xii CONTENTS 



CHAPTER XV 



PAGE 

 THE FACTORS WHICH DBTEKMINE SEX ....•• 623 



i. 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 FertiUsation. — iii. Theories which limit Sex- 

 determination to no particular period of development, or 

 which assert that Sex may be established at different periods — 

 Hermaphroditism and Sexual Latency — General Conclusions. 



CHAPTER XVI 



PHASES IN THE LIFE OE THE INDIVIDUAL THE DUllATIO]Sr OF LIFE 



AND THE CAUSE OF DEATH 659 



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. 



INDEX . . . 689 



