30 GEOLOGICAL SURVEY OF WISCONSIN. 



The following species have been found in the mining region of 

 Lake Superior, in Michigan, and may therefore be found in similar 

 localities in Wisconsin: 



DonieyMte (Arsenical Copper). Datolite. 



Algodonite (Arsenical Copper). Pectolite. 



Whitneyite (Arsenical Copper). Chlorastrolite. 



Argentite (Sulphuret of Silver). Apophyllite. 



.Bornite (Purple Copper ore). Natrolite. 



Covellite (Indigo Copper). Analcite. 



Cerargyrite (Horn Silver). Chabazite. 



Fluorite (Fluor Spar). Harmotome. 



Melaconite (Black Oxide of Copper). Stilbite. 



Gothite (Oxide of Iron and water). Heulandite. 



Manganite (Gray Oxide of Manganese). Serpentine. 



Wollastonite (Tabular Spar). Gentbite. 



Pyroxene. Dclessite. 

 Pseudomalachite. 



MINERAL WATERS. Mineral waters being included among the 

 numerous objects to be investigated by the survey, a beginning has 

 been made in the collection of facts and information in regard to 

 them, and arrangements made by which it is hoped that all desirable 

 information will be at hand, ready for the final report. 



Mr. Gustavus Bode, of the firm of J. H. Tesch & Co., Milwaukee, 

 having already analyzed a number of these waters, arrangements were 

 made with him to furnish corrected copies of his work for the use of 

 the survey, and to make such further analyses as should be deemed 

 advisable. 



The accompanying table will show in the most compact and conve- 

 nient form the chemical composition of twenty-three of the waters of 

 our springs, wells, rivers, and lakes: 



