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 183 



5. Acalepha 192 



6. Echinoderraata 199 



Chapter III. — Mollusca 213 



§ 1 . Mollusca in general 213 



2. Acephala 217 



