ESSENCES 147 
also in the sugar-beet root, and is manufactured artificially 
from oil of cloves and from pine wood. But these artificial 
products are inferior in flavor to the natural product extracted 
from the vanilla ‘“bean.”’ 
Fic. 146, I—Peppermint (Mentha piperita, Mint Family, Labiate). 
Flowering top. (Baillon.)—A perennial herb, growing 1 m. tall, aro- 
matic; leaves bearing numerous minute volatile oil glands; flowers pale 
purplish; nutlets seldom formed. 
The oil of wintergreen is likewise manufactured artificially, 
but in this case the artificial product is indistinguishable 
from the natural one. Unlike most oils this sinks in water, 
being indeed the heaviest known of volatile oils. It is a 
