iv CONTENTS. 



PAGE. 



ANIMAL-LIFE . . 265 



FORMATION . . 279 



ASSIMILATION . . . 297 



GENERATION . . . . . 327 



EARTH-LIFE 361 



FORMATION 373 



ASSIMILATION 381 



GENERATION 389 



PART THIRD THE HISTORICAL BIOCOSMOS 402 



DARWIN'S BIOGRAPHY ... 429 



BEFORE DARWIN AND AFTER . . 430 



RETROSPECT AND PROSPECT 450 



