Contents 



CHAPTER VII 



PAGE 



Regeneration . . . . . . .153 



CHAPTER VIII 



Determination of Sex, Secondary Sexual 

 Characters, and Sexual Instincts: 



I. — The Cytological Basis of Sex Deter- 

 mination . . . . . . 198 



II. — The Physiological Basis of Sex De- 

 termination . . . . . .214 



CHAPTER IX 

 Mendelian Heredity and its Mechanism . .229 



CHAPTER X 



Animal Instincts and Tropisms . . . 253 



chapter XI 

 The Influence of Environment . . .286 



chapter XII 



Adaptation to Environment . . . .318 



chapter xiii 

 Evolution . -346 



CHAPTER XIV 



Death and Dissolution of the Organism . 349 



Index ... . . . . . . 371 



