CONTENTS. 



PREFACE . 



LIST OF WOODCUTS 



CHAPTER I. 

 The NAT0EAL fliSTOEY OF THE Common CKAYEisfi . . . 1 



CHAPTER II. 



The Petsiologt of the Common Ceayfish. The Mechanism 



BY WHICH THE PAKTS OP THE LIVING ENGINE AKE SUPPLIJ.t/ 

 WITH THE MATEEIAtS NECESSAEY FOE THEIB MAINTENANCE 

 AND GEOWTH 44 



CHAPTER III. 



The Physiology of the Common Ceayfish. The Mechanism 

 BY which the Living Oeganism adjusts itself to sue- 



EOUNDING conditions AND EEPEODtJOBS ITSELF ... 87 



CHAPTER IV. 

 Tde Moephology of the Common Ceatfish. The steuctuke 



AND THE development OF THE INDIVIDUAL . . . . 137 



