204 REPORT OF THE 



The water of Detroit river at the same time contained the 

 following constituents: 



Sulphate of potassa, . 000283 



Sulphate of soda . 000750 



Phosphate of lime, 0. 003110 



Alumina 0.001050 



Silica, . 000500 



Carbonate of lime, . 003300 



■Carbonate of iron, . 000814 



Total 0.009807 



By far the most important mineral waters of the Lower Pe- 

 ninsula are those charged with chlorid of sodium. The ferru- 

 ginous sandstones of the lower part of the State, give origin, 

 however, to numerous springs which are strongly chalybeate, 

 while the bituminous rocks of the Huron and Upper Helderberg 

 groups, become the source of strongly sulphureous waters. 

 No formal investigations have been made of any of these 

 springs. The following analysis, however, by Mr. McNeill, be- 

 fore quoted, was made upon the water of a spring issuing upon 

 the land of Solomon Mann, Esq., Ann Arbor: 



Temperature, 50° Fah. 

 Specific gravity, 1.001. 



Constituents of the solid matter: 



Carbonate of lime . 022800 



Carbonate of magnesia, . 008936 



Carbunate of iron . 000468 



Chloride of sodium, . 000488 



Iodide of sodium, trace. 



Sulphate of soda, . 000971 



Carbonate of soda . 000042 



Sulphate of potash 0.000531 



Silicic acid 0.001200 



-Organic matter, , 0.002500 



Total, 0.037936 



Free and partially combined carbonic acid, 028500 



The quantity of iron in this water is'greater than that in the 

 chalybeate waters of Bath, England, and Karlsbad and Teplitz, 



