EXPLANATION OF PLATE X 
Figs. 1-6. Cannabis wood sections. Figs. 1,3, 5 are C. indica, and 
2,4,6 are C, sativa. Fig. 1, transection showing radial chains of ves- 
sels, libriform fibres, and procumbent ray parenchyma. Fig. 2, tran- 
section showing tendency for solitary vessels, fibre dimorphism, and 
ray parenchyma shorter radially (erect). Fig. 3, transection showing 
thick walls of vessel members and libriform fibres ; note cuboidal crys- 
tals in ray cells (arrows). Fig. 4, transection showing relatively thin 
cell walls; note shrunken secondary walls of gelatinous fibres. Fig. 5, 
tangential section showing wood rays with numerous crystals; photo- 
graphed with partially polarized light. Fig. 6, tangential section 
showing relatively narrower wood rays with erect cells; crystals ab- 
sent. Figs. 1-2, 5-6, < 71. Figs. 3-4, < 308. 
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