some sulphur, sulphide of
antimony and antimony which condense in the neck
of the bulb.

(2) in open tube. Fuses and emits dense white fumes of SbO^{3},
which pass off and redden blue litmus paper.

(3) on charcoal. Fuses with great ease evolving much SbO^{3} and
PbO, which incrusts the charcoal around the
mineral. When the fumes have ceased, a small
bead of metallic lead remains.

(4) in forceps. --

(5) in borax. The yellow incrustation formed upon charcoal
gives the reaction of lead, and the white those
of antimony.

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

(7) with carb. soda. As alone on charcoal. The fused alkali gives the
sulphur reaction on silver.

(8) Special reactions. --

* * * * *

Mineral. Minium

Formula. Pb^{3}O^{4}.

Behavior

(1) in glass-bulb. --

(2) in open tube. --

(3) on charcoal. Is reduced first to litharge (PbO) and then to
metallic lead which forms the usual
incrustation.

(4) in forceps. Colors the outer flame blue.

(5) in borax. Gives the lead reactions.

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

(7) with carb. soda. As alone on charcoal.

(8) Special reactions. --

* * * * *

Mineral. Mendipite

Formula. PbCl + 2PbO.

Behavior

(1) in glass-bulb. Decrepitates slightly and assumes a yellow
color.

(2) in open tube. --

(3) on charcoal. Fuses readily and is reduced to metallic lead
with the evolution of acid fumes. Forms a white
incrustation of PbCl, and a yellow one of PbO.

(4) in forceps. As the preceding.

(5) in borax. As the preceding.

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

(7) with carb. soda. As alone on charcoal.

(8) Special reactions. Gives the chlorine reaction with CuO and
microcosmic salt.

* * * * *

Mineral. Cerusite

Formula. [.Pb][..C].

Behavi