No. 635] WHITE SPOTTING IN MICE 471 



closeness with which. the numbers of piebalds resulting 

 from various crosses (Table II) agree with the numbers 

 expected on the assumption that the gene s segregates 

 at random with regard to 8, W, and w. It is certain, 



nevertheless, that all possible variations of piebald have 

 not been met with in the distributions presented in Table 

 II and Fig. 2. Little (1917) bred a race of pure piebalds 

 which varied from 100 per cent, to 64 per cent, white dor- 

 sally. These piebalds are entirely outside the range of 

 the piebalds bred in the present experiments. Moreover, 



