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500 DENTAL MEDICINE.

and deodorizer. In the form of a thin paste made by mixing
pepsin with water containing some two per cent, of hydrochloric
acid, it is introduced into the pulp canal after the removal of the
decomposed matter, and confined by a temporary filling in the
crown cavity, being permitted to remain for twenty-four hours,
when it is removed and the canal syringed with tepid water,
and if necessary, the application of the pepsin paste repeated
until the odor of decomposition can no longer be detected.
Pepsin, in the form of the paste, is also applied to partially de-
composed dentine, which may, for good reasons, be permitted to
remain immediately over the pulp of the tooth, the action of the
pepsin being confined to dead matter alone. The hydrochloric
acid and pepsin paste has also been recommended for devitalizing
the pulps of teeth where rapid action is not desired, the quantity
employed being about one-fifteenth of a grain.

DENTAL FORMULAE.
For Suppurating Dental Pulps. ^o^ Indigestion.
MlALHE.
Oakley Coles. t> t) • •
R. Pepsim jiss
R. Acidi hydrochlorici . ITLJ M"^ f^viss
Vini xerici f^xiiss
Aquae destillate . . . Tltxl
Pepsini porci . . . . q. s. Alcoholis f 3 iij
Sacchari ^j
SiGNA.—To be applied to suppurating Signa.—A tablespoonful immediately
PuJps- after each meal.
Ingluvin is a ferment prepared from the gizzard of the
chicken, and its effects are analogous to those of pepsin. It is
employed internally for indigestion, etc., and to. prevent nausea
and vomiting.
Dose.—Of Ingluvin, grs. v to 3j.

. PEROXIDE OF HYDROGEN—HYDROGEN PEROXIDE.
HYDROGEN DIOXIDE.
Formula.— H202.
Derivation.—Peroxide of hydrogen is obtained bv rubbing up
peroxide of barium with distilled water, so as to form a liquid