On the mutations of Geological nomenclature. 261 
Manganese—the compact ore, at the ore bed, and in the 
north part of the town. , . 
Titanium—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. 
Breccia—common, cement ferruginous, fragments prin- 
cipally quartz. 
Puddingstone—in considerable masses, with a calcareous 
cement, near running water. 
For the Journal of Science. 
‘To Pror. SinLImANn. 
Art X1.—Ought American Geologists to adopt the changes 
im the Science, proposed by Phillips and Conybeare? See 
Review, Vol. VII. pp. 203 to 240. 
_ Tuts treatise has received much public approbation in 
England and a degree of homage in America. ‘The talents 
and industry of the authors, certainly deserve such a tri- 
bute. But a question, very different from any which res- 
pects the intrinsic merit of the work naturally presents 
itself. Shall American geologists follow the new method 
introduced by its authors in generalizing our rocks and 
alluvial deposits ? I am desirous, that those who control 
public opinion by the authority of a great and well-earned 
reputation, should pause a moment before they compel us, 
who have as much zeal in the cause as they, but no author- 
ity, to submit to these very unexpected changes. 
These authors propose, that we should begin at the upper 
surface of the earth and proceed downwards, when we study 
its structure. To one who never gave any attention to the 
subject, it would appear very reasonable, 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 their 
true characters much more concealed and obscure, than 
