PLATE 87 



ROSETTE CRYSTALS AND SOLITARY CRYSTALS OCCURRING IN 



1. Cascara sagrada bark (Rhamnus purshiana, D.C.). 



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



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



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



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



