HEREDITY OF WILDNESS AND SAVAGENESS IN MICE 67 



in the lowering of the grade of wildness and savageness in 

 the hybrids. 



8. The hybrids of Series A from the matings of parental 

 generation tame female with wild male became generally less 

 wild and less savage in the succeeding generations, while the 

 hybrids of Series B of this mating attained an increasingly 

 higher average grade of wildness and savageness in the suc- 

 cessive generations. The females of both series from this mating 

 were more wild and savage in the first and second generations 

 and the females of Series A more savage in the third generation 

 than the males, the males of both series being more wild than 

 the females in the third generation, while the males of Series 

 B were also more savage than the females in this generation. 



9. The average grades attained in wildness and savageness 

 in the first generation hybrids of both series, from matings 

 of parental generation wild female with tame male, were, as a 

 rule, lowered in the second generation and then, in the third 

 generation, raised almost to the height of the grades obtained 

 in the first. The grades received by the females of both series 

 from this mating are in excess of those obtained by the males 

 except in the case of the males of Series A, which graded higher 

 in wildness in the first generation and higher in savageness in 

 the third generation than the females of Series A. 



10. Under the conditions existing in this study it is very 

 doubtful whether there was much, if any, difference in the 

 inheritance of wildness and savageness by the hybrids due to 

 the fact that one type of parental mating was wild female and 

 tame male and the other, tame female and wild male. 



11. When the individual mice are separated into the four 

 classes; wild-savage, wild-non-savage, tame-savage, tame-non- 

 savage, according to the average of the third, fourth and fifth 

 tests for wildness or savageness being equal to or above 2.5 

 grade or below this, the wild and savage class, as a rule, rep- 

 resented the greatest number of mice, the wild and non-savage 

 class the next highest, the tame and non-savage the next, and 

 the tame and savage class the least number. The one excep- 

 tion to this is in the second generation hybrids of Series A, for 

 which the order was as follows: (1) tame-non-savage, (2) 

 wild-savage, (3) wild-non-savage, (4) tame-savage, where 1 

 represents the greatest number of mice and 4 the lowest. 



