534 



THE AMERICAN NATURALIST [Vol. XLV 



84 straight-haired to 24 curly-haired Filipinos of the 

 Primitive type. 6 



To compare the results obtained from the previous 

 records they may be assembled in one table. 



TABLE VI 



Straight • straiifli 

 Kinky X straight. 

 Total 



Three classes may be segregated, taking the relative 

 proportions of curly hair alone. In the first class neither 

 parent shows the dominant character and 100 per cent, of 

 the children have curly hair, which would he anticipated 

 from Mendelian crosses of R X R. In the second class 

 only one parent shows the dominant character and the 

 curly-haired children constitute approximately 50 per 

 cent.— curly x wavy 78 per cent, and curly X straight 34 

 per cent.— which would be anticipated from Mendelian 

 crosses of RxDR. In the third class both parents show 

 the dominant factor and the curly-haired children con- 

 stitute approximately 25 per cent. — straight X straight 12 

 per cent., wavy X straight 20 per cent., wavy X wavy 40 

 per cent., which is to be expected from DRxDR matings. 

 The proportions are not exactly those to be expected if 

 the straight hair is dominant, due no doubt to the small 

 number of individuals observed, but a tendency towards 

 dominance on the part of straight hair and recessiveness 

 on the part of curly hair is to be noted. Some discord- 



pp. 27-53. j 



