Chemistry of Essential Oils

MYETACE^E 359

OIL OF EUCALYPTUS H^EMASTOMA.
This tree is the Scribbly gum of most of the colonies. Its oil con-
tains much phellandrene, eucalyptol, and aromadendrene, and has the
following characters:—
Specific gravity 0*9195
Refractive index 1-5013 at 16°
Yield 0-28 per cent.

OIL OF EUCALYPTUS HEMILAMPRA.
This tree is found in New South Wales. The oil has the following
values:—

Specific gravity 0-928

Optical rotation........ +6'9°

Refractive index 1 -4735 at 16°

Yield 0-38 per cent.

It contains eucalyptol, pinene, aromadendrene, and an aldehyde.

OIL OF EUCALYPTUS HEMIPHLOIA.

This tree is found in South Australia. The oil contains eucalyptol,

pinene, and aromadendral. Its characters are as follows:—

Specific gravity 0 9117

Optical rotation - 6-8°

Refractive index 1-4854 at 20°

Eucalyptol 20 per cent.

Yield 0-55 „

OIL OF EUCALYPTUS INTEBTEXTA.

This tree is known in New South Wales as the Candle Bark. Its

oil has the following characters :—

Specific gravity 0'9076

Optical rotation +10'2°

Refractive index 1-4748 at 16°

Yield 0-2 to 0-64 per cent.

It contains eucalyptol, rf-pinene, and aromadendrene.

OIL OF EUCALYPTUS LACTEA.

This tree is known in New South Wales as " Spotted Gum ". The

oil contains pinene and eucalyptol, and has the following characters :—

Specific gravity 0'875 to 0-883

Optical rotation - 0'6° „ - 1-2°

Refractive index 1-4898 at 16°

OIL OF EUCALYPTUS L^VOPINEA.

The oil from this " Silver-top Stringy Bark" has the following

characters:—

Specific gravity 0'875 to 0'888

Optical rotation - 30'7° „ - 33'3°

Refractive index. • 1'4697 at 19°

Yield 0-66 per cent.

The oil contains much laevo-pinene and about 5 per cent, of eu-

calyptol.