x Contents. 



CHAPTER VI. 



Mm 



CHARACTERS AS HEREDITARY AND ACQUIRED (Conclusion) 150 



CHAPTER VII. 

 CHARACTERS AS ADAPTIVE AND SPECIFIC . . . .159 



CHAPTER VIII. 



CHARACTERS AS ADAPTIVE AND SPECIFIC (Continued). 



I. Climate ......... aoo 



II. Food 317 



III. Sexual Selection 319 



IV. Isolation . . . . . . . . .323 



V. Laws of Growth 336 



CHAPTER IX. 

 CHARACTERS AS ADAPTIVE AND SPECIFIC (Continued) . . 338 



CHAPTER X. 



CHARACTERS AS ADAPTIVE AND SPECIFIC (Concluded) . . 351 

 SUMMARY 374 



APPENDIX I. ON PANMIXIA 391 



APPENDIX II. ON CHARACTERS AS ADAPTIVE AND SPECIFIC . 307 



NOTE A TO PAGE 57 333 



NOTE B TO PAGE 89 337 



