The crystals occurring in cactus grandiflorus, hemlock bark, krameria root, and soap bark are irregular polyhedrons (Plate 83). They are longer than broad, and the ends are tapering. The crystal of cactus grandiflorus has the narrowest diameter of these four, while the crystals of soap bark have the widest diameter. In coca leaf, xanthoxylum bark, elm bark, Spanish licorice, and in white oak (Plate 84), and in cocillina bark (Plate 82, Fig. 4) the crystals are all irregular polyhedrons with flat bases. They are mostly longer than broad and they are all widest in the centre; in each a few crystals are notched, but most of the crystals are not notched.
The crystals in quassia wood, uva-ursi leaf, and most of those of quebracho and wild cherry bark (Plate 86, Figs. 1, 2, 3, and 4) are irregular polyhedrons with flat ends. They are longer than broad, widest at the centre, and non-notched.
PLATE 81
Inclosed Rosette Crystals
1. Hops (Humulus lupulus, L.).
2. Bracts of cannabis indica (Cannabis sativa, variety Indica, Lamarck).
3. Medullary rays of canella alba.
4. Parenchyma cells of mandrake (Podophyllum peltatum, L.).
PLATE 82
Solitary Crystal
1. Batavia cinnamon (Cinnamomum burmanni, Nees).
2. Henbane leaves (Hyoscyamus niger, L.).
3. Morea nutgalls.
4. Cocillana bark (Guarea rusbyi [Britton], Rusby).
PLATE 83
Solitary Crystals