The organic constituents of plants and vegetable substances and their chemical analysis / by G.C. Wittstein ; authorised translation from the German original, enlarged with numerous additions, by Baron Ferd. von Mueller.

Georg Christian Wittstein

Date:: 1878

Credit: The organic constituents of plants and vegetable substances and their chemical analysis / by G.C. Wittstein ; authorised translation from the German original, enlarged with numerous additions, by Baron Ferd. von Mueller. Source: Wellcome Collection.

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$afterwards bitter and acrid taste; dissolves in water and alcohol, not in ether; froths with water, gives precipitates \\ith acetate and snb-acetate of lead. Separates, by boiling with diluted acids, into sugar and a white substance, insoluble in water.—Baron F. von Mueller and L. Rummel.] Pityxyloilic Acid =025 H20 Og. In the stem of Pinus sylvestris, probably also in Pinus Abies and other species. Boil the finely rasped wood with water, strain, evaporate the liquid mixed with carbonate of baryta to a small hulk, filter, evaporate again and treat the remnant with ether. Digest the exhausted mass with alcohol, which dissolves the P. acid, and leaves it after evaporation.—Brown-yellow, amorphous, hygroscopic mass, very bitter, of acid reaction; dissolves slowly in cold, readily in boiling water with pale-yellow colour, readily in alkaline water. Pluillliao'ill. Acrid, crystalline ingredient of Plumbago Europaja. Draw out the bark of the root with ether, evaporate the liquid, boil the exti-act with water and purify the Plumbagin, which will have subsided on cooling from the decoction, by recrystallising in ether or in ether-alcohol.—Crystallises in delicate, orange-yellow, tuftily-vmited needles, tastes at first sweetish, irritating, afterwards burning and acrid, fuses readily, volatilizes paii^ly unaltered, is of neutral reaction, dissolves sparingly in cold, more in hot water, readily in alcohol and in ether. Sulphuric and nitric acids dissolve it with yellow colour, ammonia with red colour, and acids restore the yellow colour. The aqueous solution becomes likewise coloured with sub-acetate of lead, under formation of a carmine- red precipitate. PoUeilin. The main ingredient of the pollen remains, after the pollen has been treated successively with water, alcohol, ether, diluted acids and alkalies.—Subtle, light, tasteless powder, putrifies in the moist state under evolution of ammonia. Is most likely not quite pure in this state, and perhaps in the main cellulose. Poly chroit=Crocin. Polygalm=Saponin. [Polyg'Onic acid. Prepared by Rademaker from the herb of Polygonum hydropiper, by exhausting with dilute alcohol, evapo- rating to one-third, filtering and precipitating the filtrate by acetate of lead. The precipitate is well-washed, decomposed by sulphuret of hydrogen and the filtrate treated with ether, which dissolves the P. acid, and leaves it behind on evaporation.—Green, deliquescent, crystals of an acrid, bitter taste, and strongly acid reaction, soluble in alcohol, ether and chloroform, less so in aqueous alcohol; neutralise the bases completely, forming well- defined salts.]$