660 



THE AMERICAN NATURALIST 



[Vol. XLIV 



spring 24 per cent, of the known grandparents are re- 

 corded as blond or fair, whereas in families without 

 blond offspring only 13 per cent, of the known grand- 

 parents are blond or fair. In families with blond off- 

 spring 9 of the 34 complete sets of grandparents (or 

 26.5 per cent.) show blondness on both the paternal and 

 maternal side, whereas in families without blond off- 

 spring, of the 36 complete sets of grandparents only 4, 

 or 11 per cent., show blondness on both sides, and the size 

 of the families in these four cases is small, viz., 2, 2, 2, 

 4, so that there is a large chance that the families are 

 potentially blond producing and really belong in with 

 the blond producing families. It appears, then, that 

 both the intermediate and brunet parents may contain 

 hypostatic blondness, and where they do they will have 

 blond offspring, but not otherwise. 



If the brunet parent is, in any case, duplex-brunet and 

 contains no hypostatic intermediate or blond then ex- 



