is probable that these oils might be used with great advantage in
the manufacture of varnish, they readily dissolve copal, and when its
solution is spread over any surface the oil soon evaporates, and
leaves a hard, brilliant and uniform coating of the resin. These oils,
according to Prof. Solly, are specially worthy of attention.

Dr. Bennett, in his "Wanderings in New South Wales," states that a
large quantity of camphorated oil, which closely resembles the
cajeputi, is produced from the foliage of several species of
_Eucalyptus_. Some of the leaves, which are of a bluish green, contain
it in such abundance as to cover the hand with oil when one of the
leaves is gently rubbed against it.

From the odorous leaves of the _Arbor alba_ is extracted a portion of
the aromatic cajeput oil. This celebrated medicinal oil is principally
made in the island of Borneo, one of the Moluccas.

The leaf of the _Melaleuca minor_ yields, by distillation, the
volatile oil of cajeputi, well known as a powerful sudorific, and a
useful external application in chronic rheumatism. It is an evergreen
shrub, with white flowers like a myrtle, native of the East Indies,
principally flourishing on the sea coasts of the Moluccas and other
Indian islands. Two sacks full of the leaves yield scarcely three
drachms of the oil, which is limpid, pellucid, and of a green color.

Oil of cinnamon and oil of cassia, according to Mulder, have the same
composition. When fresh they are pale yellow, but become brown on
exposure to the air. On exposure they rapidly absorb cinnamic acid,
two resins and water.

More than 22,000 lbs. of essence of bergamot was imported in 1848. It
is obtained by distillation or pressure from the rind of the fragrant
citron.

_Andropogon calamus aromaticus_, of Royle, _A. nardoides_, of Nees v.
Esenb., according to some yields the grass oil of Namur.

The fruits of _Carum carui_, a hardy biennial British plant, popularly
known as caraway seeds, supply a volatile oil, which is carminitive
and aromatic. Oils of a similar kind are obtained from _Coriandrum
sativum_, from anise (_Pimpinella Anisum_), and cumin (_Cuminum
Cyminum_), a native of Egypt.

The production of cinnamon, clove, and cassia oils, have already been
noticed in speaking of those spices.

In Malabar, a greenish sweet-smelling oil is obtained, by
distillation, from the roots of _Unona Narum_, an evergreen climber,
which is used medicinally as a Stimulant.

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