. The elements of materia medica and therapeutics (Volume 2) . omewhat ovate-oblong, or irregularly-shaped con-vex particles, with small mammillary processes occasionally projecting from someportion of the surface, and which are especially evident after the particles havebeen in water for a few minutes. The rings are very fine. The hilum is circu-lar, and cracks in a linear or stellate manner. Portland Arrow-root is obtained from Arum maculatum (see p. 86). East India Arrow-root is the fecula procured from Curcuma angustifolia, and will be describedhereafter. Brazilian Arrow-root is the fecula
. The elements of materia medica and therapeutics (Volume 2) . omewhat ovate-oblong, or irregularly-shaped con-vex particles, with small mammillary processes occasionally projecting from someportion of the surface, and which are especially evident after the particles havebeen in water for a few minutes. The rings are very fine. The hilum is circu-lar, and cracks in a linear or stellate manner. Portland Arrow-root is obtained from Arum maculatum (see p. 86). East India Arrow-root is the fecula procured from Curcuma angustifolia, and will be describedhereafter. Brazilian Arrow-root is the fecula of Jatropha Manihot. It is described by M. Guibourt (Hist,des Drop. ii. 456, 3me ed.) under the name of Moussache or Cipipa, and will be noticed hereafter(vide EuniORBiACEiE). Tahiti Arrow-root is the fecula of Tacca pinnatifida, and has already been noticed (p. 146). Composition.—Arrow-root has been analyzed by Dr. Prout (Phil. ), and by Payen (Ann. des Scien. Nat. 2n<le Ser. Botanique, 1838, pp. 183,184), who obtained the following results:. Payen. Prout. Air-dried. Carbon 30 4 • Water 636 Dried between 200° ^2ia°/or 20 hours. 428 .., 572 ... Dried at 2120 for 0 hours longer. 444 .... 55 li Arruw-root 100-0 1000 1000 Portion mosteasili/ disaggregateddried at 212° F. Carbon 44-3 Hydrogen 02 49-5 1000 rfmidon intactpurified by al-cohol <$• water,and dried at382° 336-2549-42 100 00 The formula which agrees with Prouts third analysis is C6 FP 0°. Dr. Prout regards arrow-root as a low variety of starch, analogous to the lowsugar of honey ; while wheat-starch he considers to be the most perfect form ofstarch, analogous to sugar-candy. Commerce.—Arrow-root is brought, in tin cases and in barrels and boxes, fromthe West India Islands (Jamaica, Barbadoes, Antigua, St. Vincent, Dominica,Bermuda, St. Kitts, Grenada, Demerara and Berbice). Bermuda arroiv-root isthe most esteemed variety; whether justly or otherwise I know not. Importationsof a f
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