No. 50.] 
263 
sea water than the harder kinds of iron, and hence there arose another 
objection to the cables made from the Arnold ore. 
It is evident too, that for horse shoes and other purposes where it is 
exposed to wear, it is not so valuable ; this objection is obviated, how- 
ever, by mixing harder ores with it, by which there is formed an iron 
possessing both hardness and tenacity. 
3. Other veins of the Arnold HilL 
Lying side by side with the blue vein is a gray and black vein. They 
are separated by only a few feet of rock, and though they are distin- 
guished by distinct names, yet there is in fact but httle difference in the 
appearance of the ore. Each vein furnishes much that is blue and 
similar in appearance to the blue vein. Taking, however, either vein 
as a whole, there is sufficient difference in the eyes of a miner, for the 
distinctions already referred to. The quality of the ore too, is similar 
to the blue vein, being soft, granular and easily wrought. They fur- 
nish iron also of the same general qualities. If any difference exists, it 
is in hardness, which however, is only slightly increased. The same 
facts too, exist in relation to dip, direction and depth to which they have 
been worked. The width of the black vein is from 3 to 11 feet wide, 
and the gray is from 2 to 8 feet. In pursuing these veins downwards 
there is no decrease in width. At the surface they pursue parallel 
courses, but it is possible that they may constitute but one vein in the 
interior of the earth. 
The three veins are crossed and cut through by a green stone dyke, 
which is about 10 feet wide. In its passage across them it produces 
no change in the direction of the blue and gray veins, but the north side 
of the black vein is moved four feet towards the east. 
Another vein which was early discovered on the Arnold hill, is one 
which is called the Indian vein. It appears some fifty rods to the west 
of the veins just described, and passes in a direction oblique to the oth- 
ers, so that it intersects them some distance north of the present work- 
ings of the blue and black veins. 
It is a harder ore and has not been wrought to sufficient extent to 
determine its real value. The iron however which was made from it 
is said to have been excellent, though it worked harder than the neigh- 
boring ores, on which account it has not been explored. This vein 
furnishes an additional reason for the opinion which has been expressed 
