VIU 



CONTENTS. 



Rhizoma or Rootstock 



Tuber 



Corm ...... 



Bulbs and Bulblets . 

 Consolidated Forms of Vegetation 



106 

 107 

 108 

 109 

 110 



Sect. IV. The Internal Structure of the Stem 



111 



Sect. V. The Endogenous or Monocotyledonous Stem 114 



Sect. VI. The Exogenous or Dicotyledonous Stem 



The First Year's Growth .... 



The Wood 



The Bark 



The Cambium-Laver ..... 



Annual Increase of the Wood 



Sap-wood and Heart-wood .... 



The Bark ; its particular Structure 



The Living Parts of a Tree, &c. 



The Plant a Composite Being, Individuality 



Comparison of Endogenous with Exogenous Structure 



116 



118 

 119 

 120 

 122 

 123 

 124 

 126 

 129 

 131 

 132 



CHAPTER v. — OF THE LEAVES 133 



Sect. I. Their Arrangement 133 



Phyllotaxis 133 



Vernation or Pra^foliation . . . . . . 143 



Sect. II. Their Structure and Conformation . . 145 



Anatomy of the Leaf 145 



Stomata ..... ^ ... . 150 



Development of Leaves ....... 153 



The Venation and Forms of Leaves 1 54 



Compound Leaves 163 



Leaves of Peculiar Conformation or Transformation . . 165 



The Petiole or Leafstalk, Phyllodia, Stipules . . . 170 



Sect. IH. The Duration of Leaves ; their Action, etc. 172 



Fall of the Leaf 173 



Death of the Leaf 174 



Exhalation from the Leaves, Rise of the Sap . . . 175 



