Part IT.

The Materia Medica.

TURPETHUM, five Turbib[£. ] Turbith; the cortical partof the root of an Indian convolvu-lus, brought to us in ob'ong pieces,of a brown or aft; colour on theoutfide, and whitifh within : thebeft is ponderous, not wrinkled,eafy to break, and discovers alar, e quantity of reiinous matterto the eye : its tafte is at firftfweetifh ; chewed for a little time,it becomes acrid, pungent, andnaufeous. This roof is a cathar-tic, not of the fafeft or moft cer-tain kind : the refmous matter, inwhich its virtue refides, appears tobe very unequally diilributed, in-fomuch that fome pieces, takenfrom a fcrupie to a dram, purgeviolently ; while others in largerdofes, havefcarce any efteil at all.An extraft made from the root ismore uniform in ftiength, thoughrot fuperior, or equal, to purga-tives more common in the ihops. '

TUSSIL AGINIS five far far*,folia, fiores : Tujjilaginis vulgarisC. B. Ccltsfooc : tiie leaves andflowers [£\]

This grows wild in wateryplaces, producing yellow flowersin February and March ; frhel'eloon fall off, and are fucceeded bylarge roundifti leaves, hairy un-derneath : their tafte is herbace-ous, fomewhat glutinous and i'uba-crid. Tuflilagoitands recommend-ed in coughs, and other diiordersof the bieaft and lungs; the flow-ers are an ingreuient in thd pecto-ral decoftion ot the Edinburghpharmacopceia.

TUTIA [L. E .] Tutty ; animpure fublimate of zinc, or anargillaceous fubllance impregnatedtherewith, formed into tdbalouspieces like the bark of a tree. Itis moderately hard aiid pondeious,of a brownilh colour, and full of

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fmall protuberances on the out-fide, fmooth and yellowifti with-in : fome pieces have a blueifhcall, from minute globules ot zincbeing thrown up by the heat inits metallic form. Tutty is cele-brated as an ophthalmic, and fre-quently employed as fuch in un-guents and collyria : it gives nameto an officinal ophthalmic ointment[Z. E. ] See the article Z incum.

VALERIANAE HORTENSISMAJORIS radix . Valeriana ma-jor is odor at a r ad ice f- B. Thegreater garden valerian ; its roots

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'I his is an oblong wrinkledroot, with feveral fibres at thebottom, of a brownilh or alh co-lour on the outfide, and whitiftiwithin ; of an aromatic ftnell andtafte, approaching to nard. It isaccounted !efs eflicacious as a me-dicine than the following.

VALERIANAE STLVESTRTSradix: Valeriana fylve/lris majo-ris montance C. B. Valeriana: Jyl-'tefiris majoris foliis angujiioribus

MoriJ~on. plant, umbeilif. Wildvalerian (the narrow-leaved fort,growing on open, dry, mountain-ous places) its root \L. £.]

This root confills of a numberof firings or fibres matted together,ifluing from one common head ;of a whitiih or pale brownilh co-lour : its IVnell is flrong, like amixture of aromatics wit-f ietids ;the tafte unpleafantly warm, bic—terifli, and fubaCrid. There is an-other wild valerian, with broaderleaves, of a deeper and (hininggreen colour, met with in watery-places. Both forts have hithertobetn ufed indifcriminately, andl.innxus has joined them into onefpecies, under the n^me of 'Valeri-ana foliis cstnibus ' pi mat is. Ourcollege have retrained the Ihops

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