Essence of Guaiac′um. Syn. Fluid extract of guaiacum; Essentia guaiaci, Extractum guaiaci fluidum, L. Prep. Recent guaiacum shavings, from which the dust has been sifted, 3 cwt., are exhausted by coction in water, as in the preparation of an extract, using as little of that fluid as is absolutely necessary; the decoction is evaporated to exactly 13⁄4 gall.; it is next stirred until cold, to prevent the deposit of resinous matter, when it is put into a bottle, and spirit of wine, 5 pints, is added; the whole is then repeatedly agitated for a week, after which it is allowed to settle for 7 or 8 days, and the clear portion is decanted into another bottle.
Obs. This preparation is frequently substituted for guaiacum shavings in the preparation of compound decoction of sarsaparilla. 1 pint of this essence is considered equivalent to 19 lbs. of guaiacum in substance. See Decoction of Sarsaparilla (Comp.).
Essence for the Handkerchief. See Essentia Odorata, &c.
Essence for the Headache. Syn. Cephalic essence, Embrocation of ammonia, Dr Hawkins’ embrocation, Ward’s e., Ward’s essence for the headache; Embrocatio ammoniæ, Linimentum a., Essentia cephalica, L. Prep. 1. Oil of lavender (Mitcham), 1 dr.; camphor, 1 oz.; liquor of ammonia, 4 oz.; rectified spirit, 1 pint; dissolve. Very fragrant and powerful.
2. (Beasley.) Spirit of camphor, 2 lbs.; strong water of ammonia, 4 oz.; essence of lemon, 1⁄2 oz.
3. (Redwood.) Camphor and liquor of ammonia, of each 2 oz.; oil of lavender, 4 dr.; rectified spirit, 14 oz. Very fragrant. Stimulant and rubefacient. Used as a counter-irritant lotion in local pains, as headache, earache, colic, &c. Compound camphor liniment is usually sold for it. See Liniment.
Essence of Henbane. Syn. Essentia hyoscami, L. See Essence (Anodyne), No. 2.
Essence of Hop. Syn. Essentia lupuli, E. humuli, Tinctura lupuli concentrata, L. Prep. 1. New hops (rubbed small), 261⁄2 oz.; proof spirit, 1 quart; digest 24 hours, then distil over (quickly) 1 pint, and set the distillate (spiritus lupuli) aside in a corked bottle; to the residuum add water, 1 pint; boil 15 minutes, cool, express the liquor, strain, and evaporate it as quickly as possible to dryness by the heat of a water bath, powder the residuum, and add it to the distilled spirit; digest a week, and filter.
2. Lupulinic grains (yellow powder or lupulin of the strobiles), 5 oz.; rectified spirit, 1
pint; digest 10 days; express, and filter. Both the above are powerfully bitter, and loaded with the aroma of the hop. They are fully 8 times as strong as the ‘TINCTURA LUPULI’ of the Ph. L. A few drops added to a glassful of ale or beer render it agreeably bitter and stomachic.