12 CONTENTS. 



PAGE 



pectancy Infant mortality Puberty delayed by late re- 

 production Result of delayed puberty Races compared 

 as to puberty. Practical considerations. 



CHAPTER XVI. 

 EFFECT OF SEXUAL REPRODUCTION ^ 247 



Reproduction as temporary disuse: Functional ac- 

 tivity accompanied by waste and repair. Degrees of waste 

 and repair Functional condition due to rate of repair 

 Germ cell the epitome of the adult Divisions of germ cells 

 equivalent to a condition of waste Repair of wasted germ 

 cells Functional condition of germ cells and quality of 

 repair Habit of repairing organs Cessation of cell divi- 

 sions and repair is disuse Development and the length of 

 time between periods of disuse. 



Immaturity: Sexual excesses and rapid cell divisions 

 Immature seeds Immature germ cells and weak children 

 Offspring of parents who are still growing Brain power 

 vs. brain size The Incas. 



Inheritance at certain ages: Active and inert organs 

 differently affected Initial velocity of development Per- 

 sistence of a single advance or retrogression. 



Inheritance by sex: Relates to characters appearing 

 after puberty Secondary sexual character of late brain 

 development Transference of sexually developed charac- 

 ters to the opposite sex Due to initial velocity From 

 grandparent of one sex to grandchild of the opposite sex. 



Examples from Horses. 



CHAPTER XVII. 



MENTAL AND PHYSICAL RESULTS 257 



Secondary sexual characters and intelligence: On- 

 togeny of parent and offspring Functionally active and 

 functionally inert characters Relation of the beard and 



