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 . of the leaves contain not infrequently crystals ofcarotin, or protein substances. In Scrophularia, idioblasts contain- (P); starch grains (S), being from to mm. in diameter; woodfibers (W); thick-walled medullary ray cells (M); stone cells (St). C,tangential section showing medullary ray cells (M); starch (S); wood fibers(W); stone cells (St).—Drawing by Haase. DIGITALIS 617 ing tannin extend from
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 . of the leaves contain not infrequently crystals ofcarotin, or protein substances. In Scrophularia, idioblasts contain- (P); starch grains (S), being from to mm. in diameter; woodfibers (W); thick-walled medullary ray cells (M); stone cells (St). C,tangential section showing medullary ray cells (M); starch (S); wood fibers(W); stone cells (St).—Drawing by Haase. DIGITALIS 617 ing tannin extend from the epidermal layers to the fibrovascularbundles. Digitalis.—Fox Glove.—The leaves of Digitalis purpurea(Fam. Scrophulariacese), a biennial herb (Figs. 270, 271, 272 and 274)in various parts of Europe, and the western United States and Canada,also extensively cultivated. The leaves are collected throughout thesummer from July to September, during the flowering of the plant,the best product being gathered in June prior to the expansion of theflowers. The leaves are carefully dried in the shade (preferably withthe leaves on the stem as in the drying of tobacco), and stored so. Fig. 270.—Digitalis purpurea: Leaf variations in different plants. It will benoted that the leaves vary in shapes, margins and character of the is also considerable difference in the color of the leaves and theirsurfaces. These variations seem too great and diversified to be explainedas individual variabilities.—After Miller, Amer. Jour. Pharm., 1913, p. 300. probably indigenous to central and southern Europe, and naturalizedthat they will not become moulded. While ordinarily the leaves ofthe second years plant are only collected, the leaves of the first yearseem to be more active. It has also been considered that theleaves from cultivated plants are superior to those from wild plants,but this is probably due to the more careful drying and storing of theformer. The most active digi
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