TABLE OF CONTENTS. XI 



NINTH CHAPTER. 



THEIR MEANS FOR THE CONSERVATION OF THE SPECIES. 



PAGE 



Sexual Instinct, 291 ..... 513 



I. The Copulative impulse, 292 . . . . 513 



II. Affection for their young, 293 299 . . 515 



THIRD SUBSECTION. RELATIONS OF INSECTS TO 

 THE EXTERNAL WORLD. 



Compass of this relation, 300 . . . 537 



TENTH CHAPTER. 



IN RELATION TO OTHER ORGANIC BEINGS. 



To Plants, 301306 . 538 



To Insects, 307 . 552 



To Birds, 308 . . . 554 



To Mammalia, 309 . . 556 



To Man, 310 . . . 558 



ELEVENTH CHAPTER. 



Relation to the Elements and Seasons, 311 313 . 565 



TWELFTH CH.4PTER. 



Relation to the Antediluvian World, 314317 574 



FOURTH SECTION. TAXONOMY. 



FIRST CHAPTER. 



General ideas Nature of Artificial and Natural Divisions, 318321 582 



I. Idea of Species, 322324 . . 588 



II. Idea of a Genus, 325331 . 590 



III. Idea of the Higher Groups, 332336 . 594 



