512 



PbWDERED DRUGS 



TYPES OF DRUG POWDERS 



The following pages (512-519) are illustrations of some of the more 

 important drug powders of the National Formulary and of the Phar- 

 macopoeia, designed to illustrate how characteristic elements may be 

 selected for purposes of microscopical identification. 



On pages 520-528 will be found condensed descriptions of the 

 characteristic elements of some of the more important drug powders 

 selected mainly to give as wide a range as possible for purposes of 

 identification. 



FIG. 293. Powdered Stramonium. (X 183.) A, Epidermis, surface view. B, Transverse 

 section of leaf. C, Aggregate crystals of calcium oxalate. D, Non-glandular tnchomes. t,, 

 Glandular tricomes. F, Pollen grains. G, Water tubes. H, Mesophyll cell, containing sphenoidal 

 crystals of calcium oxalate. I, Palisade parenchyma, surface view. 



