18 
Bulletin 65. 
TABLE II.—MASS ANALYSES OF SOME SOILS. 
Prairie Soil, South of 
Agricultural Hall. 
Surface. 
Soil A. 
Taken 10" deep. 
Loessial Soil. 
Weld County. 
21}4" deep. 
Loessial Soil. 
Larimer County. 
6 ft. from top. 
Loess. 
Cheyenne, Wyo.* 
Silicic Acid.. 
69.356 
64.745 
72.550 
67.836 
67.100 
Sulfuric Acid. 
0.041 
0.827 
0.023 
0.025 
Carbonic Acid. 
0.016 
1.208 
0.368 
0.888 
3.670 
Chlorin. 
0.006 
0.014 
Trace. 
0.022 
• • • • • • • • 
Phosphoric Acid. 
0.466 
0.112 
0.331 
0.411 
0.110 
Potash. 
2.248 
2.295 
2.479 
2.497 
2.680 
Soda. 
1.215 
1.184 
1.498 
1.311 
1.420 
Lime. 
1.645 
2.789 
1.075 
2 481 
5.880 
Magnesia. 
1.412 
1.819 
1.245 
1.740 
1.240 
Perrons Oxid. 
0.310 
Ferric Oxid. 
5.424 
4.475 
4.420 
5.255 
2.520 
Aluminic Oxid. 
11.338 
11.717 
10.754 
11.418 
10.260 
Manganic Oxid (br). 
0.160 
0.200 
0.239 
0.109 
Moisture at 110° C. 
2.981 
3.296 
2.595 
3.569 
1 
Ignition.. 
4.044 
5.402 
2.311 
2.287 
5.090 
Sum. 
100.352 
100.080 
99.888 
99.849 
100.280 
Oxygen Equivalent to Chlorin. 
0.001 
0.003 
0.005 
Total. 
100.351 
100.077 
99.888 
99.844 
100.280 
* Analysis by Eakin’s Geology of the Denver Basin in Colorado, p. 263. 
I have chosen the sample of loess from Cheyenne because this 
is probably more nearly comparable to mine than any other at my 
disposal, and the locality is nearer by thirty miles than that from 
which the next nearest sample was taken. The sample marked 
loess from Larimer county was taken at a point about seven miles 
from the place where the sample soil A was taken. The most marked 
variations in the composition of these samples are, the sulfuric acid 
of the soil A, the carbonic acid and lime of the loess from Cheyenne. 
The sulfuric acid in the soil was probably present as calcic sulfate 
or sodic sulfate, forming a part of the “ alkali ” present in the soil. 
The carbonic acid and lime in the Cheyenne loess was doubtlessly 
present as calcic carbonate. This is of common occurrence in this 
formation; is very variable, and is not essential. With these ex¬ 
ceptions, the causes of which are usually discernible without the aid 
of chemical analysis, or even a magnifying glass, these soils agree 
as closely as samples taken within a few feet of one another might 
