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Infusum Gentianae compositum, P. L. Iz8 I. Infusum amarum simplex, P. L. 1765. P. L. 1720.
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Infusum Rosae, P. L. 1787. Tinctura Rosarum, P. L. I 45 Tinctura Rosarum rubrarum, P. L. 1I20.
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Infusum Sennae simplex, P. L. II 87. Infusum Sennae Commune, P. L. I 745. Infusum Sennae, P. L. I 20.
In the last Pharmacopoeia there Was also an Insusion of Senna named Infusum Senna farfarizatum, to each pint of which two drachms of Supertartrate of Potass were added: it has ho ver been thought that the addition of this or any other sali might more convenientiu be made extemporane Cusly, in such proportions as circumStances may require.
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Macerate sor an ii our in a covered vesset, and stra in .
This insusion is intended to be used as a clyster, to Whichpurpose it is osten directed, and it is os considerable practicaIimportance to desine iis proper degree of strengili by a pre- scription like the present.
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THE term Muci lage is employed in Pharmacy to designate certain aqueous solutions whicli are very thicla and adhesive. In Chemist , it is confined to a union of gum With water,and, by some, has been conceived rather to designate a peculiar principie distinct Dom gum. The formen naucllage of Quince seed was much thinner than the others, and theresere has been transferred to decoctions. The mucilage of Tragacanth is omitted, hecause it seems to posSess no adVantage over that of Acacia gum, and it is more dissicultly solubie and very thicla, and Ut to hecome lunapy on dilution.
Muci lago Arabici Gummi, P. L. 1787.
Boiling Water, lials a pint. Rub the gum With the water gradu allyadded, utitit it incorporates into a naucllage.
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This naucllage is prepared by simple trituration of the powdered gum With the liot water. It is useful to recollectiliat this gum is also solubie in vegetable acids; insolubie in allioliol, and precipitaled by it ; and insolubie also in etherand otis. Is howevor it be trituraled with the expressed olis ei ther When illey are naturali y present as in the vegetabies containing them, or are added artificiat ly, it divides and suspen is their particles in water, forming the wlii te opaque suid, formerly called Emulsio. Some of the metallic salts of mercii , iron, and antimony appear to he changed by solution of gum, and theresere should be exhibited, in mixtures containing ii, with sonae cautiora. This naucllage ismo stly impure When srst sol med, frona the presence of eX-traneotis matters which have adhered to the gum, and such require to be separatod by pressing it through a coarsecloth.
MUCII AGE OF STARCH. Tulle os Starch, ili ree drachmS. Vater, a Pint.
Rub the starcti, gradu atly ad ling the
Starch rubs With cold Cater into a white opaque quid, and this, When healed, fornis a gelatinous liquor, Which maybe di sed through more botling water, but it precipitates
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after stan ling. It is insolubie in ether or alcohol. Thomson considers it to be a characteristic of this vegetable mat-ter, that it is solubie in infusion of galis at i 20'; precipitates as it coois, and may again be dissolved by an increa eos temperature : this seems to be the result os a combinationbet veen starch and the tannin contained in the galis.
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sinali quantity of rectilied spirit.
The generic term Extraci is used pharmaceuticalty in an cxtensive Sense, and comprietes ali those preparations Domvegetabies Whicli axe separabie by the agency of various liquids, and asterWards obtained DOm sucti solutions, m a solidstate, by evaporation of the menstruum: it includes also those substances whicli are held in solution by the natural j vices offresti planis, as Weli as those to Whicli some menstruum Isadded at the time of preparation. No , these solubie matters are various and mostly complicated, chemicat accuracytheresere is not to be looked for in the applicatum of the terna. Chemisis, hoWever, have confined this name to onepeculiar modification os vegetable matter, Whach they have