PLATE 83 



SOLITARY CRYSTALS 



1. Cactus grandiflorus (Cerdus grandiflorus [L.], Britton and Rose). 



2. Hemlock bark (Tsuga canadensis [L.], Carr.). 



3. Krameria root (Krameria triandra, Ruiz and Pav.). 



4. Soapbark (Quittaja saponaria, Molina). 



