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HYDROCHLORIC ACID. 227 ;

ferior in its disinfectant properties to those of chlorine. For
internal use the dilute acid, which is tonic, refrigerant and as-
tringent, is employed, acidum hydrochloricum dilutum,—diluted
hydrochloric acid, which is prepared by diluting the strong acid
so that four ounces of the acid are contained in a pint of diluted
acid. It is of a deep yellow color, and emits the odor of chlorine,
which is its principal constituent.
Therapeutic Uses.—The dilute hydrochloric acid is internally
employed in the treatment of calculous affections, gout, atonic
dyspepsia, typhus and typhoid fevers, continued fevers of child-
hood, syphilis, chronic whooping-cough, phthisis, etc., and ex-
ternally in diphtheria, ulcerated sore throat, cynanche maligna, etc.
Dose.—Of dilute hydrochloric acid, TTLx to Tllxxx, freely
diluted; otherwise, when swallowed, it is highly irritant and
corrosive.
Dental Uses.—The strong acid is employed in the dental
laboratory for dissolving zinc, in the preparation of flux for
soldering certain metals.
The strong acid is also employed as a local application in
gangrenous stomatitis or cancrum oris, for arresting the ulcerative
process ; but care is necessary in its use, on account of its pow-
erful action. Combined with equal parts of glycerine it is use-
ful in inflammation and ulceration of the oral mucous membrane
also, the same combination in cases of sloughing will induce a
healthy form of inflammation, and to limit its application to the
parts on which it is to act, collodion may be applied. For mild
cases of inflammation it may be diluted with an equal amount of
honey.
In aphthous ulcerations of the mouths of children, it is often
a useful application.

DENTAL FORMULA.
For Aphtha. For Chronic Injlammation of Mucous
Membrane and Gums.
R . Acidi hydrochlorici . I part R . Acidi hydrochlorici di-
Mellis . . • . . . 8 parts. M. ^"ti Tttx
Infusi cinchonas . . f 5 iv
SiGNA.—Apply with a camel-hair pen- Mellis f ^j. M.
cil. Fiat gargarysma.