small piece of the oxide of tellurium placed upon charcoal, a bright
green color is produced. Or if telluric acid be submitted to the
reduction flame upon the loop of a platinum wire, it communicates to
the outer flame the bright green of tellurium. If the sublimate found
upon the charcoal in the first experiment be submitted to the blowpipe
flame, the green color of tellurium is produced while the sublimate is
volatilized. If selenium be present the green color is changed to a
deep blue one.


D. YELLOW.

The salts of soda all give a bright yellow color when heated in the
platinum loop in the reduction flame. This color is very persistent,
and will destroy the color of almost any other substance. Every
mineral of which soda is a constituent, give this bright orange-yellow
reaction. Even the silicate of soda itself imparts to the flame of
oxidation the characteristic yellow of soda.


E. RED.

(_a._) _Strontia._--Moisten a small piece of the chloride of
strontium, put it in the platinum forceps and submit it to the flame
of reduction, when the outer flame will become colored of an intense
red. If the salt of strontia should be a soluble one, the reaction is
of a deeper color than if an insoluble salt is used, while the color
is of a deeper crimson if the salt is moistened. If the salt be a
soluble one, it should be moistened and dipped into the flame, while
if it be an insoluble salt, it should be kept dry and exposed beyond