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. HI. Assimilation, or Vegetable Digestion, and 



its Results 190 



Process and Results of Asamilation . . . . .191 



Effect on the Atmosphere . . . . . . 199 



Relations of the Vegetable to the Animal and Mineral King- 

 doms 201 



CHAPTER Vn. — OF FLOWERING 204 



Flowering an Exhaustive Process 204 



Evolution of Heat 206 



Plants need a Season of Rest 207 



CHAPTER Vm. — 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. n. Its Theoretical Structure or Morphology 224 



Sect. IH. Its Symmetry 232 



Alternation of the Floral Organs 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 



