CONTENTS 



OF THE FIRST VOLUME. 



INTRODUCTION. 



Page 



Chapter I. — Final Causes 1 



II. — The Functions of Life 28 



PART I.— THE MECHANICAL FUNCTIONS. 



Chapter I. — Organic Mechanism 50 



§ 1 . Organization in general 50 



2. Vegetable Organization 55 



3. Developement of Vegetables 72 



4. Animal Organization 83 



5. Muscular Power 112 



Chapter II. — The Mechanical Functions in Zoophytes 131 



§ 1 . General Observations 131 



2. Sponges 1 35 



3. Polypifera 146 



4. Infusoria 1 66 



5. Acalephae 175 



6. Echinodermata 181 



Chapter III. — Mollusca 193 



§ 1 . Mollusca in general 193 



2. Acepbala 195 



3. Gasteropoda 204 



4. Structure and formation of the Shells of Mollusca 206 



5. Pteropoda 230 



6. Cephalopoda 231 



Chapter IV,— Articulata 240 



§ 1. Articulated animals in general 240 



2. Annelida 242 



3. Arachnida 252 



4. Crustacea 257 



