The chief constituents of the oil are anethol, methyl chavicol, d-pinene, l-phellandrene, and in older oils, the oxidation products of anethol, _viz._ anisic aldehyde and anisic acid. Since anethol is the most valuable constituent, and the solidifying point of the oil is roughly proportional to its anethol content, oils with a higher solidifying point are the best. _Aspic oil_, from the flowers of Lavandula spica, obtained from France and Spain, and extensively employed in perfuming household and cheap toilet soaps; also frequently found as an adulterant in lavender oil. Specific gravity at 15 deg. C., 0.904-0.913; optical rotation, French, dextro-rotatory up to +4 deg., rarely up to +7 deg., Spanish, frequently slightly laevo-rotatory to -2 deg., or dextro-rotatory up to +7 deg.; esters, calculated as linalyl acetate, 2 to 6 per cent.; most oils are soluble in 65 per cent. alcohol 1 in 4, in no case should more than 2.5 volumes of 70 per cent. alcohol be required for solution. The chief constituents of the oil are: linalol, cineol, borneol, terpineol, geraniol, pinene, camphene and camphor. _Bay oil_, distilled from the leaves of Pimenta acris, and obtained from St. Thomas and other West Indian Islands. It is used to some extent as a perfume for shaving soaps, but chiefly in the Bay Rhum toilet preparation. Specific gravity at 15 deg. C., 0.965-0.980; optical rotation, slightly laevo-rotatory up to -3 deg.; phenols, estimated by absorption with 5 per cent. caustic potash solution, from 45 to 60 per cent.; the oil is generally insoluble in 90 per cent. alcohol, though when freshly distilled it dissolves in its own volume of alcohol of this strength. The oil contains eugenol, myrcene, chavicol, methyl eugenol, methyl chavicol, phellandrene, and citral. _Bergamot oil_, obtained by expression from the fresh peel of the fruit of Citrus Bergamia, and used very largely for the perfuming of toilet soaps. Specific gravity at 15 deg. C., 0.880-0.886; optical rotation, +10 deg. to +20 deg.; esters, calculated as linalyl acetate, 35-40 per cent., and occasionally as high as 42-43 per cent.; frequently soluble in 1.5 parts of 80 per cent. alcohol, or failing that, should dissolve in one volume of 82.5 or 85 per cent. alcohol. When evaporated on the water-bath the oil should not leave more than 5-6 per cent. residue. Among the constituents of this oil are: linalyl acetate, limonene, dipentene, linalol, and bergaptene. _Bitter Almond Oil._--The volatile oil obtained from the fruit of _Amygdalus communis_. Specific gravity at 15 deg. C., 1.045-1.06; optically inactive; refractive index at 20 deg. C., 1.544-1.545; boiling point, 176-177 deg. C.; soluble in 1 or 1.5 volumes of 70 per cent. alcohol.