Chemistry of Essential Oils

MYBTACE^E 356

OIL OF EUCALYPTUS CBBBEA.

This tree is the narrow-leaved iron bark of several of the Australasian

Colonies, and is found in India. The oil has the following char-

acters :—

Specific gravity 0-8986

Optical rotation - 3° to - 10*9°

Refractive index 1-4670 to 1-4844 at 16°

It contains phellandrene, eucalyptol, and aromadendrene.

OIL OP EUCALYPTUS DAWSONII.

This tree is the New South Wales Staley gum, and its oil contains

aromadendrene as its principal constituent. It has the following char-

acters :—

Specific gravity 0*9418

Refractive index 1'5144 at 16°

Saponification value 13-3

Yield 0-172 per cent.

It contains phellandrene and eucalyptol, as well as aromadendrene.

OIL OF EUCALYPTUS DEALBATA

This tree is found in New South Wales and Queensland. The oil

has the following characters :—

Specific gravity 0-9261

Optical rotation + 3-7°

Refractive index 1*4705 at 16°

Yield 0-86 per cent.

It contains eucalyptol, pinene, and aromadendrene.

OIL OF EUCALYPTUS DELEGATENSIS.

This tree is the gum-topped stringy bark of Tasmania, New South

Wales, and Victoria. The oil has the following characters :—

Specific gravity 0-8664

Optical rotation - 48-4°

Refractive index 1-4828 at 24°

Yield 1*3 to 1*9 per cent.

It contains phellandrene, piperitone, and a sesquiterpene.

OIL OF EUCALYPTUS DEXTROPINEA.

This tree is one of the stringy barks of New South Wales. The oil

has the following characters :—

Specific gravity 0-874 to 0*883

Optical rotation + 24-2°

Refractive index 1-4688 at 21°

Saponification value ....... 22*1

Yield 0'83 per cent.

The oil contains a considerable amount of d-a-pinene, a small amount
of eucalyptol, and a little geranyl acetate.