660 GEOLOGY AND TOPOGRAPHY OF THE LEAD REGION. 



the lower part (probably about ten feet) was sunk in the Lower Mag- 

 nesian limestone, the rest being in the St. Peters sandstone. 



The following analysis of the water, by Dr. Gustavus Bode, of Mil- 

 waukee, was furnished by Mr. Gomber: 



One gallon U. S. standard measure contains of solid salts, 13.2720 

 grains, consisting of: 



ChLoride of sodium 0.3248 grains. 



Sulphate of soda 0.1792 



Bicarbonate of soda 0.0280 



Bicarbonate of lime : 6.6584 



Bicarbonate of magnesia 4.8552 



Bicarbonate of iron 0.2296 



Alumina 0. 1288 



Silica 0.6888 



Organic matter . 1792 



Total 13.2720 grs. 



Dr. Bode remarks of this well as follows : " The total amount of 

 salts is small in comparison with other waters. The salts themselves 

 are the same as those in the Waukesha water, and in the same com- 

 bination. If the operation of this water depends on the absence of 

 sulphuric acid, and its containing bicarbonates, so the same good and 

 healing results may be expected from your spring." 



Prairie and Forest. The prairie area of the Lead region is com- 

 paratively small, and seems to be chiefly a continuation of the great 

 prairies of Illinois. Tlie most extensive prairie is that found in the 

 southern part of Grant and La Fayette counties, comprising the town- 

 ships of Jamestown, Hazel Green, Benton, ITew Diggings, Shulls- 

 burg, Seymour, Monticeilo and Gratiot. From tliis there is a branch 

 extending in a northwestern direction (corresponding to the eastern 

 subdivision of the watershed previously alluded to), until it unites 

 with the main watershed ; here it branches to the east and west. The 

 western extension forms a prairie in the towns of Glen Haven, Patch 

 Grove, Little Grant, and some parts of Fennimore and Wingville. 

 The eastern prairie follows the main divide already described, the 

 prairie being from six to ten miles in width. 



Between the east and west branches of tlie Pecatonica, there is a 

 prairie, including most of the towns of Fayette, Waldwick and "Wiota. 

 In Green county the principal prairie is found in the towns of Mon- 

 roe, Clarno, Sylvester and Washington. 



This, in substance, is the prairie land of the Lead region, althouo-h 

 there exist small isolated patches of timber, in the area already de- 

 scribed, as well as small prairies, or openings, in the remainder of the 



