The Soil. 
33 
§ 70. The water-soluble has been determined in one set of 
general samples, but has been analyzed in only one case, that of 
sample B, taken in 1897. The analysis is not wholly satisfactory, 
showing too larp-e an excess of sodic oxid, even after using all of the 
silicic acid present. A large quantity of organic matter in an 
analysis is sometimes accompanied by an excess of soda. - This 
analysis was made on a smaller amount of material than the 
analyist was accustomed to, and other conditions did not contribute 
either to his comfort or to the accuracy of his work. The water- 
soluble amounted in this instance to 0.878 per cent, of the soil. 
TABLE VIII.—ANALYSIS OF THE WATER-SOLUBLE IN SAMPLE 
B, 1897. 
Per cent. 
Silicic Acid. 1.516 
Sulfuric Acid. 50.451 
Carbonic Acid. 0.140 
Chlorin. 1.529 
Sodic Oxid. 14.423 
Potassic Oxid. 2.517 
Calcic Oxid. 15.091 
Magnesic Oxid . 7.608 
Aluminic and Ferric Oxids... 0.152 
Manganic Oxid (br).notdet. 
Ignition. 6.885 
Sum.100.312 
Oxygen Equivalent to Chlorin-. 0.344 
Total. 99.968 
Combined. 
Per cent. 
Calcic Sulfate. 
... 36.633 
Magnesic Sulfate. 
.. . 22.824 
Potassic Sulfate. 
.. 4.659 
Sodic Sulfate. 
... 20.513 
Sodic Chlorid.. 
... 2.523 
Sodic Carbonate. 
,. . 0 337 
Sodic Silicate. 
... 3.078 
Aluminic and Ferric Oxids 
... 0.152 
Manganic Oxid . 
. .not det. 
Ignition. 
... 6.885 
Sum. 
... 97.604 
Excess of Soda.. 
... 2.400 
Total. 
. ..100.004 
§ 71. Analysis shows that the whole of the sulfuric acid in 
these soils is soluble in water and in hydrochloric acid. The soil 
•/ 
analysis of B, sample taken May 13, was made on the same sample 
that was extracted with water and the analysis of which extract is 
given above. The difference when the sulfuric acid is calculated 
into percentage of the soil is far within the limit of the analytical 
errors, being only 0.045 per cent. In regard to the order in which 
the acids and bases have been combined, it appears that there is 
but little choice. The water-soluble consists essentially of sulfates. 
The above residue was obtained by washing the soil so long as the 
water with which it was digested in the cold for twenty-four hours 
showed any trace of sulfuric acid. The water used in the particular 
case given, sample B, was not measured, but it was in all of the 
cases to be given and ranged from 18 to 45.5 litres per 1,000 grams 
of the soil. 
t 
THE WATER-SOLUBLE PORTION OF THE SOIL DIFFERENT FROM THE 
INCRUSTATION. 
§ 72. It may be well to anticipate a later discussion to the ex¬ 
tent of stating that the water-soluble in the soil is not the same, as 
the “ alkali ” that effloresces from the soil. The salts are of the same 
