178 



BIOLOGY OF DEATH 



degrading environmental conditions, or economic want 

 can liave influenced the results. These data were com- 



et: 

 1^ 



§ 



50 



4S 



40 



35 



30 



Z5 



20 



15 



10 



MOTHER /WO CHILDREN 

 FATHER AND CHILDREN 



16 26 36 46 56 66 76 



AGE AT DEATH OF PARENTS 



86 and c 



Tia. 44. — Diagram showing the influence of age at death of parents upon the percentage of 

 offspring dying under 5 years. (After Floetz). 



pUed by the well-known German eugenist, Professor 

 Ploetz of Munich, The lines show the falling per- 



