34 
STATE AGRICULTURAL SOCIETY. 
Magnesian, at the quarries near Ripon, Markesan and Han- 
chetville, and at Way's Landing, on the Mississippi; at the 
base of the Trenton, Limestone at Mineral Point, Beloit, Janes¬ 
ville and Ripon; at the base of the Niagara and Clinton 
Group, “ along the bold escarpments which it presents from 
Horicon northward." He also mentions some argillo-calcare- 
ous beds of the Potsdam Sandstone, one of which is largely 
developed at Trempealeau, on the Mississippi. 
Several specimens of this water lime found in some of these 
localities, were forwarded by Prof. Daniels to A. A. Hayes, 
Assayer to the State of Massachusetts, for examination, with 
the following results: 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
Carbonate of Lime,. 
.67.12 
58.04 
65.40 
56.14 
Carbonate of Magnesia,. 
. 8.68 
12.76 
20.80 
7.62 
Silicate of Iron and Alumina,. 
Silicate of Alumina,. 
..21.06 
24.40 
5.20 
32.43 
Oxide of Iron and Alumina,.... 
2.27 
Water,. 
. 1.60 
.70 
1.20 
1.28 
Loss,. 
.10 
o 
CO 
.20 
.26 
100.00 
100.00 
100.00 
100.00 
No. 1, was taken from the upper beds of Lower Magnesian, near Ripon. 
No. 2, from lower layers of Trenton, at Miltimore’s Quarry, Janesville. 
No. 3, from the base of the Niagara and Clinton, just east of Horicon. 
No. 4, from the Potsdam Sandstone, at Trempeleau. 
From these analyses, Mr. Hayes concludes that the specimens 
examined by him are proper hydraulic limestones, and that 
mixtures of them could be made which would possess the hy¬ 
draulic property (the property of hardening under water) in a 
high degree. 
Water lime possesses great economic value, and inasmuch as 
great damage and pecuniary loss result from the importation 
and use of that which, either never was good, or has lost its 
hydraulic power from long exposure to the air, it is important 
that the people of our State acquaint themselves with the places 
where the best hydraulic limestones may be found, and that 
* 
measures be adopted to favor the manufacture of this cement. 
Marl .—This is a term of rather uncertain significance, being 
frequently applied by agricultural writers to mere alluvial clays 
