VI CONTENTS. 



PART II. 



NUTEITION m PLANTS AND ANIMALS. 



CHAPTER V. 



On the Absorption and Cikoulation- op Food in Plants 

 AND Animals, - - 85 



CHAPTER VI. 



On the Nutritive Processes op Respiration and Assim- 

 ilation, . < . 104 



PART III. 



BEPBODUCTION IN PLANTS AND ANIMALS. 



CHAPTER VII. 



General Considerations on- Reproduction in Plants 

 AND Animals, . 123 



Hybridization, - 131 



CHAPTER VIII. 



On the Essential and Consecutive Phenomena op Re- 

 production, - 135 



PART IV. 



ON THE GEOGRAPHICAL DISTRIBUTION OP PLANTS 

 AND ANIMALS. 



CHAPTER IX. 



On the latvs, according to "which Plants and Animals 

 ARE Distributed on the Surface op the Globe, 153 



CHAPTER X. 



On the Geological Succession op Plants and Animals, 



or their Distribution in Time, 168 



1* 



