e group of capryl odors (Linnaeus's _Odores hircini_),
so called from the goat, the most important group of odors from the sexual
point of view. Caproic and capryl acid are contained not only in the odor
of the goat and in human sweat, and in animal products as many cheeses,
but also in various plants, such as Herb Robert (_Geranium robertianum_),
and the Stinking St. John's worts (_Hypericum hircinum_), as well as the
_Chenopodium_. Zwaardemaker considers it probable that the odor of the
vagina belongs to the same group, as well as the odor of semen (which
Haller called _odor aphrodisiacus_), which last odor is also found, as
Cloquet pointed out, in the flowers of the common berberry (_Berberis
vulgaris_) and in the chestnut. A very remarkable and significant example
of the same odor seems to occur in the case of the flowers of the henna
plant, the white-flowered Lawsonia (_Lawsonia inermis_), so widely used in
some Mohammedan lands for dyeing the nails and other parts of the body.
"These flowers diffuse the sweetest odor," wrote Sonnini in Egypt a
century ago; "the women delight to wear them, to adorn their houses with
them, to carry them to the baths, to hold them in their hands, and to
perfume their bosoms with them. They cannot patiently endure that
Christian and Jewish women shall share the privilege with them. It is very
remarkable that the perfume of the henna flowers, when closely inhaled, is
almost entirely lost in a very decided spermatic odor. If the flowers are
crushed between the fingers this odor prevails, and is, indeed, the only
one perceptible. It is not surprising that so delicious a flower has
furnished Oriental poetry with many charming traits and amorous similes."
Such a simile Sonnini finds in the _Song of Songs_, i. 13-14.[78]

The odor of semen has not been investigated, but, according to
Zwaardemaker, artificially produced odors (like cadaverin) resemble it.
The odor of the leguminous fenugreek, a botanical friend considers,
closely approaches the odor given off in some cases by the armpit in
women. It is noteworthy that fenugreek contains cumarine, which imparts
its fragrance to new-mown hay and to various flowers of somewhat similar
odor. On some persons these have a sexually exciting effect, and it is of
considerable interest to observe that they recall to many the odor of
semen. "It seems very natural," a lady writes, "that flowers, etc., should
have an exciting effect, as the original and by