PLATE 2. 



FIG. 4. Part of the G. and O. family, pedigree 21, including a medium-colored 

 man [I i(MF), brother to Fig. 3, I 3(F)], his light-colored wife 

 I I (MM), five of their eight children and the light-colored child of 

 one of them, .., of II 5(M). 



FIG. 5. Part of the B. family, pedigree 25, including a light-colored man, 

 I 2(F), and his light wife, I 2(M), and three of their four children. 



FIG. 6. Part of the B. family, pedigree 25, including a practically white 

 father, I i(F), light-colored mother and their three children. 



