baryta falls, and the permanganic acid remains dissolved in the water.
Permanganate of potash, which crystallizes in reddish purple prisms, is
the most important of its salts. It is largely employed in analytical
chemistry, and is the basis of Condy's Disinfectant Fluid.

Manganese is a constituent of many mineral waters, and is found in small
quantities in the ash of most vegetables and animal substances. It is
always associated with iron.

Various preparations of manganese have been employed in medicine. The
sulphate of the protoxide in doses of one or two drachms produces
purgative effects, and is supposed to increase the excretion of bile;
and in small doses, both this salt and the carbonate have been given
with the intention of improving the condition of the blood in cases of
anaemia. Manganic acid and permanganate of potash are of great use when
applied in lotions (as in Condy's Fluid diluted) to foul and fetid
ulcers. In connection with the medicinal applications of manganese it
may be mentioned that manganic acid is the agent employed in Dr. Angus
Smith's celebrated test for the impurity of the air.

It is the glass maker's soap of glass manufacture, and is used to
correct the green color of glass, which is owing to the presence of
protoxide of iron. This it converts into the comparatively colorless
peroxide.

It is also used in the Bessemer and similar processes, to decompose the
oxide of iron. Spiegeleisen, an iron which contains a natural alloy of
from 10 to 12 per cent. of manganese, is used for this purpose when
conveniently attainable.--_Glassware Reporter_.