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PLATE 85 
poy lag 
SOLITARY CRYSTALS 
1. India senna (Cassia angustifolia, Vahl.). 
2. Cascara sagrada bark (Rhamnus purshiana, D. C.). 
3. Frangula bark (Rhamnus frangula, L.). 
4. White pine bark (Pinus strobus, L.). 
5. Tamarac bark (Larix laricina [Du Roi], Koch). 
