No. 527] 



SKIN PIGMENTATION IN MAN 



649 



given in Table II, and are divided into two classes, viz., 

 those containing blond offspring, on the left side of the 

 table, and those containing none, on the right side. The 

 division is made in accordance with the hypothesis that 

 "brunet" is dominant to "blond" and that the brunets 

 may be of two sorts, either duplex or simplex, in respect 

 to the pigmentation character. If the pigmentation fac- 

 tor of the dark parent is duplex no blonds are to be ex- 

 pected, but if the dark parent is simplex in pigmentation 

 half of the children will have little or no black skin-pig- 

 ment. By hypothesis the simplex parents should be 

 about twice as numerous as the duplex. In Table II 

 there are 70 families with blond children to 18 without 



