INHERITANCE OF DIGITAL MALFORMATIONS IN MAN. 75 



thirty-six abnormal, distributed as follows : in the second gen- 

 eration, four normals and four abnormals; in the third, five 

 normals and seven abnormals; in the fourth, seven normals and 

 nine abnormals; and in the fifth, seventeen normals and sixteen 

 abnormals. 



TABLE IV. 

 Sex Relations. 







SEX OF 



NUMBER 



NORMAL 



ABNORMAL 



GENE- 



ABNORMAL 



OF 











RATION. 



PARENTS. OFFSPRING. 



MALE. FEMALE. 



MALE 



FEMALE. 



I 





? 



? 









1 



II 



1 



female 



11* 



4 



0 



1 



3 



III 





male 



12 



2 



3 



3 



4 



IV 



(f 



males 



4 



0 



1 



0 



3 





females 



12 



1 



5 



3 



3 



V 





males 



17 



4 



4 



4 



5 



1^ 



females 



16 



6 



3 



4 



3 



Table iv shows that the abnormality is inherited through 

 both sexes. Six abnormal male parents have twelve males, 

 six normal and six abnormal, and twenty-one females, eight 

 normal and thirteen abnormal; while eight abnormal female 

 parents have nineteen males, eleven normal and eight abnormal, 

 and seventeen females, eight normal and nine abnormal. Of 

 the descendants of the six males, fifty percent of the males 

 and sixty-two percent of the females are abnormal ; while, among 

 the descendants of the eight abnormal females, only forty-twx3 

 percent of the males and fifty-three percent^of the females 

 are abnormal. Fifty-eight percent of all the descendants of 

 males are abnormal, whereas only forty-seven percent of the 

 descendants of females are abnormal. There are five and a half 

 times as many offspring as abnormal male parents and only four 

 and a half times as many offspring as abnormal female parents. 

 Forty-five percent of all descendants are males and fifty-five 

 percent, females. Yet the whole number of abnormal males 



*Three are unknown. 



