SIMPLE POWDERED VEGETABLE DRUGS 131 



Crystals largely in clusters Aloes 



Crystals generally not in clusters Gambir 



. . . No crystal formation 



Colorless mucilaginous solution Acacia 



Brownish solution 



Reddish brown solution. Bacteria present Kino 



Dull brown particles present. Musk odor Mochus 



. Not soluble in water or only slightly so 



. . . Does not emulsify in water. Abundant crystals Balsam Tolu 



. . . Emulsifies in water. No crystals present 



White emulsion. Numerous globules and bacteroid granules 



Globules numerous, mostly irregular in form Asaf cetida 



Globules fewer, mostly regular in form Ammoniacum 



Yellowish emulsion Cambogia 



. .-. . .Brown granular emulsion, no globules Opium and Lactucarium 



. . . Does not emulsify in water 



Soluble in alcohol 



, Powdered fragments showing conchoidal fracture in water mounts 



Fragments colorless Resina and Dammara 



Fragments colored 



Brownish coloration (fresh) Guaiac resin 



Greenish coloration (old) Guaiac resin 



Fragments granular in water mounts 



, . ' Crystals (benzoic acid) on sublimation Benzoin 



No crystals on sublimation Myrrh 



Not soluble in water or alcohol 



. . Chitinous spicules present. Animal odor 



.... Spicules colorless, longer Cantharis 



.... Spicules black, shorter Mylabris 



. . Spicules wanting 



.... Colors saliva red Coccus 



. . Musk odor. . . . Mochus 



