PLATE Sy 



Rosette Crystals and Solitary Crystals Occurring in 



1. Cascara sagrada bark {Rhamniis purshiana, D.C.). 



2. Frangula bark (Rhamnus frangula, L.). 



3. Cundiirango bark (Marsdenia cundurango, [Triana] Nichols). 



4. Dogwood root bark (Cornus florida, L.). 



5. Pleurisy root (Asclepias tuberosa, L.). 



