xii CONTENTS 



CHAPTER XV 



PAGE 

 THE FACTORS WHICH DETERMINE 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 Fertilisation. lii. 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 OF THE INDIVIDUAL THE DURATION OF LIFE 



AND THE CAUSE CF 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 



