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
reaction with charcoal and carbonate of soda.

* * * * *

LEAD.

* * * * *

Mineral. Galena

Formula. PbS.

Behavior

(1) in glass-bulb. Generally decrepitates and gives off a small
quantity of sulphur.

(2) in open tube. Gives off SO^{2}, and when strongly heated, a
white sublimate of [.Pb], [.S].

(3) on charcoal. Fuses and is reduced affording a bead of
metallic lead, and forming an incrustation of
PbO on the charcoal. Colors the outer flame
blue.