x 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 



