_Cassia oil_, distilled from the leaves of Cinnamomum cassia, and shipped to this country from China in lead receptacles. Specific gravity at 15 deg. C., 1.060-1.068; optical rotation, slightly dextro-rotatory up to +3 deg. 30'; refractive index at 20 deg. C., 1.6014-1.6048; soluble in 3 volumes of 70 per cent. alcohol as a general rule, but occasionally requires 1 to 2 volumes of 80 per cent. alcohol. The value of the oil depends upon its aldehyde content, the chief constituent being cinnamic aldehyde. This is determined by absorption with a hot saturated solution of sodium bisulphite. Three grades are usually offered, the best containing 80-85 per cent. aldehydes, the second quality, 75-80 per cent., and the lowest grade, 70-75 per cent. Other constituents of the oil are cinnamyl acetate and cinnamic acid. This oil gives the characteristic odour to Brown Windsor soap, and is useful for sweetening coal-tar medicated soaps. _Cedarwood oil_, distilled from the wood of Juniperus virginiana. Specific gravity at 15 deg. C., 0.938-0.960; optical rotation, -35 deg. to -45 deg.; 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.