SUPPRESSED EFFECTS 47 



Since X and Z belong to more than half the groups, 

 the differentiating characters in the set are Y and y, 

 and C and c ; and, since three of the combinations 

 which these four characters can form are already 

 claimed, the only combination left for the last group in 

 the set is XyZc. If the characters common to all four 

 groups be neglected, those with which we are at present 

 concerned are : 



But were two such albinos found among the thirty 

 hybrids' progeny, or, since similar individuals must be 

 produced again, among subsequent generations of the 

 hybrids' descendants when mated among themselves or 

 with the original parents ? 



This question could be answered by mating the 

 albinos so produced with all the possible varieties of 

 black and grey and observing the progeny at each 

 different kind of mating. Of the albinos themselves, 

 there should be three different kinds, namely : 



Albino No. 1, pure in Y, and of the constitution * Yc 



Yc 



Albino No. 1, hybrid in Y, and of the constitution Yc 



yc 



Albino No. 2, pure, and of the constitution y c 



yc 



* When we speak of an individual's constitution we refer to the 

 factors it carries. 



