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y 
makes iron fast, and considering all its properties, it must be considered 
one of the most valuable veins in the county of Clinton. 
8. Quantity. 
In estimating the quantity of ore which the Cook vein may yield, it 
is proper to take into the account the four parallel veins. It will be seen 
that their aggregate width is twenty-four feet. Those several veins are 
so near each other that by transverse cuttings, all of them may be worked 
as one vein. The examination of the vein proved also the increase of 
ore downwards, an increase produced in part by an increase of the 
width of the vein, and also by the disappearance of the stony matter 
in the vein. The arrangement of the ore and earthy matter is mostly 
in vertical parallel bands or stripes. It is evident in many instances 
that there is a larger amount of rock in the vein near the surface. This 
was evidently the case with the Cook vein, though it would not be an 
uncommon circumstance if the predominance of earthy matter should 
be found restored deeper in the vein. Still the indications were favo- 
rable to an increase of ore, rather than a diminution of it. 
The Cook vein maybe traced in a northerly direction by the masses 
of ore at the surface of the rock, for one and a half miles. At its ex- 
treme northerly boundary it appears again in heavy masses, and has 
there been opened by Mr. Stone, and is now successfully and profita- 
bly worked. The ore of this vein is highly magnetic and possesses 
distinctly, polarity. This is a property, however, which is more fre- 
quently possessed by that portion of the vein -above the surface of the 
rock, or that portion which has been exposed to light. It often happens 
that ore v/hicli is raised from a depth of 25 or 30 feet, exhibits at first 
neither polarity nor magnetism, but after exposure to light and atmos- 
pheric agents, this property is strongly developed, indicating it would 
seem, some connexion with imponderables, as light, caloric and electri- 
city at the surface, which does not exist far beneath it. 
From what has been said, it will be seen that the quantity of ore 
which the Cook vein is capable of furnishing, is all that can be wished. 
Its breadth and prolongjation northwards show conclusively that for a 
long time it will be accessible without deep excavation. 
This consideration I have thought proper to introduce, inasmuch as 
it bears on the permanence and stability of the manufacture of iron, 
and the expediency of permanent improvements. If the veins of ore 
