Till CONTEXTS 



XXV. Genetic Changes in Bisexual Reproduction ... 219 



XXVI. Inbreeding and Cross-Breeding 2-27 



XXVII. Hybrid A'igor or Heterosis 242 



XXVIII. Galton's Law of Ancestral Heredity and his Prin- 

 ciple of Regression 246 



XXIX. Sex Determination 248 



TART II. EUGENICS 



XXX. Human Crosses 20.5 



XXXI. Physical and Mental Inheritance in Man ... 271 

 XXXII. Heredity of General Mental Ability', Insanity. 



Epilepsy', and Feeble-Mindedness 279 



XXXIII. The Possibility' and Prospects of Breeding a Better 



Human Race C92 



APPENDIX. Translation of Mendel's Paper, Experiments 



IN Pl.\nt-Hybridisation 313 



BIBLIOGRAPHY 355 



INDEX 391 



