CONTENTS. 13 



PAGE 



mental powers to age at reproduction — Reproduction by 

 immature fathers — Illustrations from various animals. 



Relation of Mental Power to Mental Aptitude: — Power 

 is the product of long-continued conditions — Aptitude is 

 a selected part of these conditions — Mental power is the 

 basis, and mental aptitude the characteristic of eminence — 

 Mental power transmitted to the same sex, mental aptitude 

 to either sex — Illustrations. 



Sterility: — Natural and acquired sterility — Causes of 

 natural sterility — Premeditated sterility and its remedy — 

 Increase of population — The cycle of actions — The domin- 

 ating race of the future. 



Conclusion: — Evolution and degeneracy — Power of 

 controlling them — Results to be reached — Closing remarks. 



Appendix 273 



