ic
mercury, which volatilizes and recondenses
in the upper part of the tube, and SO^{2},
which passes off as is easily recognized by
its odor and bleaching properties.

(3) on charcoal. Is volatilized, generally leaving a small
earthy residue.

(4) in forceps. --

(5) in borax. --

(6) in mic. salt. --

(7) with carb. soda. With carbonate of soda and cyanide of
potassium is decomposed and metallic mercury
volatilized.

(8) Special reactions. When in the preceding experiment the mercury
has been entirely dissipated, the alkaline
residue laid on silver gives a sulphur
reaction.

* * * * *

Mineral. Native amalgam

Formula. AgHg^{2}.

Behavior

(1) in glass-bulb. As native mercury, but leaves a residue of
pure silver.

(2) in open tube. --

(3) on charcoal. The mercury volatilizes leaving the silver,
which fuses to a bead, and, in the oxidizing
flame, incrusts the charcoal with its
characteristic oxide.

(4) in forceps. --

(5) in borax. --

(6) in mic. salt. --

(7) with carb. soda. --

(8) Special reactions. --

* * * * *

SILVER.

* * * * *

Mineral. Native silver

Formula. Ag.

Behavior

(1) in glass-bulb. --

(2) in open tube. --

(3) on charcoal. Fuses and in a strong oxidizing flame forms
an incrustation of dark brown oxide on the
charcoal. If any antimony be present, it
affords a crimson incrustation.

(4) in forceps. --

(5) in borax. Gives the silver reactions.

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

(7) with carb. soda. --

(8) Special reactions. --

* * * * *

Mineral. Antimonial silver

Formula. Ag^{2}Sb.

Behavior

(1) in glass-bulb. --

(2) in open tube.