Vlll 



CONTENTS 



CHAPTER VI. 



THE INTERNAL SECRETIONS OF THE ORGANS OF REPRO 



DUCTION 



Castration in Males .... 



The Internal Secretion of the Testis 



Ovariotomy 



The Internal Secretions of the Ovary 

 The Gonads and Rejuvenation . 



General Conclusions 



86 

 87 

 91 

 94 

 98 

 111 

 113 



CHAPTER VII. 



HEREDITY AND SEX 



The Inheritance of Acquired Characters 



Telegony and Saturation . 



Xenia .... 



Maternal Impressions 



Prepotency 



The DETERivnNATioN of Sex 



115 

 119 

 121 

 122 

 122 

 123 

 123 



CHAPTER VIII. 



FERTILITY 137 



Effects of Environment and Nutrition .... 137 



FcETAL Atrophy . . . . . . . . .138 



vltamines and fertility . . . . . . .139 



Reduced Fertility as a Result of Inbreeding . . 140 



Cross Sterility between Species ..... 141 



Multiple Births ........ 142 



Inheritance of Fertility ....... 142 



Artificial Insemination . . . . • . .143 



Other Causes of Sterility ...... 144 



Abortion .... ...... 145 



Rate of Propagation ....... 146 



The Birth-Rate in Man 146 



GENERAL INDEX 151 



