CONTENTS 

 OF THE FIRST VOLUME. 



INTRODUCTION. 



Page 



CHAPTER I. FINAL CAUSES 1 



II. THE FUNCTIONS OF LIFE 34 



PART I. THE MECHANICAL FUNCTIONS. 



CHAPTER I. ORGANIC MECHANISM 59 



1. Organization in general 59 



2. Vegetable Organization 65 



3. Developement of Vegetables 82 



4. Animal Organization 96 



5. Muscular Power 124 



CHAPTER II. THE MECHANICAL FUNCTIONS IN ZOO- 

 PHYTES 142 



1 . General Observations 142 



2. Porifera, or Sponges 147 



3. Polypifera 161 



4. Infusoria v 183 



5. Acalepha 192 



6. Echinodermata 199 



CHAPTER III. MOLLUSCA , 213 



1 . Mollusca in general , 213 



2. Acephala 217 



