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240 DENTAL MEDICINE.

cases of chronic bronchitis, etc. In the form of spray, it is used
as a local application in diseases of air passages.
Dose.—Of sulphurous acid, TTLv to 5j, properly diluted.
Dental Uses.— Dilute sulphurous acid is efficacious in mercurial
stomatitis, aphthae, and mucous patches, gangrene of the mouth,
cancrum oris, ulcers of mucous membrane, and sloughing
wounds. It is an efficient and convenient disinfectant.

For Chilblains. For Destroying Parasites in Skin Diseases.
Bartholow. Startin.
R. Acidi sulphurosi . . ^iij R. Acidi sulpburosi,dil. . ^^ss
Glycerini .... 3J Sodii hyposulphitis . ^iij
Aquae 5 iss. M. Aqure, q. s. ad. ... 5 xvj. M.
SiGNA.—Apply as a lotion. SiGNA.—Apply as a lotion.
For Aphthce.
Dr. POTIER.
R . Acidi sulphuiosi ^^5 ij
Aquse, q. s. ad ^ ij. M.
SlGNA.—Mouth wash, or may be used as a spray.
ACIDUM TANNICUM—TANNIC ACID.
TANNIN.
/or/nw/tf.— C27H22O17.
Derivation.—Tannic Acid is obtained by exposing powdered
galls to a damp atmosphere for several days, when sufficient
ether is added to form a soft paste, which is allowed to stand for
twenty-four hours. It is then subjected to pressure as quickly as
possible, and the mass again treated with ether, to which iV of its
bulk of water has been added ; this is allowed to stand as before,
and is again subjected to pressure. The expressed liquids are
now combined and allowed to evaporate spontaneously ; then, by
the aid of a little heat, brought to a syrupy consistence, when it
is dried on plates in a hot air chamber, at a temperature not ex-
ceeding 212° F. Pure tannic acid is solid, uncrystallizable,
either white or slightly yellowish, inodorous, astringent to the
taste, but without bitterness, and with an acid reaction. It is
obtained in the form of vesicular masses, or thin, glistening
scales, or in the shape of fine threads of a pseudo-crystalline ap-