American journal of pharmacy . G 7 8 Perezia(Acourtia) Wrghtii, Gray.—1. Leaf (nat, size). 2. Flower head (nat. size),With bases of cut pedicels. 3. Root Q4 nat. size). 4. Root deprived of the woollycovering. 5. Floret (nat. size). 6. Corolla. 7. Akene. 8. Stamens (magnified). Am. Jour. PharmApril, 1884. Pipitzahoic Acid and Species of Perezia. 191 towards the apex. The akenes are whitish, glandular, puberulent,cylindrical, and have a pappus of copious hairs. The root of a slightly bitter and astringent taste, imparts to strongalcohol a dingy yellow tint, which by the addition of a weak soluti

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American journal of pharmacy . G 7 8 Perezia(Acourtia) Wrghtii, Gray.—1. Leaf (nat, size). 2. Flower head (nat. size),With bases of cut pedicels. 3. Root Q4 nat. size). 4. Root deprived of the woollycovering. 5. Floret (nat. size). 6. Corolla. 7. Akene. 8. Stamens (magnified). Am. Jour. PharmApril, 1884. Pipitzahoic Acid and Species of Perezia. 191 towards the apex. The akenes are whitish, glandular, puberulent,cylindrical, and have a pappus of copious hairs. The root of a slightly bitter and astringent taste, imparts to strongalcohol a dingy yellow tint, which by the addition of a weak solutionof a caustic alkali deepens to a clear deep yellow color. If a verydilute solution of sodic or potassic hydrate is carefully added, a faintand evanescent tint of impure purple color is perceptible, indicatingthe presence of small quantities of pipitzahoic acid combined withanother substance. As would be expected by the deepening of thecolor, in consequence of the addition of an alkali to the tincture, thissubstance proved

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Keywords: ., bookcentury1800, bookidamerica, booksubjectpharmacy, bookyear1835