408 POWDERED VEGETABLE DRUGS 



133. (Fig. 133.) MANNA. Manna. U. S. 



The dried sugar-like exudate of Fraxinus Ornus L., Oleacese. 



Somewhat sticky, in gummed particles. 



Somewhat yellowish, dirty color. 



Faint odor. 



Sweet taste. 



Aggregates of prismatic crystals of mannose are present which 

 gradually dissolve in water. Various impurities are quite gener- 

 ally present, among them bein gbacteria, yeasts, molds, mold spores, 

 vegetable tissue elements, moth and butterfly scales, etc. 



Ash should not exceed 2 per cent. 



Varies greatly in purity. The purer grades are less hygroscopic 

 and sticky and contain less of the impurities above mentioned. 



