Explanation of Plates. 

 List of Reference Letters. 



(Those not found here are explained where they occur.) 



ac. aggregate of crystals. 



c. cambial zone. 



Gp. cortical parenchyma. 



cr. crystals. 



c.y. crystal-bearing sclerenchymatous element. 



en. cuticle. 



(///(. diaphragm. 



e. endodermis. 



ell. epidermal hair. 



ej). epidemnis. 



es. elongated sclerenchymatous cells. 



If. guard cells, 



h)>. hypoderma. 



/. intercellular space. 



U. jinner limit of xylem. 



/,•. cork. 



;//. cells constituting medullary ray. 



)ii(L pith. 



vip. passage containing mucilage. 



inf)' . passage containing mucilage in process of formation. 



p. parenchymatous cells. 



pc. pericambium. 



j)]i. phloem. 



pin. cell constituting phloem ray. 



re. sac or reservoir containing crystals. 



rn. sac or resei'Aoir containing oily oi- resinous substance. 



s. stone-cells or scleroblasts. 



