PLATE 85 



o 



o o 



a 







C3 



Solitary Crystals 



1. India senna {Cassia angustifolia, Vahl,). 



2. Cascara sagrada bark {Rhamnus purshiana, D. C). 



3. Frangula bark {Rhamnus f ran gula, L.). 



4. White pine bark {Pinus strobus, L.). 



5. Tamarac bark {Larix laricina [Du Roi], Koch). 



