The Study of Human Heredity. 



15 



Plate IV. 

 Hypothetical pedigree, illustrating use of symbols. 



'Q-.-K> 



II 



d. 65 



m 



-^ 



1-60 



'a 



-i-Srn-Tfr^ '.Tr^'':?! 



n 



o 



□ 



IV 



D 



inoeat 



I 



i 





;t ^^ '^, ^ 1 'dSi 



d-18 



typhoid 



fever • 



b-189o b- b-1893 

 1891 



Alms Bouea. 



