CHAPTER I. 
METALS AND THEIR ORES. 
Eas geology is an account of rocks with reference to their 
pecuniary value, or immediate application to the wants of society. 
A full treatise would include a description of the methods of mining, 
quarrying, and metallurgy; chemical processes for the manufacture of 
various salts; account of the manufacture of quicklime, glass, and earthen- 
ware; the discussion of the nature and origin of metalliferous deposits ; 
the uses of peat in agriculture, etc. Our work will be mainly the de- 
scription of the localities, modes of occurrence, and quantity of materials 
valuable for economic purposes. Very few of the industries involved 
in the manufacture of mineral materials have become thoroughly estab- 
lished in New Hampshire, so that our contributions to the perfection of 
the processes employed cannot be extensive. Allusion will be made 
from time to time to methods of manufacture or processes of reduction, 
so far as seems desirable. For convenience, this part will be divided into 
three chapters,—first, that relating to the occurrence and extraction of 
the metals; second, facts about the supplies of mineral materials used 
for building and the manufacture of useful articles; third, an account of 
deposits serviceable to the interests of agriculture. A part of this topic 
has been already discussed in the chapter upon Agricultural Geology in 
Volume I. 
The following metals occur in considerable abundance in the state 
(insomuch that the question will be raised with each, whether its ores 
