CO]^TE]\TS 

 OF THE FIRST VOLUME. 



INTRODUCTION. 



Chapter I. — Final Causes . . . . . .17 



II. — The Functions of Life .... 39 



PART I.— THE MECHANICAL FUNCTIONS. 



Chapter I. — Organic Mechanism . . . . .56 



§ 1. Org-anization in general .... 56 



2. Veg-etable Org-anization . . . . .60 



3. Development of Vegetables .... 71 



4. Animal Organization . . . . .79 



5. Muscular Power . • ... 97 



Chapter II. — The Mechanical Functions in Zoophxtes . . 110 



§ 1. General Observations . . . .110 



2. Porifera, or Sponges ..... 113 



3. Polypifera ...... 122 



4. Infusoria . . . . . . .136 



5. Acalepha ...... 142 



6. Echinodermata ...... 147 



Chapter III. — Mollusc a . . . . . .157 



§ 1, Mollusca in general . . . . .157 



2. Acephala ...... 159 



3. Gasteropoda ...... 166 



4. Structure and formation of the Shells of Mollusca . 168 



5. Ptcropoda . . . . . .185 



6. Cephalapoda ...... 186 



Chapter IV. — Articulata ...... 193 



§ 1. Articulated animals in general . . . 193 



2. Annelida . . . . . . .194 



3. Arachnida ...... 202 



4. Crustacea ...... 204 



Vol. I. C 



