BAY, oil of sweet Bay, also termed essential oil of
laurel-berries, is a very fragrant substance, procured by distillation
from the berries of the bay laurel. Though very pleasant, it is not much
used.

BERGAMOT.--This most useful perfume is procured from the
_Citrus Bergamia_, by expression from the peel of the fruit. It has a
soft sweet odor, too well known to need description here. When new and
good it has a greenish-yellow tint, but loses its greenness by age,
especially if kept in imperfectly corked bottles. It then becomes cloudy
from the deposit of resinous matter, produced by the contact of the air,
and acquires a turpentine smell.

It is best preserved in well-stoppered bottles, kept in a cool cellar,
and in the dark; light, especially the direct sunshine, quickly
deteriorates its odor. This observation may be applied, indeed, to all
perfumes, except rose, which is not so spoiled.

When bergamot is mixed with other essential oils it greatly adds to
their richness, and gives a sweetness to spice oils attainable by no
other means, and such compounds are much used in the most highly scented
soaps. Mixed with rectified spirit in the proportions of about four
ounces of bergamot to a gallon, it forms what is called "extract of
bergamot," and in this state is used for the handkerchief. Though well
covered with extract of orris and other matters, it is the leading
ingredient in Bayley and Blew's Ess. Bouquet (see BOUQUETS).

[Illustration: Styrax Benzoin.]

BENZOIN, also called Benjamin.--This is a very useful substance