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296 DENTAL MEDICINE.

washed with water and again dried. After such treatment the
carious cavity should assume a deep black color within two or
three days. In cavities so treated the progress of decay will gen-
erally be arrested either permanently, or for a considerable time.
As salt decomposes the nitrate of silver, a solution of the
chloride of sodium will relieve the excessive pain following
its application to sensitive dentine, or to ulcers of the mouth ;
such a solution will also remove recent stains, if followed by
the application of a solution of ammonia. Old stains may
be removed with tincture of iodine, followed by cyanide of
potassium.
A convenient way to keep nitrate of silver ready for use is. to
soak asbestos fibre in a saturated solution, and allow it to dry.
The antidote in cases of poisoning by nitrate of silver is
chloride of sodium (common salt), which converts it into chloride
of silver, to be followed by emetics, and the proper antiphlogistic
treatment. A solution of cyanide of potassium will remove
recent stains of nitrate of silver.

DENTAL FORMULA.
For Inflamed and Ulcerated Mucous ^<^ Ulcers and Aphtha.
Membrane. ^ Argenti nitratis . . . . ^ss
K. Argenti nitratis . . gr. ij to ^ss Aqus destillatje . . . . |j. M,
Aquae destillatae . . f^j. M. SiGNA.—To be applied with a camel 's-
^^ir brush.
SlGNA.—To be used as a lotion.
For Diseases of the Antrum. For Mercurial Stomatitis.
Argenti nitratis . gr. j to gr. v
R . . R . Argenti nitratis . . . gr. ss
Aquse destillatae M. M.
. . . f Aquce destillatae . . . f^j.
Jj.
SiGNA.—To be used as an injection. SiGNA.—To be used as a mouth wash.
ARISTOL—DITHYMOL-DIIODIDE—DITHYMOLBINIODIDE.
Formula.— C^^.J^O\\.
Derivation.—Aristol is obtained by adding a solution of iodine
in iodide of potassium, to an equal solution of hydrate of sodium,
containing thymol. It is in the form of a red-brown, precipitated,
amorphous, non-crystallizable powder. The proportion of iodine