RESULTS. 



25 



N 8.i per cent and the females of 13.3 per cent. Of children of one 

 year old and under two, the males average N 19.5 per cent and the 

 females N 24.8 per cent. In the following years the male pigmentation 

 catches up with that of the female. 



VIII. Do THE CHILDREN "TAKE AFTER" THE MOTHER AND FATHER 



EQUALLY ? 



To answer this question table 26 was drawn up. In this table is 

 given the distribution into classes of the offspring of reciprocal crosses. 



TABLE 26. Frequency of each class of the offspring of reciprocal crosses. 



The excess in the average number of factors in the children when 

 the mother is the darker is probably without biological significance 

 and is due largely to the circumstance that there are more children 

 (because more matings) from mothers that are much darker than 

 fathers than the reverse; and this tends to overweight the darkness 

 of the progeny from matings in which the mother is the darker. If 

 the reciprocal matings of tables 16 and 24 be omitted altogether the 

 average number of factors in the children of darker mothers falls to 

 1.03, while that of children of darker fathers is i.oi. The determiners 

 of skin color carried in the egg and those carried in the sperm are alike. 



IX. SELECTION OF MATES. "GRADING UP" TO WHITE. 



Our studies throw light on the question of selection of mates by 

 persons of "colored" blood, for we have in our studies 93 matings of 

 persons whose skin color has been quantitatively determined. It 

 appears that of these 93, in 65 the mother is the darker and in 28 the 

 father is the darker. That is, light men mate with and are accepted 

 by darker-skinned women; but more rarely does a dark-skinned man 

 select (or become accepted by) a lighter-skinned woman. It will be 



