OF THE NORTHWEST. 67 
NORTHERN AND SOUTHERN SLOPE OF HILLS. 
by the Lower Magnesian Limestone, and that of the district further south, in Wis- 
consin and Iowa, where the Upper Magnesian Limestone is the surface rock; the 
reason is, both rocks are so nearly alike in chemical composition, that they undergo 
similar changes by atmospheric agencies. There is scenery on the Upper Iowa 
which is almost a fac-simile of views on the Little Makoqueta River in the Dubuque 
District, where the rock is the Upper Magnesian Limestone. Both regions*present 
a combination of rural beauty characteristic of a considerable portion of the Upper 
Mississippi. It is such as fixes itself strongly on the feelings of its inhabitants, and 
tends to endear to them the spot of their nativity. 
The soil derived from the decomposition of the Lower Magnesian Limestone is 
usually of excellent quality; rich, as well in organic matter, as in those mineral 
salts which give rapidity to the growth of plants, and that durability which 
enables it to sustain a long succession of crops. The analysis of a soil,* 
taken from a region of this formation on the Eau Gallée, gave 8-2 per cent. of 
organic matter, 11-2 per cent. of salts, 77-1 per cent. of insoluble silicates, and 0°8 
per cent. of carbonate of lime: this is 7-2 per cent. more salts, and 0°79 per cent. 
more carbonate of lime than the Chippewa soil derived from Formation 1. 
* Analysis of soil taken from the region of F. 2, on the Eau Gallée. 
Water, . : : : ; 2-50 
Organic matter, ; 8-20 
Silicie acid, creat by chlorobydi er , ; 0-04 
Carbonate of lim ; : 0-80 
Meets: . ; ‘ : j 0-32 
Oxide of iron, . : 2-68 
oe discolved by aidonvias a : : 3-04 
Alumina, dissolved by cog acid, . : : : : 1-00 
Alkalies, ; F 0-08 
Phosphates of ies and iron, . ‘ ; 0-01 
Insoluble silicates, j : ; 77°10 
Inorganic acids, solabial with ons leg and los, : : : 4-93 
