X1 i CONTENTS. 



PAOK 



PBOSENCHYMA 76 



Prosenchyraa proper 77 



Woody Fibres 



Tracheids 



Tracheae, or Ducts 84 



Liber-fibres 87 



CRIBROSE-CELLS 91 



LATEX-CELLS 94 



Eeceptacles for Secretions 97 



Intercellular Spaces 99 



CHAPTER III. 



MINUTE STRUCTURE AND DEVELOPMENT OF THE ROOT, 

 STEM, AND LEAF OF PILENOGAMOUS PLANTS. 



The Systems of Tissues . . ' 102 



Structure of a Fibro-vascular Bundle 103 



THE ROOT 106 



Primary Structure 106 



The Root-cap .107 



The Piliferous Layer 108 



The Central Cylinder 110 



Secondary Structure 112 



THE STEM . ! 118 



Primary Structure 119 



The Epidermis t 119 



Primary Cortex 119 



Primary Bundles < 120 



Pith 



11M 



Medullary Rays 12 4 



Course of the Bundles .126 



Secondary Structure ! 136 



Of Monocotyledons 



Of Dicotyledons 



Changes by Growth 



Anomalous Stems ,00 



Spring and Autumn Wood 



Annual Layers 



Color of Wood ] 



Preservation of Wood . 



Density 



Bark 



Secondary Liber . . . 



cork ; ; ; 



Injuries of the Stem .... 

 Lenticels . . . 



*" '.'.::' 



