature of the solutions in the soil, i. e., the salts present in the 
ground water, rather than upon the nature of the water extract 
which we may be able to make of the soil. The salts present in the 
ground waters are intermediate in the order of their relative quan¬ 
tities between the water-soluble in the soil and the alkali incrusta¬ 
tion, but are of the same kind. The analyses already given of the 
water-soluble salts, and those given in the following tables, repre¬ 
sent the extremes for our soil. 
TABLE XVII.—ANALYSIS OP ALKALI FROM SOIL A, JUNE 23, 1897. 
Per cent- 
Silicic Acid. 0.282 
Sulfuric Acid. 53.637 
Carbonic Acid. 0.513 
Chlorin. 2.103 
Potassic Oxid. 0.520 
Sodic Oxid. 28.259 
Calcic Oxid.'. 3.097 
Magnesic Oxid. 9.136 
Aluminic and Ferric Oxids ... 0.090 
Manganic Oxid. 0.117 
Ignition. 3.112 
Sum.100.596 
Oxygen Equivalent to Chlorin. 0.474 
Total.100.122 
Combined. Per cent. 
Calcic Sulfate. 7.518 
Magnesic Sulfate. 27.408 
Potassic Sulfate. 0.963 
Sodic Sulfate. 53.682 
Sodic Chlorid. 3.470 
Sodic Carbonate ,. 1.237 
Sodic Silicate. 0.572 
Aluminic and Ferric Oxids ... 0.090 
Manganic Oxid. 0.117 
Ignition . 3.112 
Sum. 98.168 
Excess of Sodic Oxid. 1.954 
Total.100.123 
TABLE XVIII.—ANALYSIS OF ALKALI FROM SOIL A, JULY 5, 1897. 
Per cent. 
Silicic Acid. 0.129 
Sulfuric Acid. 52.127 
Carbonic Acid. 0.488 
Chlorin. 5.574 
Potassic Oxid. 0.315 
Sodic Oxid. 29 785 
Calcic Oxid. 1.369 
Magnesic Oxid. 9.684 
Aluminic and Ferric Oxids ... 0.111 
Manganic Oxid. 0.101 
Ignition . 1.571 
Sum.101.254 
Oxygen Equivalent to Chlorin. 1.256 
Total. 99.998 
Combined. Per cent. 
Calcic Sulfate. 3 323 
Magnesic Sulfate.29.059 
Potassic Sulfate. 0.580 
Sodic Sulfate.54.217 
Sodic Chlorid. 9.198 
Sodic Carbonate. 1.177 
Sodic Silicate. 0.262 
Aluminic and Ferric Oxids_ 0.111 
Manganic Oxid. 0.101 
Ignition. 1.571 
Sum.99.601 
Excess of Sodic Oxid. 0.396 
Total.99.997 
