American journal of pharmacy . aporate spontaneously. This left a sticky,yellow extractive, overlaying a fixed oil; these were separated. Theoil has a fine yellow color, a bland taste and the odor of the sticky extract was washed with water and then exhausted withwarm 95 per cent, alcohol. This alcoholic solution was concentratedwith a low heat and set aside. Upon cooling, yellow, wart-like crys-tals formed. By numerous solutions and recrystallizations in alcoholthese were obtained white. They are wart-like, odorless and tasteless, 28 434 Asclepias Cornuti. f Am. Jour Sept., 1
American journal of pharmacy . aporate spontaneously. This left a sticky,yellow extractive, overlaying a fixed oil; these were separated. Theoil has a fine yellow color, a bland taste and the odor of the sticky extract was washed with water and then exhausted withwarm 95 per cent, alcohol. This alcoholic solution was concentratedwith a low heat and set aside. Upon cooling, yellow, wart-like crys-tals formed. By numerous solutions and recrystallizations in alcoholthese were obtained white. They are wart-like, odorless and tasteless, 28 434 Asclepias Cornuti. f Am. Jour Sept., 1881. iridescent in the sunliglit, volatilized at a low heat, leaving no residue,have no reaction on litnuis paper, are very soluble in chloroform, sol-uble in benzin, ether and alcohol, insoluble in water. In contact withstrong sulphuric acid and bichromate of potassium they give a greencolor. With strong sulphuric acid and chlorinated lime they give atfirst a brown color, but on standing a short time this turns to a purple. 2. Asclepias Cornuti.—1, Portion of rhizome. 2, Transverse section,natural size. 3, Transverse section, magnified. 4, Bast , Lactieiferous vessel, G, Starch granules. These crystals may also be obtained by exhausting the sticky benzinextract with ether, but on account of the fatty matter which ethertakes up it is difficult to obtain them pure. Another, and probablythe best method, is to percolate the drug directly with alcohol, concen-trating the tincture and setting aside that crystals may form. Thevellow crystals thus obtained are best purified by dissolving in a mix-ture of chloroform and alcohol, shaking with animal charcoal, filteringand setting aside for spontaneous evaporation, washing with dilutedalcohol and drying in a cool place. In all three of the above methodsit is important that the least possible amount of heat should be used. The benzin extract, after having been exhausted Avith alcohol, ether,water and dilute hydrochloric acid, con
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Keywords: ., bookcentury1800, bookdecade183, booksubjectpharmacy, bookyear1835
