4 CONTENTS. 



PAGE 



Chapter XVIII. Instinct {continued). 



Cases of Special Difficulty with Regard to the 

 Foregoing Theory of the Origiu aud Develop- 

 ment of instincts 



XIX. Reason 



Ai'pen: 



273 



318 



XX. Animal Emotions, and Summary of Intel- 

 lectual Faculties '^'^'■ 



353 



