50 



CHARLES A. COBURN 



and non-savage. The number of mice which were consid- 

 ered wild is found by adding the number of wild and savage 

 and the number of wild and non-savage found in the first divi- 

 sion of the table. Likewise the total number of tame mice is 

 the sum of the tame-savage and the tame-non-savage. The 



TABLE 36 



Summary of Results of Third Generation Hybrids, F^, of Series B, from Matings of Parental 

 Generation, Wild Female with Tame Male 



Average number tests, 4.64 



Range of tests, 3-5 First test 



Average age in days: 



First test, 42.35 Average 1 and 2 

 Last test, 82.63 



Average all ... . 

 14 Fsb Males Average' 3, 4 and 



and Females 5 



Last test 



Average number tests, 4.54 



Range of tests, 3-5 First test 



Average age in days : 



First test, 42.09 Average 1 and 2 

 Last test, 76.0 



Average all ... . 

 1 1 Fsb Average 3, 4 and 



Males 5." 



Last test 



Average number tests, 5 



Range of tests, 5 First test 



Average age in days: 



First test, 34. Average 1 and 2 



Last test, 100.33 



Average all 



3 Fab Average 3, 4 and 



Females 5 



Last test 



sum of the wild-savage and the tame-savage equals the total 

 number which were savage, while the sum of the wild and non- 

 savage mice and the tame and non-savage gives the number 

 which were non-savage. In the second column are given the 

 percentages which indicate what part of the total number of 

 mice are the various numbers. The third and fourth column 



