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292 DENTAL MEDICINE.

Local ArtiBsthetic.
Dr. J. E. Davis.
R. Antipyrine (5 percent.) grs.xxiij
Cocaine (10 per cent.) grs.48
Menthol grs.v
Oil cloves gtts.iij
Ether gtts.xx
Glycerine . . • 3J
Water (pure) ^j? M.
SiGNA.—Use with hypodermic syringe.

ANTISEPTIC AND STYPTIC COTTON-WOOL.
Antheptic Cotton.—First free the ordinary cotton wool from
grease, by macerating it in benzine for ten minutes, press and dry
in the air. Then steep the purified cotton, for ten minutes, in a
solution of tannin 5, carbolic acid 4, alcohol 50, and castor oil 8
parts.
Styptic Cotton-Wool.—Purify, as before, with benzine, dry in
air, and then steep it in a solution of alum 2, water 12, chloride
of iron solution 2 parts ; dry at 60° C.

AQUA DESTILLATA—DISTILLED WATER.
—
Derivation. " Take of water 80 pints. Distill two pints,
using a tin or glass condenser, and throw them away ; then distill
64 pints, and keep them in glass bottles."—U.S.D.
Properties.—Distilled water has a vapid, and by no means
pleasant taste, and is only perfectly pure when the vessel used in
the distillation is of silver. It should evaporate without residue.
Therapeutic Uses.—It is very essential in the preparation of
some formulae, and of no use whatever in others, as the common
pure water will answer. Such agents as tartar emetic, nitrate of
silver, corrosive sublimate, chlorides of calcium, barium, acetate
and subacetate of lead, permanganate of potassa, the sulphates of
iron and zinc, sulphate of quinia, the salts of morphia, and all
the alkaloids and their salts, require, when given in solution, dis-
tilled water.
Dental Uses.—Distilled water is required in the preparation of
many formulae for use in dental practice.