74 GEOLOGY OF ILLINOIS. 



The following analysis of the waters, from three of these springs, were made 

 in Chicago, the two first, by Dr. J. V. Z. Blaney, and the last, by Mr. Geo. A. 

 Mariner, and gave the following results, as the total number of grains of solid 

 mineral matter in an imperial gallon of water : 



NUMBER 1. 



Sulphate of Lime 2.0852 



Chloride of sodium, a trace. 



Alumina, and a trace of iron 7268 



Bi-carbonate of Lime 17.4315 



" Magnesia 12.5-750 



" Soda 10.9895 



" Potash, a trace. 



Organic matter, a trace. 



Silica. , .8177 



Total solid matter in imperial gallon . . , 44.6257 



NUMBER 2. 



Bi-carbonate of Iron, and trace of Alumina 2.1352 



" Lime 23.2238 



" Magnesia 11.7799 



" Soda 10.9895 



" Potash, a trace. 



Silica 1.7036 



Chloride of sodium, a trace. 



Organic matter, a trace. 



Total solid matter in one imperial gallon 49.8320 



NUMBER 3. 



Carbonate of Lime 14.600 



" Magnesia 8.950 



" Iron 060 



" Soda and potassa 1.320 



Chloride of sodium 003 



Sulphate of lime, a trace. 



Silica 1.400 



Free carbonic acid. . . 11.683 



Total grains in one gallon 38.016 



