CONTENTS. 



CHAPTER I. 



GENERAL SKETCH OF THE EARLY PROGRESS IN NATURAL 



CHAPTER II. 



NOMENCLATURE AND CLASSIFICATION . , . . 16 



CHAPTER III. 



CATEGORIES OF CLASSIFICATION . . . . .30 



CHAPTER IV. 



CLASSIFICATION AND CREATION . . . . .41 



CHAPTER V. 



DIFFERENT VIEWS RESPECTING ORDERS 72 



CHAPTER VI. 



GRADATION AMONG ANIMALS 84 



CHAPTER VII. 



ANALOGOUS TYPES . . 108 



CHAPTER VIII. 



FAMILY CHARACTERISTICS . . . . . . 109 



