WOODS. 



175 



PLATE LXXVIL 



100 h* pi. 



FIG. 87. Powdered Jamaica Quassia Wood (x 240) 



ccr, Crystal cells. 



ci, Prismatic or rhombohedral crystals. 



fl, Wood-fibres. 



pi, Wood parenchyma, longitudinal aspect. 



pv, Wall of vessel. 



rm, Medullary rays in tangential section. 



r'm', Medullary rays in radial section. 



tcr, Superposed crystal-cells. 



v, Portion of vessel. 



v', The same with frayed wall. 



