Chapter III: Part II: Sexual Selection

CHAPTER VIII. — PRINCIPLES OF SEXUAL SELECTION. CHAPTER IX. — SECONDARY SEXUAL CHARACTERS IN THE LOWER CLASSES OF THE ANIMAL KINGDOM. CHAPTER X. — SECONDARY SEXUAL CHARACTERS OF INSECTS. CHAPTER XI. — INSECTS, continued. CHAPTER XII. — SECONDARY SEXUAL CHARACTERS OF FISHES, AMPHIBIANS, AND REPTILES. CHAPTER XIII. — SECONDARY SEXUAL CHARACTERS OF BIRDS. CHAPTER XIV. — BIRDS—continued. CHAPTER XV. — Birds—continued. CHAPTER XVI. — BIRDS—concluded. CHAPTER XVII. — SECONDARY SEXUAL CHARACTERS OF MAMMALS. CHAPTER XVIII. — SECONDARY SEXUAL CHARACTERS OF MAMMALS, continued.