PLATE 84 



SOLITARY CRYSTALS 



1. Coca leaf (Erythroxylon coca, Lamarck). 



2. Xanthoxylum bark (Zanthoxylum americanum, Miller). 



3. Elm bark (Ulmus fulva, Michaux). 



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



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



