CONTENTS. 7 



PAGE 



the higher classes — The consequence according to Weis- 

 mann's theory — Testimony of the nineteenth century — 

 Parisian skulls. 



Deduction from the theory of use-inheritance: — Educa- 

 tion of successive generations — Testimony of Greece, Rome 

 and modern times — Revival of learning — Eminent men in 

 different centuries — Fig. i — One hundred great men — 

 England and Scotland — United States — Inventions an index 

 to mental power. 



Comparison of Deductions: — Objections to the evi- 

 dence of use-inheritance — Weismann's statement. 



CHAPTER IV. 

 Basis of Investigation, Continued 74 



Origin of great men: — Sons of prominent men — Re- 

 lated to inferior men — Cromwell. 



Use and Disuse: — Biological meaning — Average use — 

 Normal use — Amount of use per ancestor — Functional 

 activity and time as the factors of use — Physical maturity 

 — Physical training — Physical disuse — Growth of brain — 

 Diagram, Fig. 2 — Growth of functional capacity extends 

 beyond physical growth — Mental capacity at different ages 

 — Hypothetical community — Diagram of body and brain 

 capacity, Fig. 3 — Formula for inheritance — Recapitulation 

 of second deduction from use-inheritance. 



CHAPTER V. 

 Standard of Comparison 83 



Hall of Fame: — Men chosen — Why especially ex- 

 amined. 



Formation of Standard Scale: — Tabulation from a 

 genealogy — Divisions of the scale, Table 1 — Extremes — 

 Birth-ranks — Sub-divisions of extremes of the scale. 



Scale Compared: — Records from Ireland, Scotland and 



