CONTENTS xi 



CHAPTER XII 



PAGE 



THE INXERVATION OF THE FEMALE GENERATIVE ORGAN'S UTERINE CON- 

 TRACTION PARTURITION THE PUERPERAL STATE ... 560 



The Innervation of the External Generative Organs The Innervation 

 of the Ovaries The Innervation of the Uterus and Vagina and the 

 Mechanism of Uterine Contraction The Normal Course of Parturi- 

 tion in the Human Female Parturition in other Mammalia The 

 Nervous Mechanism of Parturition Changes in the Maternal 

 Organism The Cause of Birth Prolonged Gestation The 

 Puerperium. 



CHAPTER XIII 



LACTATION - 



.Structure of the Mammary Glands The Composition and Properties 

 of Milk The Influence of Diet and other Factors on the Composition 

 and Yield of Milk The Duration of Lactation The Discharge of 

 Milk The Formation of the Organic Constituents of Milk The 

 Normal Growth of the Mammary Glands The Factors which are 

 concerned in the Processes of Mammary Growth and Secretion. 



CHAPTER XIV 



FERTILITY - 



Effect of Age Effects of Environment and Nutrition Effect of Pro- 

 longed Lactation Influence of the Male Parent Effect of Drugs 

 Effects of In-Breeding and Cross-Breeding Inheritance of Fertility 

 Certain Causes of Sterility Artificial Insemination as a Means 

 of overcoming Sterility Abortion The Increase of Fertility, a 

 Problem of Practical Breeding The Birth-rate in Man. 



CHAPTER XV 



THE FACTORS WHICH DETERMINE SEX 661 



( 1 ) Theories which assume that Sex-determination takes place subsequently 

 to Fertilisation (2) Theories which assume that Sex-determination 

 takes place at the time of Fertilisation or previously to Fertilisation 

 (3) Theories which limit Sex-determination to no particular perit>d 

 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 OF DEATH - - 701 



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 OF SUBJECTS 729 



INDEX OF AUTHORS - - - 759 



