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506 DENTAL MEDICINE.
DENTAL FORMULA.
Antiseptic and Stimulant Mouth Wash. fgy Alveolar Fyorrhaa.
For use in Alveolar Pyorrhoea,
Dr. a. W. Harlan.
etc., etc.
^' hydrogen perox. . J
rogen
perox.
Dr. Chas. B. Atkinson. ^ . . . ^j
Hydrarg. bichlor. . . gr.^. M.
B . Hydrogen perox. . . ? iv —
T,. ^ 111 • HT SiGNA.—Inject into pockets until theyInject into pockets unt
Tinct. calendulae . . M. .
31J.
are free of all foreign matter.
SiGNA.—Use daily.
PEROXIDE OF SODIUM—SODIUM PEROXIDE—SODIUM DI-OXIDE.
Formula.—NagOg.
Derivation.—Sodium Peroxide is obtained by adding the perox-
ide of hydrogen to an excess of caustic soda solution of twenty
per cent., and then pouring into alcohol. Chemically considered,
it is the analogue of peroxide of hydrogen.
Properties.— It is a strongly alkaline and caustic white solid,
soluble in water, when it produces an increase of temperature and
evolves a certain amount of oxygen, with scarcely any loss of the
latter if the peroxide of sodium is added to the water in small
quantities and gradually stirred in ; when the solution is made
hurriedly by the addition of large quantities of the powder to the
water at a time, the evolution of heat, due to the energy of the
combination, causes rapid elevation of the temperature of the
solution and the decomposition of the peroxide.
It is necessary to protect this preparation of sodium from
moisture, and if exposed to the air its weight increases twenty
per cent, in twenty-four hours. The presence of water and con-
tact with organic matter produces inflammation in such matter,
hence it is necessary to handle this drug with care.
Peroxide of sodium very closely resembles peroxide of hydro-
gen in the readiness with which it separates from the extra atom
of oxygen it contains, and its bleaching property depends upon
this extra atom of oxygen, which, when liberated, seizes upon
the hydrogen of the organic color-compound, thus destroying its
identity. While peroxide of hydrogen contains but three or four
per cent, of available bleaching oxygen, peroxide of sodium con-
tains about twenty per cent., and as a bleaching agent, antiseptic,