NON-POISONOUS DRUGS 175 
much too much.”’ The opposite effect upon us of the same 
substance according as it acts in larger or smaller amount is 
well illustrated also in very many perfumes, and, as we shall 
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Fic. 168, I—Asafetida Plant (Ferula assa-fetida, Parsley Family, Um- 
bellifere). Plant in flower, and part of leaf. (Baillon.)—Perennial 
herb growing about 2-3 m. tall, with a milky juice of fetid odor; 
leaves bluish green; flowers pale yellow; fruit reddish brown. Native 
home, Southwestern Asia. 
more fully show, in a large proportion of medicines. Saffron 
consists of the dried stigmas of the saffron crocus (F ig. 168 II). 
It contains about 7% of a volatile oil of agreeable flavor, 
and a small amount of a deep yellow coloring matter which 
