bottles are inverted; as, if by any chance the ammonia runs out and is
spilt over certain colored fabrics, it causes a stain. When such an
accident happens, the person who sold it is invariably blamed.

When the sponge is saturated properly, it will retain the ammoniacal
odor longer than any other material; hence, we presume, bottles filled
in this way are called "inexhaustible," which name, however, they do not
sustain more than two or three months with any credit; the warm hand
soon dissipates the ammonia under any circumstances, and they require to
be refilled.

For transparent colored bottles, instead of sponge, the perfumers use
what they call insoluble crystal salts (sulphate of potass). The bottles
being filled with crystals, are covered either with the liquid ammonia,
scented as above, or with alcoholic ammonia. The necks of the bottles
are filled with a piece of white cotton; otherwise, when inverted, from
the non-absorbent quality of the crystals, the ammonia runs out, and
causes complaints to be made. The crystals are prettier in colored
bottles than the sponge; but in plain bottles the sponge appears quite
as handsome, and, as before observed, it holds the ammonia better than
any other material. Perfumers sell also what is called WHITE
SMELLING SALTS, and PRESTON SALTS. The White Smelling Salt
is the sesqui-carbonate of ammonia in powder, with which is mixed any
perfuming otto that is thought fit,--lavender otto giving, as a general
rule, the most satisfaction.

PRESTON SALTS, which is the cheapest of all the ammoniacal
compounds, is composed of some easily decomposable salt of ammonia and
lime, such as equal parts of muriate of ammonia, or of sesqui-carbonate
of ammonia, and of fresh-slaked lime. When the bottles are filled with