. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). THE VOLATILE PAET OF PLANTS. 71 In 100 parts, Arabic acid contains : Carbon Hydrogen Oxygen By exposure to a temperatnre of 250°, Arabic acid loses one molecule of water, and becomes insoluble in water, being transformed into Metarabic Acid, (Freniy's Acide metagummique). Cerasin.—The gum which frequently forms glassy masses on the bark of cherry, plum, apricot, peach, and almond trees, is a mixture in v
. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). THE VOLATILE PAET OF PLANTS. 71 In 100 parts, Arabic acid contains : Carbon Hydrogen Oxygen By exposure to a temperatnre of 250°, Arabic acid loses one molecule of water, and becomes insoluble in water, being transformed into Metarabic Acid, (Freniy's Acide metagummique). Cerasin.—The gum which frequently forms glassy masses on the bark of cherry, plum, apricot, peach, and almond trees, is a mixture in variable j)roportions of Arabin, or the arabates of lime and potash, with cerasin, or the metarabates of lime and potash. Cold water dis- solves the former, while the cerasin remains undissolved, but swollen to a pasty mass or jelly. Meta,i*al>ic Acid is prepared, as above stated, by exposing Arabic acid to a temperature of 230° F., and its composition is Cu Hjo Oio. It is likewise produced by putting solution of gum Arabic in contact with oil of vitriol. On the other hand, metarabic acid is converted into Arabic acid, by boiling with water and a little lime or alltali. Metarabie acid, as well as its componuds with lime, potash, etc., are insoluble in water. Bassorin, Cj„ H^, 0„, as found in Gum Tragacanth, has much similarity to metarabie acid in its properties, being insoluble in water, but swelling up in it to a paste or jelly. Vegetable Mucilage, Cj,H,„ 0,„ has the same composition, and near- ly the same characters as Bassorin, and is j)ossibly identical with it. It is an almost universal constituent of plants. It is procured in a state of purity by soak- ing unlDroken flaxseed in cold water, with frequent agitation, beating the liquid to boiling, straining, and evaporating, until addition of alcohol separates tenacious threads from it. It is tlien precipitated by alcohol contiiining a little clilorhydric -"'S- l'^- acid, and washed by the same mixture. O
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectagricul, bookyear1868
