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SULPHATE OF COPPER. 381

often relieves facial neuralgia. The dose should be diminished
after two or three days to five grains or less as occasion demands.
Daze.—Of croton-chloral hydrate, gr. v to gr. x ; as an
anaesthetic, gr. xv, dissolved in warm water.
Dental Uses.—It is employed with effect in facial neuralgia, in
doses of from two to five grains every hour or two, until fifteen
grains have been taken ; also as a sedative, in doses of from
three to five grains, in periodontitis, pulpitis, etc., etc.

DENTAL FORMULA.
For Neuralgic Odontalgia. For Neuralgia.
Von Kirchbauer.
R. Croton chloral . . 3J Dr. Glassington.
Glycerini ... • 3^J
Aquffi destill. . . . • 5"ss R . Hydrate of butyl-chloral gr.v
Syr. aurantii . . . • 3'v Syrup of Tolu . . . . tj
Oleum foeniculcE . . • gtt.vj. M. Spirit of chloroform . . X(\x
SiGNA.—A tablespoon ful, and if pain Aquae gjss. M.
continues severe, repeat the dose in SiGNA.—Dose to be repeated in one
an hour. hour if relief is not obtained.
CUPRI SULPHAS—SULPHATE OF COPPER.
BLUE VITROL, BLUE STONE.
i^?m«/tf.—CUSO4+3H2O.
Derivation.—Sulphate of copper is obtained by roasting the
native sulphuret, or by the combination of oxide of copper and
sulphuric acid, filtering and crystallizing. It is in the form of
blue prismatic crystals which, after exposure to the air, effloresce
to a slight degree, and become covered with a greenish-white
powder. It has an astringent, metallic taste.
Medical Properties and Action.—Sulphate of Copper is emetic,
tonic, nervine, stimulant and astringent, and is quite soluble in
water, but insoluble in alcohol. It is a prompt and efficient
emetic, the emesis commencing a few minutes after it reaches
the stomach, and the copper comes up with the vomited matter.
Little or no depression follows its administration as an emetic, and
it is especially adapted to cases of narcotic poisoning.
Therapeutic Uses.—Sulphate of Copper is employed as a
prompt and efficient emetic in cases of poisoning; it is also ad-