CONTENTS. 



PACE 



PREFACE V 



LIST OF WOODCUTS xi 



CHAPTER I. 



The Natural Hi.story of the Common Ckayfish . 



CHAPTER II. 



The Physiolooy of the Common Crayfish. The Mechanism 

 BY WHICH the Parts of the Living Engine are supplied 

 with the materials necessary for their maintenance 

 and growih 46 



CHAPTER III. 



The Physiology of the Cojimon 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 sTRUCTUiiE 



AND THE DEVELOP.MENT OF THE INDIVIDUAL . . . . 137 



