410 On Sulphurets of Copper from the Canton (Ga.) Mine. 
the first traces of copper are found in the form of ‘black oxyd,’ 
‘which evidently contains the sulphuret; and at 96 feet this 
sulphuret with red oxyd and malachite has materially increased 
in quantity. These with the abundant existence of the hy- 
drous protoxyd of iron indicate the very general action of oxy- 
gen and carbonic acid at this level. The first traces of galena 
are here found in the tunnel contiguous to the chloritic slate 
of the north wall; this, as will be seen below, seems to a 
normal position of this mineral in the vein. Native copper m 
small sprigs is also found «attached to the very quartzose veln- 
ne. 
At 116 feet, near the shaft, all signs of decomposition disappear. 
The siliceous mica. slate, containing segregated masses of pure 
these, filling the interspaces of the erystals of pyrites and appat- 
vase 
ystallized 
point the decomposition has extended to greater depths than 
elsewhere. As the tunnel passes on, the roof presents a series 
of reddish-brown and white “flucanny” layers, evidently the 
decomposed continuations of the alternations above mentioned, 
which with these successive repetitions, taken in connection wll 
the water, which with its salts of copper and iron in solution, 18 
known to have trickled through them, suggei 
ge voltaic pile, the galvano-chemical action 
huge 
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