ses with ebullition to a brown globule forming
an incrustation of [...Bi=] on the charcoal.

(4) in forceps. I. Fuses with ease to a yellow bead, coloring
the outer flame bluish green, especially if
moistened with HCl. This color is due to
[.....P].

(5) in borax. Gives the bismuth and also an iron reaction.

(6) in mic. salt. As in borax, but leaves a silicious skeleton.

(7) with carb. soda. Fuses to a yellow mass. The bismuth is then
reduced to the metallic state and partially
volatilized, incrusting the charcoal beyond.

(8) Special reactions. --

* * * * *

Mineral. Tetradymite

Formula. Bi, Te, S.

Behavior

(1) in glass-bulb. Occasionally decrepitates and then fuses,
forming a greyish white sublimate immediately
above the mineral fragment.

(2) in open tube. Fuses and gives off white fumes, part of which
pass up the tube and part deposit immediately
above the mineral. This latter if heated fuses
to clear drops (TeO^{3}). The mineral residue
becomes surrounded by fused [...Bi=],
characterized by its yellow color.

(3) on charcoal. Fuses to a metallic bead, colors the outer flame
bluish green (Te and Se) and incrusts the
charcoal around with the orange [...Bi=], beyond
which is a white incrustation partly consisting
of [...Te].

(4) in forceps. --

(5) in borax. The yellow oxide obtained upon charcoal gives
the bismuth reaction, and the white incrustation
of bismuth and telluric acid.

(6) in mic. salt. As in borax.

(7) with carb. soda. In the reducing flame yields a bead of metallic
bismuth, part of which is part of the tellurium
volatilized and incrusts the charcoal around.

(8) Special reactions. The fused alkaline mass gives the sulphur
reaction on silver. Also gives the tellurium