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tract, it is exposed to so much heat, as must have sonae effect iapon iis viriues, and perhaps not totheir advantage : and in administering it, is great care is not taken to mix it intimately With a Proper Vehicle, or sonae very solubie substance, in weali boweis it osten purges, and not Onlydis appotnis the prescriber, but injures the patient. A smali quantity of the Cortex Winteranus added, gives the medicine a grateit Warnath, and renders a quantity of compotand water tessnecessary. And a litile liquorice, a seW raisins, gum Arab)c, or the like, added to the decoctionbesore it is taken frona the fire, by mahing the liquor viscid, en abies it to suspend more of the fine particles of the Barii, and thereby improves the essicacy of the medicine, arad, at the fame time, renders it lesi dilagreeable. Vo L. II.
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BROUGIIT FROM AFRICA . IN hopes that sonae of your correspondenis may have it in their poWer to Proctare Us ad rug, whicli, frona a se trials ali eady made ofit, proinises great ad vantage to the public: Itake the liberty to send the following descriptionand accoUnt of it. It is a hard britile gum, of a deep red or almost blacti colour, and opaque ; except the Veryminute fragments of it, Whicli appear like biis of garnet, red and trans parent. It has no smeli ; but, applied to the longue, it soon discovers a strong, but grates ut astrin
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ao Account of an afringent Gumgency ; and great part of it dissolves readi ly in
the mouili, with sonaeWhat of a mucilaginous meetness, joined with iis styptici ty. When itis coarsely poWdered, and thrown into Water, abolit sive or fix paris in seven, as near as I Canguess, s on disibive, and communicate a deepred colour, and a strong astringent iaste to themater: most of What rem ains undissolved ap- Pears to be resinous. This gum differs frona thered lumps of the common gum Senegat, in being much more britile ; and frona the sanguis draconis of the shops, in dissolving in water; and Dom both, in having so remarkable a stypticitywhen lasted. Iis externat appearance, indeed, is si much like that of the genuine or Unmanti actu reddragon 's buod, that a good judge may eastly bedeceived thereby; but iis astringent iaste and solubility in Water manifest an essentiat differ
I have had specimens sent me of an opaque reddisti gum, but seemingly the produce of a very different tree, as it does not dissolve so rea-dily in Water as thd former, and iis taste is bitterand austere. The first time I had any intimation of the gum I have been describing, was in a Consultationwith the latu Dr. Oidileid, on account of an obstinate chronical diar bum, in Whicli severat em- cactous medicines had been used in vain. Onthis occasion the Doctor one day mentioned theguod effecis he had met With in sonae such cases stom
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srom a gum which he called the trae gin Sene-gal, and descri bed it to be of a deep red colour, a Meetisti astringent iaste, and britile. As I Was at that time intent upon collectingand examining whatever had relation to the Materia Medica, I en quired sor fuch a gum
amongst the most considerable dealers and importers, but met with nothing that answered the Doctor's description. A feW years a ter this, in my return srom Scar-borough, I called tapon an eminent druggist at York, who, amongsh other curious parceis of drugs, saewed me the gum above described, forsonae of the finest dragon's blood, orsanguis draronis os . he had ever feen.
ranged Under that name, as it was, for the most Pari, a Ueolas, manis es ly altringent, and muci-laginous ; from Whicli circumstances, and iis externat appearance, I judged it Was the gum that Dr. Oldfield had described to me under the litteos the true gum Senegat ; though I think there issood reason to object to this appellation, as thelitile me have yet received comes principallysrom the river Gambia, and the common gum
Senegat has been in possession of that name, sofar as appears to me, from iis si st discovery
Is a name was to be given to the drug in question, it may not be improper to cali it, Gummi Rubrum Uringem
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eta Account of an os ingent Gum
io the most Curio is of his customers, as a rare sort of the true di agon 's blood.
This information induced me to look into thebooks of sonae of the later African travellers, in One of whicli, viz. Moor r Traveis into the nundParis of Africa, we have the following accounts of it. In a letter of instructions frona the Go- vernor of Iames's Fort, in the mouth of the riverGambia, to our author at Brucoe, a factory tapthis river, dated May 27, 1733, is the following ParagraPh, P. II 3, edit. 2d. There is a red liquor that blee is plentifully from the bark of a tree called ' pau de Upon the incision, and in litile time hardens to the consistence Os gum, Whicli is of great Valhae : and theres Ore yoia are destred to hise your Utinost to Procure large quantities
In reply to this, Our author Writes, the nexi monili, to the GOVernor as sollows :
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You Will observe, si om the instructions given
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24 Account of an afringent Gum,
to OUr author, that at least seme expectations hastheen formed of iis uses ulnesis ; and indeed, Domthe trials that have been made, Dom iis sensibie qualities, and Dr. Oidileid's experience, I cannot but thinti it an article Worth enquiring after, asit may in time become a valvabie addition to the Materia Medica, as meli as of some litile benefit in commerce, and perhaps in colouring like-wise. The distempers in whicli this drug seems topromise seme Uvantage, are, in particular, habituat diarrhias, suor albus, immoderate menstruat discliarges; and, in generat, ali such disieases as proceed from laxity and acrimony.
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O ILS, RESINOUS AND PINGUIOUS SUBSTANCES WΙTH WATER,
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26 Experiments on mising Osis,
I put the fame quantity of Oil and water tolials an ounce of the mucilage. This mixture likewise, by agitation, soon hecame like an emulsion, and rem ained so as long as the former. EXPERIMENT III. I tried the same experiments with a like quantity of Oil of almoniis. A perfect uniform mulsion was produced; but, oia standing threeor solar minutes, a separation ensu ed. EXPERIMENT IV. Two drachms of Oil of almonds, half an ounce of the mucit age, and two OUn Ces of Water, Were Put