American journal of pharmacy . Fig- 3-—^Vertical view of portion of dorsal epidermis of R. venenata cells {e); non-glandular hairs {h). sium, chlorides, phosphates and sulphates were found in the was determined by the Kjeldahl method. The presenceof nitrates and nitrites could not be found. Four extractions were carried out by the Soxhlet continuousextraction method. Each extraction extended over a period of 3days, allowing the solvent to macerate the sample during the Fig. 4.—Surface view of dorsal epidermis of R. venenata lamina showing hairs{h)\ wavy w
American journal of pharmacy . Fig- 3-—^Vertical view of portion of dorsal epidermis of R. venenata cells {e); non-glandular hairs {h). sium, chlorides, phosphates and sulphates were found in the was determined by the Kjeldahl method. The presenceof nitrates and nitrites could not be found. Four extractions were carried out by the Soxhlet continuousextraction method. Each extraction extended over a period of 3days, allowing the solvent to macerate the sample during the Fig. 4.—Surface view of dorsal epidermis of R. venenata lamina showing hairs{h)\ wavy walled epidermal cells {e)\ and stomata {5). 700 Rhus Venenata DC. ( Am. Jour. Pharm.( October, 1920. A good grade of low-boiling petroleum ether was used in the firstextraction. In this solvent ethereal and non-volatile fixed oil wasobtained, as well as a great amount of chlorophyll. On standinga white waxy-like substance separated out of the petroleum extract. By spontaneous evaporation of a portion of the petroleum ex-tract a yellowish brown, oily residue was obtained. This residue,when taken up with neutral alcohol, is neutral in reaction. The alcoholic solution of the residue was optically inactive,which Pfaff states is true of the non-volatile oil causing the derma-titis. The residue from the petroleum ether extract, when takenup with alcoholic potash solution, can be saponified. No glycerinis liberated. To confirm, practically, that the poisonous principle was ob-tained in the petroleum ethe
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Keywords: ., bookcentury1800, bookidamerica, booksubjectpharmacy, bookyear1835
