Davenport and Weeks : Inheritance oe Epilepsy 



15 



a defective. When the defective parent is feeble-minded, out of 

 17 known offspring 7 are normal ; and when the defective parent 

 is epileptic, out of 35 children 16 are normal (Figs. 21, 22, 23). 

 In each case the normals are slightly fewer than the expected 50 

 percent, doubtless because some of the simplex offspring are neu- 



(Ti ^ (Ni ® ^)-j-^ 6 6^(^6 D 



, 3 5 6 24 ®^ 



6^6 6 I k 



Fig. 22. This is the history of a family of intelligent people where 

 there are many consanguineous marriages. Some fraternities consist 

 wholly of normal persons but there are twelve fraternities containing one 

 or more epileptic or mentally defective persons. An epileptic woman 

 marries into one of the " wholly normal " fraternities and has two epileptic 

 and four neurotic children. Case 2207. 



D-pO 



6o<dis®bl6 



5^-r-65a 



Fig. 23. A normal woman (who has an epileptic sister and an epi- 

 leptic niece) marries an alcoholic man and has two normal children ; but 

 later, after she marries an epileptic man, there are reared one normal, one 

 neurotic and one epileptic child. Case 2819. 



rotic. Similarly with the normal X "insane" matings (Fig. 24). 

 Now, by hypothesis, such matings should produce all normal (or 

 neurotic) offspring unless in every case the normal parent is sim- 

 plex and forms defective germ cells. We look therefore with 

 interest at the condition of the famiHes of these normal parents. 



