TECHU [para. 721]).

723. Oak Bark

Oak Bark is an astringent and tonic.

It is _used externally_ in the form of decoction, to restrain bleeding
from lacerated surfaces. As a local astringent, it is used in the
form of decoction, as a gargle in sore throat and relaxed uvula.

It is _used internally_ in the same diseases as catechu, and when
combined with aromatics and bitters, in intermittent fevers.

_Dose_ of the _powder_, from fifteen to thirty grains; of the
_decoction_, from two to eight drachms.

724. Logwood

Logwood is not a very satisfactory astringent.

It is _used internally_ in diarrhoea, the last stage of dysentery, and
a lax state of the intestines.

_Dose_, of the _extract_, from ten grains to one drachm; of the
_decoction_ from one to three ounces, three or four times a day.

725. Rose Leaves

Rose Leaves are stringent and tonic.

They are _used internally_ in spitting of blood, hemorrhage from the
stomach, intestines, &c., as a gargle for sore throat, and for the
night sweats of consumption. The infusion is frequently used as a
tonic with diluted sulphuric acid (oil of vitriol), after low fevers,
or in combination with Epsom salts and sulphuric acid in certain
states of the bowels.

_Dose_ of _infusion_, from two to four ounces.

[TO-DAY, ENJOYS HIS HALLS, BUILT TO HIS MIND.]

726. Chalk

Chalk, when prepared by washing, becomes an astringent as well as
antacid.

It is _used internally_ in diarrhoea, in the form of mixture, and
_externally_ as an application to burns, scalds, and excoriations.

_Dose_ of the _mixture_, from one to two ounces.

727. White Vitriol

White Vitriol, or Sulphate of Zinc, is an astringent, tonic, and
emetic.

It is _used externally_ as a collyrium for ophthalmia (See DOMESTIC
PHARMACOPEIA, _par. 475 et seq._), and as a detergent for scrofulous
ulcers, in the proportion of three grains of the salt to one ounce of
water.

It is _used internally_ in indigestion, and many other diseases; _but
it should not be given unless ordered by a medical man, as it is a
poison._

728. Local Stimulants.

Local stimulants comprise emetics, cathartics, diuretics,
diaphoretics, expectorants, sialogogues, errhines, and epispastics.

729. Emetics.

Emetics are medicines given for the purpose of causing vomiting, as in
cases of poisoning. They co