xiv CONTENTS 



CHAPTER PAGE 



7. The control of defects 235 



8. Inbreeding 238 



9. Experiments to test the effects of inbreeding . . 240 



10. The influence of proximity 241 



11. Inbreeding in the light of Mendelism . . . 242 



XII. HUMAN CONSERVATION. 



1. How mankind may be improved .... 244 



2. More facts needed 245 



3. More application of what we know necessary . . 247 



4. The restriction of undesirable germplasm through 



a. The control of immigration .... 248 



6. More discriminating marriage laws . . . 250 



c. An educated sentiment 251 



d. The segregation of defectives .... 252 



e. Drastic measures 254 



5. The conservation of desirable germplasm . . . 255 



a. By subsidizing the fit 256 



b. By enlarging individual opportunity . . 258 



c. By preventing germinal waste .... 258 



1. Preventable death 258 



2. Social hindrances 259 



6. Who shall sit in judgment ? 260 



XIII. BIBLIOGRAPHY 263 



XTV. INDEX . 265 



