i CONTENTS. 



PART II, 



NUTRITION IN PLANTS AND ANIMALS. 



CHAPTER Y. 



ON THE ABSORPTION AND CIRCULATION OF FOOD IN PLANTS 



AND ANIMALS, --------85 



CHAPTER VI. 



ON THE NlJTRITIYE PROCESSES OF RESPIRATION AND AsSIM- 



1LATION, ________ 104 



PART 111. 



REPRODUCTION 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 OF RE- 

 PRODUCTION, ----____ 135 



PART IV. 



ON THE GEOGRAPHICAL DISTRIBUTION 0? PLANTS 

 AND ANIMALS. 



CHAPTER IX. 



ON THE LAWS, ACCORDING TO WHICH PLANTS AND ANIMALS 



ARE DISTRIBUTED ON THE SURFACE OF THE GLOBE, - 153 



CHAPTER X. 



ON THE GEOLOGICAL SUCCESSION OF PLANTS AND ANIMALS, 



OR THEIR DISTRIBUTION IN TIME, - -168 



