CONTENTS. 13 



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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 



