HEREDITY OF WILDNESS AND SAVAGENESS IN MICE 



39 



males and from tame females crossed with wild males. For 

 the same reason both parents were allowed to remain, with 

 few exceptions, in the cage with the young until they were 

 weaned. It is proposed, in this section of the paper, to present 

 for closer consideration groups of hybrid individuals of the 



TABLE 25 



Summary of Results of First Generation Hybrids, Fi, of Series A,fromMatings of Parental 

 Generation, Tame Female with Wild Male 



Average number tests, 4.06 

 Range of tests, 3-5 First test 



Average age in days: 



First test, 43.14 



Last test, 63.0 



Average 1 and 2. 



45 Fia Males 

 and Females 



Average all 



Average 3, 4 and 



5 



Last test 



Average number tests, 4.17 

 Range of tests, 3-5 First test 



Average age in days: 



First test, 32.11 Average 1 and 2. 

 Last test, 56.2 



Average all 



17 Fia Average 3, 4 and 



^lales 5 



Last test 



Average number tests 4.0 



Range of tests, 3-5 

 Average age in days: 

 First test, 49.85 

 Last test, 67.25 



28 Fia 

 Females 



First test . 



Average 1 and 2. . 



Average all 



Average 3, 4 and 



5 



Last test 



Distribution of mice 

 in grades: 



Av. 1 



4.02 



3.61 



3.15 



2.70 

 2.44 



3. 



3.47 



2.87 



2.32 

 2.29 



4.10 

 3.69 

 3.33 



2.96 



2.53 



SAVAGENESS 



Distribution of mice 

 in grades: 



Av. 1 



4.04 



3.55 



2.79 



2.06 

 1.75 



4.0 



3.61 



2.80 



2.05 

 1.2 



4.07 



3.51 



2.79 



2.07 

 1.25 



17 



10 



710 



first, second and third generations obtained from a cross of 

 wild females with tame males and other groups obtained from a 

 cross of tame females with wild males. In most cases the individ- 

 uals of the F2 were offspring of the Fi mice represented in the 

 tables, likewise most of the F3 mice were obtained from 

 matings of the F2. 



