20 



CHARLES A. COBURN 



TABLE 7 

 Summary of Results for Second Generation Hybrids, F^, of Series A 



Average number tests, 

 Range of tests, 2-5 

 Average age in days: 



First 

 test, 42.00 



Last test, 99.21 



82F2a 

 Males 



4.45 

 First test. 



Average 1 and 2. . . 



Average all 



(79) 



Average 3, 4 and 5 



Last test 



Average number tests, 

 Range of tests, 2-5 

 Average age in days: 

 First test, 41.38 

 Last test, 99.27 



95 F2a females 



4.36 

 First test. 



Average 1 and 2 . 



Average all 



(94) 



Average 3, 4 and 5 . 



Last test 



Distribution of mice 

 in grades: 



Av. 



4.00 



3.67 



2.93 



2.31 

 2.10 



3.82 



3.76 



3.17 



2.70 

 2.64 



SAVAGENESS 



Distribution of mice 

 in grades; 



29 



12 



1 



1 

 1 



29 



23 



3 



2 

 3 



TABLE 8 

 Summary of Results for Third Generatio7i Hybrids, Fs, of Series A 



Average number tests. 

 Range of tests, 3-5 

 Average age in days : 



First 



test, 35.06 



Last test, 89.74 



62 Fsa 



Males 



Average number tests. 

 Range of tests, 3-5 

 Average age in days: 



First 

 test, 38.78 



Last test, 98.03 



52 Fsa 

 Females 



4.80 

 First test 



Average 1 and 2. . . 



Average all 



Average 3, 4 and 5 

 Last test 



4.98 

 First test. 



Average 1 and 2. . . 



Average all 



(50) 



Average 3, 4 and 5 



Last test 



WILDNESS 



Distribution of mice 

 in grades: 



Av. 



3.38 



3.30 

 3.07 

 3.08 

 2.69 



3.51 



3.54 



3.30 



3.15 

 2.92 



SAVAGENESS 



Distribution of mice 

 in grades: 



3.95 



3.66 

 2.99 

 2.69 

 2.48 



3.71 



3.60 



3.46 



3.37 

 2.96 



