. The elements of materia medica and therapeutics (Volume 2) . ly Senna (C. elongata). b. Leaflet of ditto {Royle). SENNA. 597 229. A serious adulteration has been sometimes practised on the con-tinent, by the substitution of the leaves of Coriaria myrtifolia forthose of senna (Journ. de Chim. Med. i. 284). They are ovate-lanceolate, grayish-green with a bluish tinge, three-nerved, with astrongly marked midrib; the two lateral nerves disappear towardsthe summit of the leaves. Chemically these leaves are distin-guished by their infusion yielding, with gelatine, a whitish precipi-tate (tannate o
. The elements of materia medica and therapeutics (Volume 2) . ly Senna (C. elongata). b. Leaflet of ditto {Royle). SENNA. 597 229. A serious adulteration has been sometimes practised on the con-tinent, by the substitution of the leaves of Coriaria myrtifolia forthose of senna (Journ. de Chim. Med. i. 284). They are ovate-lanceolate, grayish-green with a bluish tinge, three-nerved, with astrongly marked midrib; the two lateral nerves disappear towardsthe summit of the leaves. Chemically these leaves are distin-guished by their infusion yielding, with gelatine, a whitish precipi-tate (tannate of gelatine) ; and, with sulphate of iron, a very abun-dant blue precipitate {tannate of iron). Furthermore, it formsprecipitates with bichloride of mercury, emetic tartar, and chlorideof barium. Composition.—Three analyses of senna have been made; in 1797, by Bouillon La Grange [Ann. Chim. xxiv. 3); a second Leaf of Cori-by Braconnot (Journ. Phys. lxxxiv. 281); and a third, in 1821, by ariafJ^rtULassaigne and Fenuelle (Ann. Chim. et Phys. xvi. 16):. folia. Senna Leaves. Senna Pods. Braconnot. Lassaigne and Fenuelle. Fenuelle. Bitter matter of senna 53-7 Matter similar to animalmucus, precipitable by Cathartin. Yellow colouring matter. Volatile oil. Fixed oil. Albumen. Mucus. Malic acid. Malate and tartrate of lime. Acetate of potash. Mineral salts. [Insoluble matter (lignin, &c.)] Cathartin. Yellow colouring matter. Volatile oil. Fixed oil. Albumen. Gum. Malic acid. Malates of potash and lime. Mineral salts. Silicic acid. Lignin. Malate (or some other vege- Acetate of potash j .Chloride of sodium j V lraces Watery extract of Alexandrian senna. Legumes of Cassia auctifolia. 1. Odorous principle; Volatile Oil of Senna.—Obtained by submitting the leaves, with water,to distillation. It has a nauseous odour and taste. The distilled water of senna, which containssome oil in solution, acts as a mild purgative only. 2. Cathartine ; Purgative Principle of Senna.—Yellowish-
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