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Show 616 COMMON BLACK MUSTARD. Take of cantharides, each twelve parts ; yellow wax, four parts ; ——— sub-acetite of copper, two parts; mustard-seed, ———— black pepper, each one part: Having first melted the pitch and wax, add the turpentine, and to these, in fusion, andstill hot, add the other ingredients, res ducedto a fine powder, and mixed, and stir the whole carefully together, so as to forma plaster. This is supposed to be the most infallible blistering plaster, It certainly contains a sufficient variety of stimulating ingre. dients. Where a quicker actionis required, this is a better form thanthe ordinaryblister, but less suited for veryirritable skins, or for children. PRESCRIPTION. R.. 1. Take of mustard-seed, horse-radish root, of each, drachms 2, boiling water, a pint: Macerate for two hours, then strain; add to the strained liquor, ginger in powder two drachms, and aromatic confection one drachm, of which take a table-spoonful four times a day, in cold phlegmatic habits, and paralytic disorders. WATER-CRESSES. SISYMBRIUM NASTURTIUM. Class KV. Tetradynamia. Order I. Siliquosa. Essent. Gen. Cuar. Siliqua opening with nearly straight lines: Calyx spreading : Corolla spreading. SPec. CHAR. Siliques declining: Leaves pinnate, with the pinne sub- cordate, eee DESCRIPTION. A SMALL aquatic plant foundin ditches. The stalks are thick, and alternately branched. Stem with angular projections. Leaves alternate, lanceolate, pinnate, having above one pair, and below two to five pair of pinne, terminating in an odd one, which is the largest. Pinne oblong, irregularly crenate, blunt, opposite, Sessile, ovate, obtuse, rarely any veins beneath, of a bright green, those nearest the stem smallest. Lower leaves nearly heart-shaped. Flowers onshort terminal spikes, white. HISTORY. . Common in wet ditches and brooks, where it is gathered by simplers. Professor Martyn, in his Letters on Botany, ad- |