26 



CHARLES A. COBURN 



results of the first five tests are essentially the same as those 

 given for the F2a'sin tables 4 and 7, showing that these 17 indi- 

 viduals were normal. The significance of the table is merely 



TABLE 15 



Summary of Results for Seventeen Individuals of Second Generation Hybrids, Series A 

 when the number of Tests is increased to Eight 



Average number tests, 8 

 Range of tests, 8 

 Average age in days: 

 First test, 57.88 



Fifth test, 121.82 

 Eighth test, 167.82 

 17 Foa males and 

 females 



Average number tests, 8 

 Range of tests, 8 

 Average age in days: 

 First test, 57.54 

 Fifth test, 121.77 

 Eighth test, 167.77 

 7 F2a Males 



First test . 



Average 1 

 and 2. . . 



Average first 5 

 Average 3,4, 



and 5 



Fifth test 



Average 6, 7, 



and 8 



Eighth test 



Average number tests, 8 

 Range of tests, 8 

 Average age in days: 

 First test, 57.92 

 Fifth test, 121.98 

 Eighth test, 167.97 

 10 Foa females 



First test 



Average 1 and 2 



Average first 5 

 Average 3, 



4 and 5 



Fifth test 



Average 6, 



7 and 8 



Eighth test . . . . 



First test 



Average 1 and 2 



Average first 5 . 

 Average 3, 



4 and 5 



Fifth test 



Average 6, 



7 and 8 



Eighth test 



Distribution of mice 

 in grades: 



Av. 1 



3.29 



3.52 



3.06 



2.74 

 2.82 



1.64 

 1.47 



3.58 



3.57 



2.19 



2.30 

 1.85 



1.22 

 1.00 



3.10 

 3.50 



2.82 



3.06 

 3.60 



2.13 

 2.10 



SAVAGENESS 



Distribution of mice 

 in grades: 



Av. 1 



3.38 



2.59 



2.00 

 2.00 



1.30 

 1.00 



4.33 



3.47 



1.39 



1.30 

 1.14 



0.40 

 0.42 



3.70 



3.60 



2.60 



2.56 

 2.60 



1.96 

 1.40 



to show that the decrease in the grades of wildness and savage- 

 ness continues with the successive tests when the number of 

 tests is increased to eight. 



