CONTENTS vii 



V. Genera 169 



VI. Species 171 



VII. Other Natural Divisions among Animals 179 



VIII. Successive Development of Characters 182 



IX. The Categories of Analogy 187 



X. Conclusions 194 



CHAPTER III. NOTICE OF THE PRINCIPAL SYSTEMS OF 

 ZOOLOGY 



Section I. General Remarks upon Modern Systems 197 



II. Early Attempts to Classify Animals 208 



III. Period of Linnaeus 210 



IV. Period of Cuvier and Anatomical Systems 215 

 V. Physiophilosophical Systems 235 



VI. Embryological Systems 245 



INDEX 



261 



