_Obs._ On the large scale, this extract is almost universally prepared by
exhausting the root by coction with water, as in the last formula. When
well prepared it is one of the smoothest and brightest extracts of the
Pharmacop[oe]ia. Good gentian root yields by infusion in hot water fully
50%, and by decoction about 60% of extract.--_Dose_, 10 gr. to 30 gr., two
or three times daily, as a stomachic bitter and tonic; either alone or
combined with rhubarb, ginger, or aloes. It is, however, more especially
used as a vehicle for chalybeates and other metallic preparations. The
principal consumption of extract of gentian is by the brewers, in lieu of
hops.
6. (HARD E. OF G.; E. D. DURUM, L.) The last dried by a gentle heat until
brittle enough to powder.
=Extract (Fluid) of Ginger.= _Syn._ EXTRACTUM ZINGIBERIS FLUIDUM. (Ph. U.
S.) As fluid extract of cubebs, but using rectified spirit.
=Extract (Fluid) of Golden Seal.= _Syn._ (Ph. U. S.) EXTRACTUM HYDRASTIS
FLUIDUM. _Prep._ Hydrastis (Golden Seal) in very fine powder, 16 oz.
(troy); macerate with 2 oz. (old measure) of glycerine; rectified spirit,
14 oz. (old measure), in closed percolator for 4 days; then let the
percolation commence, and finish it by adding a mixture consisting of 2
parts of spirit and 1 of water, until 24 oz. (old measure) have been
obtained. Remove the first 14 oz.; evaporate the remaining 10 oz. to 2
oz. (old measure), and mix with the reserved portion.
=Extract, Goulard's.= See SOLUTION OF SUBACETATE OF LEAD.
=Extract of Guaiac'um.= _Syn._ EXTRACTUM GUAIACI, L. _Prep._ 1. (Ph. L.
1746.) From lignum vitæ shavings or sawdust, exhausted by coction with
water; as soon as the mass becomes thick, 1-8th of rectified spirit is to
be added.
2. As the last, omitting the spirit. Diaphoretic, diuretic, and
alterative; in dropsy, gout, rheumatism, skin diseases, &c.
=Extract of Guarana'.= _Syn._ EXTRACTUM GUARANÆ, E. PAULLINIÆ, L. _Prep._
(Dr Gavrelle.) From tincture of guarana (seeds of _Paullinia sorbilis_),
prepared by coction with proof spirit. Tonic and alterative.--_Dose_, 2 to
5 gr., twice or thrice daily.
=Extract, Hæmostat'ic.= See EXTRACT OF ERGOT.
=Extract of Hedge Hyssop.= _Syn._ EXTRACTUM GRATIOLÆ, L. _Prep._ 1. (Ph.
Bor.) From the herb (_Gratiola officinalis_), as ALCOHOLIC EXTRACT OF
ACONITE--Ph. Bor.