CONTENTS 
CHAPTER PAGE 
I. An INTRODUCTORY ORIENTATION... 0.00... c cece eee eee I 
II, THe HEREDITARY BASIS... .....0000.00 000 cece cece eee eee ee II 
III. Tue INHERITANCE OF MENTAL DEFECTS AND DISEASE........ 27 
IV. THE HERITABLE Basis OF CRIME AND DELINQUENCY.......... 73 
V. THE INHERITANCE OF MENTAL ABILITY..............-.00005 98 
VI. THe DECLINE OF THE BirtH RaTE...............0000..0000. 118 
VII. Tue CAvusES OF THE DECLINE OF THE BirTH RATE........... 143 
VIII. NATURAL SELECTION IN MAN. .......... 00 0c cece ee eee 181 
IX. THE SELECTIVE INFLUENCE OF WAR..... 200.0000 cece eeeeee 205 
X. SEXUAL SELECTION AND ASSORTATIVE MATING............... 222 
XI. ConsaANGUINEOUS MARRIAGES AND MISCEGENATION........... 238 
XII. Tue Possrprte ROLE oF ALCOHOL AND Disease IN CAUSING 
HEREDITARY DEFECTS’: 3.55204 82 eee thee ebm ba ee R HERE Oe 269 
XIII. THE ALLEGED INFLUENCE OF ORDER OF BIRTH AND AGE OF 
PARENTS UPON OFFSPRING....... 0.00 e tenes 207 
XIV. Tue Ractat INFLUENCE OF INDUSTRIAL DEVELOPMENT........ 325 
XV. THE SELECTIVE FUNCTION OF RELIGION............0 0000000. 355 
XVI. RETROSPECT AND PROSPECT... 1. cece eee cece eee ees 364 
