PLATE 85 







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). 



