_Obs._ The juice of foxglove is very readily injured by exposure to air
and heat. The evaporation should therefore be conducted as rapidly as
possible, but at a low temperature. It is narcotic, sedative, and is
powerfully poisonous.--_Dose_, 1/2 gr., cautiously increased to 2 or 3 gr.
It is principally given in fevers, dropsy, diseases of the heart,
pulmonary consumption, epilepsy, scrofula, and asthma. This extract spoils
by long keeping. The last two are stronger than the rest, and keep better.
It is omitted in the present Ph. L.
=Extract of Fu'mitory.= _Syn._ EXTRACTUM FUMARIÆ, L. _Prep._ 1. From
either the infusion or decoction of the dried leaves of common fumitory
(_Fumaria officinalis_).
2. (B. Cod.) From the clarified juice of the fresh herb. Slightly
aperient, diaphoretic, and alterative. It has been given in obstructions
of the liver and cutaneous affections of the leprous kind.
=Extract of Galls.= _Syn._ EXTRACTUM GALLÆ, E. GALLARUM, L. _Prep._ 1.
From the infusion by maceration or displacement with cold water.
2. From the hot infusion or decoction. The first is to be preferred.
Astringent. Used chiefly in ointments and injections for piles, foul
ulcers, &c., and, internally, in hæmorrhages, spitting of blood, &c.
=Extract of Gen'tian.= _Syn._ EXTRACTUM GENTIANÆ (B. P.), L. _Prep._ 1.
(Ph. L.) Gentian root (sliced), 3 lbs.; distilled water (temperate), 4
pints; macerate for 12 hours, and gently express the liquor; repeat the
maceration with water, 1 quart, for 6 hours; and evaporate the mixed
liquors.
2. (Ph. L. 1836.) From the ordinary infusion of the root made with 10 or
12 times its weight of boiling water, the maceration being continued for
24 hours.
3. (Ph. E.) From an infusion prepared by percolation with cold water. The
formulæ of the Ph. Baden, Paris, and U. S. are similar.
4. (B. P.) Gentian, 1 lb.; water (boiling), 10; macerate for 2 hours, boil
15 minutes, strain, and evaporate to a soft pilular consistence.--_Dose_,
10 to 15 gr.