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302 DENTAL MEDICINE.
tinue for at least one hour at a time, Signa.—To be applied as a lotion, on
covering with oilskin, to prevent lint saturated with it, and covered
evaporation. with oiled silk.
For Facial Neuralgia.
U . Ext. belladonnae . . . gr.ss
Quininae sulphat. . . gr.ij. M. For N^euralgia in Superficial Nerves^
Ft-Pil-No. I.
J, chloroformi,
SiGNA.-Use 3 times daily. ..
gp^^ ^j,^i ^^^^ ^^^
For Facial N^euralgia. Atropinae sulphat. . . gr.v. M.
B . Linimenti belladonnae, Signa.—To be applied on lint to
Linimenti aconiti . aa ^vij painful part, and covered with oiled
.
Chloroformi f 3 ij. M. silk.
For Neuralgia.
B . Ext. belladonnae gr.iv
Ext. stramonii gr.v
^
Ext. hyoscyami gr.v
Quininae sulphat Qij. M.
Ft. pil. No. XX.
Signa.—One pill 2 or 3 times a day.
AURUM TERCHLORIDUM—TERCHLORIDE OF GOLD.
Formula.—AUCI3.
Derivation.—The Terchloride of Gold is obtained by dissolv-
ing gold in aqua regia (three parts, by measure of hydrochloric
acid, and one of nitric acid), using gentle heat to hasten the so-
lution, the acids employed being chemically pure. The solution
is then evaporated to dryness, when ruby-red prismatic crystals
of the terchloride of gold result.
Properties and Action.—Terchloride of gold is very deliques-
cent, and is soluble in water, alcohol and ether. It possesses a
disagreeable, styptic taste, reddens blue litmus paper, and will im-
part a purple stain to the skin, which may be removed by a solu-
tion of cyanide of potassium. It is readily decomposed by many
metallic and non-metallic elements, and also by saline and or-
ganic compounds, on account of its elements being held together
by a feeble affinity. It is escharotic and disinfectant, and its physio-
logical effects are similar to those of corrosive sublimate. It is
not used internally.
Dental Uses.—In dental practice, the terchloride of gold, in