(2) in open tube. —­

  (3) on charcoal.  As the red oxide.  Sometimes also gives a lead
                         incrustation.

  (4) in forceps.  V.

  (5) in borax.  Gives a zinc reaction and frequently an iron and
                         manganese reaction.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda.  Forms a thick incrustation of zinc, sometimes
                         also of [.Pb] and [.Co].

  (8) Special reactions.  Dissolves with much effervescence in cold acid.

* * * * *

BISMUTH.

* * * * *

Mineral.  Native bismuth

Formula.  Bi.

Behavior

  (1) in glass-bulb. —­

  (2) in open tube.  Fuses and is converted into a yellow oxide.

  (3) on charcoal.  Fuses to a bead and incrusts the charcoal with
                         oxide.

  (4) in forceps. —­

  (5) in borax.  The oxide formed upon charcoal gives the bismuth
                         reactions.

  (6) in mic. salt.  As in borax.

  (7) with carb. soda. —­

  (8) Special reactions. —­

* * * * *

Mineral.  Bismuthine

Formula.  BiS.

Behavior

  (1) in glass-bulb. —­

  (2) in open tube.  Fuses with ebullition and gives of S and SO^{2}.

  (3) on charcoal.  Fuses with much spirting and in the reducing
                         flame yields a metallic bead and incrusts the
                         charcoal with oxide.

  (4) in forceps. —­

  (5) in borax.  The oxide obtained upon charcoal gives the
                         bismuth reactions.

  (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.  Bismuthblende

Formula. [...Bi=]^{2}[...Si]^{3}.

Behavior

  (1) in glass-bulb.  Turns yellow and, when strongly heated, fuses.

  (2) in open tube. —­

  (3) on charcoal.  Fuses 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].