viii 



CONTEXTS 



PAGE 



Structure of the medullary ray cells . 142 



Arrangement of the medullary ray cells in the medullary ray . . . 142 



Latex tubes 



Parenchyma 



Cortical parenchyma 147 



Pith parenchyma 147 



Leaf parenchyma 150 



Aquatic plant parenchyma 150 



Wood parenchyma 150 



Phloem parenchyma . 150 



Palisade parenchyma 150 



CHAPTER VI 

 AERATING TISSUE 



Water pores .151 



Stomata 151 



Relation of stomata to the surrounding cells 154 



Lenticels , 157 



Intercellular spaces 158 



CHAPTER VII 



SYNTHETIC TISSUE 



Photosynthetic tissue . 163 



Glandular tissue 164 



Glandular hairs 164 



Secretion cavities 166 



Schizogenous cavities . 168 



Lysigenous cavities 168 



Schizo-lysigenous cavities 168 



CHAPTER VIII 



STORAGE TISSUE 



Storage cells 173 



Storage cavities . . . .1 . . . . 176 



Crystal cavities 176 



Mucilage cavities .176 



Latex cavities 176 



Oil cavity .". . 178 



Glandular hairs as storage organs 178 



Storage walls 179 



