THE INHERITANCE OF FAMILY TRAITS 10.5 



severe form, repeated attacks of inflammation of the heart 

 and pains in joints with formation of nodules beneath the 

 skin. Finally the girl died a victim to extreme, uncontrol- 

 lable rheumatism and chorea. 



The exact laws of inheritance in these cases are not clear 

 and eugenic instruction cannot be drawn from them. 



IE 



an; 





51 6l 7| 81 

 no chorea -^ 



iiSi 



Fig. 69. — Pedigree of family showing chorea and rheumatism. ~ I, choreic 

 at 15 years; still has slight twitchings; II, 2, is not choreic but is subject to 

 migraine and has had several attacks of rheumatism. He haa had 2 daugh- 

 ters and 2 sons. Ill, 1, is 18 years old and since her eighth year hjis had 

 chronic and severe chorea; at 12 she had an attack of rheumatism and since 

 then attacks of rheumatism and chorea have alternated. Her elder brother, 

 16 years of age, was attacked a year before by chorea which l:isted 2 months; 

 recently has had another attack preceded by rheumatic pains. The third 

 child, III, 3, now 13 years old, has had no rhematism but was first attacked 

 by chorea at 12 and has had other attacks since. The youngest, III, 4, now 

 11, had a first attack of chorea at 8 years, lasting 2 months; a second attack at 

 10 and a third recently; in his eighth year he had articular rheumatism. 

 Apert, 1907, p. 235. 



26. Speech-defects 



Wliile the minor speech defects of stammering, stuttering, 

 lolling, lisping and poltering correspond to no yet recognized 

 abnormality of the central nervous system or organs of 

 articulation, nevertheless, aside from imitation, they clearly 

 have an hereditary basis and while the slighter grades may 

 be cured by practice the more profound disturbances remain 

 a permanent affliction. Especially are these defects found 

 in children of a neuropathic inheritance and, in such, yield 

 the strongest evidence of inheritance. 



The exact method of inheritance of stuttering will not 



