CONTENTS ix 



PAGE 



Absorption of Gases 115 



Stomata 115 



Respiration 117 



Transpiration . . . 118 



Lenticels 119 



CHAPTER X 

 CONDUCTING TISSUES 



General Considerations , 120 



Ducts 120 



Types of Ducts 121 



Tracheids 122 



Sieve Tubes 122 



Sieve Plates 122 



Medullary Rays 124 



Latex Tubes 126 



Porous Parenchyma 127 



Fibro-vascular Tissues 127 



Types of Fibro-vascular Bundles 127 



CHAPTER XI 

 TISSUES FOR SYNTHESIS, ASSIMILATION AND STORAGE 



General Considerations 132 



Photosynthesis 132 



Formation of Starch 132 



Assimilation, Soluble and Reserve Starch 134 



Formation of Inulin 135 



Formation of Aleurone and Hydrocarbons 135 



Formation of Calcium Oxalate 136 



Formation of Glucosides 136 



Secreting Cells and Cavities 136 



Glandular Hairs 137 



Secretory Cavities 137 



Unicellular Secretion Cells 139 



Vittae 140 



Storage Tissues 140 



Parenchyma 140 



Secretion Cavities 141 



Collenchyma 141 



Cavities of Stone Cells and Fibers 141 



