usion, and gives off brown fumes in
either the oxidation or reduction flame. The deposit upon the charcoal
is of a steel-grey color, with a slightly metallic lustre. The deposit
however that fuses outside of this steel-grey one is of a dull violet
color, shading off to a light brown. Under the flame of oxidation this
deposit is easily driven from one portion of the charcoal to another,
while the application of the reducing flame volatilizes it with the
evolution of a beautiful blue light. The characteristic odor of
decayed horse-radish distinguishes the volatilization of this metal.

TELLURIUM.--This metal fuses with the greatest readiness, and is
reduced to vapor under both flames with fumes, and coats the charcoal
with a deposit of tellurous acid. This deposit is white near the
centre, and is of a dark yellow near the edges. It may be driven from
place to place by the flame of oxidation, while that of reduction
volatilizes it with a green flame. If there be a mixture of selenium
present, then the color of the flame is bluish-green.

ARSENIC.--This metal is volatilized without fusing, and covers the
charcoal both in the oxidizing and reducing flames with a deposit of
arsenious acid. This coating is white in the centre, and grey towards
the edges, and is found some distance from the assay. By the most
gentle application of the flame, it is immediately volatilized, and if
touched for a moment with the reducing flame, it disappears, tinging
the flame pale blue. During volatilization a strong garlic odor is
distinctly perceptible, very characteristic of arsenic, and by which
its presence in any compound may be immediately recognized.

ANTIMONY.--This metal fuses readily, and coats the charcoal under both
flames with antimonious acid. This incrustation is of a white color
where thick, but of a bluish tint where it is thin, and is found
nearer to the assay than that of arsenic. When greatly heated by the
flame of oxidation, it is driven from place to place without coloring
the flame, but when volatilized by the flame of reduction, it tinges
the flame blue. As antimonious acid is not so volatile as arsenious
acid, they may thus be easily distinguished from one another.

When metallic antimony is fused upon charcoal, and the metallic bead
raised to a red heat, if the blast be suspended, the fluid bead
remains for some time at this temperature, giving off opaque white
fumes, which are at first deposited on the surrounding ch