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Show 276 PRICKLY SALTWORT. tartrate of potash andtartrate of soda, each possessing their owa properties, there results a triple salt having peculiar properties. The tartrate of potash and soda forms large and very regular crystals, in the form of prisms with eight sides, nearly equal, which are often divided longitudinally, almost through their axis. It has a bitter taste. It is soluble in about five parts of water, and efiloresces in the air. It is d« somposed bythe strong acids, which combine with the soda, and separate super-tartrate of potash, and by baryta and lime. By heatits acid is destroyed. It consists of 54 tartrate of potash, and 46 tartrate of soda. MEDICAL USE. It was introduced into medical practice by M. Seignette, an apothecary at Rochelle, whose name it long bore. It isstill frequently employed ; and though less agreeable than: the phosphate of soda, it is much more so than the sulphate of soda. It is less purgative than these, and must be given in larger doses. OFFICINAL SWALLOW-WORT. ASCLEPIAS VINCETOXICUM. Class V. Pentandria. Essen T. GEN f ae Ne Cc HAR, Nectaries five, 3 to q aped, and bent inwards, SPEC, - CHAR: : Leaves ova vate 3 barbed Order I. Digynia. o Vvvate 3 concave from the botton : Ph at the base:: Stem erect: VU Umbels° pro- a , DESCRIPTION, STALKS about a foot in hei : ght, erect, above green, below pur: Flow plish. axille of the arising in clusters at the leaves . ee hens Pe bie divided into five segments. Follicles two, ob- pie, e-celle les » one-valved. ope Seeds numerous, crowned with HISTORY. A nati tye native of Britain in the north, and cultivated in the gardens. 1 MEDICAL VIRTUE. t is CS © ’ ’ eee. Asclepian, from ’AcxAysies, Aesculapius, and Vinto conquer, and roeinds, a Greek word signifyin r » romvincere . 7 7 . 7S Poison. Hence its high reputation when poisons |