78 
GEOLOGY—RESULTS OF CHEMICAL ANALYSES. 
COMPOSITION. 
Si. 70.430, Al. 14.680, Fe. 3.047. 
Ca. .322, m. 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, he 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 OP SOLID MATTER. 
K. .218, Na. 6.574, Ca. .129, Mg. .088. 
Si. .835, Fe. trace, Cl. 2.442, C. 4.266. 
S. 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. 
