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PLATE 32 
Porous AND STRIATED STONE CELLS 
. Ruellia root (Ruellia ciliosa, Pursh.). 
. Winter’s-bark (Drimys winteri, Forst.). 
. Bitterroot (A pocynum androsemifolium, L.). 
. Allspice (Pimenta officinalis, Lindl.). 
. Aconite (Aconitum napellus, L.). 
