= 
Manganese—the compact ore, at the ore bed, and in the 
north part of the town. Se Sgbiaise!’ 
_ Titanitum—very abundant in small hexagonal crystals in 
the mica-slate forming the walls of the ore bed—species 
red oxide. Also in large prisms in quartz and augite. 
Breceta—common, cement ferruginous, fragments prin- 
cipally quartz. : 
- Be Fi 
oe | i} 
o 
cement, near running water. 
For the Journal of Science. 
To Pror. Sinniman. 
Ant XI.—Ought American Geologists to adopt the changes 
in the Science, proposed by Phillips and Conybeare? See 
Review, Vol. VII. pp. 203 to 240. 
) mexpected changes. 
4+hese authors propose, that we should begin at the upper 
surface of the earth and proceed downwards, when we study 
its structure. T'o one who ne gave any attention to the 
subject, it would appear very onable, that we should 
Commence with the surface which is visible, and proceed 
from this known and visible part towards the hidden parts 
beneath. But every experienced geologist knows, that the 
subjects of the superior order of these authors have t 
"ue characters much more concealed and obscure, t 
On. the mutations of Geological nomenclature. 261 
masses, with a calcareous 
& 
Phy 
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tad 
