THE JOURNAL OF PHARMACOLOGY. 



Microscopical eharacteristics of Powdered Hyoscyamus 



and Belladonna Leaf. 



By Smith EIvY Jei^liffe, M.D., Ph.D. 



Hyoscyamus. 



Microscopically the following structures are to be distinguished : 

 parenchyma, crystals, epidermis cells, hairs and fibro-vascular elements. 



The parenchyma is thin-walled, simple and usually rich in chlorophyl, 

 often brownish in general color. Palisade cells, from the upper side only 



Hyoscyamus I,eaf in Powder.— Epi, epidermal cells with St, slomata and Gl, glandular hairs ; G, 

 glands from the tips of the hairs ; H, simple multicellular hair ; Pi, palisade tissue, rich in chloro- 

 phyl ; C, crystals of at least four shapes : V, vessels from the ribs and petioles ; these from the petioles 

 may be reticulated; B, fiber from rib ; P, pollen grains occasionally found. 



are in single rows, rarely double, and these usually are connected at their 

 lower ends to the funnel-shaped cells of the mesophyl. 



In the irregular mesophyl cells, numerous crystals "of calcium oxalate 



