xii CONTENTS 



CHAPTEB XV 



THE TACTOBS WHICH DETEBMINB SEX 



PAGE 



623 



Theories which assume that Sex-determination takes place 

 subsequently to Fertilisation. — ii. Theories which assume that 

 Sex-determination takes place at the time of Fertilisation or 

 previously to Fertilisation.— iii. Theories which limit Sex- 

 determination to no particular period of development, or 

 which assert that Sex may be established at difEerent periods — 

 Hermaphroditism and Sexual Latency — General Conclusions. 



CHAPTER XVI 



PHASES IN THE LIFE OT THE INDIVIDUAIi THE DtTBATION OP LIFE 



AND THE CAtrSE OT DEATH ....... 



Growth of the Body before Birth — Growth of the Body after 

 Birth — Puberty — ^The Menopause — Senescence — The Duration 

 of Life and the Cause of Death. 



659 



689 



