16 



CHARLES A. COBURN 



but the remaining averages in these two generations of Series 

 B are in each case higher than those of Series A. The summary 

 of the tests for savageness in these two generations indicates 



TABLE 4 

 Summary of Results for the Three Generations of Series A 



Average number tests, 4.13 

 Range of 



tests, 2-5 First test 



Average age in days: 



First test Average 1 and 2 . . . 



31.22 

 Last test, 75.61 



Average all 



93 Fia (90) 



Males and Average, 3, 4 and 5 

 females 



Last test 



Average number tests, 4.40 

 Range of 



tests, 2-5 First test 



Average age in days: 



First test, Average 1 and 2 . . . 



41.66 

 Last test, 98.72 



Average all 



177 F2a (173) 



Males and Average 3, 4 and 5. 

 females 



Last test 



Average number tests, 4.88 

 Range of 



tests, 3-5 First test 



Average age in days: 



First test, Average 1 and 2 . . . 



36.76 

 Last test, 93.52 



Average all 



114 Fsa (114) 



Males and Average 3, 4 and 5. 

 females 



Last test 



WILDNESS 



Distribution of mice in 

 grades: 



Av. 1 2 3 4 5 



3.< 

 3.72 



3.31 

 2.92 



2.75 



3.90 



3.72 

 3.05 



2.52 

 2.39 



3.44 



3.41 

 3.23 



3.10 

 2.79 



SAVAGENESS 



Distribution of mice in 

 grades: 



Av. 1 2 3 4 S 



3.97 



3.58 

 2.96 

 2.38 

 2.04 



3.94 



3.46 

 2.64 



1.97 

 1.67 



3.63 

 3.26 



3.01 



2.78 



that the mice of Series B attained a higher average grade in 

 the first test and maintained a greater degree throughout all 

 the tests. Likewise the Fsb averaged higher grades in both 



