refractive index at 20 deg. C., 1.5013-1.5030. The principal constituents
are cedrene and cedrol.

_Cinnamon oil_, distilled from the bark of Cinnamomum zeylanicum.
Specific gravity at 15 deg. C., 1.00-1.035; optical rotation, laevo-rotatory
up to -2 deg.; usually soluble in 2 to 3 volumes of 70 per cent. alcohol,
but sometimes requires 1 volume of 80 per cent. alcohol for solution;
aldehydes, by absorption with sodium bisulphite solution, 55-75 per
cent.; and phenols, as measured by absorption with 5 per cent. potash,
not exceeding 12 per cent.

The value of this oil is not determined entirely by its aldehyde content
as is the case with cassia oil, and any oil containing more than 75 per
cent. aldehydes must be regarded with suspicion, being probably admixed
with either cassia oil or artificial cinnamic aldehyde. The addition of
cinnamon leaf oil which has a specific gravity at 15 deg. C. of 1.044-1.065
is detected by causing a material rise in the proportion of phenols.
Besides cinnamic aldehyde the oil contains eugenol and phellandrene.

_Citronella Oil._--This oil is distilled from two distinct Andropogon
grasses, the Lana Batu and the Maha pangiri, the former being the source
of the bulk of Ceylon oil, and the latter being cultivated in the
Straits Settlements and Java. The oils from these three localities show
well-defined chemical differences.

_Ceylon Citronella oil_ has the specific gravity at 15 deg. C., 0.900-0.920;
optical rotation, laevo-rotatory up to -12 deg.; refractive index at 20 deg. C.,
1.480-1.484; soluble in 1 volume of 80 per cent. alcohol; total
acetylisable constituents, calculated as geraniol, 54-70 per cent.

_Singapore Citronella Oil._--Specific gravity at 15 deg. C., 0.890-0.899;
optical rotation, usually slightly laevo-rotatory up to -3 deg.; refractive
index at 20 deg. C., 1.467-1.471; soluble in 1 to 1.5 volumes of 80 per
cent. alcohol; total acetylisable constituents, calculated as geraniol,
80-90 per cent.

_Java Citronella Oil._--Specific gravity at 15 deg. C., 0.890-0.901; optical
rotation, -1 deg. to -6 deg.; total acetylisable constituents, calculated as
geraniol, 75-90 per cent.; soluble in 1-2 volumes of 80 per cent.
alcohol.

The chief constituents of the oil are geraniol, citronellal, linalol,
borneol, methyl eugenol, camphene, limonene, and dipentene. It is very
largely used for perfuming cheap soaps, and also serves as a source for
the production of geraniol.

_Bois