The leaves smell like celery or parsley, these being most toxical in summer, and the root in spring. The potency of the plant depends on its cicutoxin, a principle derived from the resinous constituents, and [252] which powerfully affects the organic functions through the spinal cord. It was either this or the Spotted Hemlock, which was used as the State poison of the Greeks for causing the death of Socrates.
For a fomentation with the Water Hemlock half-a-pound of the fresh leaves, or three ounces of the dried leaves should be boiled in three pints of water down to a quart; and this will be found very helpful for soothing and healing painful cancerous, or scrofulous sores. Also the juice of the herb mixed with hot lard, and strained, will serve a like useful purpose.
For pills of the herb take of its inspissated juice half-an-ounce, and of the finely powdered plant enough when mixed together to make from forty to sixty pills. Then for curing cancer, severe scrofula, or syphilitic sores, give from one to twenty of these pills in twenty-four hours (Pharmacopeia Chirurgica, 1794).
An infusion of the plant will serve when carefully used, to relieve nervous and sick headache. If the fresh, young, tender leaves are worn under the soles of the feet, next the skin, and are renewed once during the day, they will similarly assuage the discomfort of a nervous headache. The oil with which the herb abounds is not poisonous.
The Black Henbane grew almost everywhere about England, in Gerard's day, by highways, in the borders of fields, on dunghills, and in untoiled places. But now it has become much less common as a rustic herb in this country. We find it occasionally in railway cuttings, and in rubbish on waste places, chiefly on chalky ground, and particularly near the sea. The plant is biennial, rather large, and dull of aspect, with woolly sea-green leaves, and bearing bell-shaped flowers of a lurid, creamy colour, streaked and spotted with purple. It [253] is one of the Night-shade tribe, having a heavy, oppressive, sub-fetid odour, and being rather clammy to the touch. This herb is also called Hogsbean, and its botanical name, Hyoscyamus, signifies "the bean of the hog," which animal eats it with impunity, though to mankind it is a poisonous plant. It has been noticed in Sherwood Forest, that directly the turf is pared Henbane springs up.
"To wash the feet," said Gerard, "in a decoction of Henbane, as also the often smelling to the flowers, causeth sleep." Similarly famous anodyne necklaces were made from the root, and were hung about the necks of children to prevent fits, and to cause an easy breeding of the teeth. From the leaves again was prepared a famous sorcerer's ointment. "These, the seeds, and the juice," says Gerard, "when taken internally, cause an unquiet sleep, like unto the sleep of drunkenness, which continueth long, and is deadly to the patient."
The herb was known to the ancients, being described by Dioscorides and Celsus. Internally, it should only be prescribed by a physician, and is then of special service for relieving irritation of the bladder, and to allay maniacal excitement, as well as to subdue spasm.
The fresh leaves crushed, and applied as a poultice, will quickly relieve local pains, as of gout or neuralgia. In France the plant is called Jusquiame, and in Germany it is nicknamed Devil's-eye.
The chemical constituents of Henbane are "hyoscyamine," a volatile alkaloid, with a bitter principle, "hyoscypricin" (especially just before flowering), also nitrate of potash, which causes the leaves, when burnt, to sparkle with a deflagration, and other inorganic salts. The seeds contain a whitish, oily albumen.
The leaves and viscid stem are produced only in [254] each second year. The juice when dropped into the eye will dilate the pupil.