_Lead_.--Galena is a good conductor, and may be directly
electrolyzed. The best bath is a solution of lead nitrate. The
arborescent crystallizations extend rapidly, and must be broken from
time to time to prevent the formation of a metallic connection between
the anode and the cathode. The sulphur of the galena falls to the bottom
of the bath, and may be separated from the gangue by solution in carbon
disulphide.
3. _Copper_.--Native copper sulphide, though a good conductor, cannot
be directly electrolyzed en account of the presence of iron sulphide,
whence iron would be deposited along with the copper. The copper pyrites
are roasted, dissolved in dilute sulphuric acid, and the liquid thus
obtained is submitted to electrolysis.
* * * * *
A PEOPLE WITHOUT CONSUMPTION, AND SOME ACCOUNT OF THEIR COUNTRY--THE
CUMBERLAND TABLELAND.
By E. M. WIGHT, M.D., Chattanooga, Tenn., Late Professor of Diseases
of the Chest and State Medicine, Medical Department University of
Tennessee; Late Member of the Tennessee State Board of Health, and
ex-President of the Tennessee State Medical Society.
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