PLATE 86 
SOLITARY CRYSTALS 
. Quassia (Picrena excelsa [Swartz.], Lindl.). 
. Uva-ursi leaf (Arctostaphylos uva-ursi [L.], Spring.). 
. Quebracho bark (A spidosperma quebracho-blanco, Schlechtendal). 
. Wild-cherry bark (Prunus serotina, Ehrh.). 
+ ® N & 
