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230 DENTAL MEDICINE.

It is insoluble in. water, but soluble in ether and in hot oil of
turpentine, and has a peculiar smell. It is nervine, tonic and
stimulant, and in over-doses, poisonous. The vapor is irritating
to the conjunctiva and bronchial mucous membrane.
Diluted Phosphoric Acid is prepared by boiling phosphorus with
nitric acid and distilled water until it is dissolved, evaporating
and rediluting it. It may also be obtained by dissolving an ounce
of glacial phosphoric acid in three ounces of distilled water,
afterward adding forty grains of nitric acid, boiling to a syrup,
and diluting with water until the solution measures twelve and a
half ounces.
Medical Properties and Physiological Action.— It is tonic and re-
frigerant, and, in large doses, is a powerful stimulant to the nerv-
ous and vascular systems. It can be detected in the blood,
owing to its absorption, and, in large doses, is an irritant poison.
Therapeutic Uses.—Diluted phosphoric acid is employed in
scrofula, dropsy, hemoptysis, calculous disease, diabetes and car-
dialgia. Externally, it has been employed as a local application
in the treatment of caries of the bones and osseous tumors.
Dose.—Of dilute phosphoric acid, gtt. ij-xv, diluted in sugar
and water.
Dental Uses.—As a local application in the treatment of caries
of the maxillary bones and osseous tumors of the jaws. Inter-
nally, it has been administered with a view of supplying a defi-
ciency of phosphoric acid in the teeth. (^See Hypophosphites of
Lime^
DENTAL FORMULAE.
For Caries of the Maxillary Bones For Ulcers Over Carious Bones.
and Osseous Tumors of the '7aw. . • ,• • • ,
' -n i i
JJ.
-^ Acicli phosphonci gla-
"^^'^
R. Acidi phosphor, dilut. . I part ^J
Aquse destillatse 8 to lo parts. M. Aquae destillatae . . . f 5 viij
^''''^ Solutio.
SiGNA.—Apply as a lotion or injec-
tion. SiGNA.—To be applied on compresses
Phosphoric Acid in the**Anhydrous State consists of one equiva-
lent of phosphorus to five equivalents of oxygen (PO5), and it