RESULTS. 



15 



VI. Test of the Hypothesis. 



To test the hypothesis we must take up in order the matings of 

 various grades of skin color and consider their offspring. 



Table 8. — Both parents of class o-g; gametes without factor for negro X. 



Table 8a. — Mother's gametes probably without factor for N; father " passes for white;" half 



of his gametes may contain i factor for N. 



•Total blind. 

 Table 9. — Father without factor for negro N, mother with i factor for negro N. 



" Placed here partly because proportion of white in her skin color formula is low (33 per cent), partly 

 because of origin, and partly because of the skin color of her progeny. 



