30 



CHARLES A. COBURN 



Mice from Fib were next used in this study. 14 individuals 

 comprised Group 1 and 16 Group 2. The results are given 

 in tables 18 and 19. From F2b four groups were used. The 

 mice forming two of these groups were very much younger than 

 those comprising the other two groups of Fob and also the two 



TABLE 18 



Summary of Results of Group 1, First Generation Hybrids, Fi, of Series B, Tested at the 



Usual Times 



Average number tests, 5 



Range of tests, 5 First test 



Average age in days: 

 First 



test, 52.00 Average 1 and 2 . . 



Last test, 82.28 



Average all 



14 Fib males 



and females Average 3, 4 and 5 

 Last test 



Average number tests, 5 



Range of tests, 5 First test 



Average age in days: 

 First 



test, 36.00 Average 1 and 2 . . 



Last test, 66 



Average all 



3 Fib Males Average 3, 4 and 5 

 Last test 



Average number tests, 5 



Range of tests, 5 First test 



Average age in days: 

 First 



test, 56.36 Average 1 and 2 . . 



Last test, 86.76 



Average all 



11 Fib females Average 3, 4 and 5 

 Last test 



Distribution of mice 

 in grades: 



Av. 



4.14 



4.35 



4.05 



3.88 

 4.07 



4.35 



4.66 



4.26 

 4.0 



4.33 



4.09 



4.22 



4.0 



3.84 



4.0 



SAVAGENESS 



Distribution of mice 

 in grades: 



Av. 1 



4.57 



4.53 



3.94 



3.54 

 3.21 



4.33 



4.66 



3 



3.22 



3.0 



4.63 



4.50 



3.98 

 3.63 

 3.27 



groups of Fib. There were 37 of these younger mice, 19 in Group 

 1 and 18 in Group 2. The results are presented in tables 20 

 and 21. Group 1 of the older mice contained 17 individuals, 

 while 19 mice comprised Group 2. The results of the tests of 

 these are given in tables 22 and 23. 



