324 On the corrosion of Copper and Silver in Sea-water. 
nament, as near one of the ends is # circular crease or groove, for 
tying a thread: it is round, two inches and a half in length, one inch 
in diameter at the centre, and half an inch at each end. Jt is com- 
posed of small pieces of native copper pounded together; and in the 
cracks between the pieces are stuck several pieces of silver, one nearly 
the size of a half-dime. A piece of red ochre or paint, and a piece of 
iron ore [hematite] which had the appearance of having been partially 
vitrified [polished ?], were also found 
E “oT 
fire and smoke. ‘This circle of stones seems to have been the nucleus 
over which the mound was formed, as immediately over them is heaped 
the common earth of the adjacent plain. At the time of i 
the height was six feet, the diameter_between thirty and forty. It has 
every appearance of being as old as any in the neighborhood, and was, 
at the settlement of Marietta, covered with large trees. It seems to 
ave been made for this single personage, as the remains of one skele- 
ton only were discovered. -'The bones were much decayed, and many 
of them crumbled to dust on exposure to the air.” js 
must, at the same time, be admitted that they possessed the difil- 
cult art of plating one metal upon another. ‘There is but one 
alternative, viz., that they had occasional or constant intercourse 
with a people adyanced in the arts, from whom these articl 
were obtained. 
¥ 
Art. XXX1V.—On the corrosion of an Alloy, composed of Cop- 
per and Silver, in Sea-water ; by Ave. A. Hayes, Assayer to 
the State of Massachusetts. 
- Some analyses I made many years since of sheathing coppers 
“which had long resisted the action of sea-water, proved the pres- 
~ ence of nearly one ten-thonsaudth part of silver.” It was found 
that even this small portjon of silver, sensibly modified the chem- - 
ical relations of the metal, and observations had indica ba 
the quality for sheathing, was improved. 
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