American journal of pharmacy . tes. This solution was divided into four Am. Jour. 18!ts. / S/)icirs of Covimclina. 331 portions, and tested iox alkaloids with Mayers rea<^ent, picric acid,potassium tri-iodide and phosphotungstic acid. All of these reagentsgave small, flocculent precipitates, but they may have been due toalbuminous matter, and not to alkaloids. Another special searchwas made for alkaloids by macerating 12 grammes of fresh plant(dried) with alcohol of -820 specific gravity for several days. Thealcoholic liquid was strained off, filtered clear, and then evaporated
American journal of pharmacy . tes. This solution was divided into four Am. Jour. 18!ts. / S/)icirs of Covimclina. 331 portions, and tested iox alkaloids with Mayers rea<^ent, picric acid,potassium tri-iodide and phosphotungstic acid. All of these reagentsgave small, flocculent precipitates, but they may have been due toalbuminous matter, and not to alkaloids. Another special searchwas made for alkaloids by macerating 12 grammes of fresh plant(dried) with alcohol of -820 specific gravity for several days. Thealcoholic liquid was strained off, filtered clear, and then evaporatedto dryness on a water-bath. The residue was treated with waterpreviously acidified with diluted sulphuric acid, and the insolublematter separated by filtration. The filtrate reacted for alkaloids asfollows: phosphotungstic acid gave a large, whitish precipitate;potassium tri-iodide, Mayers reagent and gold chloride gave slightprecipitates; picric acid, tannic acid, mercuric chloride and platinicchloride gave no Fig. 7. The existence of an alkaloidal substance in the plant is an un-settled matter, as the tests for it were in no case satisfactory, partlybecause of the very small amounts of the substances yielding thetests which could be separated. Some of the last-mentioned filtrate which was tested for alkaloidswas made alkaline with potassium hydrate and warmed with Feh-lings solution, which reagent was reduced. An exactly equal volumeof the same filtrate was boiled with some diluted sulphuric acid, thenmade alkaline and treated with Fehlings solution, as in the pre-ceding case, when an increased amount of cuprous oxide was de-posited. While this action is not taken as conclusive evidence of aglycoside, still, considering it in connection with behaviors of thesame character noticed in the proximate analysis, it points to the 332 A Species of Commelina. Aut. Jour. , lw« presence of a substance allied to the ^lucosidcs. That it is notsaccharose is prov
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