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 yields 

 on hydrolysis digitoxose and digit oxigenin. It occurs in white, 



FIG. 274. Digitalis: A, a typical leaf showing the winged or laminate petiole 

 and the veins of the first order which diverge from the mid-vein at very 

 acute angles. B, transverse section of portion of leaf showing the separated 

 or additional epidermal layer (S) ; epidermal layer (E) ; glandular hair (G) ; 

 non-glandular hair (N); collenchyma (C). C, transverse section near one 

 of the veins showing considerable of the separated or extra epidermal layer 

 (S); with two non-glandular hairs (N) and glandular hair (G); epidermal 

 layer (E); lower epidermis (LE); chlorophyl layer (N); upper epidermis 

 (UE); tracheae or vessels (T). 



needle-shaped crystals which are insoluble in water, but more or less 

 soluble in alcohol, of a bitter taste and colored deep green with 



