All the qualities of this plant depend upon an essential oil and
camphor; it readily and strongly impregnates either water or spirit, by
infusion; its infusion, and the water distilled from the plant, are
carminative and antispasmodic; they also serve as vehicles for other
medicines, to correct their operation, or to disguise their flavour.
OFFICINAL PREPARATIONS. _Aq. Menth. Piperit_. L.E.D. _Spir. Menth. Pip_.
L.D. _Ol. Menth. Pip_. L.D. If this plant be cut in wet weather, it
turns black, and is worthless.