42 



CHARLES A. COBURN 



From this table it is readily seen that the mice of Series A, 

 tame female by wild male, became generally less wild and less 

 savage in succeeding generations according to the averages 

 of all the tests and the averages of the third, fourth, and fifth 

 tests, the only exception being the average of all the tests for 

 savageness of the F2 hybrids, which grade is greater than the 



TABLE 28 



Summary of Results of First Generation Hybrids, Fi, of Series B, from Matings of Parental 

 Generation, Wild Female with Tame Male 



Average number tests, 

 Range of tests, 4—5 

 Average age in days: 

 First test, 39.76 

 Last test, 104.52 



26 Fib Males 

 and Females 



Average number tests, 

 Range of tests, 4—5 

 Average age in days: 

 First test, 37.70 

 Last test, 101.88 



17 Fib 

 Males 



Average number tests. 

 Range of tests, 4—5 

 Average age in days : 

 First test, 32.77 

 Last test, 107.48 



9 Fib Females 



4.65 

 First test . 



Average 1 and 2. . 



Average all 



Average 3, 4 and 



5 



Last test 



4.53 

 First test . 



Average 1 and 2. . 



Average all 



Average 3, 4 and 



5 



Last test 



First test 



Average 1 and 2 . . 



Average all 



Average 3, 4 and 



5 



Last test 



Distribution of mice 

 in grades: 



Av. 1 2 3 4 



3.76 

 3.61 



3.35 



3.16 

 3.22 



3.71 



3.14 



2.93 



2.74 

 2.76 



3 



4.44 



4.09 



3.84 

 4.11 



SAVAGENESS 



Distribution of mice 

 in grades: 



Av. 1 



4.07 

 3.94 



3.25 



2.73 

 2.47 



3.88 



3.73 



2.93 



2.3 

 1.44 



4.44 



4.33 



3.81 



3.46 

 3.62 



like average of the Fi or the F3. The females of this series 

 were, as a rule, more savage than the males, and were also more 

 wild in the first and second generations, the males grading 

 higher in wildness in the third generation. 



The results of the crosses of Series B, tame female by wild 

 male, are directly opposed to those of Series A, the mice in this 



