Eii it i, rial Comment. Ill 
rocks, accompanied by a manuscript descriptive list, and a 
general account of the various ore basins represented in Mar- 
quette county. It seemed a great mistake that this was not 
put into print for the use of visitors, as it was a key to the 
whole exhibit. From the copper mines there was a large dis- 
play. The largest mass of native copper on exhibit was from 
the Central mine. Keweenaw county, and weighed 8,500 lbs. 
Another had a weight of (5,200 lbs. Two samples of hematite, 
from the Republic mine, together weighed 10,375 lbs. and 
were accompanied by the following analysis, showing their 
average composition : 
Metallic iron 68.050 
Silica 1.150 
Phosphorus 040 
Alumina 'His 
Magnesia 072 
Lime 12 ; 
Manganese 022 
Sulphur 036 
Organic and volatile --''mi 
There was also an admirably constructed section of the 
Cleveland Cliffs Iron Company's Lake mine, Ishpeming, made 
in the actual material, showing three levels, and another of 
the Cliffs Shaft mine. These exhibited the general relations 
of the ore to the depth of 50(1 feet, and a horizontal width of 
750 feet. Their dimensions were 12 feet high and is feet by 
18 feet horizontal. Another section illustrated the formation 
east and west of the Calumet lode, exhibited by the Calumet 
and Hecla Company. There was also a fine display of verd 
antique and serpentine marble from the region west of Ishpe- 
ming. 
Wisconsin exhibited, besides granites and various kinds of 
building materials, the iron ores of the Penokee range. A 
large piece of metallic ( float I copper was exhibited, found in 
Jefferson county, having a weight of l.soo lbs. The most 
striking object in the Wisconsin exhibit were the four mono- 
liths of lake Superior red sandstone standing at the four cor- 
ners of the pavilion. 
Minnesota had an exhibit of the iron ores of the state, and 
a -erics of rock samples from the crystalline rocks, prepared 
by the state survey. There was also a model of the great 
