54 



CHARLES A. COBURN 



their parents lessens the value of each group, as far as mere 

 numbers are concerned, in proportion as the numbers compris- 

 ing each group are lessened. In this case, however, the loss 

 seems to be more than counteracted by the value of the demon- 

 strated tendency that a difference in the grade of wildness and 

 savageness of the hybrid parents seems to make some, though 



TABLE 40 



not a striking difference, in the grade of wildness and savage- 

 ness of the offspring. If the results given in table 40 are con- 

 sidered, it would seem fairly reasonable to expect more of the 

 mice from Mating I. ( 9 W-S X cf W-S) to be wild and savage 

 than tame and non-savage since the parents both graded wild 

 and savage. This seems to be the case, at least to some ex- 

 tent, since the percentage of wald mice and the percentage of 



