Xll 



CONTENTS 



CHAPTER 



XVI. The Chromosome Theory of Heredity 

 XVII. Genes and Characters 

 XVIII. The Determination of Sex . 

 XIX. The Practical Value of Genetics 

 XX. Heredity in Man .... 

 XXI. Eugenics . . . „ . 



PAGE 



289 

 305 

 325 

 341 

 359 

 374 



C. Theories of Evolution 



XXII. Natural Selection .... 



XXIII. Other Theories of Germinal Selection 



XXIV. The Lamarckian Theory 



XXV. Evolution Today ..... 



Index 



385 

 401 

 413 



427 



445 



