SUPPRESSED EFFECTS 51 



When C is present with the other factors which produce 

 either colour, tlie rabbit is grey or black, as the case 

 may be, while, when C's place is taken by c, its recessive, 

 the rabbits are albinos. Thus the pair C and c are 

 concerned with colour : C being concurrent with its 

 production — whether grey, black, or, presumably, any 

 other colour — and c with its non-production. 



Now that the four pairs of characters, X and x, 

 Y and y, Z and z, C and c, have been shown to combine 

 in producing rabbit colours, it will be instructive to set 

 down all the possible combinations these four pairs of 

 characters can form, together with the colours belonging 

 to each. It will be noticed that six more albinos are 

 possible ; and, since the substitution of C for c makes 

 a definite colour of what would otherwise be an albino, 

 we may speak of each albino as carrying the factors for 

 the colours which the substitution produces, thus : 



Albino carrying pale tortoise- shell xyzc 



