HYDROLOGY. 165 



The exact depth of the well is 1,475 feet and 4 inches. At the 

 bottom, a very hard rock is said to have been struck, which was be- 

 lieved to be granite, and which may have been one of the Archaean 

 rocks, as they rise into that horizon occasionally. The surface of the 

 well is 42 feet above Lake Michigan; its bottom 855 feet below the 

 ocean level. 



Flowing water was obtained at 1,340 feet, being in the upper por- 

 tion of the St. Peters sandstone. The pressure at the surface is suf- 

 ficient to raise a column of water 104 feet above the surface, or 146 

 feet above the lake, which differs only two feet from that obtained 

 from the same formation at Western Union Junction. The discharge 

 of water is 225 gallons per minute. Temperature, 69.1° Fahr. 

 Our deep seated springs range from 47° to 48° Fahr., as taken in 

 connection with field work, during the summer season, when they 

 would be warmest, if they vary at all. This seems to show that the 

 water of the well is influenced by the depths from which it comes. 



The following is an analysis of the water by Dr. C. F. Chandler: 



Grains per U. S. Gallon. 



Chloride of sodium 306 . 9436 



Chloride of potassium ■ 14.4822 



Chloride of lithium 0.1062 



Chloride of magnesium 54.9139 



Chloride of calcium 27.8225 



Bromide of sodium 0.1873 



Iodide of sodium trace. 



Sulphate of lime 169.8277 



Sulphate of baryta • trace. 



Bicarbonate of Ume 13.6585 



Bicarbonate of iron 0.6044 



Bicarbonate of manganese 0.1742 



Phosphate of lime 0.03S3 



Biborate of soda trace. 



Alumina 0.1283 



SiUca 0.4665 



Organic matter trace. 



Total 589.2536 



Density IM'i^ 



The large variety and quantity of salts contained in this water 

 have naturally attracted much attention, and experience will doubt- 

 less soon demonstrate the specific medicinal effec'C of the combination 

 here presented. 



At first thought it would seem not a little remarkable that so saline 

 a water should be obtained from the St. Peters sandstone, a formation 



