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APPENDIX. 343 
The residue consists of— 
Silica. 
Alumina and oxide of iron. 
Carbonate of lime. 
Carbonate of magnesia. 
No. 263.—Soil of Cohuilla Valley, November 18.—According to your instructions I determined | 
only the sand, organic matter, lime, and saline soluble matter. The soil contains numerous 
small shells, which were not separated for the analysis. 
Constituents soluble in water : 
Alumina and oxide of iron. Phosphoric acid. 
Lime. Sulphuric acid. 
Magnesia. Chlorine. 
Soda abundant. Organic matter, 
Potash abundant. 
Soluble in acid: 
Silica. Sulphuric acid. 
Clay and oxide of iron and magnesia. 
Magnesia, (unusually large.) Soda. 
Phosphoric acid. 
Total amount soluble in water.... 1.58 p. c. 
EM nate of lime 16.59 
nd 
eal organic matter 1.30 
No. 264.— Saline soil, near Mojave River.—It effervesces strongly with dilute acid. The 
aqueous extract contains— 
Chloride of sodium. Sulphate of so 
Carbonate of sode. Sulphate of sin del (little.) 
No. 265.—Soil from San Bernardino.—A sandy loam, containing 70 per cent. of sand; con- 
sisting of angular grains of quartz; much yellow mica; fragments of a dark, undistinguishable 
rock ; occasional grains of feldspar, and a notable quantity of magnetic iron. Organic matter 
= 3.26 p. c. Qualitative tests indicated the presence of the following substances : 
Silica. Potash, (traces.) 
Alumina and oxides of iron and magnesia. Chlorine abundant 
ime. Sulphuric acid. 
Magnesia, (little.) Phosphoric acid. 
Soda. 
The color of this soil, which seems to possess all the elements of extreme fertility, is a warm 
dark-brown. 
No. 266.—Sub-soil, Bernardino Valley.—Contains 75.5 of sand, of much the same d تور‎ 
as the foregoing, except that it contains calcareous particles, effervescing strongly with dilute 
acids. It contains— 
Silie Sulphurie acid. 
Mes and oxide of iron. Phosphoric acid. i 
Carbonate of lime, 1.09 p. c. Chloride of sodium abundant. 
Magnesia, (very little.) Potash abundant. 
