ng flame.

As with borax.

* * * * *

9. Oxide of Cadmium, CdO.

Behavior with Borax on Platinum wire

in the oxidizing flame.

When in very large proportion, dissolves to a clear yellow
glass, which becomes nearly colorless on cooling. When the oxide
is present in any considerable quantity, the glass can be
rendered opaque with an intermittent flame, and, with a larger
addition, it becomes so spontaneously on cooling.

in the reducing flame.

Upon charcoal ebullition takes place and the oxide is reduced.
The metallic cadmium is volatilized and incrusts the charcoal
with its characteristic deep yellow oxide.

Behavior with Mic. Salt on Platinum wire

in the oxidizing flame.

When in very large proportion dissolves to a clear glass, having
a yellow tinge, while hot, which disappears on cooling, and when
perfectly saturated, becomes milk-white.

in the reducing flame.

On charcoal the oxide is slowly and imperfectly reduced. The
reduced metal forms the characteristic incrustation on the
charcoal, but the is thin and does not exhibit its color clearly
until quite cold. The addition of tin hastens the reaction.

* * * * *

10. Oxide of Lead, PbO.

Behavior with Borax on Platinum wire

in the oxidizing flame.

Dissolves readily to a clear yellow glass, which loses its color
upon cooling, and when containing much oxide can be rendered
dull under an intermittent flame. With a still larger addition
of oxide it becomes opaline yellow on cooling.

in the reducing flame.

The plumbiferous glass spreads out on charcoal, becomes turbid,
bubbles up, until the whole of the oxide is reduced, when it
again becomes clear. It is, however, difficult to bring the lead
together into a bead.

Behavior with Mic. Salt on Platinum wire

in the oxidizing flame.

As with borax, but a larger addition of oxide, required to
produce a yellow color in the warm bead.

in the reducing flame.

On charcoal the plumbiferous glass becomes grey and dull. With
an over dose of oxide a part is volatilized and forms an
incrustation on the charcoal beyond the bead. The addition of
tin does not render the glass opaque, but somewhat more dull and
gr