CONTENTS. IX 



CHAPTER VI. — OF THE FOOD AND NUTRITION OF 



PLANTS 177 



Sect. I. The General Physiology of Vegetation . 177 



Sect. II. The Food and the Elementary Composition 



•" OF Plants 179 



The Organic Constituents . . . . . ' , 180 

 The Inorganic or Earthy Constituents . . . .186 



Sect. III. Assimilation, or Vegetable Digestion, and 



its Results 190 



Process and Results of Assimilation . . . ... 191 



Effect on the Atmosphere . . . . . . 199 



Relations of the Vegetable to the Animal and Mineral Kinir- 



doms 201 



CHAPTER VII. — OF FLOWERING 204 



Flowerinfj an Exhaustive Process ..... 204 



Evolution of Heat ....... 206 



Plants need a Season of Rest . . . . . .207 



CHAPTER A^UL — OF THE INFLORESCENCE . . 209 



Indefinite or Indeterminate Inflorescence . . . ,210 



Definite or Determinate Inflorescence . . . . 217 



CHAPTER IX. — OF THE FLOWER 221 



Sect. I. Its Organs, or Component Parts . . . 221 



Sect. II. Its Theoretical Structure or Morphology 224 



Sect. III. Its Symmetry 232 



Alternation of the Floral Orcans ..... 235 



Position as Respects the Axis and Bract . . . . 237 



Sect. IV. The Various Modifications of the Flower 238 



Augmentation of the Floral Circles 242 



Chorisis or Deduplication . . . . . . .243 



