THE INHERITANCE OF FAMILY TRAITS 141 



(1883) records the case of a woman who never had teeth 

 nor hair. Her sister was normal but her son was edentulous, 

 and hairless. The sister (by an undescribed consort) had 

 18 children who grew up. Of these, one is edentulous while 

 some of the others have failed to erupt all of their teeth. 



I 



II 



u% 



*jfa 



\I 





Fig. 115. — Pedigree of a family with peculiarities of hair and nails. I, 2, 

 wtfe of PiRouT, poorly nourished nailg Aud hair; II, 1 wife of Quimbel, horn 

 Rouen, 1775, poorly nourished nailg APd hajr; III, 2, mar. Delaf, bald with 

 bad nails; III, 4, bald, bad nails; JII, 5, Pelatj, bald, bad nails; III, 7, bald, 

 bad nails; III, 9, bald, bad nail?; IV, 1, bad nails; IV, 3, bald and bad nails; 

 IV, 4, chestnut hair, bad nai^a; IV, 5, bald and bad nails; IV, 7, stands for 

 5 boys who were bald and lywj bad nails; IV, 8, a girl who is bald and has 

 bad nails; IV, 9, rachitic i^ childhood, bad hair and nails; IV, 11, bad nails 

 and hair; IV, 15, bad najl? a?id hair; V, 1, had bad nails and hair, he died in- 

 sane but his brother was normal. Of the children of IV, 5, 6, three had bad 

 nails and hair, four (V, 7) were bald as well and nine others were normal. Of 

 the children of IV, 11, 12, two had bad nails and hair. Of the children of 

 IV, 15, 16, two ha4 t>^d nails and hair and there were three granddaughters 

 similarly affected- Nicoll^ et Halipre, 1895. 



The edentulous son married a normal (?) woman and had 

 eight chil<iFen. One, 14 years of age, who was examined, 

 had many teeth undeveloped; another, at 16 years of age, 

 had only 14 teeth when 28 were to be expected. Further 

 data are necessary to determine whether or not imperfect 

 development of the dental arcade is due to a genuine defect 

 in the germ plasm. 



