12 CONTEXTS. 



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 



