CONTENTS. Vii 



Page 



CHAPTER VEIL COMPARATIVE PHYSIOLOGY OF THE NERVOUS SYSTEM 378 



1. Nervous System of Invertebrated Animals - - 378 



2. Nervous System of Vertebrated Animals - - 388 



3. Functions of the Brain .... 395 



4. Comparative Physiology of Perception - - - 398 



PART IV. THE REPRODUCTIVE FUNCTIONS. 



CHAPTER I. REPRODUCTION .... 408 



CHAPTER II. ORGANIC DEVELOPMENT . 420 



CHAPTER ffl. DECLINE OF THE SYSTEM - . . 433 



CHAPTER IV. UNITY OP DESIGN - - - 437 



-...-... 449 



