There are several metals which will sublime, and may be examined in
the cold portion of the tube. _Mercury_ condenses upon the tube in
minute globules. These often do not present the metallic appearance
until they are disturbed with a glass rod, when they attract each
other, and adhere as small globules. Place in the tube about a grain
of red precipitate of the drug stores and apply heat, when the oxide
will become decomposed, its oxygen will escape while the vaporized
mercury will condense upon the cold portion of the tube, and may there
be examined with a magnifying glass.

_Arsenic_, when vaporized, may be known by its peculiar alliaceous
odor. Arsenic is vaporized from its metallic state, and likewise from
its alloys. Several compounds which contain arsenic will also sublime,
such as the arsenical cobalt. Place in the bulb a small piece of
arsenical cobalt or "fly-stone," and apply heat. The sulphide of
arsenic will first rise, but soon the arsenic will adhere to the sides
of the tube.

The metals tellurium and cadmium are susceptible of solution, but the
heat required is a high one. This is best done upon charcoal.

The _perchloride of mercury_ sublimes undecomposed in the bulb,
previously undergoing fusion.

The _protochloride of mercury_ likewise sublimes, but it does not
undergo fusion first, as is the case with the corrosive sublimate.

The _ammoniacal salts_ all are susceptible of sublimation, which they
do without leaving a residue. There are, however, several which
contain fixed acids, which latter are left in the bulb. This is