38 
Bulletin 65. 
TABLE XV.—WATER-SOLUBLE, SOIL D, FIRST TWO INCHES. 
Per cent. 
Silicic Acid. 2.261 
Sulfuric Acid. 48.354 
Phosphoric Acid.. 
Carbonic Acid. 0.768 
Chlorin. 2.670 
Potassic Oxid. 3.792 
Sodic Oxid. 5.604 
Calcic Oxid. 22.084 
Magnesic Oxid. 5.486 
Aluminic and Ferric Oxids ... 0.011 
Manganic Oxid. 0.662 
Ignition. 8.789 
Sum.100.477 
Oxygen Equivalent to Chlorin. 0.602 
Combined. Per cent. 
Calcic Sulfate.53.593 
Magnesic Sulfate.16.473 
Potassic Sulfate. 7.015 
Sodic Sulfate. 4.682 
Sodic Chlorid. 4.405 
Sodic Carbonate. 1.841 
Sodic Silicate. 0.282 
Aluminic and Ferric Oxids_ 0.011 
Manganic Oxid. 0.662 
Ignition. 8.789 
Sum.97.753 
Excess of Silicic Acid. 2.122 
Total.99.875 
Total. 99.875 
The percentage of water-soluble equalled 0.800. 
TABLE XVI.—WATER-SOLUBLE, SOIL D, SECOND TWO INCHES. 
Per cent. 
Silicic Acid. 3.354 
Sulfuric Acid. 44.392 
Phosphoric Acid. Trace 
Carbonic Acid. 5.738 
Chlorin. 0.632 
Potassic Oxid. 1.310 
Sodic Oxid. 5.594 
Calcic Oxid. . 27.656 
Magnesic Oxid. 5.895 
Aluminic and Ferric Oxids ... 0.443 
Manganic Oxid. 0.227 
Ignition. 4.919 
Sum.100.160 
Oxygen Equivalent to Chlorin. 0.142 
Total.100.018 
Combined. Per cent. 
Calcic Sulfate. 67.116 
Magnesic Sulfate. 7.397 
Magnesic Carbonate. 7.202 
Potassic Carbonate. 1.922 
Sodic Chlorid. 1.042 
Sodic Carbonate. 3.265 
Sodic Silicate. 6.164 
Aluminic and Ferric Oxids ... 0.443 
Manganic Oxid. 0.227 
Ignition. 4.919 
Sum. 99.697 
Excess of Silicic Acid. 0.321 
Total.100.018 
The percentage of water-soluble equalled 0.864. 
§ 77. The quantity of water used in extracting the soils 
ranged from 18 to 45.5 litres, and the time of extracting from 14 to 
68 days. It was thought that the long time and large quantities 
of water used might have made some differences in the results 
which a quick extraction would make evident, but two experiments 
made on quantities of 10 and 150 grams each failed to show any¬ 
thing of sufficient interest to lead us to prosecute the work. The 
silicic acid, sulfuric acid, lime and magnesia extracted from 10 
grams in from 30 to 45 minutes differed but a few hundredths of a 
per cent., when calculated on the soil used, from the figures obtained 
in the more carefully prepared extract. In the experiment with 
150 grams the alkalies and magnesia with the silicic acid went into 
solution more readily than the last portions of lime and sulfuric 
acid. This is entirely in accordance with the properties of these 
