78 GEOLOGY — RESULTS OP CHEMICAL ANALYSES. 



COMPOSITION. 



Si. 70.430, Al. 14.680, Fe. 3.047. 



Ca. .322, Na. 9.623, H. 1.255 = 99.357. 



The silica found in the water exists in combination with an alkaline base ; since upon evapo- 

 ration the whole of the residuum is again redissolved in water. But if treated with some 

 strong acid previous to evaporation, one part of silica is obtained in 11,976 parts of water. 

 From the quantity of alkali found, the silica, which separated very soon upon exposure to the 

 air, and which floats in the basins, must, at least in part, be in combination with an alkali, as 

 an alkaline silicate, which the carbonic acid of the atmosphere decomposes, forming an alkaline 

 carbonate. The result of analysis is as follows : 



Specific gravity of water, 1.00085. In 10,000 parts there are 13.82 parts of solid matter, 

 not considering the excess of carbonic acid which is expelled during evaporation.- 



COMPOSITION OF SOLID MATTER. 



K. .218, Na. 6.574, Ca. .129, Mg. .088. 



Si. .835, Fe. trace, CI. 2.442, C. 4.266. 



8. 1.099 = 15.651. 



The following arrangement may represent the presumed combinations as they exist in solution : 



Water '. 9984.856 



Chloride of potassium .343 



Chloride of sodium 3.501 



Chloride of magnesium .209 



Sulphate of lime .313 



Sulphate of soda - -- 1.624 



Silicate of soda - 1.407 



Carbonate of soda 5.916 



Free carbonic acid 1.831 



10000.000 



The carbonic acid which I have represented as free evidently exists in combination with bases 

 forming bicarbonates. 



