CONTENTS, 



PAQB 

 V 



PREFACE .....••• 



LIST OF WOODCUTS 



CHAPTER I. 



The ITatural Aistort of the Common CiiAYrisfl 



CHAPTER II. 



The Physiologtj: of the Common Crayfish. The Mechanism 

 BY which the Parts of the Living Engine are supplied 



WITH the materials NECESSARY FOR THEIR MAINTENANCE 

 AND GROW'IH *" 



CHAPTER III. 



The Physiology of the Common Crayfish. The Mechanism 

 BY which the Living Organism adjusts itself to sur- 

 rounding conditions and reproduces itself ... 87 



CHAPTER IV. 



The Morphology of the Common Crayfish. The structure 



AND the development OF THE INDIVIDUAL . ... 137 



