Imponderabilia means which is not weighable, i.e. the substances which have no perceptible weights, they are immaterial power or energy; may be natural or artificial.

Medicines prepared from energy, available from natural and physical reactions are called imponderabilia.

Hahnemann observes in his Organon, aphorism 280, Footnote that, “even imponderable agencies can produce most violent effects upon man.” Dr. H. W. Allen describes their mode of preparations and symptoms in his ‘Materia Medica of Nosodes‘. Elizabeth Wright mentions six such sources of drugs in his book ‘A Brief Study Course in Homeopathy‘. Dr. Caspari, Jhar, Clarke, Swan and John Butler etc have described their symptoms.

Examples are:

1. Luna [ Full Moon ], Magnetis Poli Ambo [ Magnet ], Magnetis. Polus Australia [ South-pole of magnet ], Radium, Sol [ Sun's ray ].
2. Artificial – Magnetis Artificialis; X-Ray; Electricitus.

Family Pinaceae

Picea glauca (Moench) Voss
Picea: Classical Latin name for “pine”
glauca: Greek meaning “grayish or bluish-green”

Syn.—Hemlock; Spruce.
P. E.—Resin.
N. O.—Coniferae.
N. H.—Northern part of the United States.

Plant : perennial, 50′-60′ tall, evergreen tree; stems hairless, branchlets not drooping

Fruit : 1-2″ long cones, dropping when ripe

Leaf : 3/8-3/4″ blue-green needles

Habitat : dry to dry-medium; uplands

Properties: Astringent, stimulant.

Use: The oil of hemlock is very extensively used in liniments. The oleoresin commonly known as Canada pitch is used in plasters very extensively. The tincture is valuable in obstinate cases of leucorrhea; 1 part of specific pinus canadensis to 3 parts of castor oil applied locally to walls of vagina and cervix of uterus every other day is of great value. A little echinacea and tiger lily may be added. Of value locally as an astringent in sore throat.

—————-

Botanical: Tsuga Canadensis (CARR.)
Family: N.O. Pinaceae

—Synonyms—
Hemlock Pitch. Canada Pitch. Pix Canadensis. Hemlock Bark. Pinus Canadensis. Abies Canadensis. Hemlock Gum. Hemlock Spruce.

—Part Used—
The bark encrusted with hardened juice.

—Habitat—
North America.

—Description—
The flow of juice from incisions in the bark is much less than in most of the species, but at the time of late maturity a spontaneous exudation partly evaporates, hardening on the bark, which is stripped, broken in pieces, and boiled in water. The melted pitch is skimmed off and boiled for a second time. The product is of a dark reddish-brown colour, brittle, hard, opaque, almost tasteless, and with a very slight odour. It melts and softens at a low temperature.

An extract of the bark is used in tanning.

—Constituents—
Besides resin, there is found a volatile oil, oil of spruce or oil of hemlock, and tannin.

—Medicinal Action and Uses—
Canada Pitch is softer than Burgundy Pitch, so that even the temperature of the body makes it inconvenient to handle. It is a mild rubefacient. The liquid extract has been used as an astringent. It resembles rhatany in its action.

The volatile oil is used in veterinary liniments, and to procure abortion, but it is very dangerous for this purpose.

Hemlock or Canada Pitch Plaster can be made by melting together go parts of Canada Pitch to 10 parts of Yellow Wax, straining and stirring until it cools and thickens.

Fluid extract, 1/4 to 1 drachm.

—Other Species—
Pseudotsuga tascifolia, the branches ofwhich give out an emanation which, after being inhaled for some hours, is reported to have caused stupor, involuntary evacuation of urine, and collapse followed by psychic disturbance.

http://www.botanical.com/botanical/mgmh/p/pinusb40.html#des

The Strychnine tree (Strychnos nux-vomica) also known as Nux vomica, is an evergreen tree native to southeast Asia, a member of family Loganiaceae. It grows in open habitats, usually attaining a size about 25 meters tall.

It is a major source of the highly poisonous alkaloid strychnine, derived from the seeds inside the tree’s round, green to orange fruit. However, the tree’s bark also contains poisonous compounds, including brucine.

In homeopathy, Nux-v. — as it is commonly abbreviated — is one of the most commonly prescribed remedies.

Arnica usually refers to Arnica montana, a mountain plant used for relief of bruises, stiffness, and muscle soreness in herbal medicine. Arnica is widely used as a salve for bruises and sprains, and sometimes as a tincture, for the same anti-inflammatory, pain-relieving purposes. It is available in natural/health food stores, most commonly in gel form, to be applied to the affected area approximately three times daily.