optical rotation at 30 deg. C., -1 deg. 30' to -3 deg.;
refractive index at 20 deg. C., 1.4600-1.4645; saponification value, 7-11;
solidifying point, 19-22 deg. C.; iodine number, 187-194; stearopten
content, 14-20 per cent.; melting point of stearopten, about 32 deg. C.

A large number of constituents have been isolated from otto of rose,
many of which are, however, only present in very small quantities. The
most important are geraniol, citronellol, phenyl ethyl alcohol, together
with nerol, linalol, citral, nonylic aldehyde, eugenol, a sesquiterpene
alcohol, and the paraffin stearopten.

_Rosemary oil_, distilled from the herb Rosemarinus officinalis, and
obtained from France, Dalmatia, and Spain. The herb is also grown in
England, but the oil distilled therefrom is rarely met with in commerce.
The properties of the oils vary with their source, and also with the
parts of the plant distilled, distillation of the stalks as well as the
leaves tending to reduce the specific gravity and borneol content, and
increase the proportion of the laevo-rotatory constituent (laevo-pinene).
The following figures may be taken as limits for pure oils:--

French and Dalmatian.--Specific gravity at 15 deg. C., 0.900-0.916; optical
rotation, usually dextro-rotatory, up to +15 deg., but may occasionally be
laevo-rotatory, especially if stalks have been distilled with the leaves;
ester, calculated as bornyl acetate, 1-6 per cent.; total borneol, 12-18
per cent.; usually soluble in 1-2 volumes of 82.5 per cent. alcohol.

Spanish.--The properties of the Spanish oil are similar to the others,
except that it is more frequently laevo-rotatory.

Rosemary oil contains pinene, camphene, cineol, borneol, and camphor.

_Sandalwood oil_, obtained by distillation of the wood of Santalum album
(East Indian), Santalum cygnorum (West Australian), and Amyris
balsamifera (West Indian). The oils obtained from these three different
sources differ very considerably in value, the East Indian being by far
the best.

East Indian.--Specific gravity at 15 deg. C., 0.975-0.980; optical rotation,
-14 deg. to -20 deg.; refractive index at 20 deg. C., 1.5045-1.5060; santalol,
92-97 per cent.; usually soluble in 4-6 volumes of 70 per cent. alcohol,
though, an old oil occasionally is insoluble in 70 per cent. alcohol.

West Australian.--Specific gravity at 15 deg. C., 0.950-0.968; optical
rotation, +5 deg. to +7 deg.; alcohols, calculated as santalol, 73-75 per ce