HEREDITY IN THE CASE OF DEMENTIA PRÆCOX AND RELATED DISEASES 117 
no means rare, though it is only exceptionally that they can be followed 
through so many generations; along this way also we come no further 
NE GS 1—12 Danish kings 
13—15 Swedish » 
16—22 English » (queen) 
23—31 Prussian » 
32—34 Bavarian » 
35—38 German dukes 
35 Duke William the Pious 
4 King Frederik III 
8 » Frederik V 
9 » Christian VII 
13 » Adolf Fredrik 
14 » Gustaf III 
15 » Gustaf 1V Adolf 
33 » Ludwig II 
34 » Otto I 
; 
En 
ND 
than to a fairly certain proof that at least one of the factors, which con: 
dition Dementia præcox, must be recessive. 
