PLATE 84 



Solitary Crystals 



1. Coca leaf (Erythroxylon coca, Lamarck). 



2. Xanthoxylum bark {Zanthoxylum americanutn, Miller). 



3. Elm bark (Ulmus fulva, Michaux). 



4. Spanish licorice root (Glycyrrhiza glabra, L.). 



5. White oak bark (Quercus alba, L.). 



