162 HEREDITY IN RELATION TO EUGENICS 



children of whom one died at 5 months from congenital 

 heart disease. In the case of Schmaltz, that of a seven year 

 old boy, the father and father's mother had heart defect. 

 Af—i The patient of Potocki who, 29 years old, 



died of brain abscess and had a pulmo- 

 I T I . nary stenosis with closed septum and 



w w ■tO defect of the interauricular septum, de- 

 I scended from a mother with a congenital 



J I 1 heart disease. Rezek observed 8 cases of 

 w W heart disease in 4 generations of one f am- 

 FiG. 138.— Pedigree ily, including 2 congenital defects; the 

 s°oreome^mauS "^o^her probably having got her heart 

 one affected parent, disease from the grandmother (Fig. 140). 

 Two sisters afflicted with ichthyosis con- 

 genita, descended, according to Leuch's report, from a mother 

 who suffered from a defect of the bicuspid valve; the oldest 



I °^ 



IE i l al 3I il 



Fig. 139. — Pedigree of a family showing heavy incidence of exophthahnic 

 goitre. Ill, 1, 2, 3, also affected; sex unknown. 



child, the son, had also congenital heart disease. . . , Eger 

 found in 12 cases of congenital heart disease, three times 

 lues patris as well as consanguinity of the parents." To 

 these cases it would be possible to add almost indefinitely. 

 ''Heart disease" is very common, but it does not fall upon 

 individuals at random, but prevailingly upon strains with an 

 inherent hability or weakness (Figs. 140-143). 



b. Arteriosclerosis, — ^While degeneration of the wall of the 



