brown, and when in large quantity, perfectly opaque. In a
strong flame, oxide of molybdenum is formed which is visible in
the yellow glass in the form of black flakes. If the glass
appear opaque, it should be flattened with the forceps.

Behavior with Mic. Salt on Platinum wire

in the oxidizing flame.

Dissolves to a clear glass, which, when sufficient acid is
present, is of a yellowish-green color when warm, and becomes
nearly colorless on cooling. On charcoal, the glass becomes
dark, and when cool has a beautiful green color.

in the reducing flame.

The glass becomes of a bottle-green color, which on cooling,
changes to a brilliant green, similar to that produced by oxide
of chromium. The reaction on charcoal is precisely similar. Tin
renders the color somewhat darker.

* * * * *

31. Vanadic Acid, VaO^{8}.

Behavior with Borax on Platinum wire

in the oxidizing flame.

Dissolves to a clear glass, which is colorless when only a small