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 



