Scientific and applied pharmacognosy intended for the use of students in pharmacy, as a hand book for pharmacists, and as a reference book for food and drug analysts and pharmacologists . Fig. 273.—Transverse section of digitalis leaf, through one of the veins: UE,upper epidermis; P, chlorenchyma (mesophyll), containing chloroplastids;LE, lower epidermis; G, glandular hairs; N, non-glandular hairs; C, collen-chyma; T, tracheae or vessels; S, leptome or sieve. seous, acrid taste; a volatile principle, antirrhinic acid, somewhatresembling valerianic acid; digitalic acid, separating in white need
Scientific and applied pharmacognosy intended for the use of students in pharmacy, as a hand book for pharmacists, and as a reference book for food and drug analysts and pharmacologists . Fig. 273.—Transverse section of digitalis leaf, through one of the veins: UE,upper epidermis; P, chlorenchyma (mesophyll), containing chloroplastids;LE, lower epidermis; G, glandular hairs; N, non-glandular hairs; C, collen-chyma; T, tracheae or vessels; S, leptome or sieve. seous, acrid taste; a volatile principle, antirrhinic acid, somewhatresembling valerianic acid; digitalic acid, separating in white needles;two coloring principles, one red and the other yellow, resemblingchrysophan, a glucoside found in rhubarb; an oxydase ferment whichoccurs in the recently dried leaves; a small quantity of tannic acid; 622 SCIENTIFIC AND APPLIED PHARMACOGNOSY and ash 10 to 16 per cent (consult Merck, Amer. Jour. Pharm., 1913,p. 36). Digitoxin (Fig. 277) is a most powerful heart stimulant and yieldson hydrolysis digitoxose and digitoxigenin. It occurs in white,. Fig. 274.—Digitalis: A, a, typical leaf showing the winged or laminate petioleand the veins of the first order which diverge from the mid-vein at veryacute angles. B, transverse section of portion of leaf showing the separatedor additional epidermal layer (S); epidermal layer (E); glandular hair (G);non-glandular hair (N); collenchyma (C). C, transverse section near oneof the veins showing considerable of the separated or extra epidermal layer(S); with two non-glandular hairs (AT) and glandular hair (G); epidermallayer (E); lower epidermis (LE); chlorophyl layer (N); upper epidermis(JJE); tracheae or vessels (T). needle-shaped crystals which are insoluble in water, but more or lesssoluble in alcohol, of a bitter taste and colored deep green with DIGITOXIN 623 hydrochloric acid. According to Schmiedeberg and Kiliana digi-toxin is a chemically uniform substance being present in the leaves,but not in the seeds. Digitoxin (solubile) C
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920
