PLATE 86 



Solitary Crystals 



1. Quassia (Picrcetta excelsa [Swartz.], Lindl.)- 



2. Uva-ursi leaf {Arctostaphylos uva-ursi [L.], Spring.)- 



3. Quebracho bark {Aspidosperma qtiebracho-hlanco, Schlechtendal). 



4. Wild-cherry bark {Prunus serotina, Ehrh.). 



