Essay on classification

Frontmatter EDITOR'S INTRODUCTION (Edward Lurie, page ix) A NOTE ON THE TEXT (page xxxiv) CHAPTER I. THE FUNDAMENTAL RELATIONS OF ANIMALS TO ONE ANOTHER AND TO THE WORLD IN WHICH THEY LIVE AS THE BASIS OF THE NATURAL SYSTEM OF ANIMALS (page 3) CHAPTER II. LEADING GROUPS OF THE EXISTING SYSTEMS OF ANIMALS (page 139) CHAPTER III. NOTICE OF THE PRINCIPAL SYSTEMS OF ZOOLOGY (page 197) INDEX (page 261)