CONTENTS. 



CHAPTER I. 



GENERAL SKETCH OP THE EARLY PROGRESS IN NATURAL 



CHAPTER II. 



NOMENCLATURE AND CLASSIFICATION 15 



CHAPTER III. 



CATEGORIES OF CLASSIFICATION ...... 80 



CHAPTER IV. 



CLASSIFICATION AND CREATION ...... 41 



CHAPTER V. 



DIFFERENT VIEWS RESPECTING ORDE&B . . 72 



CHAPTER VI. 



GRADATION AMONG ANIMALS ....... 84 



CHAPTER VII. 



ANALOGOUS TYPES 108 



CHAPTER VIII. 



FAMILY CHARACTERISTICS 109 



