362 THE CHBMISTEY OF ESSENTIAL OILS
Specific gravity 0*895
Optical rotation ........ + 18-4°
Refractive index 1-4747 at 16°
Yield 0-56 to 2 per cent.
Cineol, pinene, and aromadendrene appear to be the only well-
ascertained constituents, but according to some the oil, when properly
prepared, forms an excellent perfume.
OIL OF EUCALYPTUS MICEOTHECA.This is a common tree in Australia, the characters of its essential
oil being as follows :—
Specific gravity 0-8855
Optical rotation - 27*2°
Refractive index 1-4839 at 20°
Eucalyptol 5 per cent.
Yield 0-23
The oil contains phellandrene, pinene, cymene, eucalyptol, and a
sesquiterpene.
OIL OF EUCALYPTUS MORBISII.This oil has the following characters :—
Specific gravity 0-910 to 0-916
Optical rotation + 3-8° „ + 6'3°
Refractive index 1-4693 at 10°
Yield 1-6 to 1-7 per cent.It contains about 60 per cent, of eucalyptol and some d-pinene.OIL OF EUCALYPTUS MUBLLBBI.
The oil from this tree has the following characters :—
Specific gravity 0-9096
Optical rotation + 10-4°
Refractive index 1-4629 at 24°
Yield 1-28 per cent.
The oil contains 60 per cent, of eucalyptol, pinene, and geranyl
acetate.OIL OF EUCALYPTUS NIGEA.This tree is a Black Stringy Bark of New South Wales. Its oil has
the following values:—
Specific gravity 0-874
Optical rotation - 34-8°
Refractive index 1-4871 at 16°
Yield 0-041 per cent.It contains phellandrene and about 5 per cent, of eucalyptol.OIL OF EUCALYPTUS NOVA ANGELICA.
This tree is a Black Peppermint of New South Wales. Its oil con-
tains pinene, phellandrene, eucalyptol, and aromadendrene. It has the
following characters :—-